diff options
| author | Jukka Jylänki <jujjyl@gmail.com> | 2014-03-16 03:53:58 +0200 |
|---|---|---|
| committer | Jukka Jylänki <jujjyl@gmail.com> | 2014-03-28 23:06:17 -0400 |
| commit | f546d9a039d8b1ead4f6b5843e97faf8b4944a70 (patch) | |
| tree | aff1cc6e5908752d605f10bcb83af5929d4fcb96 /system/lib | |
| parent | d468544eec5b4900228a19b5af1fa0d051e736ac (diff) | |
Migrate to using musl 0.9.13 memchr for better asm.js performance.
Diffstat (limited to 'system/lib')
| -rw-r--r-- | system/lib/libc/musl/src/string/memchr.c | 24 | ||||
| -rw-r--r-- | system/lib/libcextra.symbols | 1 |
2 files changed, 25 insertions, 0 deletions
diff --git a/system/lib/libc/musl/src/string/memchr.c b/system/lib/libc/musl/src/string/memchr.c new file mode 100644 index 00000000..a0472f78 --- /dev/null +++ b/system/lib/libc/musl/src/string/memchr.c @@ -0,0 +1,24 @@ +#include <string.h> +#include <stdlib.h> +#include <stdint.h> +#include <limits.h> + +#define SS (sizeof(size_t)) +#define ALIGN (sizeof(size_t)-1) +#define ONES ((size_t)-1/UCHAR_MAX) +#define HIGHS (ONES * (UCHAR_MAX/2+1)) +#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) + +void *memchr(const void *src, int c, size_t n) +{ + const unsigned char *s = src; + c = (unsigned char)c; + for (; ((uintptr_t)s & ALIGN) && n && *s != c; s++, n--); + if (n && *s != c) { + const size_t *w; + size_t k = ONES * c; + for (w = (const void *)s; n>=SS && !HASZERO(*w^k); w++, n-=SS); + for (s = (const void *)w; n && *s != c; s++, n--); + } + return n ? (void *)s : 0; +} diff --git a/system/lib/libcextra.symbols b/system/lib/libcextra.symbols index 30a39d52..94cd79be 100644 --- a/system/lib/libcextra.symbols +++ b/system/lib/libcextra.symbols @@ -92,6 +92,7 @@ T mbstowcs T mbtowc T memccpy + T memchr T memmem T mempcpy W memrchr |