re PR tree-optimization/71477 (gcc ICE at -O3 on valid code on x86_64-linux-gnu with “seg fault”)

2016-06-10  Richard Biener  <rguenther@suse.de>

	PR middle-end/71477
	* cfgloop.c (alloc_loop): Initialize nb_iterations_likely_upper_bound.

	* gcc.dg/torture/pr71477.c: New testcase.

From-SVN: r237287

gcc/ChangeLog

+2016-06-10  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/71477
+	* cfgloop.c (alloc_loop): Initialize nb_iterations_likely_upper_bound.
+
 2016-06-09  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* df-problems.c (df_note_bb_compute): Guard use of DF_INSN_INFO_GET.

gcc/cfgloop.c

@@ -331,6 +331,7 @@ alloc_loop (void)
   loop->exits->next = loop->exits->prev = loop->exits;
   loop->can_be_parallel = false;
   loop->nb_iterations_upper_bound = 0;
+  loop->nb_iterations_likely_upper_bound = 0;
   loop->nb_iterations_estimate = 0;
   return loop;
 }

gcc/testsuite/ChangeLog

+2016-06-10  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/71477
+	* gcc.dg/torture/pr71477.c: New testcase.
+
 2016-06-09  Julia Koval  <julia.koval@intel.com>
 
 	* gcc.target/i386/interrupt-12.c: Fix test for -fpic and corei7.

gcc/testsuite/gcc.dg/torture/pr71477.c

+/* { dg-do compile } */
+
+#define N 6
+int a;
+void fn1()
+{
+  int k = 0;
+  for (; k < N;)
+    for (a = 0; a < N; k++)
+      a = k + N;
+}