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Regressions in System.Text.Json.Tests.Perf_Reader #82107

Closed
performanceautofiler bot opened this issue Feb 14, 2023 · 4 comments
Closed

Regressions in System.Text.Json.Tests.Perf_Reader #82107

performanceautofiler bot opened this issue Feb 14, 2023 · 4 comments
Assignees
@radekdoulik
Labels
area-System.Text.Json tenet-performance Performance related issue tenet-performance-benchmarks Issue from performance benchmark
Milestone
8.0.0

Comments

@performanceautofiler
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Run Information

Architecture x64
OS Windows 10.0.18362
Baseline 59dddfdef247b9b85a69d663a1d1c1746206711e
Compare 081d93a5e8817d47e660a38404c08364c286172f
Diff Diff

Regressions in System.Text.Json.Tests.Perf_Reader

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio Baseline ETL Compare ETL
ReadReturnBytes - Duration of single invocation 1.63 μs 1.81 μs 1.11 0.03 False Trace Trace

graph
Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Payloads

Baseline
Compare

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Reader*'

Payloads

Baseline
Compare

Histogram

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: True, TestCase: LotsOfStrings)

Description of detection logic

IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 1.8132940036377063 > 1.6728543734938812.
IsChangePoint: Marked as a change because one of 2/8/2023 6:12:15 AM, 2/14/2023 2:39:38 AM falls between 2/4/2023 10:21:07 PM and 2/14/2023 2:39:38 AM.
IsRegressionStdDev: Marked as regression because -40.54798471062194 (T) = (0 -1824.8238399658435) / Math.Sqrt((457.4417773191006 / (34)) + (635.9433397879968 / (27))) is less than -2.000995378087428 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (34) + (27) - 2, .025) and -0.15630228651064987 = (1578.1546583917755 - 1824.8238399658435) / 1578.1546583917755 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```### Baseline Jit Disasm

```assembly
; System.Text.Json.Tests.Perf_Reader.ReadReturnBytes()
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,128
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqa   xmmword ptr [rsp+20],xmm4
       mov       rax,0FFFFFFFFFFFFFF10
M00_L00:
       vmovdqa   xmmword ptr [rsp+rax+120],xmm4
       vmovdqa   xmmword ptr [rsp+rax+130],xmm4
       vmovdqa   xmmword ptr [rsp+rax+140],xmm4
       add       rax,30
       jne       short M00_L00
       mov       [rsp+120],rax
       mov       rsi,rcx
M00_L01:
       mov       rdx,[rsi+18]
       test      rdx,rdx
       je        near ptr M00_L14
       lea       rdi,[rdx+10]
       mov       ebx,[rdx+8]
M00_L02:
       mov       rdx,[rsi+10]
       test      rdx,rdx
       je        short M00_L04
       lea       rcx,[rdx+10]
       mov       r9d,[rdx+8]
M00_L03:
       xor       edx,edx
       mov       [rsp+30],rdx
       mov       [rsp+38],rdx
       mov       byte ptr [rsp+40],0
       mov       byte ptr [rsp+41],0
       mov       byte ptr [rsp+42],0
       mov       byte ptr [rsp+43],0
       mov       byte ptr [rsp+44],0
       mov       byte ptr [rsp+45],0
       mov       [rsp+48],rdx
       vxorps    xmm0,xmm0,xmm0
       vmovdqu   xmmword ptr [rsp+50],xmm0
       mov       [rsp+60],rdx
       mov       [rsp+20],rcx
       mov       [rsp+28],r9d
       lea       rdx,[rsp+20]
       lea       rcx,[rsp+68]
       lea       r9,[rsp+30]
       mov       r8d,1
       call      qword ptr [7FF9A83ED960]; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       jmp       near ptr M00_L06
M00_L04:
       xor       ecx,ecx
       xor       r9d,r9d
       jmp       short M00_L03
M00_L05:
       movzx     ecx,byte ptr [rsp+90]
       mov       rdx,[rsp+100]
       mov       ebp,[rsp+108]
       add       ecx,0FFFFFFFB
       cmp       ecx,6
       ja        near ptr M00_L06
       mov       ecx,ecx
       lea       r8,[7FF9A7DCB9C8]
       mov       r8d,[r8+rcx*4]
       lea       rax,[M00_L01]
       add       r8,rax
       jmp       r8
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FF9A7E610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       ecx,ebp
       mov       byte ptr [rdi+rcx],2C
       lea       ecx,[rbp+1]
       cmp       ecx,ebx
       jae       near ptr M00_L15
       mov       ecx,ecx
       mov       byte ptr [rdi+rcx],20
       add       ebp,2
       cmp       ebp,ebx
       ja        near ptr M00_L12
       mov       ecx,ebp
       add       rdi,rcx
       sub       ebx,ebp
       jmp       near ptr M00_L06
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FF9A7E610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       near ptr M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],54
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],72
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],75
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       short M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],46
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],61
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],6C
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],73
       cmp       ebx,4
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+4],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        short M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
M00_L06:
       cmp       byte ptr [rsp+93],0
       jne       short M00_L07
       lea       rcx,[rsp+68]
       call      qword ptr [7FF9A83EDB70]; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       jmp       short M00_L08
M00_L07:
       lea       rcx,[rsp+68]
       call      qword ptr [7FF9A83EDF18]
M00_L08:
       movzx     eax,al
       test      eax,eax
       jne       short M00_L09
       cmp       byte ptr [rsp+8C],0
       je        short M00_L10
       cmp       byte ptr [rsp+90],0
       je        short M00_L13
M00_L09:
       test      eax,eax
       jne       near ptr M00_L05
M00_L10:
       mov       rax,[rsi+18]
       add       rsp,128
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       ret
M00_L11:
       call      qword ptr [7FF9A80AD4F8]
       int       3
M00_L12:
       call      qword ptr [7FF9A80AD4E0]
       int       3
M00_L13:
       xor       r9d,r9d
       mov       [rsp+20],r9
       xor       r9d,r9d
       mov       [rsp+28],r9d
       lea       r9,[rsp+20]
       lea       rcx,[rsp+68]
       mov       edx,20
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M00_L14:
       xor       edi,edi
       xor       ebx,ebx
       jmp       near ptr M00_L02
M00_L15:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 808

; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,20
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqu   xmmword ptr [rsp+8],xmm4
       xor       eax,eax
       mov       [rsp+18],rax
       mov       rbx,rcx
       mov       r14d,r8d
       mov       rbp,r9
       lea       rdi,[rbx+30]
       mov       rsi,rdx
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       mov       [rbx+24],r14b
       mov       byte ptr [rbx+25],0
       mov       rax,[rbp]
       mov       [rbx],rax
       mov       rax,[rbp+8]
       mov       [rbx+8],rax
       movzx     eax,byte ptr [rbp+10]
       mov       [rbx+26],al
       movzx     eax,byte ptr [rbp+11]
       mov       [rbx+27],al
       movzx     eax,byte ptr [rbp+12]
       mov       [rbx+2E],al
       movzx     eax,byte ptr [rbp+13]
       mov       [rbx+2C],al
       movzx     eax,byte ptr [rbp+14]
       mov       [rbx+28],al
       movzx     eax,byte ptr [rbp+15]
       mov       [rbx+29],al
       mov       rax,[rbp+18]
       mov       [rbx+40],rax
       cmp       dword ptr [rbx+40],0
       jne       short M01_L00
       mov       dword ptr [rbx+40],40
M01_L00:
       lea       rsi,[rbp+20]
       lea       rdi,[rbx+48]
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       movsq
       xor       eax,eax
       mov       [rbx+20],eax
       mov       [rbx+18],rax
       mov       [rbx+10],rax
       movzx     eax,byte ptr [rbx+24]
       mov       [rbx+2A],al
       mov       byte ptr [rbx+2B],0
       xor       eax,eax
       mov       [rbx+98],rax
       mov       [rbx+0A0],rax
       mov       [rbx+70],rax
       mov       [rbx+78],rax
       mov       [rbx+60],rax
       mov       [rbx+68],rax
       mov       [rbx+80],rax
       mov       [rbx+88],rax
       mov       [rbx+90],rax
       mov       byte ptr [rbx+2D],0
       mov       rax,1810CC07D50
       mov       rax,[rax]
       vmovdqu   xmm0,xmmword ptr [rax+8]
       vmovdqu   xmmword ptr [rsp+8],xmm0
       mov       rdx,[rax+18]
       mov       [rsp+18],rdx
       lea       rdi,[rbx+0A8]
       lea       rsi,[rsp+8]
       call      CORINFO_HELP_ASSIGN_BYREF
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       add       rsp,20
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
; Total bytes of code 305
; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       push      rdi
       push      rsi
       vzeroupper
       mov       rax,rcx
       sub       rax,rdx
       cmp       rax,r8
       jb        near ptr M02_L09
       mov       rax,rdx
       sub       rax,rcx
       cmp       rax,r8
       jb        near ptr M02_L09
       lea       rsi,[rdx+r8]
       lea       rdi,[rcx+r8]
       cmp       r8,10
       jbe       short M02_L05
       cmp       r8,40
       ja        short M02_L03
M02_L00:
       vmovups   xmm0,[rdx]
       vmovups   [rcx],xmm0
       cmp       r8,20
       jbe       short M02_L01
       vmovups   xmm0,[rdx+10]
       vmovups   [rcx+10],xmm0
       cmp       r8,30
       ja        near ptr M02_L08
M02_L01:
       vmovups   xmm0,[rsi-10]
       vmovups   [rdi-10],xmm0
M02_L02:
       pop       rsi
       pop       rdi
       ret
M02_L03:
       cmp       r8,800
       ja        near ptr M02_L10
       mov       rax,r8
       shr       rax,6
M02_L04:
       vmovdqu   ymm0,ymmword ptr [rdx]
       vmovdqu   ymmword ptr [rcx],ymm0
       vmovdqu   ymm0,ymmword ptr [rdx+20]
       vmovdqu   ymmword ptr [rcx+20],ymm0
       add       rcx,40
       add       rdx,40
       dec       rax
       jne       short M02_L04
       and       r8,3F
       cmp       r8,10
       ja        short M02_L00
       jmp       short M02_L01
M02_L05:
       test      r8b,18
       jne       short M02_L06
       test      r8b,4
       jne       short M02_L07
       test      r8,r8
       je        short M02_L02
       movzx     edx,byte ptr [rdx]
       mov       [rcx],dl
       test      r8b,2
       je        short M02_L02
       movsx     r8,word ptr [rsi-2]
       mov       [rdi-2],r8w
       jmp       short M02_L02
M02_L06:
       mov       rdx,[rdx]
       mov       [rcx],rdx
       mov       rcx,[rsi-8]
       mov       [rdi-8],rcx
       jmp       short M02_L02
M02_L07:
       mov       eax,[rdx]
       mov       [rcx],eax
       mov       eax,[rsi-4]
       mov       [rdi-4],eax
       jmp       near ptr M02_L02
M02_L08:
       vmovups   xmm0,[rdx+20]
       vmovups   [rcx+20],xmm0
       jmp       near ptr M02_L01
M02_L09:
       cmp       rcx,rdx
       je        near ptr M02_L02
M02_L10:
       pop       rsi
       pop       rdi
       jmp       qword ptr [7FF9A7E610C0]
; Total bytes of code 268
; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,30
       xor       eax,eax
       mov       [rsp+20],rax
       mov       rsi,rcx
       xor       edi,edi
       xor       ecx,ecx
       mov       [rsi+98],rcx
       mov       [rsi+0A0],rcx
       mov       byte ptr [rsi+2E],0
       mov       ecx,[rsi+20]
       movsxd    rax,ecx
       mov       edx,[rsi+38]
       cmp       rax,rdx
       jl        short M03_L02
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L00
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L00:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L16
       cmp       byte ptr [rsi+44],2
       jne       short M03_L01
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L01:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L17
       jmp       near ptr M03_L14
M03_L02:
       lea       rax,[rsi+30]
       cmp       ecx,[rax+8]
       jae       near ptr M03_L21
       mov       rax,[rax]
       mov       ecx,ecx
       movzx     edx,byte ptr [rax+rcx]
       cmp       edx,20
       jg        near ptr M03_L06
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBD0]
       mov       ecx,[rsi+20]
       movsxd    rdx,ecx
       mov       eax,[rsi+38]
       cmp       rdx,rax
       jl        short M03_L05
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L03
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L03:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L18
       cmp       byte ptr [rsi+44],2
       jne       short M03_L04
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L04:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L19
       jmp       near ptr M03_L14
M03_L05:
       lea       rdx,[rsi+30]
       cmp       ecx,[rdx+8]
       jae       near ptr M03_L21
       mov       rdx,[rdx]
       mov       ecx,ecx
       movzx     edx,byte ptr [rdx+rcx]
M03_L06:
       movsxd    rcx,dword ptr [rsi+20]
       mov       [rsi+18],rcx
       movzx     ebx,byte ptr [rsi+28]
       test      ebx,ebx
       je        near ptr M03_L15
       cmp       edx,2F
       jne       short M03_L08
M03_L07:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDD50]; System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L08:
       cmp       ebx,1
       jne       short M03_L10
       cmp       edx,7D
       jne       short M03_L09
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDB10]; System.Text.Json.Utf8JsonReader.EndObject()
       jmp       short M03_L13
M03_L09:
       cmp       edx,22
       jne       near ptr M03_L20
       mov       ebx,[rsi+20]
       mov       rbp,[rsi+8]
       mov       r14,[rsi]
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDC60]; System.Text.Json.Utf8JsonReader.ConsumePropertyName()
       mov       edi,eax
       test      edi,edi
       jne       short M03_L14
       mov       [rsi+20],ebx
       mov       byte ptr [rsi+28],1
       mov       [rsi+8],rbp
       mov       [rsi],r14
       jmp       short M03_L14
M03_L10:
       cmp       ebx,3
       jne       short M03_L12
       cmp       edx,5D
       jne       short M03_L11
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDB40]; System.Text.Json.Utf8JsonReader.EndArray()
       jmp       short M03_L13
M03_L11:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBE8]; System.Text.Json.Utf8JsonReader.ConsumeValue(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L12:
       cmp       ebx,5
       jne       short M03_L07
       jmp       short M03_L11
M03_L13:
       mov       edi,1
M03_L14:
       mov       eax,edi
       add       rsp,30
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
M03_L15:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBB8]; System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L16:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L17:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L18:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L19:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L20:
       xor       ecx,ecx
       mov       [rsp+20],rcx
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       r8d,edx
       mov       edx,0C
       call      qword ptr [7FF9A8431378]
       int       3
M03_L21:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 687

Compare Jit Disasm

; System.Text.Json.Tests.Perf_Reader.ReadReturnBytes()
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,128
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqa   xmmword ptr [rsp+20],xmm4
       mov       rax,0FFFFFFFFFFFFFF10
M00_L00:
       vmovdqa   xmmword ptr [rsp+rax+120],xmm4
       vmovdqa   xmmword ptr [rsp+rax+130],xmm4
       vmovdqa   xmmword ptr [rsp+rax+140],xmm4
       add       rax,30
       jne       short M00_L00
       mov       [rsp+120],rax
       mov       rsi,rcx
M00_L01:
       mov       rdx,[rsi+18]
       test      rdx,rdx
       je        near ptr M00_L14
       lea       rdi,[rdx+10]
       mov       ebx,[rdx+8]
M00_L02:
       mov       rdx,[rsi+10]
       test      rdx,rdx
       je        short M00_L04
       lea       rcx,[rdx+10]
       mov       r9d,[rdx+8]
M00_L03:
       xor       edx,edx
       mov       [rsp+30],rdx
       mov       [rsp+38],rdx
       mov       byte ptr [rsp+40],0
       mov       byte ptr [rsp+41],0
       mov       byte ptr [rsp+42],0
       mov       byte ptr [rsp+43],0
       mov       byte ptr [rsp+44],0
       mov       byte ptr [rsp+45],0
       mov       [rsp+48],rdx
       vxorps    xmm0,xmm0,xmm0
       vmovdqu   xmmword ptr [rsp+50],xmm0
       mov       [rsp+60],rdx
       mov       [rsp+20],rcx
       mov       [rsp+28],r9d
       lea       rdx,[rsp+20]
       lea       rcx,[rsp+68]
       lea       r9,[rsp+30]
       mov       r8d,1
       call      qword ptr [7FFA7D6ED960]; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       jmp       near ptr M00_L06
M00_L04:
       xor       ecx,ecx
       xor       r9d,r9d
       jmp       short M00_L03
M00_L05:
       movzx     ecx,byte ptr [rsp+90]
       mov       rdx,[rsp+100]
       mov       ebp,[rsp+108]
       add       ecx,0FFFFFFFB
       cmp       ecx,6
       ja        near ptr M00_L06
       mov       ecx,ecx
       lea       r8,[7FFA7D0C8F88]
       mov       r8d,[r8+rcx*4]
       lea       rax,[M00_L01]
       add       r8,rax
       jmp       r8
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FFA7D1610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       ecx,ebp
       mov       byte ptr [rdi+rcx],2C
       lea       ecx,[rbp+1]
       cmp       ecx,ebx
       jae       near ptr M00_L15
       mov       ecx,ecx
       mov       byte ptr [rdi+rcx],20
       add       ebp,2
       cmp       ebp,ebx
       ja        near ptr M00_L12
       mov       ecx,ebp
       add       rdi,rcx
       sub       ebx,ebp
       jmp       near ptr M00_L06
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FFA7D1610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       near ptr M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],54
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],72
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],75
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       short M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],46
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],61
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],6C
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],73
       cmp       ebx,4
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+4],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        short M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
M00_L06:
       cmp       byte ptr [rsp+93],0
       jne       short M00_L07
       lea       rcx,[rsp+68]
       call      qword ptr [7FFA7D6EDB70]; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       jmp       short M00_L08
M00_L07:
       lea       rcx,[rsp+68]
       call      qword ptr [7FFA7D6EDF18]
M00_L08:
       movzx     eax,al
       test      eax,eax
       jne       short M00_L09
       cmp       byte ptr [rsp+8C],0
       je        short M00_L10
       cmp       byte ptr [rsp+90],0
       je        short M00_L13
M00_L09:
       test      eax,eax
       jne       near ptr M00_L05
M00_L10:
       mov       rax,[rsi+18]
       add       rsp,128
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       ret
M00_L11:
       call      qword ptr [7FFA7D3AD4F8]
       int       3
M00_L12:
       call      qword ptr [7FFA7D3AD4E0]
       int       3
M00_L13:
       xor       r9d,r9d
       mov       [rsp+20],r9
       xor       r9d,r9d
       mov       [rsp+28],r9d
       lea       r9,[rsp+20]
       lea       rcx,[rsp+68]
       mov       edx,20
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M00_L14:
       xor       edi,edi
       xor       ebx,ebx
       jmp       near ptr M00_L02
M00_L15:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 808
; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,20
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqu   xmmword ptr [rsp+8],xmm4
       xor       eax,eax
       mov       [rsp+18],rax
       mov       rbx,rcx
       mov       r14d,r8d
       mov       rbp,r9
       lea       rdi,[rbx+30]
       mov       rsi,rdx
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       mov       [rbx+24],r14b
       mov       byte ptr [rbx+25],0
       mov       rax,[rbp]
       mov       [rbx],rax
       mov       rax,[rbp+8]
       mov       [rbx+8],rax
       movzx     eax,byte ptr [rbp+10]
       mov       [rbx+26],al
       movzx     eax,byte ptr [rbp+11]
       mov       [rbx+27],al
       movzx     eax,byte ptr [rbp+12]
       mov       [rbx+2E],al
       movzx     eax,byte ptr [rbp+13]
       mov       [rbx+2C],al
       movzx     eax,byte ptr [rbp+14]
       mov       [rbx+28],al
       movzx     eax,byte ptr [rbp+15]
       mov       [rbx+29],al
       mov       rax,[rbp+18]
       mov       [rbx+40],rax
       cmp       dword ptr [rbx+40],0
       jne       short M01_L00
       mov       dword ptr [rbx+40],40
M01_L00:
       lea       rsi,[rbp+20]
       lea       rdi,[rbx+48]
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       movsq
       xor       eax,eax
       mov       [rbx+20],eax
       mov       [rbx+18],rax
       mov       [rbx+10],rax
       movzx     eax,byte ptr [rbx+24]
       mov       [rbx+2A],al
       mov       byte ptr [rbx+2B],0
       xor       eax,eax
       mov       [rbx+98],rax
       mov       [rbx+0A0],rax
       mov       [rbx+70],rax
       mov       [rbx+78],rax
       mov       [rbx+60],rax
       mov       [rbx+68],rax
       mov       [rbx+80],rax
       mov       [rbx+88],rax
       mov       [rbx+90],rax
       mov       byte ptr [rbx+2D],0
       mov       rax,1984AC07D50
       mov       rax,[rax]
       vmovdqu   xmm0,xmmword ptr [rax+8]
       vmovdqu   xmmword ptr [rsp+8],xmm0
       mov       rdx,[rax+18]
       mov       [rsp+18],rdx
       lea       rdi,[rbx+0A8]
       lea       rsi,[rsp+8]
       call      CORINFO_HELP_ASSIGN_BYREF
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       add       rsp,20
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
; Total bytes of code 305
; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       push      rdi
       push      rsi
       vzeroupper
       mov       rax,rcx
       sub       rax,rdx
       cmp       rax,r8
       jb        near ptr M02_L09
       mov       rax,rdx
       sub       rax,rcx
       cmp       rax,r8
       jb        near ptr M02_L09
       lea       rsi,[rdx+r8]
       lea       rdi,[rcx+r8]
       cmp       r8,10
       jbe       short M02_L05
       cmp       r8,40
       ja        short M02_L03
M02_L00:
       vmovups   xmm0,[rdx]
       vmovups   [rcx],xmm0
       cmp       r8,20
       jbe       short M02_L01
       vmovups   xmm0,[rdx+10]
       vmovups   [rcx+10],xmm0
       cmp       r8,30
       ja        near ptr M02_L08
M02_L01:
       vmovups   xmm0,[rsi-10]
       vmovups   [rdi-10],xmm0
M02_L02:
       pop       rsi
       pop       rdi
       ret
M02_L03:
       cmp       r8,800
       ja        near ptr M02_L10
       mov       rax,r8
       shr       rax,6
M02_L04:
       vmovdqu   ymm0,ymmword ptr [rdx]
       vmovdqu   ymmword ptr [rcx],ymm0
       vmovdqu   ymm0,ymmword ptr [rdx+20]
       vmovdqu   ymmword ptr [rcx+20],ymm0
       add       rcx,40
       add       rdx,40
       dec       rax
       jne       short M02_L04
       and       r8,3F
       cmp       r8,10
       ja        short M02_L00
       jmp       short M02_L01
M02_L05:
       test      r8b,18
       jne       short M02_L06
       test      r8b,4
       jne       short M02_L07
       test      r8,r8
       je        short M02_L02
       movzx     edx,byte ptr [rdx]
       mov       [rcx],dl
       test      r8b,2
       je        short M02_L02
       movsx     r8,word ptr [rsi-2]
       mov       [rdi-2],r8w
       jmp       short M02_L02
M02_L06:
       mov       rdx,[rdx]
       mov       [rcx],rdx
       mov       rcx,[rsi-8]
       mov       [rdi-8],rcx
       jmp       short M02_L02
M02_L07:
       mov       eax,[rdx]
       mov       [rcx],eax
       mov       eax,[rsi-4]
       mov       [rdi-4],eax
       jmp       near ptr M02_L02
M02_L08:
       vmovups   xmm0,[rdx+20]
       vmovups   [rcx+20],xmm0
       jmp       near ptr M02_L01
M02_L09:
       cmp       rcx,rdx
       je        near ptr M02_L02
M02_L10:
       pop       rsi
       pop       rdi
       jmp       qword ptr [7FFA7D1610C0]
; Total bytes of code 268
; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,30
       xor       eax,eax
       mov       [rsp+20],rax
       mov       rsi,rcx
       xor       edi,edi
       xor       ecx,ecx
       mov       [rsi+98],rcx
       mov       [rsi+0A0],rcx
       mov       byte ptr [rsi+2E],0
       mov       ecx,[rsi+20]
       movsxd    rax,ecx
       mov       edx,[rsi+38]
       cmp       rax,rdx
       jl        short M03_L02
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L00
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L00:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L16
       cmp       byte ptr [rsi+44],2
       jne       short M03_L01
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L01:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L17
       jmp       near ptr M03_L14
M03_L02:
       lea       rax,[rsi+30]
       cmp       ecx,[rax+8]
       jae       near ptr M03_L21
       mov       rax,[rax]
       mov       ecx,ecx
       movzx     edx,byte ptr [rax+rcx]
       cmp       edx,20
       jg        near ptr M03_L06
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBD0]
       mov       ecx,[rsi+20]
       movsxd    rdx,ecx
       mov       eax,[rsi+38]
       cmp       rdx,rax
       jl        short M03_L05
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L03
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L03:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L18
       cmp       byte ptr [rsi+44],2
       jne       short M03_L04
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L04:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L19
       jmp       near ptr M03_L14
M03_L05:
       lea       rdx,[rsi+30]
       cmp       ecx,[rdx+8]
       jae       near ptr M03_L21
       mov       rdx,[rdx]
       mov       ecx,ecx
       movzx     edx,byte ptr [rdx+rcx]
M03_L06:
       movsxd    rcx,dword ptr [rsi+20]
       mov       [rsi+18],rcx
       movzx     ebx,byte ptr [rsi+28]
       test      ebx,ebx
       je        near ptr M03_L15
       cmp       edx,2F
       jne       short M03_L08
M03_L07:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDD50]; System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L08:
       cmp       ebx,1
       jne       short M03_L10
       cmp       edx,7D
       jne       short M03_L09
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDB10]; System.Text.Json.Utf8JsonReader.EndObject()
       jmp       short M03_L13
M03_L09:
       cmp       edx,22
       jne       near ptr M03_L20
       mov       ebx,[rsi+20]
       mov       rbp,[rsi+8]
       mov       r14,[rsi]
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDC60]; System.Text.Json.Utf8JsonReader.ConsumePropertyName()
       mov       edi,eax
       test      edi,edi
       jne       short M03_L14
       mov       [rsi+20],ebx
       mov       byte ptr [rsi+28],1
       mov       [rsi+8],rbp
       mov       [rsi],r14
       jmp       short M03_L14
M03_L10:
       cmp       ebx,3
       jne       short M03_L12
       cmp       edx,5D
       jne       short M03_L11
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDB40]; System.Text.Json.Utf8JsonReader.EndArray()
       jmp       short M03_L13
M03_L11:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBE8]; System.Text.Json.Utf8JsonReader.ConsumeValue(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L12:
       cmp       ebx,5
       jne       short M03_L07
       jmp       short M03_L11
M03_L13:
       mov       edi,1
M03_L14:
       mov       eax,edi
       add       rsp,30
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
M03_L15:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBB8]; System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L16:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L17:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L18:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L19:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L20:
       xor       ecx,ecx
       mov       [rsp+20],rcx
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       r8d,edx
       mov       edx,0C
       call      qword ptr [7FFA7D731378]
       int       3
M03_L21:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 687

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository
@performanceautofiler performanceautofiler bot added the untriaged New issue has not been triaged by the area owner label Feb 14, 2023
@cincuranet cincuranet changed the title [Perf] Windows/x64: 1 Regression on 2/8/2023 12:20:29 PM Regressions in System.Text.Json.Tests.Perf_Reader Feb 14, 2023
@cincuranet cincuranet removed the untriaged New issue has not been triaged by the area owner label Feb 14, 2023
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Feb 14, 2023
@cincuranet cincuranet transferred this issue from dotnet/perf-autofiling-issues Feb 14, 2023
@ghost ghost added the untriaged New issue has not been triaged by the area owner label Feb 14, 2023
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ghost commented Feb 14, 2023

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch, @kunalspathak
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Issue Details

Run Information

Architecture x64
OS Windows 10.0.18362
Baseline 59dddfdef247b9b85a69d663a1d1c1746206711e
Compare 081d93a5e8817d47e660a38404c08364c286172f
Diff Diff

Regressions in System.Text.Json.Tests.Perf_Reader

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio Baseline ETL Compare ETL
ReadReturnBytes - Duration of single invocation 1.63 μs 1.81 μs 1.11 0.03 False Trace Trace

graph
Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Payloads

Baseline
Compare

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Reader*'

Payloads

Baseline
Compare

Histogram

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: True, TestCase: LotsOfStrings)

Description of detection logic

IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 1.8132940036377063 > 1.6728543734938812.
IsChangePoint: Marked as a change because one of 2/8/2023 6:12:15 AM, 2/14/2023 2:39:38 AM falls between 2/4/2023 10:21:07 PM and 2/14/2023 2:39:38 AM.
IsRegressionStdDev: Marked as regression because -40.54798471062194 (T) = (0 -1824.8238399658435) / Math.Sqrt((457.4417773191006 / (34)) + (635.9433397879968 / (27))) is less than -2.000995378087428 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (34) + (27) - 2, .025) and -0.15630228651064987 = (1578.1546583917755 - 1824.8238399658435) / 1578.1546583917755 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```### Baseline Jit Disasm

```assembly
; System.Text.Json.Tests.Perf_Reader.ReadReturnBytes()
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,128
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqa   xmmword ptr [rsp+20],xmm4
       mov       rax,0FFFFFFFFFFFFFF10
M00_L00:
       vmovdqa   xmmword ptr [rsp+rax+120],xmm4
       vmovdqa   xmmword ptr [rsp+rax+130],xmm4
       vmovdqa   xmmword ptr [rsp+rax+140],xmm4
       add       rax,30
       jne       short M00_L00
       mov       [rsp+120],rax
       mov       rsi,rcx
M00_L01:
       mov       rdx,[rsi+18]
       test      rdx,rdx
       je        near ptr M00_L14
       lea       rdi,[rdx+10]
       mov       ebx,[rdx+8]
M00_L02:
       mov       rdx,[rsi+10]
       test      rdx,rdx
       je        short M00_L04
       lea       rcx,[rdx+10]
       mov       r9d,[rdx+8]
M00_L03:
       xor       edx,edx
       mov       [rsp+30],rdx
       mov       [rsp+38],rdx
       mov       byte ptr [rsp+40],0
       mov       byte ptr [rsp+41],0
       mov       byte ptr [rsp+42],0
       mov       byte ptr [rsp+43],0
       mov       byte ptr [rsp+44],0
       mov       byte ptr [rsp+45],0
       mov       [rsp+48],rdx
       vxorps    xmm0,xmm0,xmm0
       vmovdqu   xmmword ptr [rsp+50],xmm0
       mov       [rsp+60],rdx
       mov       [rsp+20],rcx
       mov       [rsp+28],r9d
       lea       rdx,[rsp+20]
       lea       rcx,[rsp+68]
       lea       r9,[rsp+30]
       mov       r8d,1
       call      qword ptr [7FF9A83ED960]; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       jmp       near ptr M00_L06
M00_L04:
       xor       ecx,ecx
       xor       r9d,r9d
       jmp       short M00_L03
M00_L05:
       movzx     ecx,byte ptr [rsp+90]
       mov       rdx,[rsp+100]
       mov       ebp,[rsp+108]
       add       ecx,0FFFFFFFB
       cmp       ecx,6
       ja        near ptr M00_L06
       mov       ecx,ecx
       lea       r8,[7FF9A7DCB9C8]
       mov       r8d,[r8+rcx*4]
       lea       rax,[M00_L01]
       add       r8,rax
       jmp       r8
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FF9A7E610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       ecx,ebp
       mov       byte ptr [rdi+rcx],2C
       lea       ecx,[rbp+1]
       cmp       ecx,ebx
       jae       near ptr M00_L15
       mov       ecx,ecx
       mov       byte ptr [rdi+rcx],20
       add       ebp,2
       cmp       ebp,ebx
       ja        near ptr M00_L12
       mov       ecx,ebp
       add       rdi,rcx
       sub       ebx,ebp
       jmp       near ptr M00_L06
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FF9A7E610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       near ptr M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],54
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],72
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],75
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       short M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],46
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],61
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],6C
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],73
       cmp       ebx,4
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+4],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        short M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
M00_L06:
       cmp       byte ptr [rsp+93],0
       jne       short M00_L07
       lea       rcx,[rsp+68]
       call      qword ptr [7FF9A83EDB70]; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       jmp       short M00_L08
M00_L07:
       lea       rcx,[rsp+68]
       call      qword ptr [7FF9A83EDF18]
M00_L08:
       movzx     eax,al
       test      eax,eax
       jne       short M00_L09
       cmp       byte ptr [rsp+8C],0
       je        short M00_L10
       cmp       byte ptr [rsp+90],0
       je        short M00_L13
M00_L09:
       test      eax,eax
       jne       near ptr M00_L05
M00_L10:
       mov       rax,[rsi+18]
       add       rsp,128
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       ret
M00_L11:
       call      qword ptr [7FF9A80AD4F8]
       int       3
M00_L12:
       call      qword ptr [7FF9A80AD4E0]
       int       3
M00_L13:
       xor       r9d,r9d
       mov       [rsp+20],r9
       xor       r9d,r9d
       mov       [rsp+28],r9d
       lea       r9,[rsp+20]
       lea       rcx,[rsp+68]
       mov       edx,20
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M00_L14:
       xor       edi,edi
       xor       ebx,ebx
       jmp       near ptr M00_L02
M00_L15:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 808

; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,20
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqu   xmmword ptr [rsp+8],xmm4
       xor       eax,eax
       mov       [rsp+18],rax
       mov       rbx,rcx
       mov       r14d,r8d
       mov       rbp,r9
       lea       rdi,[rbx+30]
       mov       rsi,rdx
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       mov       [rbx+24],r14b
       mov       byte ptr [rbx+25],0
       mov       rax,[rbp]
       mov       [rbx],rax
       mov       rax,[rbp+8]
       mov       [rbx+8],rax
       movzx     eax,byte ptr [rbp+10]
       mov       [rbx+26],al
       movzx     eax,byte ptr [rbp+11]
       mov       [rbx+27],al
       movzx     eax,byte ptr [rbp+12]
       mov       [rbx+2E],al
       movzx     eax,byte ptr [rbp+13]
       mov       [rbx+2C],al
       movzx     eax,byte ptr [rbp+14]
       mov       [rbx+28],al
       movzx     eax,byte ptr [rbp+15]
       mov       [rbx+29],al
       mov       rax,[rbp+18]
       mov       [rbx+40],rax
       cmp       dword ptr [rbx+40],0
       jne       short M01_L00
       mov       dword ptr [rbx+40],40
M01_L00:
       lea       rsi,[rbp+20]
       lea       rdi,[rbx+48]
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       movsq
       xor       eax,eax
       mov       [rbx+20],eax
       mov       [rbx+18],rax
       mov       [rbx+10],rax
       movzx     eax,byte ptr [rbx+24]
       mov       [rbx+2A],al
       mov       byte ptr [rbx+2B],0
       xor       eax,eax
       mov       [rbx+98],rax
       mov       [rbx+0A0],rax
       mov       [rbx+70],rax
       mov       [rbx+78],rax
       mov       [rbx+60],rax
       mov       [rbx+68],rax
       mov       [rbx+80],rax
       mov       [rbx+88],rax
       mov       [rbx+90],rax
       mov       byte ptr [rbx+2D],0
       mov       rax,1810CC07D50
       mov       rax,[rax]
       vmovdqu   xmm0,xmmword ptr [rax+8]
       vmovdqu   xmmword ptr [rsp+8],xmm0
       mov       rdx,[rax+18]
       mov       [rsp+18],rdx
       lea       rdi,[rbx+0A8]
       lea       rsi,[rsp+8]
       call      CORINFO_HELP_ASSIGN_BYREF
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       add       rsp,20
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
; Total bytes of code 305
; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       push      rdi
       push      rsi
       vzeroupper
       mov       rax,rcx
       sub       rax,rdx
       cmp       rax,r8
       jb        near ptr M02_L09
       mov       rax,rdx
       sub       rax,rcx
       cmp       rax,r8
       jb        near ptr M02_L09
       lea       rsi,[rdx+r8]
       lea       rdi,[rcx+r8]
       cmp       r8,10
       jbe       short M02_L05
       cmp       r8,40
       ja        short M02_L03
M02_L00:
       vmovups   xmm0,[rdx]
       vmovups   [rcx],xmm0
       cmp       r8,20
       jbe       short M02_L01
       vmovups   xmm0,[rdx+10]
       vmovups   [rcx+10],xmm0
       cmp       r8,30
       ja        near ptr M02_L08
M02_L01:
       vmovups   xmm0,[rsi-10]
       vmovups   [rdi-10],xmm0
M02_L02:
       pop       rsi
       pop       rdi
       ret
M02_L03:
       cmp       r8,800
       ja        near ptr M02_L10
       mov       rax,r8
       shr       rax,6
M02_L04:
       vmovdqu   ymm0,ymmword ptr [rdx]
       vmovdqu   ymmword ptr [rcx],ymm0
       vmovdqu   ymm0,ymmword ptr [rdx+20]
       vmovdqu   ymmword ptr [rcx+20],ymm0
       add       rcx,40
       add       rdx,40
       dec       rax
       jne       short M02_L04
       and       r8,3F
       cmp       r8,10
       ja        short M02_L00
       jmp       short M02_L01
M02_L05:
       test      r8b,18
       jne       short M02_L06
       test      r8b,4
       jne       short M02_L07
       test      r8,r8
       je        short M02_L02
       movzx     edx,byte ptr [rdx]
       mov       [rcx],dl
       test      r8b,2
       je        short M02_L02
       movsx     r8,word ptr [rsi-2]
       mov       [rdi-2],r8w
       jmp       short M02_L02
M02_L06:
       mov       rdx,[rdx]
       mov       [rcx],rdx
       mov       rcx,[rsi-8]
       mov       [rdi-8],rcx
       jmp       short M02_L02
M02_L07:
       mov       eax,[rdx]
       mov       [rcx],eax
       mov       eax,[rsi-4]
       mov       [rdi-4],eax
       jmp       near ptr M02_L02
M02_L08:
       vmovups   xmm0,[rdx+20]
       vmovups   [rcx+20],xmm0
       jmp       near ptr M02_L01
M02_L09:
       cmp       rcx,rdx
       je        near ptr M02_L02
M02_L10:
       pop       rsi
       pop       rdi
       jmp       qword ptr [7FF9A7E610C0]
; Total bytes of code 268
; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,30
       xor       eax,eax
       mov       [rsp+20],rax
       mov       rsi,rcx
       xor       edi,edi
       xor       ecx,ecx
       mov       [rsi+98],rcx
       mov       [rsi+0A0],rcx
       mov       byte ptr [rsi+2E],0
       mov       ecx,[rsi+20]
       movsxd    rax,ecx
       mov       edx,[rsi+38]
       cmp       rax,rdx
       jl        short M03_L02
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L00
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L00:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L16
       cmp       byte ptr [rsi+44],2
       jne       short M03_L01
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L01:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L17
       jmp       near ptr M03_L14
M03_L02:
       lea       rax,[rsi+30]
       cmp       ecx,[rax+8]
       jae       near ptr M03_L21
       mov       rax,[rax]
       mov       ecx,ecx
       movzx     edx,byte ptr [rax+rcx]
       cmp       edx,20
       jg        near ptr M03_L06
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBD0]
       mov       ecx,[rsi+20]
       movsxd    rdx,ecx
       mov       eax,[rsi+38]
       cmp       rdx,rax
       jl        short M03_L05
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L03
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L03:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L18
       cmp       byte ptr [rsi+44],2
       jne       short M03_L04
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L04:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L19
       jmp       near ptr M03_L14
M03_L05:
       lea       rdx,[rsi+30]
       cmp       ecx,[rdx+8]
       jae       near ptr M03_L21
       mov       rdx,[rdx]
       mov       ecx,ecx
       movzx     edx,byte ptr [rdx+rcx]
M03_L06:
       movsxd    rcx,dword ptr [rsi+20]
       mov       [rsi+18],rcx
       movzx     ebx,byte ptr [rsi+28]
       test      ebx,ebx
       je        near ptr M03_L15
       cmp       edx,2F
       jne       short M03_L08
M03_L07:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDD50]; System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L08:
       cmp       ebx,1
       jne       short M03_L10
       cmp       edx,7D
       jne       short M03_L09
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDB10]; System.Text.Json.Utf8JsonReader.EndObject()
       jmp       short M03_L13
M03_L09:
       cmp       edx,22
       jne       near ptr M03_L20
       mov       ebx,[rsi+20]
       mov       rbp,[rsi+8]
       mov       r14,[rsi]
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDC60]; System.Text.Json.Utf8JsonReader.ConsumePropertyName()
       mov       edi,eax
       test      edi,edi
       jne       short M03_L14
       mov       [rsi+20],ebx
       mov       byte ptr [rsi+28],1
       mov       [rsi+8],rbp
       mov       [rsi],r14
       jmp       short M03_L14
M03_L10:
       cmp       ebx,3
       jne       short M03_L12
       cmp       edx,5D
       jne       short M03_L11
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDB40]; System.Text.Json.Utf8JsonReader.EndArray()
       jmp       short M03_L13
M03_L11:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBE8]; System.Text.Json.Utf8JsonReader.ConsumeValue(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L12:
       cmp       ebx,5
       jne       short M03_L07
       jmp       short M03_L11
M03_L13:
       mov       edi,1
M03_L14:
       mov       eax,edi
       add       rsp,30
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
M03_L15:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBB8]; System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L16:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L17:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L18:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L19:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L20:
       xor       ecx,ecx
       mov       [rsp+20],rcx
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       r8d,edx
       mov       edx,0C
       call      qword ptr [7FF9A8431378]
       int       3
M03_L21:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 687

Compare Jit Disasm

; System.Text.Json.Tests.Perf_Reader.ReadReturnBytes()
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,128
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqa   xmmword ptr [rsp+20],xmm4
       mov       rax,0FFFFFFFFFFFFFF10
M00_L00:
       vmovdqa   xmmword ptr [rsp+rax+120],xmm4
       vmovdqa   xmmword ptr [rsp+rax+130],xmm4
       vmovdqa   xmmword ptr [rsp+rax+140],xmm4
       add       rax,30
       jne       short M00_L00
       mov       [rsp+120],rax
       mov       rsi,rcx
M00_L01:
       mov       rdx,[rsi+18]
       test      rdx,rdx
       je        near ptr M00_L14
       lea       rdi,[rdx+10]
       mov       ebx,[rdx+8]
M00_L02:
       mov       rdx,[rsi+10]
       test      rdx,rdx
       je        short M00_L04
       lea       rcx,[rdx+10]
       mov       r9d,[rdx+8]
M00_L03:
       xor       edx,edx
       mov       [rsp+30],rdx
       mov       [rsp+38],rdx
       mov       byte ptr [rsp+40],0
       mov       byte ptr [rsp+41],0
       mov       byte ptr [rsp+42],0
       mov       byte ptr [rsp+43],0
       mov       byte ptr [rsp+44],0
       mov       byte ptr [rsp+45],0
       mov       [rsp+48],rdx
       vxorps    xmm0,xmm0,xmm0
       vmovdqu   xmmword ptr [rsp+50],xmm0
       mov       [rsp+60],rdx
       mov       [rsp+20],rcx
       mov       [rsp+28],r9d
       lea       rdx,[rsp+20]
       lea       rcx,[rsp+68]
       lea       r9,[rsp+30]
       mov       r8d,1
       call      qword ptr [7FFA7D6ED960]; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       jmp       near ptr M00_L06
M00_L04:
       xor       ecx,ecx
       xor       r9d,r9d
       jmp       short M00_L03
M00_L05:
       movzx     ecx,byte ptr [rsp+90]
       mov       rdx,[rsp+100]
       mov       ebp,[rsp+108]
       add       ecx,0FFFFFFFB
       cmp       ecx,6
       ja        near ptr M00_L06
       mov       ecx,ecx
       lea       r8,[7FFA7D0C8F88]
       mov       r8d,[r8+rcx*4]
       lea       rax,[M00_L01]
       add       r8,rax
       jmp       r8
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FFA7D1610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       ecx,ebp
       mov       byte ptr [rdi+rcx],2C
       lea       ecx,[rbp+1]
       cmp       ecx,ebx
       jae       near ptr M00_L15
       mov       ecx,ecx
       mov       byte ptr [rdi+rcx],20
       add       ebp,2
       cmp       ebp,ebx
       ja        near ptr M00_L12
       mov       ecx,ebp
       add       rdi,rcx
       sub       ebx,ebp
       jmp       near ptr M00_L06
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FFA7D1610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       near ptr M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],54
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],72
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],75
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       short M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],46
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],61
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],6C
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],73
       cmp       ebx,4
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+4],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        short M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
M00_L06:
       cmp       byte ptr [rsp+93],0
       jne       short M00_L07
       lea       rcx,[rsp+68]
       call      qword ptr [7FFA7D6EDB70]; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       jmp       short M00_L08
M00_L07:
       lea       rcx,[rsp+68]
       call      qword ptr [7FFA7D6EDF18]
M00_L08:
       movzx     eax,al
       test      eax,eax
       jne       short M00_L09
       cmp       byte ptr [rsp+8C],0
       je        short M00_L10
       cmp       byte ptr [rsp+90],0
       je        short M00_L13
M00_L09:
       test      eax,eax
       jne       near ptr M00_L05
M00_L10:
       mov       rax,[rsi+18]
       add       rsp,128
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       ret
M00_L11:
       call      qword ptr [7FFA7D3AD4F8]
       int       3
M00_L12:
       call      qword ptr [7FFA7D3AD4E0]
       int       3
M00_L13:
       xor       r9d,r9d
       mov       [rsp+20],r9
       xor       r9d,r9d
       mov       [rsp+28],r9d
       lea       r9,[rsp+20]
       lea       rcx,[rsp+68]
       mov       edx,20
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M00_L14:
       xor       edi,edi
       xor       ebx,ebx
       jmp       near ptr M00_L02
M00_L15:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 808
; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,20
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqu   xmmword ptr [rsp+8],xmm4
       xor       eax,eax
       mov       [rsp+18],rax
       mov       rbx,rcx
       mov       r14d,r8d
       mov       rbp,r9
       lea       rdi,[rbx+30]
       mov       rsi,rdx
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       mov       [rbx+24],r14b
       mov       byte ptr [rbx+25],0
       mov       rax,[rbp]
       mov       [rbx],rax
       mov       rax,[rbp+8]
       mov       [rbx+8],rax
       movzx     eax,byte ptr [rbp+10]
       mov       [rbx+26],al
       movzx     eax,byte ptr [rbp+11]
       mov       [rbx+27],al
       movzx     eax,byte ptr [rbp+12]
       mov       [rbx+2E],al
       movzx     eax,byte ptr [rbp+13]
       mov       [rbx+2C],al
       movzx     eax,byte ptr [rbp+14]
       mov       [rbx+28],al
       movzx     eax,byte ptr [rbp+15]
       mov       [rbx+29],al
       mov       rax,[rbp+18]
       mov       [rbx+40],rax
       cmp       dword ptr [rbx+40],0
       jne       short M01_L00
       mov       dword ptr [rbx+40],40
M01_L00:
       lea       rsi,[rbp+20]
       lea       rdi,[rbx+48]
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       movsq
       xor       eax,eax
       mov       [rbx+20],eax
       mov       [rbx+18],rax
       mov       [rbx+10],rax
       movzx     eax,byte ptr [rbx+24]
       mov       [rbx+2A],al
       mov       byte ptr [rbx+2B],0
       xor       eax,eax
       mov       [rbx+98],rax
       mov       [rbx+0A0],rax
       mov       [rbx+70],rax
       mov       [rbx+78],rax
       mov       [rbx+60],rax
       mov       [rbx+68],rax
       mov       [rbx+80],rax
       mov       [rbx+88],rax
       mov       [rbx+90],rax
       mov       byte ptr [rbx+2D],0
       mov       rax,1984AC07D50
       mov       rax,[rax]
       vmovdqu   xmm0,xmmword ptr [rax+8]
       vmovdqu   xmmword ptr [rsp+8],xmm0
       mov       rdx,[rax+18]
       mov       [rsp+18],rdx
       lea       rdi,[rbx+0A8]
       lea       rsi,[rsp+8]
       call      CORINFO_HELP_ASSIGN_BYREF
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       add       rsp,20
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
; Total bytes of code 305
; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       push      rdi
       push      rsi
       vzeroupper
       mov       rax,rcx
       sub       rax,rdx
       cmp       rax,r8
       jb        near ptr M02_L09
       mov       rax,rdx
       sub       rax,rcx
       cmp       rax,r8
       jb        near ptr M02_L09
       lea       rsi,[rdx+r8]
       lea       rdi,[rcx+r8]
       cmp       r8,10
       jbe       short M02_L05
       cmp       r8,40
       ja        short M02_L03
M02_L00:
       vmovups   xmm0,[rdx]
       vmovups   [rcx],xmm0
       cmp       r8,20
       jbe       short M02_L01
       vmovups   xmm0,[rdx+10]
       vmovups   [rcx+10],xmm0
       cmp       r8,30
       ja        near ptr M02_L08
M02_L01:
       vmovups   xmm0,[rsi-10]
       vmovups   [rdi-10],xmm0
M02_L02:
       pop       rsi
       pop       rdi
       ret
M02_L03:
       cmp       r8,800
       ja        near ptr M02_L10
       mov       rax,r8
       shr       rax,6
M02_L04:
       vmovdqu   ymm0,ymmword ptr [rdx]
       vmovdqu   ymmword ptr [rcx],ymm0
       vmovdqu   ymm0,ymmword ptr [rdx+20]
       vmovdqu   ymmword ptr [rcx+20],ymm0
       add       rcx,40
       add       rdx,40
       dec       rax
       jne       short M02_L04
       and       r8,3F
       cmp       r8,10
       ja        short M02_L00
       jmp       short M02_L01
M02_L05:
       test      r8b,18
       jne       short M02_L06
       test      r8b,4
       jne       short M02_L07
       test      r8,r8
       je        short M02_L02
       movzx     edx,byte ptr [rdx]
       mov       [rcx],dl
       test      r8b,2
       je        short M02_L02
       movsx     r8,word ptr [rsi-2]
       mov       [rdi-2],r8w
       jmp       short M02_L02
M02_L06:
       mov       rdx,[rdx]
       mov       [rcx],rdx
       mov       rcx,[rsi-8]
       mov       [rdi-8],rcx
       jmp       short M02_L02
M02_L07:
       mov       eax,[rdx]
       mov       [rcx],eax
       mov       eax,[rsi-4]
       mov       [rdi-4],eax
       jmp       near ptr M02_L02
M02_L08:
       vmovups   xmm0,[rdx+20]
       vmovups   [rcx+20],xmm0
       jmp       near ptr M02_L01
M02_L09:
       cmp       rcx,rdx
       je        near ptr M02_L02
M02_L10:
       pop       rsi
       pop       rdi
       jmp       qword ptr [7FFA7D1610C0]
; Total bytes of code 268
; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,30
       xor       eax,eax
       mov       [rsp+20],rax
       mov       rsi,rcx
       xor       edi,edi
       xor       ecx,ecx
       mov       [rsi+98],rcx
       mov       [rsi+0A0],rcx
       mov       byte ptr [rsi+2E],0
       mov       ecx,[rsi+20]
       movsxd    rax,ecx
       mov       edx,[rsi+38]
       cmp       rax,rdx
       jl        short M03_L02
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L00
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L00:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L16
       cmp       byte ptr [rsi+44],2
       jne       short M03_L01
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L01:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L17
       jmp       near ptr M03_L14
M03_L02:
       lea       rax,[rsi+30]
       cmp       ecx,[rax+8]
       jae       near ptr M03_L21
       mov       rax,[rax]
       mov       ecx,ecx
       movzx     edx,byte ptr [rax+rcx]
       cmp       edx,20
       jg        near ptr M03_L06
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBD0]
       mov       ecx,[rsi+20]
       movsxd    rdx,ecx
       mov       eax,[rsi+38]
       cmp       rdx,rax
       jl        short M03_L05
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L03
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L03:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L18
       cmp       byte ptr [rsi+44],2
       jne       short M03_L04
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L04:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L19
       jmp       near ptr M03_L14
M03_L05:
       lea       rdx,[rsi+30]
       cmp       ecx,[rdx+8]
       jae       near ptr M03_L21
       mov       rdx,[rdx]
       mov       ecx,ecx
       movzx     edx,byte ptr [rdx+rcx]
M03_L06:
       movsxd    rcx,dword ptr [rsi+20]
       mov       [rsi+18],rcx
       movzx     ebx,byte ptr [rsi+28]
       test      ebx,ebx
       je        near ptr M03_L15
       cmp       edx,2F
       jne       short M03_L08
M03_L07:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDD50]; System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L08:
       cmp       ebx,1
       jne       short M03_L10
       cmp       edx,7D
       jne       short M03_L09
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDB10]; System.Text.Json.Utf8JsonReader.EndObject()
       jmp       short M03_L13
M03_L09:
       cmp       edx,22
       jne       near ptr M03_L20
       mov       ebx,[rsi+20]
       mov       rbp,[rsi+8]
       mov       r14,[rsi]
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDC60]; System.Text.Json.Utf8JsonReader.ConsumePropertyName()
       mov       edi,eax
       test      edi,edi
       jne       short M03_L14
       mov       [rsi+20],ebx
       mov       byte ptr [rsi+28],1
       mov       [rsi+8],rbp
       mov       [rsi],r14
       jmp       short M03_L14
M03_L10:
       cmp       ebx,3
       jne       short M03_L12
       cmp       edx,5D
       jne       short M03_L11
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDB40]; System.Text.Json.Utf8JsonReader.EndArray()
       jmp       short M03_L13
M03_L11:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBE8]; System.Text.Json.Utf8JsonReader.ConsumeValue(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L12:
       cmp       ebx,5
       jne       short M03_L07
       jmp       short M03_L11
M03_L13:
       mov       edi,1
M03_L14:
       mov       eax,edi
       add       rsp,30
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
M03_L15:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBB8]; System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L16:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L17:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L18:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L19:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L20:
       xor       ecx,ecx
       mov       [rsp+20],rcx
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       r8d,edx
       mov       edx,0C
       call      qword ptr [7FFA7D731378]
       int       3
M03_L21:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 687

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Author: performanceautofiler[bot]
Assignees: EgorBo
Labels:

area-CodeGen-coreclr
Milestone: -

@cincuranet
Copy link
Contributor

Probably caused by #81758.

cc @radekdoulik

@cincuranet cincuranet added tenet-performance Performance related issue tenet-performance-benchmarks Issue from performance benchmark labels Feb 14, 2023
@JulieLeeMSFT JulieLeeMSFT added area-System.Text.Json and removed area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI untriaged New issue has not been triaged by the area owner labels Feb 14, 2023
@ghost
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ghost commented Feb 14, 2023

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis
See info in area-owners.md if you want to be subscribed.

Issue Details

Run Information

Architecture x64
OS Windows 10.0.18362
Baseline 59dddfdef247b9b85a69d663a1d1c1746206711e
Compare 081d93a5e8817d47e660a38404c08364c286172f
Diff Diff

Regressions in System.Text.Json.Tests.Perf_Reader

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio Baseline ETL Compare ETL
ReadReturnBytes - Duration of single invocation 1.63 μs 1.81 μs 1.11 0.03 False Trace Trace

graph
Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Payloads

Baseline
Compare

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Reader*'

Payloads

Baseline
Compare

Histogram

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: True, TestCase: LotsOfStrings)

Description of detection logic

IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 1.8132940036377063 > 1.6728543734938812.
IsChangePoint: Marked as a change because one of 2/8/2023 6:12:15 AM, 2/14/2023 2:39:38 AM falls between 2/4/2023 10:21:07 PM and 2/14/2023 2:39:38 AM.
IsRegressionStdDev: Marked as regression because -40.54798471062194 (T) = (0 -1824.8238399658435) / Math.Sqrt((457.4417773191006 / (34)) + (635.9433397879968 / (27))) is less than -2.000995378087428 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (34) + (27) - 2, .025) and -0.15630228651064987 = (1578.1546583917755 - 1824.8238399658435) / 1578.1546583917755 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```### Baseline Jit Disasm

```assembly
; System.Text.Json.Tests.Perf_Reader.ReadReturnBytes()
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,128
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqa   xmmword ptr [rsp+20],xmm4
       mov       rax,0FFFFFFFFFFFFFF10
M00_L00:
       vmovdqa   xmmword ptr [rsp+rax+120],xmm4
       vmovdqa   xmmword ptr [rsp+rax+130],xmm4
       vmovdqa   xmmword ptr [rsp+rax+140],xmm4
       add       rax,30
       jne       short M00_L00
       mov       [rsp+120],rax
       mov       rsi,rcx
M00_L01:
       mov       rdx,[rsi+18]
       test      rdx,rdx
       je        near ptr M00_L14
       lea       rdi,[rdx+10]
       mov       ebx,[rdx+8]
M00_L02:
       mov       rdx,[rsi+10]
       test      rdx,rdx
       je        short M00_L04
       lea       rcx,[rdx+10]
       mov       r9d,[rdx+8]
M00_L03:
       xor       edx,edx
       mov       [rsp+30],rdx
       mov       [rsp+38],rdx
       mov       byte ptr [rsp+40],0
       mov       byte ptr [rsp+41],0
       mov       byte ptr [rsp+42],0
       mov       byte ptr [rsp+43],0
       mov       byte ptr [rsp+44],0
       mov       byte ptr [rsp+45],0
       mov       [rsp+48],rdx
       vxorps    xmm0,xmm0,xmm0
       vmovdqu   xmmword ptr [rsp+50],xmm0
       mov       [rsp+60],rdx
       mov       [rsp+20],rcx
       mov       [rsp+28],r9d
       lea       rdx,[rsp+20]
       lea       rcx,[rsp+68]
       lea       r9,[rsp+30]
       mov       r8d,1
       call      qword ptr [7FF9A83ED960]; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       jmp       near ptr M00_L06
M00_L04:
       xor       ecx,ecx
       xor       r9d,r9d
       jmp       short M00_L03
M00_L05:
       movzx     ecx,byte ptr [rsp+90]
       mov       rdx,[rsp+100]
       mov       ebp,[rsp+108]
       add       ecx,0FFFFFFFB
       cmp       ecx,6
       ja        near ptr M00_L06
       mov       ecx,ecx
       lea       r8,[7FF9A7DCB9C8]
       mov       r8d,[r8+rcx*4]
       lea       rax,[M00_L01]
       add       r8,rax
       jmp       r8
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FF9A7E610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       ecx,ebp
       mov       byte ptr [rdi+rcx],2C
       lea       ecx,[rbp+1]
       cmp       ecx,ebx
       jae       near ptr M00_L15
       mov       ecx,ecx
       mov       byte ptr [rdi+rcx],20
       add       ebp,2
       cmp       ebp,ebx
       ja        near ptr M00_L12
       mov       ecx,ebp
       add       rdi,rcx
       sub       ebx,ebp
       jmp       near ptr M00_L06
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FF9A7E610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       near ptr M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],54
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],72
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],75
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       short M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],46
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],61
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],6C
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],73
       cmp       ebx,4
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+4],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        short M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
M00_L06:
       cmp       byte ptr [rsp+93],0
       jne       short M00_L07
       lea       rcx,[rsp+68]
       call      qword ptr [7FF9A83EDB70]; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       jmp       short M00_L08
M00_L07:
       lea       rcx,[rsp+68]
       call      qword ptr [7FF9A83EDF18]
M00_L08:
       movzx     eax,al
       test      eax,eax
       jne       short M00_L09
       cmp       byte ptr [rsp+8C],0
       je        short M00_L10
       cmp       byte ptr [rsp+90],0
       je        short M00_L13
M00_L09:
       test      eax,eax
       jne       near ptr M00_L05
M00_L10:
       mov       rax,[rsi+18]
       add       rsp,128
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       ret
M00_L11:
       call      qword ptr [7FF9A80AD4F8]
       int       3
M00_L12:
       call      qword ptr [7FF9A80AD4E0]
       int       3
M00_L13:
       xor       r9d,r9d
       mov       [rsp+20],r9
       xor       r9d,r9d
       mov       [rsp+28],r9d
       lea       r9,[rsp+20]
       lea       rcx,[rsp+68]
       mov       edx,20
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M00_L14:
       xor       edi,edi
       xor       ebx,ebx
       jmp       near ptr M00_L02
M00_L15:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 808

; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,20
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqu   xmmword ptr [rsp+8],xmm4
       xor       eax,eax
       mov       [rsp+18],rax
       mov       rbx,rcx
       mov       r14d,r8d
       mov       rbp,r9
       lea       rdi,[rbx+30]
       mov       rsi,rdx
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       mov       [rbx+24],r14b
       mov       byte ptr [rbx+25],0
       mov       rax,[rbp]
       mov       [rbx],rax
       mov       rax,[rbp+8]
       mov       [rbx+8],rax
       movzx     eax,byte ptr [rbp+10]
       mov       [rbx+26],al
       movzx     eax,byte ptr [rbp+11]
       mov       [rbx+27],al
       movzx     eax,byte ptr [rbp+12]
       mov       [rbx+2E],al
       movzx     eax,byte ptr [rbp+13]
       mov       [rbx+2C],al
       movzx     eax,byte ptr [rbp+14]
       mov       [rbx+28],al
       movzx     eax,byte ptr [rbp+15]
       mov       [rbx+29],al
       mov       rax,[rbp+18]
       mov       [rbx+40],rax
       cmp       dword ptr [rbx+40],0
       jne       short M01_L00
       mov       dword ptr [rbx+40],40
M01_L00:
       lea       rsi,[rbp+20]
       lea       rdi,[rbx+48]
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       movsq
       xor       eax,eax
       mov       [rbx+20],eax
       mov       [rbx+18],rax
       mov       [rbx+10],rax
       movzx     eax,byte ptr [rbx+24]
       mov       [rbx+2A],al
       mov       byte ptr [rbx+2B],0
       xor       eax,eax
       mov       [rbx+98],rax
       mov       [rbx+0A0],rax
       mov       [rbx+70],rax
       mov       [rbx+78],rax
       mov       [rbx+60],rax
       mov       [rbx+68],rax
       mov       [rbx+80],rax
       mov       [rbx+88],rax
       mov       [rbx+90],rax
       mov       byte ptr [rbx+2D],0
       mov       rax,1810CC07D50
       mov       rax,[rax]
       vmovdqu   xmm0,xmmword ptr [rax+8]
       vmovdqu   xmmword ptr [rsp+8],xmm0
       mov       rdx,[rax+18]
       mov       [rsp+18],rdx
       lea       rdi,[rbx+0A8]
       lea       rsi,[rsp+8]
       call      CORINFO_HELP_ASSIGN_BYREF
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       add       rsp,20
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
; Total bytes of code 305
; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       push      rdi
       push      rsi
       vzeroupper
       mov       rax,rcx
       sub       rax,rdx
       cmp       rax,r8
       jb        near ptr M02_L09
       mov       rax,rdx
       sub       rax,rcx
       cmp       rax,r8
       jb        near ptr M02_L09
       lea       rsi,[rdx+r8]
       lea       rdi,[rcx+r8]
       cmp       r8,10
       jbe       short M02_L05
       cmp       r8,40
       ja        short M02_L03
M02_L00:
       vmovups   xmm0,[rdx]
       vmovups   [rcx],xmm0
       cmp       r8,20
       jbe       short M02_L01
       vmovups   xmm0,[rdx+10]
       vmovups   [rcx+10],xmm0
       cmp       r8,30
       ja        near ptr M02_L08
M02_L01:
       vmovups   xmm0,[rsi-10]
       vmovups   [rdi-10],xmm0
M02_L02:
       pop       rsi
       pop       rdi
       ret
M02_L03:
       cmp       r8,800
       ja        near ptr M02_L10
       mov       rax,r8
       shr       rax,6
M02_L04:
       vmovdqu   ymm0,ymmword ptr [rdx]
       vmovdqu   ymmword ptr [rcx],ymm0
       vmovdqu   ymm0,ymmword ptr [rdx+20]
       vmovdqu   ymmword ptr [rcx+20],ymm0
       add       rcx,40
       add       rdx,40
       dec       rax
       jne       short M02_L04
       and       r8,3F
       cmp       r8,10
       ja        short M02_L00
       jmp       short M02_L01
M02_L05:
       test      r8b,18
       jne       short M02_L06
       test      r8b,4
       jne       short M02_L07
       test      r8,r8
       je        short M02_L02
       movzx     edx,byte ptr [rdx]
       mov       [rcx],dl
       test      r8b,2
       je        short M02_L02
       movsx     r8,word ptr [rsi-2]
       mov       [rdi-2],r8w
       jmp       short M02_L02
M02_L06:
       mov       rdx,[rdx]
       mov       [rcx],rdx
       mov       rcx,[rsi-8]
       mov       [rdi-8],rcx
       jmp       short M02_L02
M02_L07:
       mov       eax,[rdx]
       mov       [rcx],eax
       mov       eax,[rsi-4]
       mov       [rdi-4],eax
       jmp       near ptr M02_L02
M02_L08:
       vmovups   xmm0,[rdx+20]
       vmovups   [rcx+20],xmm0
       jmp       near ptr M02_L01
M02_L09:
       cmp       rcx,rdx
       je        near ptr M02_L02
M02_L10:
       pop       rsi
       pop       rdi
       jmp       qword ptr [7FF9A7E610C0]
; Total bytes of code 268
; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,30
       xor       eax,eax
       mov       [rsp+20],rax
       mov       rsi,rcx
       xor       edi,edi
       xor       ecx,ecx
       mov       [rsi+98],rcx
       mov       [rsi+0A0],rcx
       mov       byte ptr [rsi+2E],0
       mov       ecx,[rsi+20]
       movsxd    rax,ecx
       mov       edx,[rsi+38]
       cmp       rax,rdx
       jl        short M03_L02
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L00
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L00:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L16
       cmp       byte ptr [rsi+44],2
       jne       short M03_L01
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L01:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L17
       jmp       near ptr M03_L14
M03_L02:
       lea       rax,[rsi+30]
       cmp       ecx,[rax+8]
       jae       near ptr M03_L21
       mov       rax,[rax]
       mov       ecx,ecx
       movzx     edx,byte ptr [rax+rcx]
       cmp       edx,20
       jg        near ptr M03_L06
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBD0]
       mov       ecx,[rsi+20]
       movsxd    rdx,ecx
       mov       eax,[rsi+38]
       cmp       rdx,rax
       jl        short M03_L05
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L03
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L03:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L18
       cmp       byte ptr [rsi+44],2
       jne       short M03_L04
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L04:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L19
       jmp       near ptr M03_L14
M03_L05:
       lea       rdx,[rsi+30]
       cmp       ecx,[rdx+8]
       jae       near ptr M03_L21
       mov       rdx,[rdx]
       mov       ecx,ecx
       movzx     edx,byte ptr [rdx+rcx]
M03_L06:
       movsxd    rcx,dword ptr [rsi+20]
       mov       [rsi+18],rcx
       movzx     ebx,byte ptr [rsi+28]
       test      ebx,ebx
       je        near ptr M03_L15
       cmp       edx,2F
       jne       short M03_L08
M03_L07:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDD50]; System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L08:
       cmp       ebx,1
       jne       short M03_L10
       cmp       edx,7D
       jne       short M03_L09
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDB10]; System.Text.Json.Utf8JsonReader.EndObject()
       jmp       short M03_L13
M03_L09:
       cmp       edx,22
       jne       near ptr M03_L20
       mov       ebx,[rsi+20]
       mov       rbp,[rsi+8]
       mov       r14,[rsi]
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDC60]; System.Text.Json.Utf8JsonReader.ConsumePropertyName()
       mov       edi,eax
       test      edi,edi
       jne       short M03_L14
       mov       [rsi+20],ebx
       mov       byte ptr [rsi+28],1
       mov       [rsi+8],rbp
       mov       [rsi],r14
       jmp       short M03_L14
M03_L10:
       cmp       ebx,3
       jne       short M03_L12
       cmp       edx,5D
       jne       short M03_L11
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDB40]; System.Text.Json.Utf8JsonReader.EndArray()
       jmp       short M03_L13
M03_L11:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBE8]; System.Text.Json.Utf8JsonReader.ConsumeValue(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L12:
       cmp       ebx,5
       jne       short M03_L07
       jmp       short M03_L11
M03_L13:
       mov       edi,1
M03_L14:
       mov       eax,edi
       add       rsp,30
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
M03_L15:
       mov       rcx,rsi
       call      qword ptr [7FF9A83EDBB8]; System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L16:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L17:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L18:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L19:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FF9A8431378]
       int       3
M03_L20:
       xor       ecx,ecx
       mov       [rsp+20],rcx
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       r8d,edx
       mov       edx,0C
       call      qword ptr [7FF9A8431378]
       int       3
M03_L21:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 687

Compare Jit Disasm

; System.Text.Json.Tests.Perf_Reader.ReadReturnBytes()
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,128
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqa   xmmword ptr [rsp+20],xmm4
       mov       rax,0FFFFFFFFFFFFFF10
M00_L00:
       vmovdqa   xmmword ptr [rsp+rax+120],xmm4
       vmovdqa   xmmword ptr [rsp+rax+130],xmm4
       vmovdqa   xmmword ptr [rsp+rax+140],xmm4
       add       rax,30
       jne       short M00_L00
       mov       [rsp+120],rax
       mov       rsi,rcx
M00_L01:
       mov       rdx,[rsi+18]
       test      rdx,rdx
       je        near ptr M00_L14
       lea       rdi,[rdx+10]
       mov       ebx,[rdx+8]
M00_L02:
       mov       rdx,[rsi+10]
       test      rdx,rdx
       je        short M00_L04
       lea       rcx,[rdx+10]
       mov       r9d,[rdx+8]
M00_L03:
       xor       edx,edx
       mov       [rsp+30],rdx
       mov       [rsp+38],rdx
       mov       byte ptr [rsp+40],0
       mov       byte ptr [rsp+41],0
       mov       byte ptr [rsp+42],0
       mov       byte ptr [rsp+43],0
       mov       byte ptr [rsp+44],0
       mov       byte ptr [rsp+45],0
       mov       [rsp+48],rdx
       vxorps    xmm0,xmm0,xmm0
       vmovdqu   xmmword ptr [rsp+50],xmm0
       mov       [rsp+60],rdx
       mov       [rsp+20],rcx
       mov       [rsp+28],r9d
       lea       rdx,[rsp+20]
       lea       rcx,[rsp+68]
       lea       r9,[rsp+30]
       mov       r8d,1
       call      qword ptr [7FFA7D6ED960]; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       jmp       near ptr M00_L06
M00_L04:
       xor       ecx,ecx
       xor       r9d,r9d
       jmp       short M00_L03
M00_L05:
       movzx     ecx,byte ptr [rsp+90]
       mov       rdx,[rsp+100]
       mov       ebp,[rsp+108]
       add       ecx,0FFFFFFFB
       cmp       ecx,6
       ja        near ptr M00_L06
       mov       ecx,ecx
       lea       r8,[7FFA7D0C8F88]
       mov       r8d,[r8+rcx*4]
       lea       rax,[M00_L01]
       add       r8,rax
       jmp       r8
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FFA7D1610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       ecx,ebp
       mov       byte ptr [rdi+rcx],2C
       lea       ecx,[rbp+1]
       cmp       ecx,ebx
       jae       near ptr M00_L15
       mov       ecx,ecx
       mov       byte ptr [rdi+rcx],20
       add       ebp,2
       cmp       ebp,ebx
       ja        near ptr M00_L12
       mov       ecx,ebp
       add       rdi,rcx
       sub       ebx,ebp
       jmp       near ptr M00_L06
       mov       rcx,rdi
       cmp       ebp,ebx
       ja        near ptr M00_L11
       mov       r8d,ebp
       call      qword ptr [7FFA7D1610A8]; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       near ptr M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],54
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],72
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],75
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        near ptr M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
       jmp       short M00_L06
       test      ebx,ebx
       je        near ptr M00_L15
       mov       byte ptr [rdi],46
       cmp       ebx,1
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+1],61
       cmp       ebx,2
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+2],6C
       cmp       ebx,3
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+3],73
       cmp       ebx,4
       jbe       near ptr M00_L15
       mov       byte ptr [rdi+4],65
       cmp       ebp,ebx
       jae       near ptr M00_L15
       mov       eax,ebp
       mov       byte ptr [rdi+rax],2C
       lea       eax,[rbp+1]
       cmp       eax,ebx
       jae       near ptr M00_L15
       mov       eax,eax
       mov       byte ptr [rdi+rax],20
       lea       eax,[rbp+2]
       cmp       eax,ebx
       ja        short M00_L12
       mov       edx,eax
       add       rdx,rdi
       sub       ebx,eax
       mov       rdi,rdx
M00_L06:
       cmp       byte ptr [rsp+93],0
       jne       short M00_L07
       lea       rcx,[rsp+68]
       call      qword ptr [7FFA7D6EDB70]; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       jmp       short M00_L08
M00_L07:
       lea       rcx,[rsp+68]
       call      qword ptr [7FFA7D6EDF18]
M00_L08:
       movzx     eax,al
       test      eax,eax
       jne       short M00_L09
       cmp       byte ptr [rsp+8C],0
       je        short M00_L10
       cmp       byte ptr [rsp+90],0
       je        short M00_L13
M00_L09:
       test      eax,eax
       jne       near ptr M00_L05
M00_L10:
       mov       rax,[rsi+18]
       add       rsp,128
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       ret
M00_L11:
       call      qword ptr [7FFA7D3AD4F8]
       int       3
M00_L12:
       call      qword ptr [7FFA7D3AD4E0]
       int       3
M00_L13:
       xor       r9d,r9d
       mov       [rsp+20],r9
       xor       r9d,r9d
       mov       [rsp+28],r9d
       lea       r9,[rsp+20]
       lea       rcx,[rsp+68]
       mov       edx,20
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M00_L14:
       xor       edi,edi
       xor       ebx,ebx
       jmp       near ptr M00_L02
M00_L15:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 808
; System.Text.Json.Utf8JsonReader..ctor(System.ReadOnlySpan`1<Byte>, Boolean, System.Text.Json.JsonReaderState)
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,20
       vzeroupper
       vxorps    xmm4,xmm4,xmm4
       vmovdqu   xmmword ptr [rsp+8],xmm4
       xor       eax,eax
       mov       [rsp+18],rax
       mov       rbx,rcx
       mov       r14d,r8d
       mov       rbp,r9
       lea       rdi,[rbx+30]
       mov       rsi,rdx
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       mov       [rbx+24],r14b
       mov       byte ptr [rbx+25],0
       mov       rax,[rbp]
       mov       [rbx],rax
       mov       rax,[rbp+8]
       mov       [rbx+8],rax
       movzx     eax,byte ptr [rbp+10]
       mov       [rbx+26],al
       movzx     eax,byte ptr [rbp+11]
       mov       [rbx+27],al
       movzx     eax,byte ptr [rbp+12]
       mov       [rbx+2E],al
       movzx     eax,byte ptr [rbp+13]
       mov       [rbx+2C],al
       movzx     eax,byte ptr [rbp+14]
       mov       [rbx+28],al
       movzx     eax,byte ptr [rbp+15]
       mov       [rbx+29],al
       mov       rax,[rbp+18]
       mov       [rbx+40],rax
       cmp       dword ptr [rbx+40],0
       jne       short M01_L00
       mov       dword ptr [rbx+40],40
M01_L00:
       lea       rsi,[rbp+20]
       lea       rdi,[rbx+48]
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       movsq
       xor       eax,eax
       mov       [rbx+20],eax
       mov       [rbx+18],rax
       mov       [rbx+10],rax
       movzx     eax,byte ptr [rbx+24]
       mov       [rbx+2A],al
       mov       byte ptr [rbx+2B],0
       xor       eax,eax
       mov       [rbx+98],rax
       mov       [rbx+0A0],rax
       mov       [rbx+70],rax
       mov       [rbx+78],rax
       mov       [rbx+60],rax
       mov       [rbx+68],rax
       mov       [rbx+80],rax
       mov       [rbx+88],rax
       mov       [rbx+90],rax
       mov       byte ptr [rbx+2D],0
       mov       rax,1984AC07D50
       mov       rax,[rax]
       vmovdqu   xmm0,xmmword ptr [rax+8]
       vmovdqu   xmmword ptr [rsp+8],xmm0
       mov       rdx,[rax+18]
       mov       [rsp+18],rdx
       lea       rdi,[rbx+0A8]
       lea       rsi,[rsp+8]
       call      CORINFO_HELP_ASSIGN_BYREF
       call      CORINFO_HELP_ASSIGN_BYREF
       movsq
       add       rsp,20
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
; Total bytes of code 305
; System.Buffer.Memmove(Byte ByRef, Byte ByRef, UIntPtr)
       push      rdi
       push      rsi
       vzeroupper
       mov       rax,rcx
       sub       rax,rdx
       cmp       rax,r8
       jb        near ptr M02_L09
       mov       rax,rdx
       sub       rax,rcx
       cmp       rax,r8
       jb        near ptr M02_L09
       lea       rsi,[rdx+r8]
       lea       rdi,[rcx+r8]
       cmp       r8,10
       jbe       short M02_L05
       cmp       r8,40
       ja        short M02_L03
M02_L00:
       vmovups   xmm0,[rdx]
       vmovups   [rcx],xmm0
       cmp       r8,20
       jbe       short M02_L01
       vmovups   xmm0,[rdx+10]
       vmovups   [rcx+10],xmm0
       cmp       r8,30
       ja        near ptr M02_L08
M02_L01:
       vmovups   xmm0,[rsi-10]
       vmovups   [rdi-10],xmm0
M02_L02:
       pop       rsi
       pop       rdi
       ret
M02_L03:
       cmp       r8,800
       ja        near ptr M02_L10
       mov       rax,r8
       shr       rax,6
M02_L04:
       vmovdqu   ymm0,ymmword ptr [rdx]
       vmovdqu   ymmword ptr [rcx],ymm0
       vmovdqu   ymm0,ymmword ptr [rdx+20]
       vmovdqu   ymmword ptr [rcx+20],ymm0
       add       rcx,40
       add       rdx,40
       dec       rax
       jne       short M02_L04
       and       r8,3F
       cmp       r8,10
       ja        short M02_L00
       jmp       short M02_L01
M02_L05:
       test      r8b,18
       jne       short M02_L06
       test      r8b,4
       jne       short M02_L07
       test      r8,r8
       je        short M02_L02
       movzx     edx,byte ptr [rdx]
       mov       [rcx],dl
       test      r8b,2
       je        short M02_L02
       movsx     r8,word ptr [rsi-2]
       mov       [rdi-2],r8w
       jmp       short M02_L02
M02_L06:
       mov       rdx,[rdx]
       mov       [rcx],rdx
       mov       rcx,[rsi-8]
       mov       [rdi-8],rcx
       jmp       short M02_L02
M02_L07:
       mov       eax,[rdx]
       mov       [rcx],eax
       mov       eax,[rsi-4]
       mov       [rdi-4],eax
       jmp       near ptr M02_L02
M02_L08:
       vmovups   xmm0,[rdx+20]
       vmovups   [rcx+20],xmm0
       jmp       near ptr M02_L01
M02_L09:
       cmp       rcx,rdx
       je        near ptr M02_L02
M02_L10:
       pop       rsi
       pop       rdi
       jmp       qword ptr [7FFA7D1610C0]
; Total bytes of code 268
; System.Text.Json.Utf8JsonReader.ReadSingleSegment()
       push      r14
       push      rdi
       push      rsi
       push      rbp
       push      rbx
       sub       rsp,30
       xor       eax,eax
       mov       [rsp+20],rax
       mov       rsi,rcx
       xor       edi,edi
       xor       ecx,ecx
       mov       [rsi+98],rcx
       mov       [rsi+0A0],rcx
       mov       byte ptr [rsi+2E],0
       mov       ecx,[rsi+20]
       movsxd    rax,ecx
       mov       edx,[rsi+38]
       cmp       rax,rdx
       jl        short M03_L02
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L00
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L00:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L16
       cmp       byte ptr [rsi+44],2
       jne       short M03_L01
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L01:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L17
       jmp       near ptr M03_L14
M03_L02:
       lea       rax,[rsi+30]
       cmp       ecx,[rax+8]
       jae       near ptr M03_L21
       mov       rax,[rax]
       mov       ecx,ecx
       movzx     edx,byte ptr [rax+rcx]
       cmp       edx,20
       jg        near ptr M03_L06
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBD0]
       mov       ecx,[rsi+20]
       movsxd    rdx,ecx
       mov       eax,[rsi+38]
       cmp       rdx,rax
       jl        short M03_L05
       cmp       byte ptr [rsi+27],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+24],0
       je        near ptr M03_L14
       cmp       byte ptr [rsi+2B],0
       je        short M03_L03
       movzx     ecx,byte ptr [rsi+2A]
       test      ecx,ecx
       je        near ptr M03_L14
M03_L03:
       cmp       dword ptr [rsi+58],0
       jne       near ptr M03_L18
       cmp       byte ptr [rsi+44],2
       jne       short M03_L04
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,6
       je        near ptr M03_L14
M03_L04:
       movzx     ecx,byte ptr [rsi+28]
       cmp       ecx,4
       je        near ptr M03_L14
       cmp       ecx,2
       jne       near ptr M03_L19
       jmp       near ptr M03_L14
M03_L05:
       lea       rdx,[rsi+30]
       cmp       ecx,[rdx+8]
       jae       near ptr M03_L21
       mov       rdx,[rdx]
       mov       ecx,ecx
       movzx     edx,byte ptr [rdx+rcx]
M03_L06:
       movsxd    rcx,dword ptr [rsi+20]
       mov       [rsi+18],rcx
       movzx     ebx,byte ptr [rsi+28]
       test      ebx,ebx
       je        near ptr M03_L15
       cmp       edx,2F
       jne       short M03_L08
M03_L07:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDD50]; System.Text.Json.Utf8JsonReader.ConsumeNextTokenOrRollback(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L08:
       cmp       ebx,1
       jne       short M03_L10
       cmp       edx,7D
       jne       short M03_L09
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDB10]; System.Text.Json.Utf8JsonReader.EndObject()
       jmp       short M03_L13
M03_L09:
       cmp       edx,22
       jne       near ptr M03_L20
       mov       ebx,[rsi+20]
       mov       rbp,[rsi+8]
       mov       r14,[rsi]
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDC60]; System.Text.Json.Utf8JsonReader.ConsumePropertyName()
       mov       edi,eax
       test      edi,edi
       jne       short M03_L14
       mov       [rsi+20],ebx
       mov       byte ptr [rsi+28],1
       mov       [rsi+8],rbp
       mov       [rsi],r14
       jmp       short M03_L14
M03_L10:
       cmp       ebx,3
       jne       short M03_L12
       cmp       edx,5D
       jne       short M03_L11
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDB40]; System.Text.Json.Utf8JsonReader.EndArray()
       jmp       short M03_L13
M03_L11:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBE8]; System.Text.Json.Utf8JsonReader.ConsumeValue(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L12:
       cmp       ebx,5
       jne       short M03_L07
       jmp       short M03_L11
M03_L13:
       mov       edi,1
M03_L14:
       mov       eax,edi
       add       rsp,30
       pop       rbx
       pop       rbp
       pop       rsi
       pop       rdi
       pop       r14
       ret
M03_L15:
       mov       rcx,rsi
       call      qword ptr [7FFA7D6EDBB8]; System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte)
       mov       edi,eax
       jmp       short M03_L14
M03_L16:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L17:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L18:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,19
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L19:
       xor       edi,edi
       mov       [rsp+20],rdi
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       edx,16
       xor       r8d,r8d
       call      qword ptr [7FFA7D731378]
       int       3
M03_L20:
       xor       ecx,ecx
       mov       [rsp+20],rcx
       xor       ecx,ecx
       mov       [rsp+28],ecx
       mov       rcx,rsi
       lea       r9,[rsp+20]
       mov       r8d,edx
       mov       edx,0C
       call      qword ptr [7FFA7D731378]
       int       3
M03_L21:
       call      CORINFO_HELP_RNGCHKFAIL
       int       3
; Total bytes of code 687

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Author: performanceautofiler[bot]
Assignees: EgorBo, radekdoulik
Labels:

area-System.Text.Json, tenet-performance, tenet-performance-benchmarks, untriaged
Milestone: -

@JulieLeeMSFT JulieLeeMSFT added this to the 8.0.0 milestone Feb 14, 2023
@eiriktsarpalis
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Similar to #83398, perf numbers for this benchmark have since recovered.

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@EgorBo @eiriktsarpalis @radekdoulik @cincuranet @JulieLeeMSFT