gcc/ChangeLog:

2017-11-07  Marc Glisse  <marc.glisse@inria.fr>

	* fold-const.c (negate_expr_p) [PLUS_EXPR, MINUS_EXPR]: Handle
	non-scalar integral types.
	* match.pd (negate_expr_p): Handle MINUS_EXPR.
	(-(A-B), -(~A)): New transformations.

gcc/testsuite/ChangeLog:

2017-11-07  Marc Glisse  <marc.glisse@inria.fr>

	* gcc.dg/tree-ssa/negminus.c: New test.

From-SVN: r254494