janwas
78d950e419
win_internal -> win.h (pulls in <windows.h>, with fixes afterwards) remove empty waio_internal and wsysdep Move source/sound license notice into source/sound/license.txt This was SVN commit r5044.
33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
/**
|
|
* =========================================================================
|
|
* File : ia32_memcpy_init.cpp
|
|
* Project : 0 A.D.
|
|
* Description : initialization for ia32_memcpy (detect CPU caps)
|
|
* =========================================================================
|
|
*/
|
|
|
|
// license: GPL; see lib/license.txt
|
|
|
|
#include "precompiled.h"
|
|
|
|
#include "ia32.h"
|
|
#include "ia32_memcpy.h"
|
|
|
|
// set by ia32_memcpy_init, referenced by ia32_memcpy (asm)
|
|
// default to "all codepaths supported"
|
|
EXTERN_C u32 ia32_memcpy_size_mask = ~0u;
|
|
|
|
void ia32_memcpy_init()
|
|
{
|
|
// set the mask that is applied to transfer size before
|
|
// choosing copy technique. this is the mechanism for disabling
|
|
// codepaths that aren't supported on all CPUs; see article for details.
|
|
// .. check for PREFETCHNTA and MOVNTQ support. these are part of the SSE
|
|
// instruction set, but also supported on older Athlons as part of
|
|
// the extended AMD MMX set.
|
|
if(!ia32_cap(IA32_CAP_SSE) && !ia32_cap(IA32_CAP_AMD_MMX_EXT))
|
|
ia32_memcpy_size_mask = 0u;
|
|
}
|
|
|
|
// ia32_memcpy() is defined in ia32_memcpy_asm.asm
|