re PR tree-optimization/69801 (gcc ICE on valid code on x86_64-linux-gnu in "operand_equal_p")

2016-02-16  Richard Biener  <rguenther@suse.de>

	PR middle-end/69801
	* fold-const.c (operand_equal_p): For COND_EXPR zero operand
	mask OEP_ADDRESS_OF.

	* gcc.dg/pr69801.c: New testcase.

From-SVN: r233444

gcc/ChangeLog

+2016-02-16  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/69801
+	* fold-const.c (operand_equal_p): For COND_EXPR zero operand
+	mask OEP_ADDRESS_OF.
+
 2016-02-16  Alan Modra  <amodra@gmail.com>
 
 	PR target/68973

gcc/fold-const.c

@@ -3118,6 +3118,11 @@ operand_equal_p (const_tree arg0, const_tree arg1, unsigned int flags)
 				      TREE_OPERAND (arg1, 0), flags));
 
 	case COND_EXPR:
+	  if (! OP_SAME (1) || ! OP_SAME (2))
+	    return 0;
+	  flags &= ~OEP_ADDRESS_OF;
+	  return OP_SAME (0);
+
 	case VEC_COND_EXPR:
 	case DOT_PROD_EXPR:
 	  return OP_SAME (0) && OP_SAME (1) && OP_SAME (2);

gcc/testsuite/ChangeLog

+2016-02-16  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/69801
+	* gcc.dg/pr69801.c: New testcase.
+
 2016-02-15  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/69651

gcc/testsuite/gcc.dg/pr69801.c

+/* { dg-do compile } */
+
+struct {
+    char c[1];
+} b, c;
+int d, e;
+void fn1() { e ? (d ? b : c).c : (d ? b : c).c; }