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