Hi
This patch fixed PR 49452, thus decreased 30+ dejaGNU failures for target arm.
Tested with buildit and arm regression testing on qemu.
OK for google/gcc-4_6?
thanks
Carrot
ChangeLog
2011-09-21 Guozhi Wei <car...@google.com>
Backport r178995 from trunk.
2011-09-20 Wei Guozhi <car...@google.com>
PR rtl-optimization/49452
* postreload.c (reload_combine): Invalidate use information when
across volatile insn.
Index: postreload.c
===================================================================
--- postreload.c (revision 178989)
+++ postreload.c (working copy)
@@ -1310,7 +1310,8 @@ reload_combine (void)
is and then later disable any optimization that would cross it. */
if (LABEL_P (insn))
last_label_ruid = reload_combine_ruid;
- else if (BARRIER_P (insn))
+ else if (BARRIER_P (insn)
+ || (INSN_P (insn) && volatile_insn_p (PATTERN (insn))))
for (r = 0; r < FIRST_PSEUDO_REGISTER; r++)
if (! fixed_regs[r])
reg_state[r].use_index = RELOAD_COMBINE_MAX_USES;
--
This patch is available for review at http://codereview.appspot.com/5075046
