2017-10-09  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82449
	* sese.c (scev_analyzable_p): Check whether the SCEV is linear.
	* tree-chrec.h (evolution_function_is_constant_p): Adjust to
	allow constant addresses.
	* tree-chrec.c (scev_is_linear_expression): Constant evolutions
	are linear.

	* gfortran.dg/graphite/pr82449.f: New testcase.

From-SVN: r253546