2008-08-08  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/37056
	* gimple.h (gimple_assign_rhs_class): New helper function.
	* tree-ssa-loop-niter.c (get_val_for): Fix tuplification, handle
	unary operations properly.

	* gcc.c-torture/compile/pr37056.c: New testcase.

From-SVN: r138865