re PR middle-end/40460 (Enormous memory usage during compilation with -O2 or -O3...

re PR middle-end/40460 (Enormous memory usage during compilation with -O2 or -O3 optimizations.)

2009-06-17  Richard Guenther  <rguenther@suse.de>

	PR middle-end/40460
	* tree-chrec.h (build_polynomial_chrec): If we cannot determine
	if there is no evolution of left in the loop bail out.
	* tree-chrec.c (chrec_fold_multiply_poly_poly): CSE one
	chrec_fold_multiply.

	* g++.dg/torture/pr40460.C: New testcase.

From-SVN: r148603