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msvcrt: Use unaligned data types in memset. 

This fixes a regression in memset on ARM described by Martin:
ARM can do 64 bit writes with the STRD instruction, but that
instruction requires a 32 bit aligned address - while these stores
are unaligned.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Piotr Caban 2021-09-16 13:51:58 +02:00 committed by Alexandre Julliard
parent b14ba22a2c
commit 2c01333d03
1 changed files with 18 additions and 14 deletions
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32
dlls/msvcrt/string.c
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@ -2872,21 +2872,25 @@ static inline void memset_aligned_32(unsigned char *d, uint64_t v, size_t n)
*/
void *__cdecl memset(void *dst, int c, size_t n)
{
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)
{
*(uint64_t *)(d + 0) = v;
*(uint64_t *)(d + 8) = v;
*(uint64_t *)(d + n - 16) = v;
*(uint64_t *)(d + n - 8) = v;
*(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;
*(uint64_t *)(d + 16) = v;
*(uint64_t *)(d + 24) = v;
*(uint64_t *)(d + n - 32) = v;
*(uint64_t *)(d + n - 24) = v;
*(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;
@ -2895,20 +2899,20 @@ void *__cdecl memset(void *dst, int c, size_t n)
}
if (n >= 8)
{
*(uint64_t *)d = v;
*(uint64_t *)(d + n - 8) = v;
*(unaligned_ui64 *)d = v;
*(unaligned_ui64 *)(d + n - 8) = v;
return dst;
}
if (n >= 4)
{
*(uint32_t *)d = v;
*(uint32_t *)(d + n - 4) = v;
*(unaligned_ui32 *)d = v;
*(unaligned_ui32 *)(d + n - 4) = v;
return dst;
}
if (n >= 2)
{
*(uint16_t *)d = v;
*(uint16_t *)(d + n - 2) = v;
*(unaligned_ui16 *)d = v;
*(unaligned_ui16 *)(d + n - 2) = v;
return dst;
}
if (n >= 1)