Fix 61441 [ 1/5] Add REAL_VALUE_ISSIGNALING_NAN

[Saraswati, Sujoy (OSTL)]

Hi,
  This series of patches fixes PR61441.  The fix is broken into 5 patches. 

  The first one adds REAL_VALUE_ISSIGNALING_NAN. 

  2015-11-26  Sujoy Saraswati <sujoy.sarasw...@hpe.com>

       PR tree-optimization/61441
       * real.c (real_issignaling_nan): New.
       * real.h (real_issignaling_nan, REAL_VALUE_ISSIGNALING_NAN): New.

Index: gcc/real.c
===================================================================
--- gcc/real.c  (revision 230851)
+++ gcc/real.c  (working copy)
@@ -1195,6 +1195,13 @@ real_isnan (const REAL_VALUE_TYPE *r)
   return (r->cl == rvc_nan);
 }

+/* Determine whether a floating-point value X is a signalling NaN.  */
+bool
+real_issignaling_nan (const REAL_VALUE_TYPE *r)
+{
+  return real_isnan (r) && r->signalling;
+}
+
 /* Determine whether a floating-point value X is finite.  */

 bool
Index: gcc/real.h
===================================================================
--- gcc/real.h  (revision 230851)
+++ gcc/real.h  (working copy)
@@ -262,6 +262,9 @@ extern bool real_isinf (const REAL_VALUE_TYPE *);
 /* Determine whether a floating-point value X is a NaN.  */
 extern bool real_isnan (const REAL_VALUE_TYPE *);

+/* Determine whether a floating-point value X is a signalling NaN.  */
+extern bool real_issignaling_nan (const REAL_VALUE_TYPE *);
+
 /* Determine whether a floating-point value X is finite.  */
 extern bool real_isfinite (const REAL_VALUE_TYPE *);

@@ -357,6 +360,9 @@ extern const struct real_format arm_half_format;
 /* Determine whether a floating-point value X is a NaN.  */
 #define REAL_VALUE_ISNAN(x)            real_isnan (&(x))

+/* Determine whether a floating-point value X is a signalling NaN.  */
+#define REAL_VALUE_ISSIGNALING_NAN(x)  real_issignaling_nan (&(x))
+
 /* Determine whether a floating-point value X is negative.  */
 #define REAL_VALUE_NEGATIVE(x)         real_isneg (&(x))