tree-ssa-sccvn.c (vn_nary_op_compute_hash): Also canonicalize comparison operand…

tree-ssa-sccvn.c (vn_nary_op_compute_hash): Also canonicalize comparison operand order and commutative ternary op operand order.

2015-08-12  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.c (vn_nary_op_compute_hash): Also canonicalize
	comparison operand order and commutative ternary op operand order.
	(sccvn_dom_walker::cond_stack): New state to track temporary
	expressions.
	(sccvn_dom_walker::after_dom_children): Remove tempoary expressions
	no longer valid.
	(sccvn_dom_walker::record_cond): Add a single temporary conditional
	expression.
	(sccvn_dom_walker::record_conds): Add a temporary conditional
	expressions and all related expressions also true/false.
	(sccvn_dom_walker::before_dom_children): Record temporary
	expressions based on the controlling condition of a single
	predecessor.  When trying to simplify a conditional statement
	lookup expressions we might have inserted earlier.

	* testsuite/gcc.dg/tree-ssa/ssa-fre-47.c: New testcase.
	* testsuite/gcc.dg/tree-ssa/ssa-fre-48.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/ssa-fre-49.c: Likewise.
	* testsuite/g++.dg/tree-ssa/pr61034.C: Adjust.
	* testsuite/gcc.dg/fold-compare-2.c: Likewise.
	* testsuite/gcc.dg/pr50763.c: Likewise.
	* testsuite/gcc.dg/predict-3.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/20030709-2.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/pr19831-3.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/pr20657.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/pr21001.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/pr37508.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp04.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp07.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp09.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp16.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp20.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp25.c: Likewise.
	* testsuite/gcc.dg/tree-ssa/vrp87.c: Likewise.

From-SVN: r226852

gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-47.c

+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-fre1" } */
+
+int foo (int i)
+{
+  if (i)
+    {
+      if (i)
+	return 0;
+      else
+	return 1;
+    }
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "return 0;" "fre1" } } */

gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-48.c

+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-fre1-details" } */
+
+int foo (int i)
+{
+  if (i)
+    {
+      if (i)
+	return 1;
+      else
+	return 0;
+    }
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "Removing unexecutable edge" "fre1" } } */

gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-49.c

+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-fre1" } */
+
+int foo (int i, int j)
+{
+  if (i < j)
+    {
+      if (i <= j)
+	return j > i;
+      else
+	return 0;
+    }
+  return 1;
+}
+
+/* { dg-final { scan-tree-dump "return 1;" "fre1" } }  */