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memset:optimizate speed. 

Signed-off-by: yangguangcai <yangguangcai@xiaomi.com>
This commit is contained in:
yangguangcai 2024-02-23 15:58:18 +08:00 committed by Xiang Xiao
parent d6cd95313d
commit f44232b7a8
1 changed files with 28 additions and 0 deletions
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28
libs/libc/string/lib_memset.c
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@ -95,6 +95,18 @@ FAR void *memset(FAR void *s, int c, size_t n)
} }
#ifndef CONFIG_MEMSET_64BIT #ifndef CONFIG_MEMSET_64BIT
/* Loop while there are at least 16-bytes left to be written */
while (n >= 16)
{
*(FAR uint32_t *)(addr + 0) = val32;
*(FAR uint32_t *)(addr + 4) = val32;
*(FAR uint32_t *)(addr + 8) = val32;
*(FAR uint32_t *)(addr + 12) = val32;
addr += 16;
n -= 16;
}
/* Loop while there are at least 32-bits left to be written */ /* Loop while there are at least 32-bits left to be written */
while (n >= 4) while (n >= 4)
@ -119,6 +131,22 @@ FAR void *memset(FAR void *s, int c, size_t n)
n -= 4; n -= 4;
} }
/* Loop while there are at least 64-bytes left to be written */
while (n >= 64)
{
*(FAR uint64_t *)(addr + 0) = val64;
*(FAR uint64_t *)(addr + 8) = val64;
*(FAR uint64_t *)(addr + 16) = val64;
*(FAR uint64_t *)(addr + 24) = val64;
*(FAR uint64_t *)(addr + 32) = val64;
*(FAR uint64_t *)(addr + 40) = val64;
*(FAR uint64_t *)(addr + 48) = val64;
*(FAR uint64_t *)(addr + 56) = val64;
addr += 64;
n -= 64;
}
/* Loop while there are at least 64-bits left to be written */ /* Loop while there are at least 64-bits left to be written */
while (n >= 8) while (n >= 8)