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[Bug tree-optimization/85757] tree optimizers fail to fully clean up fixed-size memcpy
- 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: Thu, 17 May 2018 06:58:17 +0000
- Subject: [Bug tree-optimization/85757] tree optimizers fail to fully clean up fixed-size memcpy
- Auto-submitted: auto-generated
- References: <bug-85757-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85757
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu May 17 06:57:45 2018
New Revision: 260306
URL: https://gcc.gnu.org/viewcvs?rev=260306&root=gcc&view=rev
Log:
2018-05-17 Richard Biener <rguenther@suse.de>
PR tree-optimization/85757
* tree-ssa-dse.c (dse_classify_store): Record a PHI def and
remove defs that only feed that PHI from further processing.
* gcc.dg/tree-ssa/ssa-dse-34.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-34.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-dse.c