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ntdll: Use the unrolled memset from msvcrt. 

Although less frequently used, heap allocations are zeroed out with
ntdll memset and they don't benefit from the msvcrt memset optimisation.

Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
(cherry picked from commit a602bdd326)
Signed-off-by: Michael Stefaniuc <mstefani@winehq.org>
This commit is contained in:
Rémi Bernon 2021-10-21 10:44:30 +02:00 committed by Michael Stefaniuc
parent 6e7f753c15
commit 6d98de6889
1 changed files with 63 additions and 3 deletions
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66
dlls/ntdll/string.c
View File

@ -25,6 +25,7 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "windef.h"
#include "winbase.h"
@ -140,13 +141,72 @@ void * __cdecl memmove( void *dst, const void *src, size_t n )
}
static inline void memset_aligned_32( unsigned char *d, uint64_t v, size_t n )
{
unsigned char *end = d + n;
while (d < end)
{
*(uint64_t *)(d + 0) = v;
*(uint64_t *)(d + 8) = v;
*(uint64_t *)(d + 16) = v;
*(uint64_t *)(d + 24) = v;
d += 32;
}
}
/*********************************************************************
* memset (NTDLL.@)
*/
void * __cdecl memset( void *dst, int c, size_t n )
void *__cdecl memset( void *dst, int c, size_t n )
{
volatile unsigned char *d = dst; /* avoid gcc optimizations */
while (n--) *d++ = c;
typedef uint64_t DECLSPEC_ALIGN(1) unaligned_ui64;
typedef uint32_t DECLSPEC_ALIGN(1) unaligned_ui32;
typedef uint16_t DECLSPEC_ALIGN(1) unaligned_ui16;
uint64_t v = 0x101010101010101ull * (unsigned char)c;
unsigned char *d = (unsigned char *)dst;
size_t a = 0x20 - ((uintptr_t)d & 0x1f);
if (n >= 16)
{
*(unaligned_ui64 *)(d + 0) = v;
*(unaligned_ui64 *)(d + 8) = v;
*(unaligned_ui64 *)(d + n - 16) = v;
*(unaligned_ui64 *)(d + n - 8) = v;
if (n <= 32) return dst;
*(unaligned_ui64 *)(d + 16) = v;
*(unaligned_ui64 *)(d + 24) = v;
*(unaligned_ui64 *)(d + n - 32) = v;
*(unaligned_ui64 *)(d + n - 24) = v;
if (n <= 64) return dst;
n = (n - a) & ~0x1f;
memset_aligned_32( d + a, v, n );
return dst;
}
if (n >= 8)
{
*(unaligned_ui64 *)d = v;
*(unaligned_ui64 *)(d + n - 8) = v;
return dst;
}
if (n >= 4)
{
*(unaligned_ui32 *)d = v;
*(unaligned_ui32 *)(d + n - 4) = v;
return dst;
}
if (n >= 2)
{
*(unaligned_ui16 *)d = v;
*(unaligned_ui16 *)(d + n - 2) = v;
return dst;
}
if (n >= 1)
{
*(uint8_t *)d = v;
return dst;
}
return dst;
}