emit-rtl.c (set_mem_size): New function.

	* emit-rtl.c (set_mem_size): New function.
	* expr.h (set_mem_size): Declare.
	* config/rs6000/rs6000.c (expand_block_move_mem): Exterminate.
	(expand_block_move): Instead, use adjust_address and
	replace_equiv_address to generate proper aliasing info.
	Move common code out of conditionals.  Localize vars.

From-SVN: r57047

gcc/ChangeLog

+2002-09-12  Alan Modra  <amodra@bigpond.net.au>
+
+	* emit-rtl.c (set_mem_size): New function.
+	* expr.h (set_mem_size): Declare.
+	* config/rs6000/rs6000.c (expand_block_move_mem): Exterminate.
+	(expand_block_move): Instead, use adjust_address and
+	replace_equiv_address to generate proper aliasing info.
+	Move common code out of conditionals.  Localize vars.
+
 2002-09-09  Eric Botcazou  ebotcazou@libertysurf.fr
   
 	* optabs.c (expand_binop): Minor cleanup.

gcc/emit-rtl.c

@@ -1968,6 +1968,17 @@ set_mem_offset (mem, offset)
 				   offset, MEM_SIZE (mem), MEM_ALIGN (mem),
 				   GET_MODE (mem));
 }
+
+/* Set the size of MEM to SIZE.  */
+
+void
+set_mem_size (mem, size)
+     rtx mem, size;
+{
+  MEM_ATTRS (mem) = get_mem_attrs (MEM_ALIAS_SET (mem), MEM_EXPR (mem),
+				   MEM_OFFSET (mem), size, MEM_ALIGN (mem),
+				   GET_MODE (mem));
+}
 
 /* Return a memory reference like MEMREF, but with its mode changed to MODE
    and its address changed to ADDR.  (VOIDmode means don't change the mode.

gcc/expr.h

@@ -616,6 +616,9 @@ extern void set_mem_expr PARAMS ((rtx, tree));
 /* Set the offset for MEM to OFFSET.  */
 extern void set_mem_offset PARAMS ((rtx, rtx));
 
+/* Set the size for MEM to SIZE.  */
+extern void set_mem_size PARAMS ((rtx, rtx));
+
 /* Return a memory reference like MEMREF, but with its mode changed
    to MODE and its address changed to ADDR.
    (VOIDmode means don't change the mode.