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#define _UMATHMODULE
#define NPY_NO_DEPRECATED_API NPY_API_VERSION
#include <Python.h>
#include "npy_config.h"
#define PY_ARRAY_UNIQUE_SYMBOL _npy_umathmodule_ARRAY_API
#define NO_IMPORT_ARRAY
#include "cpuid.h"
#define XCR_XFEATURE_ENABLED_MASK 0x0
#define XSTATE_SSE 0x2
#define XSTATE_YMM 0x4
/*
* verify the OS supports avx instructions
* it can be disabled in some OS, e.g. with the nosavex boot option of linux
*/
static NPY_INLINE
int os_avx_support(void)
{
#if HAVE_XGETBV
/*
* use bytes for xgetbv to avoid issues with compiler not knowing the
* instruction
*/
unsigned int eax, edx;
unsigned int ecx = XCR_XFEATURE_ENABLED_MASK;
__asm__("xgetbv" : "=a" (eax), "=d" (edx) : "c" (ecx));
return (eax & (XSTATE_SSE | XSTATE_YMM)) == (XSTATE_SSE | XSTATE_YMM);
#else
return 0;
#endif
}
/*
* Primitive cpu feature detect function
* Currently only supports checking for avx on gcc compatible compilers.
*/
NPY_NO_EXPORT int
npy_cpu_supports(const char * feature)
{
#ifdef HAVE___BUILTIN_CPU_SUPPORTS
if (strcmp(feature, "avx2") == 0) {
return __builtin_cpu_supports("avx2") && os_avx_support();
}
else if (strcmp(feature, "avx") == 0) {
return __builtin_cpu_supports("avx") && os_avx_support();
}
#endif
return 0;
}
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