for  gcc/ChangeLog
from  Alexandre Oliva  <aoliva@redhat.com>

	PR debug/41276
	* cselib.c (cselib_expand_value_rtx_1): Don't return copy of
	invalid subreg.

Index: gcc/cselib.c
===================================================================
--- gcc/cselib.c.orig	2009-08-14 08:00:12.000000000 -0300
+++ gcc/cselib.c	2009-09-07 19:17:35.000000000 -0300
@@ -1165,12 +1165,12 @@ cselib_expand_value_rtx_1 (rtx orig, str
 	scopy = simplify_gen_subreg (GET_MODE (orig), subreg,
 				     GET_MODE (SUBREG_REG (orig)),
 				     SUBREG_BYTE (orig));
-	if (scopy == NULL
-	    || (GET_CODE (scopy) == SUBREG
-		&& !REG_P (SUBREG_REG (scopy))
-		&& !MEM_P (SUBREG_REG (scopy))
-		&& (REG_P (SUBREG_REG (orig))
-		    || MEM_P (SUBREG_REG (orig)))))
+	if ((scopy == NULL
+	     || (GET_CODE (scopy) == SUBREG
+		 && !REG_P (SUBREG_REG (scopy))
+		 && !MEM_P (SUBREG_REG (scopy))))
+	    && (REG_P (SUBREG_REG (orig))
+		|| MEM_P (SUBREG_REG (orig))))
 	  return shallow_copy_rtx (orig);
 	return scopy;
       }