------- Comment #5 from rguenth at gcc dot gnu dot org 2010-02-23 11:51 -------
(In reply to comment #4)
> Can't reproduce this, at least not with a cross gcc (and -m32 -msecure-plt -O2
> -fPIC), on neither the original nor the reduced testcase.
Ok, there's a single ppc specific patch in our tree carried over from 4.1.
Maybe it's finally time to investigate why it's still there and if that is
the cause for this problem:
2005-11-28 Jakub Jelinek <ja...@redhat.com>
* config/rs6000/rs6000.c (rs6000_return_addr): If COUNT == 0,
read word RETURN_ADDRESS_OFFSET bytes above arg_pointer_rtx
instead of doing an extran indirection from frame_pointer_rtx.
* gcc.dg/20051128-1.c: New test.
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c.orig 2009-10-26 11:13:21.000000000 +0100
+++ gcc/config/rs6000/rs6000.c 2009-11-18 14:59:12.000000000 +0100
@@ -17526,17 +17526,22 @@ rs6000_return_addr (int count, rtx frame
don't try to be too clever here. */
if (count != 0 || (DEFAULT_ABI != ABI_AIX && flag_pic))
{
+ rtx x;
cfun->machine->ra_needs_full_frame = 1;
- return
- gen_rtx_MEM
- (Pmode,
- memory_address
- (Pmode,
- plus_constant (copy_to_reg
- (gen_rtx_MEM (Pmode,
- memory_address (Pmode, frame))),
- RETURN_ADDRESS_OFFSET)));
+ if (count == 0)
+ {
+ gcc_assert (frame == frame_pointer_rtx);
+ x = arg_pointer_rtx;
+ }
+ else
+ {
+ x = memory_address (Pmode, frame);
+ x = copy_to_reg (gen_rtx_MEM (Pmode, x));
+ }
+
+ x = plus_constant (x, RETURN_ADDRESS_OFFSET);
+ return gen_rtx_MEM (Pmode, memory_address (Pmode, x));
}
cfun->machine->ra_need_lr = 1;
I'm also trying to reproduce it with a plain trunk cross-compiler.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43142
