s390.c (s390_option_override): Make -mhard-dfp the default if possible and not specified otherwise.

2012-02-21  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* config/s390/s390.c (s390_option_override): Make -mhard-dfp the
	default if possible and not specified otherwise.

From-SVN: r184439

gcc/ChangeLog

+2012-02-21  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	* config/s390/s390.c (s390_option_override): Make -mhard-dfp the
+	default if possible and not specified otherwise.
+
 2012-02-21  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/52314

gcc/config/s390/s390.c

@@ -1540,6 +1540,11 @@ s390_option_override (void)
   if (TARGET_64BIT && !TARGET_ZARCH)
     error ("64-bit ABI not supported in ESA/390 mode");
 
+  /* Use hardware DFP if available and not explicitly disabled by
+     user. E.g. with -m31 -march=z10 -mzarch   */
+  if (!(target_flags_explicit & MASK_HARD_DFP) && TARGET_DFP)
+    target_flags |= MASK_HARD_DFP;
+
   if (TARGET_HARD_DFP && !TARGET_DFP)
     {
       if (target_flags_explicit & MASK_HARD_DFP)