Dear All,
I have a problem with the following simple code when use Sun Studio C 12 upd. 1:
-------------------------
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
void my_cpuid(uint32_t toAX, uint32_t * myEAX, uint32_t * myEBX, uint32_t *
myECX, uint32_t * myEDX)
{
#define CPUID ".byte 0x0f, 0xa2; "
__asm__ __volatile__ ("mov %%rbx, %%rsi\n\t"
CPUID"\n\t"
"xchg %%rsi, %%rbx\n\t"
: "=a" (*myEAX), "=S" (*myEBX), "=c" (*myECX), "=d"
(*myEDX)
: "a" (toAX));
}
int main(void)
{
uint32_t myEAX=0, myEBX=0, myECX=0, myEDX=0;
uint32_t reg[4];
char vendor[100];
my_cpuid(0, &myEAX, &myEBX, &myECX, &myEDX);
reg[0] = myEBX;
reg[1] = myEDX;
reg[2] = myECX;
reg[3] = 0;
strcpy(vendor, (char*)reg);
printf("%s\n", vendor);
return(0);
}
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When I use gcc-4.3.2, it prints "GenuineIntel" as expected on my Intel CPU.
But when I use SunStudio 12 upd. 1, it prints nothing.
Here are the compile commands:
gcc-4.3.2 -m64 -march=core2 test.c
and
cc -m64 -xarch=sse4_1 -xchip=core2 test.c
My OS and CPU are OpenSolaris 2009.06 and Intel Core2 Quad.
This is a pretty standard code. What can be wrong with it?
It should be also noted that if I place _asm_ code directly into the main
function then everything works fine.
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