regmove.c (regmove_optimize): Use reg_mentioned_p instead of reg_overlap_mentioned_p for DST.

2007-03-21  Seongbae Park <seongbae.park@gmail.com>

	* regmove.c (regmove_optimize): Use reg_mentioned_p
	instead of reg_overlap_mentioned_p for DST.

From-SVN: r123124

gcc/ChangeLog

+2007-03-21  Seongbae Park <seongbae.park@gmail.com>
+
+	* regmove.c (regmove_optimize): Use reg_mentioned_p
+	instead of reg_overlap_mentioned_p for DST.
+
 2007-03-21  Mike Stump  <mrs@apple.com>
 
 	* c.opt: Fixup for Objective-C/C++.

gcc/regmove.c

@@ -1429,8 +1429,13 @@ regmove_optimize (rtx f, int nregs)
 		      break;
 		    }
 
+		  /* We can't make this change if SRC is read or
+		     partially written in P, since we are going to
+		     eliminate SRC. We can't make this change 
+		     if DST is mentioned at all in P,
+		     since we are going to change its value.  */
 		  if (reg_overlap_mentioned_p (src, PATTERN (p))
-		      || reg_overlap_mentioned_p (dst, PATTERN (p)))
+		      || reg_mentioned_p (dst, PATTERN (p)))
 		    break;
 
 		  /* If we have passed a call instruction, and the