gcse.c (try_replace_reg): Disallow REG_EQUAL notes for STRICT_LOW_PART SETs.

2005-09-06  Andreas Krebbel  <krebbel1@de.ibm.com>

	* gcse.c (try_replace_reg): Disallow REG_EQUAL notes for
	STRICT_LOW_PART SETs.

From-SVN: r103934

gcc/ChangeLog

+2005-09-06  Andreas Krebbel  <krebbel1@de.ibm.com>
+
+	* gcse.c (try_replace_reg): Disallow REG_EQUAL notes for 
+	STRICT_LOW_PART SETs.
+
 2005-09-06  Alan Modra  <amodra@bigpond.net.au>
 
 	PR middle-end/21460

gcc/gcse.c

@@ -2677,7 +2677,8 @@ try_replace_reg (rtx from, rtx to, rtx insn)
 	 have a note, and have no special SET, add a REG_EQUAL note to not
 	 lose information.  */
       if (!success && note == 0 && set != 0
-	  && GET_CODE (SET_DEST (set)) != ZERO_EXTRACT)
+	  && GET_CODE (SET_DEST (set)) != ZERO_EXTRACT
+	  && GET_CODE (SET_DEST (set)) != STRICT_LOW_PART)
 	note = set_unique_reg_note (insn, REG_EQUAL, copy_rtx (src));
     }