[patch] expr.c: Return const0_rtx when expanding MODIFY_EXPR.

[Kazu Hirata]

Hi,

Attached is a patch to have expand_expr_real_1 to return const0_rtx
when handling MODIFY_EXPR.

The patch makes the MODIFY_EXPR case consistent with the rest of
expand_expr_real_1 in that it returns const0_rtx when it has nothing
to return.

Tested on i686-pc-linux-gnu.  Committed as preapproved by Roger Sayle.

Kazu Hirata

2004-10-19  Kazu Hirata  <kazu@cs.umass.edu>

	* expr.c (expand_expr_real_1) <MODIFY_EXPR>: Remove
	unnecessary assignments to temp.  Return const0_rtx.

Index: expr.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/expr.c,v
retrieving revision 1.728
diff -u -p -r1.728 expr.c
--- expr.c	18 Oct 2004 21:18:23 -0000	1.728
+++ expr.c	19 Oct 2004 03:40:56 -0000
@@ -8067,8 +8067,6 @@ expand_expr_real_1 (tree exp, rtx target
 	tree lhs = TREE_OPERAND (exp, 0);
 	tree rhs = TREE_OPERAND (exp, 1);
 
-	temp = 0;
-
 	gcc_assert (ignore);
 
 	/* Check for |= or &= of a bitfield of size one into another bitfield
@@ -8102,9 +8100,9 @@ expand_expr_real_1 (tree exp, rtx target
 	    return const0_rtx;
 	  }
 
-	temp = expand_assignment (lhs, rhs, 0);
+	expand_assignment (lhs, rhs, 0);
 
-	return temp;
+	return const0_rtx;
       }
 
     case RETURN_EXPR: