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[Bug target/82862] [8 Regression] SPEC CPU2006 465.tonto performance regression with r253975 (up to 40% drop for particular loop)
- 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: Fri, 16 Feb 2018 13:47:57 +0000
- Subject: [Bug target/82862] [8 Regression] SPEC CPU2006 465.tonto performance regression with r253975 (up to 40% drop for particular loop)
- Auto-submitted: auto-generated
- References: <bug-82862-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82862
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Feb 16 13:47:25 2018
New Revision: 257734
URL: https://gcc.gnu.org/viewcvs?rev=257734&root=gcc&view=rev
Log:
2018-02-16 Richard Biener <rguenther@suse.de>
PR tree-optimization/84037
PR tree-optimization/84016
PR target/82862
* config/i386/i386.c (ix86_builtin_vectorization_cost):
Adjust vec_construct for the fact we need additional higher latency
128bit inserts for AVX256 and AVX512 vector builds.
(ix86_add_stmt_cost): Scale vector construction cost for
elementwise loads.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c