kotovalexarian-likes-gitlab/sortix--sortix
1
0
Fork 0
mirror of https://gitlab.com/sortix/sortix.git synced 2023-02-13 20:55:38 -05:00
Code Releases Activity

More efficient memcpy(3) for aligned data.

Browse source
This commit is contained in:
Jonas 'Sortie' Termansen 2012-05-27 14:07:23 +02:00
parent 00869bcdc1
commit e8d75643ea
1 changed files with 31 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

37
libmaxsi/memory.cpp
View file

@ -66,16 +66,41 @@ namespace Maxsi
}
#endif
DUAL_FUNCTION(void*, memcpy, Copy, (void* Dest, const void* Src, size_t Length))
extern "C" void* memcpy_aligned(unsigned long* dest,
const unsigned long* src,
size_t length)
{
char* D = (char*) Dest; const char* S = (const char*) Src;
for ( size_t I = 0; I < Length; I++ )
size_t numcopies = length / sizeof(unsigned long);
for ( size_t i = 0; i < numcopies; i++ )
{
D[I] = S[I];
dest[i] = src[i];
}
return dest;
}
return Dest;
static inline bool IsWordAligned(uintptr_t addr)
{
const size_t WORDSIZE = sizeof(unsigned long);
return (addr / WORDSIZE * WORDSIZE) == addr;
}
DUAL_FUNCTION(void*, memcpy, Copy, (void* destptr, const void* srcptr, size_t length))
{
if ( IsWordAligned((uintptr_t) destptr) &&
IsWordAligned((uintptr_t) srcptr) &&
IsWordAligned(length) )
{
unsigned long* dest = (unsigned long*) destptr;
const unsigned long* src = (const unsigned long*) srcptr;
return memcpy_aligned(dest, src, length);
}
uint8_t* dest = (uint8_t*) destptr;
const uint8_t* src = (const uint8_t*) srcptr;
for ( size_t i = 0; i < length; i += sizeof(uint8_t) )
{
dest[i] = src[i];
}
return dest;
}
DUAL_FUNCTION(void*, memset, Set, (void* Dest, int Value, size_t Length))