2013-11-18 Richard Biener <rguenther@suse.de>

2013-11-18  Richard Biener  <rguenther@suse.de>

	Backport from mainline
	2013-10-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/58794
	* fold-const.c (operand_equal_p): Compare FIELD_DECL operand
	of COMPONENT_REFs with OEP_CONSTANT_ADDRESS_OF left in place.

	* c-c++-common/torture/pr58794-1.c: New testcase.
	* c-c++-common/torture/pr58794-2.c: Likewise.

	2013-10-21  Richard Biener  <rguenther@suse.de>

	PR middle-end/58742
	* fold-const.c (fold_binary_loc): Fold ((T) (X /[ex] C)) * C
	to (T) X for sign-changing conversions (or no conversion).

	* c-c++-common/fold-divmul-1.c: New testcase.

	2013-11-06  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/58653
	* tree-predcom.c (ref_at_iteration): Rewrite to generate
	a MEM_REF.
	(prepare_initializers_chain): Adjust.

	* gcc.dg/tree-ssa/predcom-6.c: New testcase.
	* gcc.dg/tree-ssa/predcom-7.c: Likewise.

	PR tree-optimization/59047
	* tree-predcom.c (ref_at_iteration): Handle bitfield accesses
	properly.

	* gcc.dg/torture/pr59047.c: New testcase.

	2013-10-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/58143
	* tree-ssa-loop-im.c (arith_code_with_undefined_signed_overflow):
	New function.
	(rewrite_to_defined_overflow): Likewise.
	(move_computations_dom_walker::before_dom): Rewrite stmts
	with undefined signed overflow that are not always executed
	into unsigned arithmetic.

	* gcc.dg/torture/pr58143-1.c: New testcase.
	* gcc.dg/torture/pr58143-2.c: Likewise.
	* gcc.dg/torture/pr58143-3.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_8-branch@204965 138bc75d-0d04-0410-961f-82ee72b054a4