2015-11-18 Richard Biener <rguenther@suse.de>

2015-11-18  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2015-10-28  Richard Biener  <rguenther@suse.de>

	PR middle-end/68067
	* fold-const.c (negate_expr_p): We cannot negate plus or minus
	if overflow is not wrapping.  Likewise multiplication unless
	one operand is constant and not power of two.
	(fold_negate_expr): Adjust accordingly.

	* gcc.dg/torture/pr68067-1.c: New testcase.
	* gcc.dg/torture/pr68067-2.c: Likewise.

	2015-10-26  Richard Biener  <rguenther@suse.de>
		Dominik Vogt  <vogt@linux.vnet.ibm.com>

	PR middle-end/67443
	* alias.c (ao_ref_from_mem): Remove promoted subreg handling.
	Properly prune ref->ref for accesses outside of ref.

	* gcc.target/s390/pr67443.c: New testcase.

	2015-10-20  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/68017
	* tree-tailcall.c (eliminate_tail_call): Remove stmts backwards.

	* gcc.dg/torture/pr68017.c: New testcase.

	2015-09-23   Richard Biener  <rguenther@suse.de>

	PR middle-end/67662
	* fold-const.c (fold_binary_loc): Do not reassociate two vars with
	undefined overflow unless they will cancel out.

	* gcc.dg/ubsan/pr67662.c: New testcase.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-5-branch@230542 138bc75d-0d04-0410-961f-82ee72b054a4