arm.c (arm_legitimize_reload_address): For NEON quad-word modes, reduce to 9-bit…

arm.c (arm_legitimize_reload_address): For NEON quad-word modes, reduce to 9-bit index range when above 1016 limit.

2011-04-20  Chung-Lin Tang  <cltang@codesourcery.com>

	* config/arm/arm.c (arm_legitimize_reload_address): For NEON
	quad-word modes, reduce to 9-bit index range when above 1016
	limit.

From-SVN: r172779

gcc/ChangeLog

+2011-04-20  Chung-Lin Tang  <cltang@codesourcery.com>
+
+	* config/arm/arm.c (arm_legitimize_reload_address): For NEON
+	quad-word modes, reduce to 9-bit index range when above 1016
+	limit.
+
 2011-04-20  Andrew Stubbs  <ams@codesourcery.com>
 
 	* config/arm/arm.c (arm_gen_constant): Move movw support ....

gcc/config/arm/arm.c

@@ -6330,7 +6330,15 @@ arm_legitimize_reload_address (rtx *p,
        : 0)
 
       if (coproc_p)
-	low = SIGN_MAG_LOW_ADDR_BITS (val, 10);
+	{
+	  low = SIGN_MAG_LOW_ADDR_BITS (val, 10);
+
+	  /* NEON quad-word load/stores are made of two double-word accesses,
+	     so the valid index range is reduced by 8. Treat as 9-bit range if
+	     we go over it.  */
+	  if (TARGET_NEON && VALID_NEON_QREG_MODE (mode) && low >= 1016)
+	    low = SIGN_MAG_LOW_ADDR_BITS (val, 9);
+	}
       else if (GET_MODE_SIZE (mode) == 8)
 	{
 	  if (TARGET_LDRD)