gcc/
	PR tree-optimization/25125
	* convert.c (convert_to_integer): Don't narrow the type of a
	PLUX_EXPR or MINUS_EXPR if !flag_wrapv and the unwidened type
	is signed.

gcc/testsuite/
	PR tree-optimization/25125
	* gcc.dg/vect/vect-7.c, gcc.dg/vect/vect-reduc-2char.c,
	gcc.dg/vect/vect-reduc-2short.c: XFAIL.
	* gcc.c-torture/execute/pr25125.c: New.

From-SVN: r109065