spu.h (CANNOT_CHANGE_MODE_CLASS): Allow (multi)word-sized SUBREG of multi-word hard register.

	* config/spu/spu.h (CANNOT_CHANGE_MODE_CLASS): Allow (multi)word-sized
	SUBREG of multi-word hard register.
	* config/spu/spu.c (valid_subreg): Likewise.
	(adjust_operand): Handle SUBREGs of multi-word hard registers.

From-SVN: r138711

gcc/ChangeLog

+2008-08-05  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	* config/spu/spu.h (CANNOT_CHANGE_MODE_CLASS): Allow (multi)word-sized
+	SUBREG of multi-word hard register.
+	* config/spu/spu.c (valid_subreg): Likewise.
+	(adjust_operand): Handle SUBREGs of multi-word hard registers.
+
 2008-08-04  Richard Guenther  <rguenther@suse.de>
 
 	* tree-ssa-loop-ivopts.c (add_iv_value_candidates): Also add

gcc/config/spu/spu.c

@@ -419,7 +419,8 @@ valid_subreg (rtx op)
   enum machine_mode im = GET_MODE (SUBREG_REG (op));
   return om != VOIDmode && im != VOIDmode
     && (GET_MODE_SIZE (im) == GET_MODE_SIZE (om)
-	|| (GET_MODE_SIZE (im) <= 4 && GET_MODE_SIZE (om) <= 4));
+	|| (GET_MODE_SIZE (im) <= 4 && GET_MODE_SIZE (om) <= 4)
+	|| (GET_MODE_SIZE (im) >= 16 && GET_MODE_SIZE (om) >= 16));
 }
 
 /* When insv and ext[sz]v ar passed a TI SUBREG, we want to strip it off
@@ -429,8 +430,10 @@ adjust_operand (rtx op, HOST_WIDE_INT * start)
 {
   enum machine_mode mode;
   int op_size;
-  /* Strip any SUBREG */
-  if (GET_CODE (op) == SUBREG)
+  /* Strip any paradoxical SUBREG.  */
+  if (GET_CODE (op) == SUBREG
+      && (GET_MODE_BITSIZE (GET_MODE (op))
+	  > GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (op)))))
     {
       if (start)
 	*start -=

gcc/config/spu/spu.h

@@ -263,6 +263,7 @@ enum reg_class {
    only true for SPU. */
 #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
         ((GET_MODE_SIZE (FROM) > 4 || GET_MODE_SIZE (TO) > 4) \
+	 && (GET_MODE_SIZE (FROM) < 16 || GET_MODE_SIZE (TO) < 16) \
 	 && GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO))
 
 #define REGISTER_TARGET_PRAGMAS() do {					\