misuse of TRULY_NOOP_TRUNCTION in expr.c

[David Goodwin]

>From todays cvs sources in expr.c line 1024:

	  /* Search for a mode to convert via.  */
	  for (intermediate = from_mode; intermediate != VOIDmode;
	       intermediate = GET_MODE_WIDER_MODE (intermediate))
	    if (((can_extend_p (to_mode, intermediate, unsignedp)
		  != CODE_FOR_nothing)
		 || (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (intermediate)
		     && TRULY_NOOP_TRUNCATION (to_mode, intermediate)))
		&& (can_extend_p (intermediate, from_mode, unsignedp)
		    != CODE_FOR_nothing))
	      {
		convert_move (to, convert_to_mode (intermediate, from,
						   unsignedp), unsignedp);
		return;
	      }


TRULY_NOOP_TRUNCATION should take two mode *sizes* (in bits), but
to_mode and intermediate are modes. So the use should be:

TRUELY_NOOP_TRUNCATION(GET_MODE_BITSIZE(to_mode),
                       GET_MODE_BITSIZE(intermediate))

- David

goodwin@tensilica.com