re PR tree-optimization/30318 (VRP does not create ANTI_RANGEs on overflow)

re PR tree-optimization/30318 (VRP does not create ANTI_RANGEs on overflow)

2012-06-20  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/30318
	* tree-vrp.c (range_int_cst_p): Do not reject overflowed
	constants here.
	(range_int_cst_singleton_p): But explicitely here.
	(zero_nonzero_bits_from_vr): And here.
	(extract_range_from_binary_expr_1): Re-implement PLUS_EXPR
	to cover all cases we can perform arbitrary precision
	arithmetic with double-ints.
	(intersect_ranges): Handle adjacent anti-ranges.

	* gcc.dg/tree-ssa/vrp69.c: New testcase.

From-SVN: r188827