re PR tree-optimization/71408 (wrong code at -Os and above on x86_64-linux-gnu)

gcc/ChangeLog:

2016-06-07  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/71408
	* tree-ssa-reassoc.c (zero_one_operation): Fix NEGATE_EXPR operand for
	propagate_op_to_single_use.


gcc/testsuite/ChangeLog:

2016-06-07  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/71408
	* gcc.dg/tree-ssa/pr71408.c: New test.

From-SVN: r237158

gcc/ChangeLog

 2016-06-07  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
+	PR middle-end/71408
+	* tree-ssa-reassoc.c (zero_one_operation): Fix NEGATE_EXPR operand for
+	propagate_op_to_single_use.
+
+2016-06-07  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
 	PR middle-end/71281
 	* tree-ssa-reassoc.c (reassociate_bb): Set uid for negate stmt.
 

gcc/testsuite/ChangeLog

 2016-06-07  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
+	PR middle-end/71408
+	* gcc.dg/tree-ssa/pr71408.c: New test.
+
+2016-06-07  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
 	PR middle-end/71281
 	* g++.dg/torture/pr71281.C: New test.
 

gcc/testsuite/gcc.dg/tree-ssa/pr71408.c

+/* PR middle-end/71408 */
+/* { dg-do run } */
+/* { dg-options "-Os" } */
+unsigned a, b;
+
+struct S0
+{
+  int f1:18;
+  unsigned f3:4;
+};
+
+void fn1 ()
+{
+  struct S0 c = { 7, 0 };
+  if (c.f1)
+    c.f3 = 3;
+  a = -~c.f3;
+  c.f3 = ~(c.f1 && c.f1);
+  c.f1 = c.f3 * (c.f1 - (c.f1 - a % c.f1)) + ~c.f3 * -a;
+  b = ~(c.f1 & a);
+  if (b >= 4294967295)
+    __builtin_abort ();
+}
+
+int
+main ()
+{
+  fn1 ();
+  return 0;
+}

gcc/tree-ssa-reassoc.c

@@ -1203,7 +1203,8 @@ zero_one_operation (tree *def, enum tree_code opcode, tree op)
 	    {
 	      if (gimple_assign_rhs1 (stmt) == op)
 		{
-		  propagate_op_to_single_use (op, stmt, def);
+		  tree cst = build_minus_one_cst (TREE_TYPE (op));
+		  propagate_op_to_single_use (cst, stmt, def);
 		  return;
 		}
 	      else if (integer_minus_onep (op)
@@ -1251,7 +1252,8 @@ zero_one_operation (tree *def, enum tree_code opcode, tree op)
 	    {
 	      if (gimple_assign_rhs1 (stmt2) == op)
 		{
-		  propagate_op_to_single_use (op, stmt2, def);
+		  tree cst = build_minus_one_cst (TREE_TYPE (op));
+		  propagate_op_to_single_use (cst, stmt2, def);
 		  return;
 		}
 	      else if (integer_minus_onep (op)