7 Mar
2005
7 Mar
'05
11:17 a.m.
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. Dave