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Make further progress on non-x86 support

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This commit is contained in:
Justine Tunney 2023-05-08 21:38:30 -07:00
parent aef9a69a60
commit 036b9a0002
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GPG key ID: BE714B4575D6E328
155 changed files with 2307 additions and 653 deletions
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27
libc/str/rawmemchr.c
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@ -22,8 +22,6 @@
#include "libc/nexgen32e/x86feature.h"
#include "libc/str/str.h"
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
static inline const unsigned char *rawmemchr_pure(const unsigned char *s,
unsigned char c) {
for (;; ++s) {
@ -34,6 +32,7 @@ static inline const unsigned char *rawmemchr_pure(const unsigned char *s,
}
#ifdef __x86_64__
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
noasan static inline const char *rawmemchr_sse(const char *s, unsigned char c) {
unsigned k;
unsigned m;
@ -54,6 +53,12 @@ noasan static inline const char *rawmemchr_sse(const char *s, unsigned char c) {
}
#endif
static inline noasan uint64_t UncheckedAlignedRead64(unsigned char *p) {
return (uint64_t)p[7] << 070 | (uint64_t)p[6] << 060 | (uint64_t)p[5] << 050 |
(uint64_t)p[4] << 040 | (uint64_t)p[3] << 030 | (uint64_t)p[2] << 020 |
(uint64_t)p[1] << 010 | (uint64_t)p[0] << 000;
}
/**
* Returns pointer to first instance of character.
*
@ -72,6 +77,22 @@ void *rawmemchr(const void *s, int c) {
}
return (void *)r;
#else
return rawmemchr_pure(s, c);
uint64_t v, w;
const unsigned char *p;
p = s;
c &= 255;
v = 0x0101010101010101ul * c;
for (; (uintptr_t)p & 7; ++p) {
if (*p == c) return p;
}
for (;; p += 8) {
w = UncheckedAlignedRead64(p);
if ((w = ~(w ^ v) & ((w ^ v) - 0x0101010101010101) & 0x8080808080808080)) {
p += (unsigned)__builtin_ctzll(w) >> 3;
break;
}
}
assert(*p == c);
return p;
#endif
}