-rw-r--r-- 1030 djbsort-20260210/skipcompilers/amd64+sse3+ssse3+sse41+sse42.c raw
#include <inttypes.h>

#ifdef __FILC__
#include <cpuid.h>
#include <stdfil.h>
#elif defined(_MSC_VER)
#include <immintrin.h>
#include <intrin.h>
#endif

static void cpuid0(uint32_t func,uint32_t *a,uint32_t *b,uint32_t *c,uint32_t *d)
{
#ifdef __FILC__
  __get_cpuid(func,a,b,c,d);
#elif defined(_MSC_VER)
  uint32_t x[4];
  __cpuid(x,func);
  *a = x[0];
  *b = x[1];
  *c = x[2];
  *d = x[3];
#else
  asm volatile("cpuid":"=a"(*a),"=b"(*b),"=c"(*c),"=d"(*d):"a"(func),"c"(0));
#endif
}

#define WANT_1_3 ((1<<23)|(1<<25)|(1<<26))
/* 23=mmx; 25=sse; 26=sse2 */

#define WANT_1_2 ((1<<0)|(1<<9)|(1<<19)|(1<<20))
/* 0=sse3; 9=ssse3; 19=sse41; 20=sse42 */

int supports(void)
{
  uint32_t cpuidmax,id0,id1,id2;
  uint32_t familymodelstepping;
  uint32_t feature1,feature2,feature3;

  cpuid0(0,&cpuidmax,&id0,&id1,&id2);
  if (cpuidmax < 1) return 0;

  cpuid0(1,&familymodelstepping,&feature1,&feature2,&feature3);
  if (WANT_1_2 != (WANT_1_2 & feature2)) return 0;
  if (WANT_1_3 != (WANT_1_3 & feature3)) return 0;

  return 1;
}