(push_reload): Don't reload inside a SUBREG when SUBREG_WORD is

nonzero.

From-SVN: r9757

gcc/reload.c

@@ -798,9 +798,11 @@ push_reload (in, out, inloc, outloc, class,
 
      Finally, reload the inner expression if it is a register that is in
      the class whose registers cannot be referenced in a different size
-     and M1 is not the same size as M2.  */
+     and M1 is not the same size as M2.  If SUBREG_WORD is nonzero, we
+     cannot reload just the inside since we might end up with the wrong
+     register class. */
 
-  if (in != 0 && GET_CODE (in) == SUBREG
+  if (in != 0 && GET_CODE (in) == SUBREG && SUBREG_WORD (in) == 0
 #ifdef CLASS_CANNOT_CHANGE_SIZE
       && class != CLASS_CANNOT_CHANGE_SIZE
 #endif
@@ -898,7 +900,7 @@ push_reload (in, out, inloc, outloc, class,
      storing in a subreg is entitled to clobber it all
      (except in the case of STRICT_LOW_PART,
      and in that case the constraint should label it input-output.)  */
-  if (out != 0 && GET_CODE (out) == SUBREG
+  if (out != 0 && GET_CODE (out) == SUBREG && SUBREG_WORD (out) == 0
 #ifdef CLASS_CANNOT_CHANGE_SIZE
       && class != CLASS_CANNOT_CHANGE_SIZE
 #endif