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authorUlrich Drepper <drepper@redhat.com>1999-04-30 17:37:52 +0000
committerUlrich Drepper <drepper@redhat.com>1999-04-30 17:37:52 +0000
commitc5883607f5b138b31176de7b2664f0d217b2dbf2 (patch)
tree29a4400670e399efad0968872dd2902bb0a2e584 /sysdeps
parentad8fa1c670df9f56378682e2985f0e54057240e9 (diff)
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(__memset_gc): Help generating better code in presence of the asm.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/i386/i486/bits/string.h38
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; \
} \