Hal Ashburner wrote:
On Mon, 2005-12-19 at 23:40 +1100, Crossfire wrote:
The 'correct' method to test for MMX (and later extensions) is to
check the output of the CPUID instruction. (Introduced in the late
486 families - guaranteed to be available on all Pentium class or
newer systems however.) It is the CPUID instruction that the linux
kernel uses to generate most of the information in /proc/cpuinfo on
i386 systems.
cpuid is awesome!
http://www.livejournal.com/users/kernelslacker/31732.html
A small C code to check if MMX is supported in your Linux System (x86
CPU not AMD64).
#include <stdio.h>
int mmx_init__(void)
{
int MMX__;
__asm__ __volatile__ (
"movl $1, %%eax\n\t"
"cpuid\n\t"
"andl $0x800000, %%edx\n\t"
"movl %%edx, %0"
: "=q" (MMX__)
);
return MMX__;
}
int main(void)
{
if((int)mmx_init__()==0)
printf("MMX is not supported\n");
else
printf("MMX is supported\n");
return (0);
}
O Plameras
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