re PR tree-optimization/47060 (ICE: SIGSEGV in reduction_phi…

re PR tree-optimization/47060 (ICE: SIGSEGV in reduction_phi (tree-parloops.c:212) with -O -ffast-math -ftree-parallelize-loops=2 -fno-tree-dce)

	PR tree-optimization/47060
	* tree-parloops.c (reduction_phi): Return NULL if PHI is NULL.

	* gcc.dg/autopar/pr47060.c: New test.

From-SVN: r168336

gcc/ChangeLog

+2010-12-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/47060
+	* tree-parloops.c (reduction_phi): Return NULL if PHI is NULL.
+
 2010-12-29  Paul Koning  <ni1d@arrl.net>
 
 	* config/pdp11/pdp11-protos.h (pdp11_asm_output_var): Declare.

gcc/testsuite/ChangeLog

+2010-12-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/47060
+	* gcc.dg/autopar/pr47060.c: New test.
+
 2010-12-30  Nicola Pero  <nicola.pero@meta-innovation.com>
 
 	* objc.dg/enhanced-proto-2.m: Updated.

gcc/testsuite/gcc.dg/autopar/pr47060.c

+/* PR tree-optimization/47060 */
+/* { dg-do compile } */
+/* { dg-options "-O -ffast-math -ftree-parallelize-loops=2 -fno-tree-dce" } */
+
+struct S
+{
+  int n;
+  float *a;
+};
+
+float
+foo (struct S *b)
+{
+  float c, d;
+  int j;
+  for (j = 0; j < b->n; j++)
+    d += b->a[j];
+  for (j = 0; j < b->n; j++)
+    c += b->a[j];
+  return d;
+}

gcc/tree-parloops.c

@@ -201,7 +201,7 @@ reduction_phi (htab_t reduction_list, gimple phi)
 {
   struct reduction_info tmpred, *red;
 
-  if (htab_elements (reduction_list) == 0)
+  if (htab_elements (reduction_list) == 0 || phi == NULL)
     return NULL;
 
   tmpred.reduc_phi = phi;