mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
2ab9e9f7fd
- 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
64 lines
2.8 KiB
C
64 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/str/str.h"
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#ifndef __aarch64__
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typedef char xmm_u __attribute__((__vector_size__(16), __aligned__(1)));
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typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
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/**
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* Copies bytes from 𝑠 to 𝑑 until a NUL is encountered.
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*
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* @param 𝑑 is destination memory
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* @param 𝑠 is a NUL-terminated string
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* @note 𝑑 and 𝑠 can't overlap
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* @return pointer to nul byte
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* @asyncsignalsafe
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*/
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__vex char *stpcpy(char *d, const char *s) {
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size_t i = 0;
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#if defined(__x86_64__) && !defined(__chibicc__)
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for (; (uintptr_t)(s + i) & 15; ++i) {
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if (!(d[i] = s[i])) {
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return d + i;
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}
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}
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for (;;) {
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xmm_t z = {0};
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xmm_t v = *(xmm_t *)(s + i);
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if (!__builtin_ia32_pmovmskb128(v == z)) {
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*(xmm_u *)(d + i) = v;
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i += 16;
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} else {
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break;
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}
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}
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#endif
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for (;;) {
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if (!(d[i] = s[i])) {
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return d + i;
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}
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++i;
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}
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}
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#endif /* __aarch64__ */
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