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msvcrt: Faster memcmp(). 

Signed-off-by: Jan Sikorski <jsikorski@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jan Sikorski 2022-04-19 15:53:46 +02:00 committed by Alexandre Julliard
parent 68b6e876f0
commit d5a0334b13
1 changed files with 49 additions and 6 deletions
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55
dlls/msvcrt/string.c
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@ -2675,21 +2675,64 @@ int CDECL I10_OUTPUT(MSVCRT__LDOUBLE ld80, int prec, int flag, struct _I10_OUTPU
}
#undef I10_OUTPUT_MAX_PREC
/*********************************************************************
* memcmp (MSVCRT.@)
*/
int __cdecl memcmp(const void *ptr1, const void *ptr2, size_t n)
static inline int memcmp_bytes(const void *ptr1, const void *ptr2, size_t n)
{
const unsigned char *p1, *p2;
for (p1 = ptr1, p2 = ptr2; n; n--, p1++, p2++)
{
if (*p1 < *p2) return -1;
if (*p1 > *p2) return 1;
if (*p1 != *p2)
return *p1 > *p2 ? 1 : -1;
}
return 0;
}
static inline int memcmp_blocks(const void *ptr1, const void *ptr2, size_t size)
{
typedef uint64_t DECLSPEC_ALIGN(1) unaligned_ui64;
const uint64_t *p1 = ptr1;
const unaligned_ui64 *p2 = ptr2;
size_t remainder = size & (sizeof(uint64_t) - 1);
size_t block_count = size / sizeof(uint64_t);
while (block_count)
{
if (*p1 != *p2)
return memcmp_bytes(p1, p2, sizeof(uint64_t));
p1++;
p2++;
block_count--;
}
return memcmp_bytes(p1, p2, remainder);
}
/*********************************************************************
* memcmp (MSVCRT.@)
*/
int __cdecl memcmp(const void *ptr1, const void *ptr2, size_t n)
{
const unsigned char *p1 = ptr1, *p2 = ptr2;
size_t align;
int result;
if (n < sizeof(uint64_t))
return memcmp_bytes(p1, p2, n);
align = -(size_t)p1 & (sizeof(uint64_t) - 1);
if ((result = memcmp_bytes(p1, p2, align)))
return result;
p1 += align;
p2 += align;
n -= align;
return memcmp_blocks(p1, p2, n);
}
#if defined(__i386__) || defined(__x86_64__)
#ifdef __i386__