re PR target/58139 (PowerPC volatile VSX register live across call)

	PR target/58139
	* reginfo.c (choose_hard_reg_mode): Scan through all mode classes
	looking for widest mode.

From-SVN: r202286

gcc/ChangeLog

+2013-09-05  Peter Bergner  <bergner@vnet.ibm.com>
+
+	PR target/58139
+	* reginfo.c (choose_hard_reg_mode): Scan through all mode classes
+	looking for widest mode.
+
 2013-09-05  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* config.gcc (*-*-vxworks*): Do not override an existing extra_objs.

gcc/reginfo.c

@@ -620,40 +620,35 @@ choose_hard_reg_mode (unsigned int regno ATTRIBUTE_UNUSED,
        mode = GET_MODE_WIDER_MODE (mode))
     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
 	&& HARD_REGNO_MODE_OK (regno, mode)
-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
       found_mode = mode;
 
-  if (found_mode != VOIDmode)
-    return found_mode;
-
   for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
        mode != VOIDmode;
        mode = GET_MODE_WIDER_MODE (mode))
     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
 	&& HARD_REGNO_MODE_OK (regno, mode)
-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
       found_mode = mode;
 
-  if (found_mode != VOIDmode)
-    return found_mode;
-
   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
        mode != VOIDmode;
        mode = GET_MODE_WIDER_MODE (mode))
     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
 	&& HARD_REGNO_MODE_OK (regno, mode)
-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
       found_mode = mode;
 
-  if (found_mode != VOIDmode)
-    return found_mode;
-
   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
        mode != VOIDmode;
        mode = GET_MODE_WIDER_MODE (mode))
     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
 	&& HARD_REGNO_MODE_OK (regno, mode)
-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
       found_mode = mode;
 
   if (found_mode != VOIDmode)