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go/reflect: Incorrect behavior on arm64 when using MakeFunc / Call [1.18 backport] #53397

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gopherbot opened this issue Jun 15, 2022 · 12 comments
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go/reflect: Incorrect behavior on arm64 when using MakeFunc / Call [1.18 backport] #53397

gopherbot opened this issue Jun 15, 2022 · 12 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
Milestone
Go1.18.6

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@gopherbot
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@cherrymui requested issue #52788 to be considered for backport to the next 1.18 minor release.

@gopherbot please open backport issues for previous releases. This is a miscompilation that could cause valid programs to behave incorrectly. Thanks.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Jun 15, 2022
@gopherbot gopherbot mentioned this issue Jun 15, 2022
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@gopherbot gopherbot added this to the Go1.18.4 milestone Jun 15, 2022
@joedian joedian added the CherryPickApproved Used during the release process for point releases label Jun 22, 2022
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Jun 22, 2022
@gopherbot gopherbot modified the milestones: Go1.18.4, Go1.18.5 Jul 12, 2022
@gopherbot gopherbot modified the milestones: Go1.18.5, Go1.18.6 Aug 1, 2022
@dmitshur
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dmitshur commented Aug 3, 2022

@cherrymui This request is approved, so we'll need to prepare the backport CLs.

Should we backport CL 405114 for the fix, and also the 3 followup CLs 405115, 405116, and 405553? If so, I can prepare the stack and add you as reviewer (or you can mail the CLs and make me reviewer, if that's easier).

@gopherbot
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Change https://go.dev/cl/421457 mentions this issue: [release-branch.go1.18] cmd/compile: fix If lowering on ARM64

@gopherbot
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Change https://go.dev/cl/421459 mentions this issue: [release-branch.go1.18] cmd/compile: fix boolean comparison on PPC64

@gopherbot
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Change https://go.dev/cl/421460 mentions this issue: [release-branch.go1.18] cmd/compile: fix boolean comparison on RISCV64

@gopherbot
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Change https://go.dev/cl/421458 mentions this issue: [release-branch.go1.18] cmd/compile: more fix on boolean ops on ARM64

@cherrymui
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@dmitshur yes, thanks! FYI, if these CLs are submitted in order, there will be temporary failures on PPC64 and RISCV builders, and the later CLs on the stack fix them. Thanks.

@thanm
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thanm commented Aug 8, 2022

Hi @cherrymui , I'm taking over from @dmitshur on release rotation this week. OK for me to submit these CLs this morning?

@cherrymui
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@thanm yes, okay to submit them when you're ready. No rush. Thanks.

@gopherbot
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Closed by merging e05bd75 to release-branch.go1.18.

@gopherbot
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Closed by merging 276a7bf to release-branch.go1.18.

@gopherbot
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Closed by merging 21befdc to release-branch.go1.18.

@gopherbot
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Closed by merging e1099eb to release-branch.go1.18.

gopherbot pushed a commit that referenced this issue Aug 8, 2022
@cherrymui @thanm
[release-branch.go1.18] cmd/compile: fix If lowering on ARM64
e05bd75 
On ARM64, an If block is lowered to (NZ cond yes no). This is
incorrect because cond is a boolean value and therefore only the
last byte is meaningful (same as AMD64, see ARM64Ops.go). But here
we are comparing a full register width with 0. Correct it by
comparing only the last bit.

For #52788.
Fixes #53397.

Change-Id: I2cacf9f3d2f45e149c361a290f511b2d4ed845c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/405114
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: David Chase <[email protected]>
Run-TryBot: Cherry Mui <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/421457
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Run-TryBot: Dmitri Shuralyov <[email protected]>
gopherbot pushed a commit that referenced this issue Aug 8, 2022
@cherrymui @thanm
[release-branch.go1.18] cmd/compile: more fix on boolean ops on ARM64
e1099eb 
Following CL 421457, the extension rule is also wrong. It is safe
to drop the extension if the value is from a boolean-generating
instruction, but not a boolean-typed Value in general (e.g. a Phi
or a in-register parameter). Fix it.

Updates #52788.
Updates #53397.

Change-Id: Icf3028fe8e90806f9f57fbe2b38d47da27a97e2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/405115
Reviewed-by: David Chase <[email protected]>
Run-TryBot: Cherry Mui <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/421458
Reviewed-by: Cherry Mui <[email protected]>
Run-TryBot: Dmitri Shuralyov <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
gopherbot pushed a commit that referenced this issue Aug 8, 2022
@cherrymui @thanm
[release-branch.go1.18] cmd/compile: fix boolean comparison on PPC64
276a7bf 
Following CL 421457, for PPC64.

Should fix PPC64 builds.

Updates #52788.
Updates #53397.

Change-Id: I193ac31cfba18b4f907dd2523b51368251fd6fad
Reviewed-on: https://go-review.googlesource.com/c/go/+/405116
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Cherry Mui <[email protected]>
Reviewed-by: David Chase <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/421459
Reviewed-by: Cherry Mui <[email protected]>
Run-TryBot: Dmitri Shuralyov <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
gopherbot pushed a commit that referenced this issue Aug 8, 2022
@cherrymui @thanm
[release-branch.go1.18] cmd/compile: fix boolean comparison on RISCV64
21befdc 
Following CL 421457, for RISCV64.

May fix RISCV64 builds.

Updates #52788.
Updates #53397.

Change-Id: Ifc34658703d1e8b97665e7b862060152e3005d71
Reviewed-on: https://go-review.googlesource.com/c/go/+/405553
Reviewed-by: David Chase <[email protected]>
Run-TryBot: Cherry Mui <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/421460
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Run-TryBot: Dmitri Shuralyov <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
@heschi heschi mentioned this issue Aug 19, 2022
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@dmitshur @gopherbot @thanm @cherrymui @joedian