RE: FW: RE: x86_64 port

7 Mar 2005

      On 07 March 2005 16:18, David Brown wrote:
...
On Mon, Mar 07, 2005 at 11:47:31AM -0000, Simon Marlow wrote:
...
$ cat bug.c
register void * R1 __asm__("%r13");
extern void g(void);
static void f(void) {
 R1 = g;
 goto *R1;
}
$ gcc -S -O bug.c
$
And take a look at the generated assembly for the function f:
f:
.LFB2:
        movl    $g, %eax
        jmp     *%rax
Note that the assignment to the global variable R1 has been lost.  It
works fine on x86 though: change the register variable to %esi and
try it.
Hmm.  On gcc 3.3.5 that I have, it discards the assignment on x86 as
well.
Yes, looks like it fails with 3.4.1 and 3.4.3 I have here, but 3.2.2
works.

Now I'm quite surpised that this hasn't affected us on x86.  Very
strange.

Cheers,
	Simon