On 02/16/2011 12:11 AM, kevin diggs wrote:
Hi,
Does the asm in:
#include<stdio.h>
int main(int argc, char *argv[])
{
unsigned int pc;
asm("\n\t"
"call 1f\n\t"
"1: pop %0\n"
:"=g"(pc)
);
printf(__FILE__"`%s()-%d: %%pc is %p\n",__func__,__LINE__,pc);
return 0;
}
need volatile?
Thanks!
kevin
Hey Kevin
no, you don't need the volatile keyword since the output operand (pc) is
live after the asm statement which puts a side-effect on the asm statement.
A possible way to verify the need of volatile would be to compile the
code at a high optimization level, e.g. -O3 and check the assembly code
(-S option) if the inline assembly was removed or NOT.
Best regards,
Andi
