File gcc48-ibm-power8-bnc871635.diff of Package gcc48.2996

2013-12-03  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

	* config/rs6000/ibm-ldouble.c (__gcc_qadd): Fix add
	of normal number and qNaN to not raise an inexact exception.

	* gcc.target/powerpc/pr57363.c: New test.

Index: libgcc/config/rs6000/ibm-ldouble.c
===================================================================
--- libgcc/config/rs6000/ibm-ldouble.c	(revision 205644)
+++ libgcc/config/rs6000/ibm-ldouble.c	(revision 205645)
@@ -104,6 +104,8 @@ __gcc_qadd (double a, double aa, double
 
   if (nonfinite (z))
     {
+      if (fabs (z) != inf())
+	return z;
       z = cc + aa + c + a;
       if (nonfinite (z))
 	return z;
Index: gcc/testsuite/gcc.target/powerpc/pr57363.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/pr57363.c	(revision 0)
+++ gcc/testsuite/gcc.target/powerpc/pr57363.c	(revision 205645)
@@ -0,0 +1,19 @@
+/* { dg-do run { target { powerpc*-*-linux* } } } */
+/* { dg-options "-mlong-double-128" } */
+
+/* Check if adding a qNAN and a normal long double does not generate a
+   inexact exception.  */
+
+#define _GNU_SOURCE
+#include <fenv.h>
+
+int main(void)
+{
+  double x = __builtin_nan ("");
+  long double y = 1.1L;
+
+  feenableexcept (FE_INEXACT);
+  feclearexcept (FE_ALL_EXCEPT);
+  x = x + y;
+  return fetestexcept(FE_INEXACT);
+}