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This commit is contained in:
Tobias Decking 2023-03-06 19:24:02 +01:00 • committed by GitHub
parent 215f63ad19
commit 73fa0deaa6
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1 changed files with 2 additions and 4 deletions
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6
library/compiler-builtins/src/mem/x86_64.rs
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@ -173,7 +173,6 @@ pub unsafe fn compare_bytes(a: *const u8, b: *const u8, n: usize) -> i32 {
c16(a.cast(), b.cast(), n)
}
// In order to process more than on byte simultaneously when executing strlen,
// two things must be considered:
// * An n byte read with an n-byte aligned address will never cross
@ -190,7 +189,7 @@ pub unsafe fn c_string_length(s: *const core::ffi::c_char) -> usize {
use core::arch::x86_64::{__m128i, _mm_cmpeq_epi8, _mm_movemask_epi8, _mm_set1_epi8};
let mut n = 0;
// The use of _mm_movemask_epi8 and company allow for speedups,
// but they aren't cheap by themselves. Thus, possibly small strings
// are handled in simple loops.
@ -266,11 +265,10 @@ pub unsafe fn c_string_length(mut s: *const core::ffi::c_char) -> usize {
if *s == 0 {
return n;
}
n += 1;
s = s.add(1);
}
// Check bytes in steps of eight until a zero
// byte is discovered.