This patch fixes the compiler segfault found while regtesting trunk with SMS on
IA64 platform. Segfault happens on test gcc.dg/pr45259.c with -fmodulo-sched
enabled. The following jump instruction is given as argument for
doloop_condition_get function:
(jump_insn 86 85 88 7 (set (pc)
(reg/f:DI 403)) 339 {indirect_jump}
(expr_list:REG_DEAD (reg/f:DI 403)
(nil)))
The patch adds checking for the form of comparison instruction before
extracting loop exit condition.
2011-07-20 Roman Zhuykov <[email protected]>
* loop-doloop.c (doloop_condition_get): Correctly check
the form of comparison instruction.
---
gcc/loop-doloop.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/gcc/loop-doloop.c b/gcc/loop-doloop.c
index f8429c4..dfc4a16 100644
--- a/gcc/loop-doloop.c
+++ b/gcc/loop-doloop.c
@@ -153,6 +153,8 @@ doloop_condition_get (rtx doloop_pat)
else
inc = PATTERN (prev_insn);
/* We expect the condition to be of the form (reg != 0) */
+ if (GET_CODE (cmp) != SET || GET_CODE (SET_SRC (cmp)) != IF_THEN_ELSE)
+ return 0;
cond = XEXP (SET_SRC (cmp), 0);
if (GET_CODE (cond) != NE || XEXP (cond, 1) != const0_rtx)
return 0;
--
Roman Zhuykov
[email protected]
