* Makefile.in (tree-ssa-loop-endcond.o): Add.

	* tree-flow.h (select_condition_shape): Declare.
	* tree-ssa-loop-endcond.c: New file.
	* tree-ssa-loop-ivcanon.c: Extend comments.
	* tree-ssa-loop-ivopts.c (struct cost_pair): Add cmp field.
	(add_iv_value_candidates): Add all_important argument.  For decreasing
	ivs, add iv with final value zero.
	(add_old_iv_candidates): Use add_iv_value_candidates.
	(add_derived_ivs_candidates): Add argument to add_iv_value_candidates.
	(set_use_iv_cost): Add cmp argument.
	(set_use_iv_cost_infinity, set_use_iv_cost_zero,
	set_use_iv_cost_generic, set_use_iv_cost_outer,
	set_use_iv_cost_compare): New functions.
	(determine_use_iv_cost_generic, determine_use_iv_cost_address,
	determine_use_iv_cost_outer): Use them.
	(cand_value_at, iv_elimination_compare): Removed.
	(iv_period): Moved to tree-ssa-loop-endcond.c.
	(may_eliminate_iv): Use select_condition_shape.
	(compare_cost): New function.
	(determine_use_iv_cost_condition): Use set_use_iv_cost_compare and
	compare_cost.
	(determine_use_iv_costs): Dump value and cmp fields of cost pair.
	(try_replacing_cands, minor_adjustments): New functions.
	(find_optimal_iv_set): Call minor_adjustments.
	(rewrite_use_compare): Use cmp field of cost pair.
	* tree-ssa-loop-niter.c (zero_p, nonzero_p): Moved to ...
	* tree.c (zero_p, nonzero_p): ... here.
	(signed_type_for): Generate a signed integer type for pointers.
	* tree.h (nonzero_p): Declare.


git-svn-id: https://gcc.gnu.org/svn/gcc/branches/killloop-branch@103769 138bc75d-0d04-0410-961f-82ee72b054a4

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