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alpha ifcvt crash
- To: gcc-patches at gcc dot gnu dot org
- Subject: alpha ifcvt crash
- From: Richard Henderson <rth at cygnus dot com>
- Date: Fri, 19 May 2000 13:09:13 -0700
Bad things happen when you try to merge EXIT with something else. ;-)
r~
* ifcvt.c (find_if_case_2): Don't allow THEN to be EXIT.
Index: ifcvt.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/ifcvt.c,v
retrieving revision 1.16
diff -u -p -d -r1.16 ifcvt.c
--- ifcvt.c 2000/05/16 06:21:04 1.16
+++ ifcvt.c 2000/05/19 20:04:44
@@ -1652,14 +1652,17 @@ find_if_case_2 (test_bb, then_edge, else
if (else_bb->pred->pred_next != NULL)
return FALSE;
+ /* THEN is not EXIT. */
+ if (then_bb->index < 0)
+ return FALSE;
+
/* ELSE is predicted or SUCC(ELSE) postdominates THEN. */
note = find_reg_note (test_bb->end, REG_BR_PROB, NULL_RTX);
if (note && INTVAL (XEXP (note, 0)) >= REG_BR_PROB_BASE / 2)
;
else if (else_succ->dest->index < 0
- || (then_bb->index >= 0
- && TEST_BIT (post_dominators[ORIG_INDEX (then_bb)],
- ORIG_INDEX (else_succ->dest))))
+ || TEST_BIT (post_dominators[ORIG_INDEX (then_bb)],
+ ORIG_INDEX (else_succ->dest)))
;
else
return FALSE;