PATCH [4/n]: Prepare x32: Permute the conversion and addition if one operand is a constant

PATCH [4/n]: Prepare x32: Permute the conversion and addition if one operand is a constant

[H.J. Lu]

Hi,

convert_memory_address_addr_space has a special PLUS/MULT case for
POINTERS_EXTEND_UNSIGNED < 0.  It turns out that it is also needed
for all Pmode != ptr_mode cases.  OK for trunk?

Thanks.


H.J.
---
2011-06-11  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/47727
	* explow.c (convert_memory_address_addr_space): Permute the
	conversion and addition if one operand is a constant.

diff --git a/gcc/explow.c b/gcc/explow.c
index 7387dad..b343bf8 100644
--- a/gcc/explow.c
+++ b/gcc/explow.c
@@ -383,18 +383,13 @@ convert_memory_address_addr_space (enum machine_mode to_mode ATTRIBUTE_UNUSED,
 
     case PLUS:
     case MULT:
-      /* For addition we can safely permute the conversion and addition
-	 operation if one operand is a constant and converting the constant
-	 does not change it or if one operand is a constant and we are
-	 using a ptr_extend instruction  (POINTERS_EXTEND_UNSIGNED < 0).
-	 We can always safely permute them if we are making the address
-	 narrower.  */
+      /* For addition we safely permute the conversion and addition
+	 operation if one operand is a constant since we can't generate
+	 new instructions.  We can always safely permute them if we are
+	 making the address narrower.  */
       if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode)
 	  || (GET_CODE (x) == PLUS
-	      && CONST_INT_P (XEXP (x, 1))
-	      && (XEXP (x, 1) == convert_memory_address_addr_space
-				   (to_mode, XEXP (x, 1), as)
-                 || POINTERS_EXTEND_UNSIGNED < 0)))
+	      && CONST_INT_P (XEXP (x, 1))))
 	return gen_rtx_fmt_ee (GET_CODE (x), to_mode,
 			       convert_memory_address_addr_space
 				 (to_mode, XEXP (x, 0), as),