/
cputest.c
94 lines (71 loc) · 1.83 KB
/
cputest.c
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#include <stdio.h>
#include <string.h>
void CPUID(unsigned int input, unsigned int *output)
{
__asm__ __volatile__("cpuid"
: "=a" (output[0]), "=b" (output[1]), "=c" (output[2]),
"=d" (output[3])
: "a" (input));
}
int main()
{
// CPU instruction set detection routines:
// detects: SSE2, SSE3
unsigned int i;
unsigned int result[4];
char buf[20];
CPUID(0, (unsigned int*)buf);
for(i=0;i<4;i++){
char tmp = buf[8+i];
buf[8+i] = buf[12+i];
buf[12+i] = tmp;
}
buf[16] = '\0';
char is_amd = 0, is_intel = 0;
if(!strcmp(buf+4, "AuthenticAMD"))
is_amd = 1;
else if(!strcmp(buf+4, "GenuineIntel"))
is_intel = 1;
CPUID(1, result);
if(result[3] & 1) // FPU bit
printf("fpu ");
if(result[3] & (1 << 15))
printf("cmov "); // has cmovs
if(result[3] & (1 << 4))
printf("rdtsc "); // has rdtsc
if(result[3] & (1 << 23))
printf("mmx "); // mmx
if(result[3] & (1 << 25))
printf("sse "); // sse
if(is_amd){
// checks for SSE2, SSE3 support
CPUID(1, result);
if(result[3] & (1 << 26))
printf("sse2 "); // sse2
if(result[2] & 1) // ECX Bit 0
printf("ss3 ");
if(result[3] & (1 << 28))
printf("htt "); // hyperthreading
CPUID(0x80000000, result);
if(result[0] >= 0x80000001){
// has 0x80000001
CPUID(0x80000001, result);
if(result[3] & (1 << 31))
printf("3dnow ");
if(result[3] & (1 << 30))
printf("3dnowext ");
}
}
else if(is_intel){
// checks for SSE2, SSE3 support
CPUID(1, result);
if(result[3] & (1 << 26))
printf("sse2 "); // sse2
if(result[2] & 1)
printf("sse3 "); // sse3
if(result[3] & (1 << 28))
printf("htt "); // hyperthreading
}
printf("\n");
return 0;
}