expr.c (expand_expr_real_1): Force subregs into a pseudo before applying gen_lowpart.

        * expr.c (expand_expr_real_1) <VIEW_CONVERT_EXPR>: Force subregs
        into a pseudo before applying gen_lowpart.

From-SVN: r103712

gcc/ChangeLog

+2005-08-31  Richard Henderson  <rth@redhat.com>
+
+	* expr.c (expand_expr_real_1) <VIEW_CONVERT_EXPR>: Force subregs
+	into a pseudo before applying gen_lowpart.
+
 2005-08-31  Geoffrey Keating  <geoffk@apple.com>
 
 	* doc/install.texi (Specific): Update cctools version required

gcc/expr.c

@@ -7544,7 +7544,11 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
       else if (TYPE_MODE (type) != BLKmode && GET_MODE (op0) != BLKmode
 	       && GET_MODE_SIZE (TYPE_MODE (type))
 		   == GET_MODE_SIZE (GET_MODE (op0)))
-	op0 = gen_lowpart (TYPE_MODE (type), op0);
+	{
+	  if (GET_CODE (op0) == SUBREG)
+	    op0 = force_reg (GET_MODE (op0), op0);
+	  op0 = gen_lowpart (TYPE_MODE (type), op0);
+	}
       /* If both modes are integral, then we can convert from one to the
 	 other.  */
       else if (SCALAR_INT_MODE_P (GET_MODE (op0))