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[Bug tree-optimization/79725] Sinking opportunity missed if blocked by dead stmt
- 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: Mon, 24 Apr 2017 07:49:27 +0000
- Subject: [Bug tree-optimization/79725] Sinking opportunity missed if blocked by dead stmt
- Auto-submitted: auto-generated
- References: <bug-79725-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79725
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr 24 07:48:47 2017
New Revision: 247091
URL: https://gcc.gnu.org/viewcvs?rev=247091&root=gcc&view=rev
Log:
2017-04-24 Richard Biener <rguenther@suse.de>
PR tree-optimization/79725
* tree-ssa-sink.c (statement_sink_location): Return whether
failure reason was zero uses. Move that check later.
(sink_code_in_bb): Deal with zero uses by removing the stmt
if possible.
* gcc.dg/tree-ssa/ssa-sink-15.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-sink-15.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-sink.c