Re: Inline ASM and stack/base pointer

[Daniel Mierswa <impulze at impulze dot org>]

On 09.06.2011 20:02, Paul Römer wrote:
> Hi,
> 
> What happens if you compile only with -fomit-frame-pointer? I'm not sure
> if it will be activated without adding an -Ox option. Can you add an
> example code?
impulze@istari ~ $ gcc-4.4 -S -fomit-frame-pointer test.c && grep -m1
lea test.s
	lea 12(%esp), %edi
impulze@istari ~ $ gcc-4.5 -S -fomit-frame-pointer test.c && grep -m1
lea test.s
	lea 12(%esp), %edi
impulze@istari ~ $ gcc-4.6 -S -fomit-frame-pointer test.c && grep -m1
lea test.s
	lea 12(%esp), %edi
impulze@istari ~ $ cat test.c
void f()
{
    int i;
    __asm__ __volatile__("lea %0, %%edi\n"::"m"(i):"%esp");
}

> What gcc you use?
4.4.5, 4.5.2, 4.6.0

-- 
Mierswa, Daniel

If you still don't like it, that's ok: that's why I'm boss. I simply
know better than you do.
               --- Linus Torvalds, comp.os.linux.advocacy, 1996/07/22