2017-04-07  Richard Biener  <rguenther@suse.de>

	PR middle-end/80341
	* tree.c (get_unwidened): Also handle ! for_type case for
	INTEGER_CSTs.
	* convert.c (do_narrow): Split out from ...
	(convert_to_integer_1): ... here.  Do not pass final truncation
	type to get_unwidened for TRUNC_DIV_EXPR.

	* gcc.dg/torture/pr80341.c: New testcase.

From-SVN: r246756