re PR tree-optimization/63738 (ssa corruption when compiled with -O3)

2014-11-26  Richard Biener  <rguenther@suse.de>

	PR middle-end/63738
	* tree-data-ref.c (split_constant_offset_1): Do not follow
	SSA edges for SSA names with SSA_NAME_OCCURS_IN_ABNORMAL_PHI.

	* gcc.dg/torture/pr63738.c: New testcase.

From-SVN: r218088

gcc/ChangeLog

 2014-11-26  Richard Biener  <rguenther@suse.de>
 
+	PR middle-end/63738
+	* tree-data-ref.c (split_constant_offset_1): Do not follow
+	SSA edges for SSA names with SSA_NAME_OCCURS_IN_ABNORMAL_PHI.
+
+2014-11-26  Richard Biener  <rguenther@suse.de>
+
 	* fold-const.h (const_unop): Declare.
 	(const_binop): Likewise.
 	* fold-const.c (const_binop): Export overload that expects

gcc/testsuite/ChangeLog

+2014-11-26  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/63738
+	* gcc.dg/torture/pr63738.c: New testcase.
+
 2014-11-26  Ilya Enkovich  <ilya.enkovich@intel.com>
 
 	PR bootstrap/63995

gcc/testsuite/gcc.dg/torture/pr63738.c

+/*  { dg-do compile } */
+
+#include <setjmp.h>
+
+struct longjmp_buffer {
+  jmp_buf buf;
+};
+
+void plouf();
+
+extern long interprete()
+{
+  long * sp;
+  int i;
+  long *args;
+  int n;
+
+  struct longjmp_buffer raise_buf;
+  _setjmp (raise_buf.buf);
+
+  plouf();
+  sp -= 4;
+  for (i = 0; i < n; i++)
+    args[i] = sp[10-i];
+  plouf();
+  return 0;
+}

gcc/tree-data-ref.c

@@ -674,6 +674,9 @@ split_constant_offset_1 (tree type, tree op0, enum tree_code code, tree op1,
 
     case SSA_NAME:
       {
+	if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op0))
+	  return false;
+
 	gimple def_stmt = SSA_NAME_DEF_STMT (op0);
 	enum tree_code subcode;