backport: [multiple changes]

backport: [multiple changes]

2018-06-07  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2018-05-04  Richard Biener  <rguenther@suse.de>

	PR middle-end/85588
	* fold-const.c (negate_expr_p): Restrict negation of operand
	zero of a division to when we know that can happen without
	overflow.
	(fold_negate_expr_1): Likewise.

	* gcc.dg/torture/pr85588.c: New testcase.
	* gcc.dg/torture/pr57656.c: Use dg-additional-options.

	2018-05-02  Richard Biener  <rguenther@suse.de>

	PR middle-end/85567
	* gimplify.c (gimplify_save_expr): When in SSA form allow
	SAVE_EXPRs to compute to SSA vars.

	* gcc.dg/torture/pr85567.c: New testcase.

	2018-05-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/85597
	* tree-vect-stmts.c (vectorizable_operation): For ternary SLP
	do not use split vect_get_vec_defs call but call vect_get_slp_defs
	directly.

	* gcc.dg/vect/pr85597.c: New testcase.

From-SVN: r261269