2010-05-27  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/44284
	* tree-vect-stmts.c (vectorizable_assignment): Handle
	sign-changing conversions as simple copy.

	* gcc.dg/vect/vect-118.c: New testcase.
	* gcc.dg/vect/bb-slp-20.c: Adjust.
	* gcc.dg/vect/no-section-anchors-vect-36.c: Likewise.
	* gcc.dg/vect/slp-9.c: Likewise.
	* gcc.dg/vect/slp-reduc-4.c: Likewise.
	* gcc.dg/vect/vect-10.c: Likewise.
	* gcc.dg/vect/vect-109.c: Likewise.
	* gcc.dg/vect/vect-12.c: Likewise.
	* gcc.dg/vect/vect-36.c: Likewise.
	* gcc.dg/vect/vect-7.c: Likewise.
	* gcc.dg/vect/vect-iv-8.c: Likewise.
	* gcc.dg/vect/vect-multitypes-10.c: Likewise.
	* gcc.dg/vect/vect-multitypes-13.c: Likewise.
	* gcc.dg/vect/vect-multitypes-14.c: Likewise.
	* gcc.dg/vect/vect-multitypes-15.c: Likewise.
	* gcc.dg/vect/vect-multitypes-7.c: Likewise.
	* gcc.dg/vect/vect-multitypes-8.c: Likewise.
	* gcc.dg/vect/vect-multitypes-9.c: Likewise.
	* gcc.dg/vect/vect-reduc-dot-s16b.c: Likewise.
	* gcc.dg/vect/vect-reduc-dot-s8a.c: Likewise.
	* gcc.dg/vect/vect-reduc-dot-s8b.c: Likewise.
	* gcc.dg/vect/vect-reduc-dot-u16b.c: Likewise.
	* gcc.dg/vect/vect-strided-a-u32-mult.c: Likewise.
	* gcc.dg/vect/vect-strided-u32-mult.c: Likewise.
	* gcc.dg/vect/vect-widen-mult-s16.c: Likewise.
	* gcc.dg/vect/vect-widen-mult-s8.c: Likewise.
	* gcc.dg/vect/vect-widen-mult-sum.c: Likewise.
	* gcc.dg/vect/vect-widen-mult-u16.c: Likewise.

From-SVN: r159920