re PR tree-optimization/71824 (ICE when compiling libiberty with Graphite loop optimi...

re PR tree-optimization/71824 (ICE when compiling libiberty with Graphite loop optimizations)

2017-02-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71824
	* graphite-scop-detection.c (scop_detection::build_scop_breadth):
	Verify the loops are valid in the merged SESE region.
	(scop_detection::can_represent_loop_1): Check analyzing the
	evolution of the number of iterations in the region succeeds.

	* gcc.dg/graphite/pr71824.c: New testcase.

From-SVN: r245081