re PR tree-optimization/59651 (Vectorizer failing to spot dependence causes incorrect code generation.)

2014-01-03  Bingfeng Mei <bmei@broadcom.com>

	PR tree-optimization/59651
	* tree-vect-loop-manip.c (vect_create_cond_for_alias_checks): 
	Address	range for negative step should be added by TYPE_SIZE_UNIT.

	PR tree-optimization/59651
	* gcc.dg/torture/pr59651.c: New test.
	* gcc.dg/vect/pr59651.c: Ditto.

From-SVN: r206319