This series of patches are for fixing PR61441.

This series of patches are for fixing PR61441. This patch modifies code to use
REAL_VALUE_ISSIGNALING_NAN instead of REAL_VALUE_ISNAN to avoid the operatins
only for sNaN operands.

Bootstrapped & regression-tested on x86_64-linux-gnu.

gcc/
	* fold-const.c (const_binop): Use REAL_VALUE_ISSIGNALING_NAN instead
	of REAL_VALUE_ISNAN to avoid the operation for sNaN operands.
	* simplify-rtx.c (simplify_const_binary_operation): Same.

From-SVN: r231857

gcc/ChangeLog

+2015-12-20  Sujoy Saraswati  <sujoy.saraswati@hpe.com>
+
+	PR tree-optimization/61441
+	* fold-const.c (const_binop): Use REAL_VALUE_ISSIGNALING_NAN instead
+	of REAL_VALUE_ISNAN to avoid the operation for sNaN operands.
+	* simplify-rtx.c (simplify_const_binary_operation): Same.
+
 2015-12-19  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR middle-end/65337

gcc/fold-const.c

@@ -1150,9 +1150,10 @@ const_binop (enum tree_code code, tree arg1, tree arg2)
       mode = TYPE_MODE (type);
 
       /* Don't perform operation if we honor signaling NaNs and
-	 either operand is a NaN.  */
+	 either operand is a signaling NaN.  */
       if (HONOR_SNANS (mode)
-	  && (REAL_VALUE_ISNAN (d1) || REAL_VALUE_ISNAN (d2)))
+	  && (REAL_VALUE_ISSIGNALING_NAN (d1)
+	      || REAL_VALUE_ISSIGNALING_NAN (d2)))
 	return NULL_TREE;
 
       /* Don't perform operation if it would raise a division

gcc/simplify-rtx.c

@@ -3892,7 +3892,8 @@ simplify_const_binary_operation (enum rtx_code code, machine_mode mode,
 	  real_convert (&f1, mode, CONST_DOUBLE_REAL_VALUE (op1));
 
 	  if (HONOR_SNANS (mode)
-	      && (REAL_VALUE_ISNAN (f0) || REAL_VALUE_ISNAN (f1)))
+	      && (REAL_VALUE_ISSIGNALING_NAN (f0)
+	          || REAL_VALUE_ISSIGNALING_NAN (f1)))
 	    return 0;
 
 	  if (code == DIV