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[Bug tree-optimization/83668] [8 Regression] wrong code with -O -fno-tree-dominator-opts -fgraphite-identity
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 09 Jan 2018 13:36:14 +0000
- Subject: [Bug tree-optimization/83668] [8 Regression] wrong code with -O -fno-tree-dominator-opts -fgraphite-identity
- Auto-submitted: auto-generated
- References: <bug-83668-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83668
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jan 9 13:35:43 2018
New Revision: 256381
URL: https://gcc.gnu.org/viewcvs?rev=256381&root=gcc&view=rev
Log:
2018-01-09 Richard Biener <rguenther@suse.de>
PR tree-optimization/83668
* graphite.c (canonicalize_loop_closed_ssa): Add edge argument,
move prologue...
(canonicalize_loop_form): ... here, renamed from ...
(canonicalize_loop_closed_ssa_form): ... this and amended to
swap successor edges for loop exit blocks to make us use
the RPO order we need for initial schedule generation.
* gcc.dg/graphite/pr83668.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/graphite/pr83668.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/graphite.c
trunk/gcc/testsuite/ChangeLog