re PR target/55941 (Strange copy of double (in struct) to stack)

PR target/55941
        * lower-subreg.c (simple_move): Check dest mode instead of src mode.

From-SVN: r196071

gcc/ChangeLog

+2013-02-14  Richard Henderson  <rth@redhat.com>
+
+	PR target/55941
+	* lower-subreg.c (simple_move): Check dest mode instead of src mode.
+
 2013-02-14  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* collect2-aix.h: Define F_LOADONLY.

gcc/lower-subreg.c

@@ -343,7 +343,7 @@ simple_move (rtx insn, bool speed_p)
      registers.  That means that we can't decompose if this is a
      non-integer mode for which there is no integer mode of the same
      size.  */
-  mode = GET_MODE (SET_SRC (set));
+  mode = GET_MODE (SET_DEST (set));
   if (!SCALAR_INT_MODE_P (mode)
       && (mode_for_size (GET_MODE_SIZE (mode) * BITS_PER_UNIT, MODE_INT, 0)
 	  == BLKmode))