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Don't use movs in memcpy as it causes performance loss.

This commit is contained in:
Jonas 'Sortie' Termansen 2012-12-15 22:40:56 +01:00
parent d04592acf0
commit 6a44dcae04
1 changed files with 2 additions and 0 deletions
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2
libc/memcpy.cpp
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@ -91,6 +91,7 @@ extern "C" void* memcpy(void* restrict dstptr, const void* restrict srcptr,
} }
size_t numcopies = length / sizeof(unsigned long); size_t numcopies = length / sizeof(unsigned long);
#if 0
#if defined(__x86_64__) || defined(__i386__) #if defined(__x86_64__) || defined(__i386__)
unsigned long zeroed_numcopies; unsigned long zeroed_numcopies;
#if defined(__x86_64__) #if defined(__x86_64__)
@ -102,6 +103,7 @@ extern "C" void* memcpy(void* restrict dstptr, const void* restrict srcptr,
: "c"(numcopies), "S"(srcul), "D"(dstul) : "c"(numcopies), "S"(srcul), "D"(dstul)
: "memory"); : "memory");
#endif #endif
#endif
#else #else
for ( size_t i = 0; i < numcopies; i++ ) for ( size_t i = 0; i < numcopies; i++ )
*dstul++ = *srcul++; *dstul++ = *srcul++;