From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18896 invoked by alias); 25 Oct 2014 00:57:39 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 18841 invoked by uid 48); 25 Oct 2014 00:57:36 -0000 From: "wdijkstr at arm dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/61915] [AArch64] High amounts of GP to FP register moves using LRA on AArch64 Date: Sat, 25 Oct 2014 01:29:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: wdijkstr at arm dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: ramana at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-10/txt/msg01983.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61915 --- Comment #15 from Wilco --- (In reply to Evandro from comment #12) > (In reply to Evandro from comment #11) > > Do you have an idea of the performance impact of this patch? > > At least in Dhrystone, it improved by over 2% on A57. It was ~2% on SPECINT2k, ~3% on SPECFP2k. There were large gains on other benchmarks where the allocator had gone berserk on FP moves inside the hot loop. The removal of the redundant FP saves/restores in many functions helps as well.