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| author | Ulrich Drepper <drepper@redhat.com> | 1999-04-30 17:37:52 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1999-04-30 17:37:52 +0000 |
| commit | c5883607f5b138b31176de7b2664f0d217b2dbf2 (patch) | |
| tree | 29a4400670e399efad0968872dd2902bb0a2e584 /sysdeps | |
| parent | ad8fa1c670df9f56378682e2985f0e54057240e9 (diff) | |
| download | glibc-c5883607f5b138b31176de7b2664f0d217b2dbf2.tar.gz glibc-c5883607f5b138b31176de7b2664f0d217b2dbf2.tar.xz glibc-c5883607f5b138b31176de7b2664f0d217b2dbf2.zip | |
(__memset_gc): Help generating better code in presence of the asm.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/i386/i486/bits/string.h | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/sysdeps/i386/i486/bits/string.h b/sysdeps/i386/i486/bits/string.h index 136de9a199..2317d3f696 100644 --- a/sysdeps/i386/i486/bits/string.h +++ b/sysdeps/i386/i486/bits/string.h @@ -210,56 +210,56 @@ memcmp (__const void *__s1, __const void *__s2, size_t __n) #define __memset_gc(s, c, n) \ ({ void *__s = (s); \ unsigned int *__ts = (unsigned int *) __s; \ - unsigned char __c = (unsigned char) (c); \ + unsigned int __c = ((unsigned char) (c)) * 0x01010101; \ \ /* We apply a trick here. `gcc' would implement the following \ assignments using absolute operands. But this uses to much \ memory (7, instead of 4 bytes). */ \ - if (n >= 5) \ + if (n == 3 || n >= 5) \ __asm__ __volatile__ ("" : "=r" (__c) : "0" (__c)); \ \ /* This `switch' statement will be removed at compile-time. */ \ switch (n) \ { \ case 15: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 11: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 7: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 3: \ - *((unsigned short int *) __ts)++ = __c * 0x0101; \ - *((unsigned char *) __ts) = __c; \ + *((unsigned short int *) __ts)++ = (unsigned short int) __c; \ + *((unsigned char *) __ts) = (unsigned char) __c; \ break; \ \ case 14: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 10: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 6: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 2: \ - *((unsigned short int *) __ts) = __c * 0x0101; \ + *((unsigned short int *) __ts) = (unsigned short int) __c; \ break; \ \ case 13: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 9: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 5: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 1: \ - *((unsigned char *) __ts) = __c; \ + *((unsigned char *) __ts) = (unsigned char) __c; \ break; \ \ case 16: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 12: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 8: \ - *__ts++ = __c * 0x01010101; \ + *__ts++ = __c; \ case 4: \ - *__ts = __c * 0x01010101; \ + *__ts = __c; \ case 0: \ break; \ } \ |