mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-02 17:28:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Make fixes, improvements, and chibicc python bindings

Browse source 
- python now mixes audio 10x faster
- python octal notation is restored
- chibicc now builds code 3x faster
- chibicc now has help documentation
- chibicc can now generate basic python bindings
- linenoise now supports some paredit-like features

See #141
This commit is contained in:
Justine Tunney 2021-10-08 08:11:51 -07:00
parent 28997f3acb
commit 7061c79c22
121 changed files with 5272 additions and 1928 deletions
Download patch file Download diff file Expand all files Collapse all files

60
libc/str/rawmemchr.c
View file

@ -17,12 +17,39 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/str/str.h"
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;
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) {
if (*s == c) {
return s;
}
}
}
noasan static inline const char *rawmemchr_sse(const char *s, unsigned char c) {
unsigned k;
unsigned m;
xmm_t v, *p;
xmm_t n = {c, c, c, c, c, c, c, c, c, c, c, c, c, c, c, c};
k = (uintptr_t)s & 15;
p = (const xmm_t *)((uintptr_t)s & -16);
v = *p;
m = __builtin_ia32_pmovmskb128(v == n);
m >>= k;
m <<= k;
while (!m) {
v = *++p;
m = __builtin_ia32_pmovmskb128(v == n);
}
m = __builtin_ctzll(m);
return (const char *)p + m;
}
/**
@ -32,22 +59,13 @@ static inline noasan uint64_t UncheckedAlignedRead64(unsigned char *p) {
* @param c is search byte which is masked with 255
* @return is pointer to first instance of c
*/
void *rawmemchr(const void *m, int c) {
uint64_t v, w;
const unsigned char *s;
s = m;
c &= 255;
v = 0x0101010101010101ul * c;
for (; (uintptr_t)s & 7; ++s) {
if (*s == c) return s;
void *rawmemchr(const void *s, int c) {
const void *r;
if (X86_HAVE(SSE)) {
if (IsAsan()) __asan_check(s, 1);
r = rawmemchr_sse(s, c);
} else {
r = rawmemchr_pure(s, c);
}
for (;; s += 8) {
w = UncheckedAlignedRead64(s);
if ((w = ~(w ^ v) & ((w ^ v) - 0x0101010101010101) & 0x8080808080808080)) {
s += (unsigned)__builtin_ctzll(w) >> 3;
break;
}
}
assert(*s == c);
return s;
return (void *)r;
}