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- Introduce portable sched_getcpu() api
- Support GCC's __target_clones__ feature
- Make fma() go faster on x86 in default mode
- Remove some asan checks from core libraries
- WinMain() now ensures $HOME and $USER are defined
This commit is contained in:
Justine Tunney 2024-02-01 03:39:46 -08:00
parent d5225a693b
commit 2ab9e9f7fd
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GPG key ID: BE714B4575D6E328
192 changed files with 2809 additions and 932 deletions
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5
libc/str/strlen16.c
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@ -17,7 +17,6 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/str/str.h"
typedef char16_t xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
@ -29,17 +28,15 @@ typedef char16_t xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
* @return number of shorts (excluding NUL)
* @asyncsignalsafe
*/
size_t strlen16(const char16_t *s) {
__vex size_t strlen16(const char16_t *s) {
#if defined(__x86_64__) && !defined(__chibicc__)
size_t n;
xmm_t z = {0};
unsigned m, k = (uintptr_t)s & 15;
const xmm_t *p = (const xmm_t *)((uintptr_t)s & -16);
if (IsAsan()) __asan_verify(s, 2);
m = __builtin_ia32_pmovmskb128(*p == z) >> k << k;
while (!m) m = __builtin_ia32_pmovmskb128(*++p == z);
n = (const char16_t *)p + (__builtin_ctzl(m) >> 1) - s;
if (IsAsan()) __asan_verify(s, n * 2);
return n;
#else
size_t n = 0;