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Merge pull request #82 from llogiq/aarch64
Add aarch64 SIMD specialization
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Original file line number | Diff line number | Diff line change |
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@@ -22,6 +22,7 @@ jobs: | |
arch: | ||
- i686 | ||
- x86_64 | ||
- aarch64 | ||
features: | ||
- default | ||
- runtime-dispatch-simd | ||
|
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,157 @@ | ||
use core::arch::aarch64::{ | ||
uint8x16_t, uint8x16x4_t, vaddlvq_u8, vandq_u8, vceqq_u8, vdupq_n_u8, vld1q_u8, vld1q_u8_x4, | ||
vmvnq_u8, vsubq_u8, | ||
}; | ||
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||
const MASK: [u8; 32] = [ | ||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, | ||
255, 255, 255, 255, 255, 255, 255, | ||
]; | ||
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||
#[target_feature(enable = "neon")] | ||
unsafe fn u8x16_from_offset(slice: &[u8], offset: usize) -> uint8x16_t { | ||
debug_assert!( | ||
offset + 16 <= slice.len(), | ||
"{} + 16 ≥ {}", | ||
offset, | ||
slice.len() | ||
); | ||
vld1q_u8(slice.as_ptr().add(offset) as *const _) // TODO: does this need to be aligned? | ||
} | ||
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#[target_feature(enable = "neon")] | ||
unsafe fn u8x16_x4_from_offset(slice: &[u8], offset: usize) -> uint8x16x4_t { | ||
debug_assert!( | ||
offset + 64 <= slice.len(), | ||
"{} + 64 ≥ {}", | ||
offset, | ||
slice.len() | ||
); | ||
vld1q_u8_x4(slice.as_ptr().add(offset) as *const _) | ||
} | ||
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#[target_feature(enable = "neon")] | ||
unsafe fn sum(u8s: uint8x16_t) -> usize { | ||
vaddlvq_u8(u8s) as usize | ||
} | ||
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#[target_feature(enable = "neon")] | ||
pub unsafe fn chunk_count(haystack: &[u8], needle: u8) -> usize { | ||
assert!(haystack.len() >= 16); | ||
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let mut offset = 0; | ||
let mut count = 0; | ||
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let needles = vdupq_n_u8(needle); | ||
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// 16320 | ||
while haystack.len() >= offset + 64 * 255 { | ||
let (mut count1, mut count2, mut count3, mut count4) = | ||
(vdupq_n_u8(0), vdupq_n_u8(0), vdupq_n_u8(0), vdupq_n_u8(0)); | ||
for _ in 0..255 { | ||
let uint8x16x4_t(h1, h2, h3, h4) = u8x16_x4_from_offset(haystack, offset); | ||
count1 = vsubq_u8(count1, vceqq_u8(h1, needles)); | ||
count2 = vsubq_u8(count2, vceqq_u8(h2, needles)); | ||
count3 = vsubq_u8(count3, vceqq_u8(h3, needles)); | ||
count4 = vsubq_u8(count4, vceqq_u8(h4, needles)); | ||
offset += 64; | ||
} | ||
count += sum(count1) + sum(count2) + sum(count3) + sum(count4); | ||
} | ||
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||
// 64 | ||
let (mut count1, mut count2, mut count3, mut count4) = | ||
(vdupq_n_u8(0), vdupq_n_u8(0), vdupq_n_u8(0), vdupq_n_u8(0)); | ||
for _ in 0..(haystack.len() - offset) / 64 { | ||
let uint8x16x4_t(h1, h2, h3, h4) = u8x16_x4_from_offset(haystack, offset); | ||
count1 = vsubq_u8(count1, vceqq_u8(h1, needles)); | ||
count2 = vsubq_u8(count2, vceqq_u8(h2, needles)); | ||
count3 = vsubq_u8(count3, vceqq_u8(h3, needles)); | ||
count4 = vsubq_u8(count4, vceqq_u8(h4, needles)); | ||
offset += 64; | ||
} | ||
count += sum(count1) + sum(count2) + sum(count3) + sum(count4); | ||
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let mut counts = vdupq_n_u8(0); | ||
// 16 | ||
for i in 0..(haystack.len() - offset) / 16 { | ||
counts = vsubq_u8( | ||
counts, | ||
vceqq_u8(u8x16_from_offset(haystack, offset + i * 16), needles), | ||
); | ||
} | ||
if haystack.len() % 16 != 0 { | ||
counts = vsubq_u8( | ||
counts, | ||
vandq_u8( | ||
vceqq_u8(u8x16_from_offset(haystack, haystack.len() - 16), needles), | ||
u8x16_from_offset(&MASK, haystack.len() % 16), | ||
), | ||
); | ||
} | ||
count + sum(counts) | ||
} | ||
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#[target_feature(enable = "neon")] | ||
unsafe fn is_leading_utf8_byte(u8s: uint8x16_t) -> uint8x16_t { | ||
vmvnq_u8(vceqq_u8( | ||
vandq_u8(u8s, vdupq_n_u8(0b1100_0000)), | ||
vdupq_n_u8(0b1000_0000), | ||
)) | ||
} | ||
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#[target_feature(enable = "neon")] | ||
pub unsafe fn chunk_num_chars(utf8_chars: &[u8]) -> usize { | ||
assert!(utf8_chars.len() >= 16); | ||
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let mut offset = 0; | ||
let mut count = 0; | ||
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// 4080 | ||
while utf8_chars.len() >= offset + 16 * 255 { | ||
let mut counts = vdupq_n_u8(0); | ||
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for _ in 0..255 { | ||
counts = vsubq_u8( | ||
counts, | ||
is_leading_utf8_byte(u8x16_from_offset(utf8_chars, offset)), | ||
); | ||
offset += 16; | ||
} | ||
count += sum(counts); | ||
} | ||
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// 2048 | ||
if utf8_chars.len() >= offset + 16 * 128 { | ||
let mut counts = vdupq_n_u8(0); | ||
for _ in 0..128 { | ||
counts = vsubq_u8( | ||
counts, | ||
is_leading_utf8_byte(u8x16_from_offset(utf8_chars, offset)), | ||
); | ||
offset += 16; | ||
} | ||
count += sum(counts); | ||
} | ||
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// 16 | ||
let mut counts = vdupq_n_u8(0); | ||
for i in 0..(utf8_chars.len() - offset) / 16 { | ||
counts = vsubq_u8( | ||
counts, | ||
is_leading_utf8_byte(u8x16_from_offset(utf8_chars, offset + i * 16)), | ||
); | ||
} | ||
if utf8_chars.len() % 16 != 0 { | ||
counts = vsubq_u8( | ||
counts, | ||
vandq_u8( | ||
is_leading_utf8_byte(u8x16_from_offset(utf8_chars, utf8_chars.len() - 16)), | ||
u8x16_from_offset(&MASK, utf8_chars.len() % 16), | ||
), | ||
); | ||
} | ||
count += sum(counts); | ||
|
||
count | ||
} |
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