expmed.c (extract_bit_field): When extracting from non-integer mode...

	* expmed.c (extract_bit_field): When extracting from non-integer mode,
	force a SUBREG into a register because we may be taking a further
	SUBREG of it.

From-SVN: r91361

gcc/ChangeLog

+2004-11-26  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
+
+	* expmed.c (extract_bit_field): When extracting from non-integer mode,
+	force a SUBREG into a register because we may be taking a further
+	SUBREG of it.
+
 2004-11-27  Di-an Jan  <dianj@freeshell.org>
 
 	* doc/contrib.texi (Tim Josling): Remove nesting quotation marks.

gcc/expmed.c

@@ -1163,13 +1163,12 @@ extract_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
     enum machine_mode imode = int_mode_for_mode (GET_MODE (op0));
     if (imode != GET_MODE (op0))
       {
-	if (MEM_P (op0))
-	  op0 = adjust_address (op0, imode, 0);
-	else
-	  {
-	    gcc_assert (imode != BLKmode);
-	    op0 = gen_lowpart (imode, op0);
-	  }
+	op0 = gen_lowpart (imode, op0);
+
+	/* If we got a SUBREG, force it into a register since we aren't going
+	   to be able to do another SUBREG on it.  */
+	if (GET_CODE (op0) == SUBREG)
+	  op0 = force_reg (imode, op0);
       }
   }