how to specify individual registers as constraints for the operands
李力
myfavor_linux at msn.com
Wed Feb 10 21:29:48 EST 2010
Dear all,
I am a newbie in this and I would like to know how to specify individual registers as constraints for the operands.
For example;
int foo(int x, int y)
{
int z = x + y;
printf("foo: x = %d y= %d\n ", x, y);
return z;
}
void call_foo(void)
{
int result;
int arg1 =1, arg2=2;
asm("foo" : "=r"(result) : "r"(arg1),"r"(arg2));
printf("call_foo result = %d\n",result);
}
How can I ask gcc to put arg1 into r0 and arg2 into r1?
please help me what to do.
Regards,
Ming
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