2009-07-03  Richard Guenther  <rguenther@suse.de>

	PR middle-end/34163
	* tree-chrec.c (chrec_convert_1): Fold (T2)(t +- x) to
	(T2)t +- (T2)x if t +- x is known to not overflow and
	the conversion widens the operation.
	* Makefile.in (tree-chrec.o): Add $(FLAGS_H) dependency.

	* gfortran.dg/pr34163.f90: New testcase.

From-SVN: r149207