2017-03-01  Richard Biener  <rguenther@suse.de>

	PR middle-end/79721
	* tree-chrec.c (chrec_evaluate): Perform computation of Newtons
	interpolating formula in wrapping arithmetic.
	(chrec_apply): Convert chrec_evaluate return value to wanted type.

	* gcc.dg/torture/pr79721.c: New testcase.

From-SVN: r245803