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From: "schwab@linux-m68k.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/61757] [4.10 Regression] genmodes failure with enable-checking
Date: Thu, 10 Jul 2014 10:29:00 -0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 4.10.0
X-Bugzilla-Keywords: build
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X-Bugzilla-Who: schwab@linux-m68k.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61757

--- Comment #8 from Andreas Schwab <schwab@linux-m68k.org> ---
$ diff -u gcc-201407{08,10}/Build/20030922-2.c.079t.dom1
--- gcc-20140708/Build/20030922-2.c.079t.dom1   2014-07-10 12:25:20.886372197
+0200
+++ gcc-20140710/Build/20030922-2.c.079t.dom1   2014-07-10 12:25:11.460420770
+0200
@@ -12,7 +12,6 @@
 ;; 4 succs { 5 6 }
 ;; 5 succs { 1 }
 ;; 6 succs { 1 }
-Removing basic block 4
 rgn_rank (struct rtx_def * insn1, struct rtx_def * insn2)
 {
   int * block_to_bb.0_2;
@@ -43,19 +42,25 @@
   if (_8 != _14)
     goto <bb 3>;
   else
-    goto <bb 5>;
+    goto <bb 6>;

   <bb 3>:
   target_bb.1_15 = target_bb;
   if (_14 == target_bb.1_15)
     goto <bb 4>;
   else
-    goto <bb 5>;
+    goto <bb 6>;

   <bb 4>:
-  return 1;
+  if (_8 != target_bb.1_15)
+    goto <bb 5>;
+  else
+    goto <bb 6>;

   <bb 5>:
+  return 1;
+
+  <bb 6>:
   return;

 }