tree-ssa-reassoc.c (attempt_builtin_copysign): Call gimple_call_builtin instead of is_gimple_call.

	* tree-ssa-reassoc.c (attempt_builtin_copysign): Call
	gimple_call_builtin instead of is_gimple_call.

	* gcc.dg/tree-ssa/reassoc-42.c: New test.

From-SVN: r228843

gcc/ChangeLog

+2015-10-15  Marek Polacek  <polacek@redhat.com>
+
+	* tree-ssa-reassoc.c (attempt_builtin_copysign): Call
+	gimple_call_builtin instead of is_gimple_call.
+
 2015-10-15  Richard Biener  <rguenther@suse.de>
 
 	* tree-vect-stmts.c (vect_init_vector): Remove unused vars.

gcc/testsuite/ChangeLog

 2015-10-15  Marek Polacek  <polacek@redhat.com>
 
+	* gcc.dg/tree-ssa/reassoc-42.c: New test.
+
+2015-10-15  Marek Polacek  <polacek@redhat.com>
+
 	PR tree-optimization/67953
 	* gcc.dg/fold-minus-6.c (fn4): Change the type of A to
 	unsigned.

gcc/testsuite/gcc.dg/tree-ssa/reassoc-42.c

+/* { dg-do compile } */
+/* { dg-options "-Ofast" } */
+
+double
+foo (double f(void))
+{
+  return 2. * f ();
+}

gcc/tree-ssa-reassoc.c

@@ -4643,7 +4643,7 @@ attempt_builtin_copysign (vec<operand_entry *> *ops)
 	  && has_single_use (oe->op))
 	{
 	  gimple *def_stmt = SSA_NAME_DEF_STMT (oe->op);
-	  if (is_gimple_call (def_stmt))
+	  if (gimple_call_builtin_p (def_stmt, BUILT_IN_NORMAL))
 	    {
 	      tree fndecl = gimple_call_fndecl (def_stmt);
 	      tree arg0, arg1;