[arm] Fix iwmmxt load/store offset

[Paul Brook]

Patch below fixes iwmmxt constant indexed load/store offsets (+-256 words, not 
bytes).

Tested with cross to arm-none-elf.
Ok?

Paul

2004-04-26  Paul Brook  <paul@codesourcery.com>

	* config/arm/arm.c (arm_legitimate_index_p): Correct iwmmxt offsets.

Index: arm.c
===================================================================
RCS file: /var/cvsroot/gcc-cvs/gcc/gcc/config/arm/arm.c,v
retrieving revision 1.350
diff -u -p -r1.350 arm.c
--- a/arm.c	26 Apr 2004 10:32:53 -0000	1.350
+++ b/arm.c	26 Apr 2004 13:26:24 -0000
@@ -3104,8 +3104,9 @@ arm_legitimate_index_p (enum machine_mod
 
   if (TARGET_REALLY_IWMMXT && VALID_IWMMXT_REG_MODE (mode))
     return (code == CONST_INT
-	    && INTVAL (index) < 256
-	    && INTVAL (index) > -256);
+	    && INTVAL (index) < 1024
+	    && INTVAL (index) > -1024
+	    && (INTVAL (index) & 3) == 0);
 
   if (GET_MODE_SIZE (mode) <= 4
       && ! (arm_arch4