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Fixed bug 2376 - no SDL_HasAVX

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Haneef Mubarak

AVX is the successor to SSE* and is fairly widely available. As such, it really ought to be detectable.

This functionality ought to be trivial to implement, and not having it means being forced to write an ugly workaround to check for AVX (so that normal SSE can be used if AVX is not available).

Here is an example on detecting AVX from SO (it actually shows ways to cehck for all of teh fancy instructions):

http://stackoverflow.com/questions/6121792/how-to-check-if-a-cpu-supports-the-sse3-instruction-set
This commit is contained in:
Sam Lantinga 2014-02-02 00:33:31 -08:00
parent 92cca5ee3d
commit 420a70436c
6 changed files with 45 additions and 0 deletions
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33
src/cpuinfo/SDL_cpuinfo.c
View file

@ -18,7 +18,11 @@
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#ifdef TEST_MAIN
#include "SDL_config.h"
#else
#include "../SDL_internal.h"
#endif
#if defined(__WIN32__)
#include "../core/windows/SDL_windows.h"
@ -55,6 +59,7 @@
#define CPU_HAS_SSE3 0x00000040
#define CPU_HAS_SSE41 0x00000100
#define CPU_HAS_SSE42 0x00000200
#define CPU_HAS_AVX 0x00000400
#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__
/* This is the brute force way of detecting instruction sets...
@ -329,6 +334,21 @@ CPU_haveSSE42(void)
return 0;
}
static SDL_INLINE int
CPU_haveAVX(void)
{
if (CPU_haveCPUID()) {
int a, b, c, d;
cpuid(1, a, b, c, d);
if (a >= 1) {
cpuid(1, a, b, c, d);
return (c & 0x10000000);
}
}
return 0;
}
static int SDL_CPUCount = 0;
int
@ -523,6 +543,9 @@ SDL_GetCPUFeatures(void)
if (CPU_haveSSE42()) {
SDL_CPUFeatures |= CPU_HAS_SSE42;
}
if (CPU_haveAVX()) {
SDL_CPUFeatures |= CPU_HAS_AVX;
}
}
return SDL_CPUFeatures;
}
@ -608,6 +631,15 @@ SDL_HasSSE42(void)
return SDL_FALSE;
}
SDL_bool
SDL_HasAVX(void)
{
if (SDL_GetCPUFeatures() & CPU_HAS_AVX) {
return SDL_TRUE;
}
return SDL_FALSE;
}
static int SDL_SystemRAM = 0;
int
@ -673,6 +705,7 @@ main()
printf("SSE3: %d\n", SDL_HasSSE3());
printf("SSE4.1: %d\n", SDL_HasSSE41());
printf("SSE4.2: %d\n", SDL_HasSSE42());
printf("AVX: %d\n", SDL_HasAVX());
printf("RAM: %d MB\n", SDL_GetSystemRAM());
return 0;
}