cse.c (cse_insn): Correct usage of simplify_replace_rtx when updating the REG_EQUAL note on an...

	* cse.c (cse_insn): Correct usage of simplify_replace_rtx when
	updating the REG_EQUAL note on an insn's libcall_insn.

From-SVN: r80400

gcc/ChangeLog

 2004-04-04  Roger Sayle  <roger@eyesopen.com>
 
+	* cse.c (cse_insn): Correct usage of simplify_replace_rtx when
+	updating the REG_EQUAL note on an insn's libcall_insn.
+
+2004-04-04  Roger Sayle  <roger@eyesopen.com>
+
 	* df.h: Tidy up whitespace in the definitions of the DF_ flags.
 
 2004-04-03  Roger Sayle  <roger@eyesopen.com>

gcc/cse.c

@@ -5402,8 +5402,13 @@ cse_insn (rtx insn, rtx libcall_insn)
 		  && (GET_CODE (sets[i].orig_src) == REG
 		      || GET_CODE (sets[i].orig_src) == SUBREG
 		      || GET_CODE (sets[i].orig_src) == MEM))
-		simplify_replace_rtx (REG_NOTES (libcall_insn),
-				      sets[i].orig_src, copy_rtx (new));
+		{
+	          rtx note = find_reg_equal_equiv_note (libcall_insn);
+		  if (note != 0)
+		    XEXP (note, 0) = simplify_replace_rtx (XEXP (note, 0),
+							   sets[i].orig_src,
+							   copy_rtx (new));
+		}
 
 	      /* The result of apply_change_group can be ignored; see
 		 canon_reg.  */