r255828 - in /branches/gcc-7-branch/gcc: Change...

[amker@gcc.gnu.org]

Author: amker
Date: Tue Dec 19 15:25:56 2017
New Revision: 255828

URL: https://gcc.gnu.org/viewcvs?rev=255828&root=gcc&view=rev
Log:

	Backport from mainline
	2017-11-15  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/82726
	PR tree-optimization/70754
	* tree-predcom.c (order_drefs_by_pos): New function.
	(combine_chains): Move code setting has_max_use_after to...
	(try_combine_chains): ...here.  New parameter.  Sort combined chains
	according to position information.
	(tree_predictive_commoning_loop): Update call to above function.
	(update_pos_for_combined_chains, pcom_stmt_dominates_stmt_p): New.

	2017-11-15  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/82726
	Revert
	2017-01-23  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/70754
	* tree-predcom.c (stmt_combining_refs): New parameter INSERT_BEFORE.
	(reassociate_to_the_same_stmt): New parameter INSERT_BEFORE.  Insert
	combined stmt before it if not NULL.
	(combine_chains): Process refs reversely and compute dominance point
	for root ref.

	Revert
	2017-02-23  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/79663
	* tree-predcom.c (combine_chains): Process refs in reverse order
	only for ZERO length chains, and add explaining comment.

	gcc/testsuite

	Backport from mainline
	2017-11-15  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/82726
	* gcc.dg/tree-ssa/pr82726.c: New test.


Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.dg/tree-ssa/pr82726.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/testsuite/ChangeLog
    branches/gcc-7-branch/gcc/tree-predcom.c