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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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42
libc/str/strchrnul.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 char *strchrnul_pure(const char *s, int c) {
for (;; ++s) {
if ((*s & 255) == (c & 255)) return s;
@ -32,6 +30,7 @@ static inline const char *strchrnul_pure(const char *s, int c) {
}
#ifdef __x86_64__
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
noasan static inline const char *strchrnul_sse(const char *s, unsigned char c) {
unsigned k;
unsigned m;
@ -52,6 +51,36 @@ noasan static inline const char *strchrnul_sse(const char *s, unsigned char c) {
}
#endif
noasan static const char *strchrnul_x64(const char *p, uint64_t c) {
unsigned a, b;
uint64_t w, x, y;
for (c *= 0x0101010101010101;; p += 8) {
w = (uint64_t)(255 & p[7]) << 070 | (uint64_t)(255 & p[6]) << 060 |
(uint64_t)(255 & p[5]) << 050 | (uint64_t)(255 & p[4]) << 040 |
(uint64_t)(255 & p[3]) << 030 | (uint64_t)(255 & p[2]) << 020 |
(uint64_t)(255 & p[1]) << 010 | (uint64_t)(255 & p[0]) << 000;
if ((x = ~(w ^ c) & ((w ^ c) - 0x0101010101010101) & 0x8080808080808080) |
(y = ~w & (w - 0x0101010101010101) & 0x8080808080808080)) {
if (x) {
a = __builtin_ctzll(x);
if (y) {
b = __builtin_ctzll(y);
if (a <= b) {
return p + (a >> 3);
} else {
return p + (b >> 3);
}
} else {
return p + (a >> 3);
}
} else {
b = __builtin_ctzll(y);
return p + (b >> 3);
}
}
}
}
/**
* Returns pointer to first instance of character.
*
@ -74,6 +103,13 @@ char *strchrnul(const char *s, int c) {
_unassert((*r & 255) == (c & 255) || !*r);
return (char *)r;
#else
return strchrnul_pure(s, c);
char *r;
for (c &= 255; (uintptr_t)s & 7; ++s) {
if ((*s & 0xff) == c) return s;
if (!*s) return s;
}
r = strchrnul_x64(s, c);
assert((*r & 255) == c || !*r);
return r;
#endif
}