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optimize is_plain_ascii some more

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mat 2023-09-03 13:58:01 -05:00
parent d9e0cb390c
commit 5cd4222969
2 changed files with 30 additions and 6 deletions
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1
src/lib.rs
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@ -13,6 +13,7 @@
#![feature(portable_simd)]
#![feature(array_chunks)]
#![feature(split_array)]
mod error;
mod mutf8;

35
src/mutf8.rs
View file

@ -21,15 +21,38 @@ pub struct Mutf8String {
#[inline]
fn is_plain_ascii(slice: &[u8]) -> bool {
let mut is_plain_ascii = true;
let chunks_exact = slice.array_chunks::<32>();
for &byte in chunks_exact.remainder() {
if byte & 0b10000000 != 0 {
let chunks_32_exact = slice.array_chunks::<32>();
let mut remainder = chunks_32_exact.remainder();
if remainder.len() > 16 {
let chunk;
(chunk, remainder) = remainder.split_array_ref::<16>();
let mask = u8x16::splat(0b10000000);
let zero = u8x16::splat(0);
let simd = u8x16::from_array(*chunk);
let xor = simd & mask;
if xor != zero {
is_plain_ascii = false;
}
}
let mask = u8x32::splat(0b10000000);
let zero = u8x32::splat(0);
for &chunk in chunks_exact {
if remainder.len() > 8 {
let (chunk, remainder) = remainder.split_array_ref::<8>();
let mask = u8x8::splat(0b10000000);
let zero = u8x8::splat(0);
let simd = u8x8::from_array(*chunk);
let xor = simd & mask;
if xor != zero {
is_plain_ascii = false;
}
for &byte in remainder {
if byte & 0b10000000 != 0 {
is_plain_ascii = false;
}
}
}
for &chunk in chunks_32_exact {
let mask = u8x32::splat(0b10000000);
let zero = u8x32::splat(0);
let simd = u8x32::from_array(chunk);
let xor = simd & mask;
if xor != zero {