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Minor tweaks to memset

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5245 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2012-10-21 05:38:24 +00:00
parent 5200c2844e
commit e924c5a0b8
4 changed files with 35 additions and 36 deletions
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lib/string/lib_memset.c
+21 -28
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@@ -92,7 +92,7 @@ void *memset(void *s, int c, size_t n)
n -= 1;
}
/* Check if there are at least 16-bits left to be zeroed */
/* Check if there are at least 16-bits left to be written */
if (n >= 2)
{
@@ -108,7 +108,7 @@ void *memset(void *s, int c, size_t n)
}
#ifndef CONFIG_MEMSET_64BIT
/* Loop while there are at least 32-bits left to be zeroed */
/* Loop while there are at least 32-bits left to be written */
while (n >= 4)
{
@@ -117,7 +117,7 @@ void *memset(void *s, int c, size_t n)
n -= 4;
}
#else
/* Check if there are at least 32-bits left to be zeroed */
/* Check if there are at least 32-bits left to be written */
if (n >= 4)
{
@@ -132,7 +132,7 @@ void *memset(void *s, int c, size_t n)
n -= 4;
}
/* Loop while there are at least 64-bits left to be zeroed */
/* Loop while there are at least 64-bits left to be written */
while (n >= 8)
{
@@ -145,16 +145,16 @@ void *memset(void *s, int c, size_t n)
}
#ifdef CONFIG_MEMSET_64BIT
/* We may get here with n in the range 0..7. If n >= 4, then we should
* have 64-bit alignment.
*/
/* We may get here with n in the range 0..7. If n >= 4, then we should
* have 64-bit alignment.
*/
if (n >= 4)
{
*(uint32_t*)addr = val32;
addr += 4;
n -= 4;
}
if (n >= 4)
{
*(uint32_t*)addr = val32;
addr += 4;
n -= 4;
}
#endif
/* We may get here under the following conditions:
@@ -165,23 +165,16 @@ void *memset(void *s, int c, size_t n)
* n = 3, addr is aligned to a 32-bit boundary
*/
switch (n)
if (n >= 2)
{
default:
case 0:
DEBUGASSERT(n == 0);
break;
*(uint16_t*)addr = val16;
addr += 2;
n -= 2;
}
case 2:
*(uint16_t*)addr = val16;
break;
case 3:
*(uint16_t*)addr = val16;
addr += 2;
case 1:
*(uint8_t*)addr = (uint8_t)c;
break;
if (n >= 1)
{
*(uint8_t*)addr = (uint8_t)c;
}
}
#else