re PR debug/47780 (-fcompare-debug failure with -O -fgcse -fgcse-las -fstack-protector-all)

	PR debug/47780
	* cfgexpand.c (expand_debug_expr) <case SSA_NAME>: Call copy_rtx to
	avoid invalid rtx sharing.

	* gcc.target/i386/pr47780.c: New test.

From-SVN: r170270

gcc/ChangeLog

+2011-02-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/47780
+	* cfgexpand.c (expand_debug_expr) <case SSA_NAME>: Call copy_rtx to
+	avoid invalid rtx sharing.
+
 2011-02-18  Gerald Pfeifer  <gerald@pfeifer.com>
 
 	* doc/cpp.texi (Obsolete Features): Add background on the

gcc/cfgexpand.c

@@ -3104,7 +3104,7 @@ expand_debug_expr (tree exp)
 
 	    gcc_assert (part >= 0 && (unsigned)part < SA.map->num_partitions);
 
-	    op0 = SA.partition_to_pseudo[part];
+	    op0 = copy_rtx (SA.partition_to_pseudo[part]);
 	  }
 	goto adjust_mode;
       }

gcc/testsuite/ChangeLog

+2011-02-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/47780
+	* gcc.target/i386/pr47780.c: New test.
+
 2011-02-18  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/47767

gcc/testsuite/gcc.target/i386/pr47780.c

+/* PR debug/47780 */
+/* { dg-do compile } */
+/* { dg-options "-O -fgcse -fgcse-las -fstack-protector-all -fno-tree-ccp -fno-tree-dominator-opts -fcompare-debug -Wno-psabi" } */
+
+typedef int V2SF __attribute__ ((vector_size (128)));
+
+V2SF
+foo (int x, V2SF a)
+{
+  V2SF b = a + (V2SF) {};
+  while (x--)
+    a += b;
+  return a;
+}