rs6000.c (rs6000_preferred_reload_class): Disallow reload of PLUS rtx's outside…

rs6000.c (rs6000_preferred_reload_class): Disallow reload of PLUS rtx's outside of GENERAL_REGS or BASE_REGS...

2014-03-03  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_preferred_reload_class): Disallow
	reload of PLUS rtx's outside of GENERAL_REGS or BASE_REGS; relax
	constraint on constants to permit them being loaded into
	GENERAL_REGS or BASE_REGS.

From-SVN: r208287

gcc/ChangeLog

+2014-03-03  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	* config/rs6000/rs6000.c (rs6000_preferred_reload_class): Disallow
+	reload of PLUS rtx's outside of GENERAL_REGS or BASE_REGS; relax
+	constraint on constants to permit them being loaded into
+	GENERAL_REGS or BASE_REGS.
+
 2014-03-03  Nick Clifton  <nickc@redhat.com>
 
 	* config/rl78/rl78-real.md (cbranchsi4_real_signed): Add

gcc/config/rs6000/rs6000.c

@@ -16751,8 +16751,14 @@ rs6000_preferred_reload_class (rtx x, enum reg_class rclass)
       && easy_vector_constant (x, mode))
     return ALTIVEC_REGS;
 
-  if (CONSTANT_P (x) && reg_classes_intersect_p (rclass, FLOAT_REGS))
-    return NO_REGS;
+  if ((CONSTANT_P (x) || GET_CODE (x) == PLUS))
+    {
+      if (reg_class_subset_p (GENERAL_REGS, rclass))
+	return GENERAL_REGS;
+      if (reg_class_subset_p (BASE_REGS, rclass))
+	return BASE_REGS;
+      return NO_REGS;
+    }
 
   if (GET_MODE_CLASS (mode) == MODE_INT && rclass == NON_SPECIAL_REGS)
     return GENERAL_REGS;