re PR target/10730 ([arm] -O2 generates invalid asm)

2003-05-15  Philip Blundell  <philb@gnu.org>

	PR target/10730
	* config/arm/arm.c (adjacent_mem_locations): Reject offsets
	involving invalid constants.

From-SVN: r66838

gcc/ChangeLog

+2003-05-15  Philip Blundell  <philb@gnu.org>
+
+	PR target/10730
+	* config/arm/arm.c (adjacent_mem_locations): Reject offsets
+	involving invalid constants.
+
 2003-05-15  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
 	* pa.c (hppa_expand_prologue): Remove blockage.

gcc/config/arm/arm.c

@@ -4571,6 +4571,12 @@ adjacent_mem_locations (a, b)
       else
 	reg1 = REGNO (XEXP (b, 0));
 
+      /* Don't accept any offset that will require multiple instructions to handle,
+	 since this would cause the arith_adjacentmem pattern to output an overlong
+	 sequence.  */
+      if (!const_ok_for_op (PLUS, val0) || !const_ok_for_op (PLUS, val1))
+	return 0;
+      
       return (reg0 == reg1) && ((val1 - val0) == 4 || (val0 - val1) == 4);
     }
   return 0;