m32r.c (m32r_expand_block_move): Return 0 if nothing was done.

* config/m32r/m32r.c (m32r_expand_block_move):  Return 0 if nothing was done.
* config/m32r/m32r.md (movmemsi):  If m32r_expand_block_move did nothing then FAIL.
* config/m32r/m32r/m32r-protos.h  (m32r_expand_block_move): Update prototype.

From-SVN: r100095

gcc/ChangeLog

+2005-05-24  Kazuhiro Inaoka <inaoka.kazuhiro@renesas.com>
+
+	* config/m32r/m32r.c (m32r_expand_block_move):  Return 0 if
+	nothing was done.
+	* config/m32r/m32r.md (movmemsi):  If m32r_expand_block_move did
+	nothing then FAIL.
+	* config/m32r/m32r/m32r-protos.h  (m32r_expand_block_move): Update
+	prototype.
+
 2005-05-23  Jeff Law  <law@redhat.com>
 
 	* tree-ssa-dom.c (cprop_into_stmt): Do not call

gcc/config/m32r/m32r-protos.h

@@ -47,7 +47,7 @@ extern void   m32r_initialize_trampoline (rtx, rtx, rtx);
 extern int    zero_and_one (rtx, rtx);
 extern char * emit_cond_move (rtx *, rtx);
 extern void   m32r_output_block_move (rtx, rtx *);
-extern void   m32r_expand_block_move (rtx *);
+extern int    m32r_expand_block_move (rtx *);
 extern void   m32r_print_operand (FILE *, rtx, int);
 extern void   m32r_print_operand_address (FILE *, rtx);
 extern int    m32r_not_same_reg (rtx, rtx);

gcc/config/m32r/m32r.c

@@ -2201,9 +2201,11 @@ block_move_call (rtx dest_reg, rtx src_reg, rtx bytes_rtx)
    operands[0] is the pointer to the destination.
    operands[1] is the pointer to the source.
    operands[2] is the number of bytes to move.
-   operands[3] is the alignment.  */
+   operands[3] is the alignment.
 
-void
+   Returns 1 upon success, 0 otherwise.  */
+
+int
 m32r_expand_block_move (rtx operands[])
 {
   rtx           orig_dst  = operands[0];
@@ -2218,7 +2220,7 @@ m32r_expand_block_move (rtx operands[])
   rtx           dst_reg;
 
   if (constp && bytes <= 0)
-    return;
+    return 1;
 
   /* Move the address into scratch registers.  */
   dst_reg = copy_addr_to_reg (XEXP (orig_dst, 0));
@@ -2233,7 +2235,7 @@ m32r_expand_block_move (rtx operands[])
   if (optimize_size || ! constp || align != UNITS_PER_WORD)
     {
       block_move_call (dst_reg, src_reg, bytes_rtx);
-      return;
+      return 0;
     }
 
   leftover = bytes % MAX_MOVE_BYTES;
@@ -2290,6 +2292,7 @@ m32r_expand_block_move (rtx operands[])
     emit_insn (gen_movmemsi_internal (dst_reg, src_reg, GEN_INT (leftover),
 				      gen_reg_rtx (SImode),
 				      gen_reg_rtx (SImode)));
+  return 1;
 }
 
 

gcc/config/m32r/m32r.md

@@ -2542,10 +2542,12 @@
   ""
   "
 {
-  if (operands[0])		/* avoid unused code messages */
+  if (operands[0])		/* Avoid unused code messages.  */
     {
-      m32r_expand_block_move (operands);
-      DONE;
+     if (m32r_expand_block_move (operands))
+       DONE;
+     else
+       FAIL;
     }
 }")