From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id D7B813858C36; Mon, 27 Mar 2023 14:55:09 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D7B813858C36 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1679928909; bh=9fld6AQJ4n1Lk74rO7Irg0otZwNkZvnbOQxwTO5WKhs=; h=From:To:Subject:Date:In-Reply-To:References:From; b=LvYzuFe/1HB9EtpIivU6cg9OJNLC11ZthZ9r87xb3Rp+izzdg/ItHjClGoZtuc9QO xkmQ0Yj1uoF2ypTRA6log1/uQgqTIXHtfiTKmpQ6UgZxin6LMngVDiNuHUs3+wH0BA urPPSHYJTN8BN00spcmILDGKhOkxpIgh9bsYUU60= From: "andrew.carlotti at arm dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug bootstrap/84402] [meta] GCC build system: parallelism bottleneck Date: Mon, 27 Mar 2023 14:55:07 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: bootstrap X-Bugzilla-Version: unknown X-Bugzilla-Keywords: build, meta-bug X-Bugzilla-Severity: normal X-Bugzilla-Who: andrew.carlotti at arm dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D84402 Andrew Carlotti changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |andrew.carlotti at arm dot= com --- Comment #58 from Andrew Carlotti --- Since November 2021, there's been a significant regression in the compile t= ime for gimple-match.cc during a bootstrap build (+100% in Stage 2, +73% in Sta= ge 3), with this regression accounting for over 20% of the current total boots= trap time on some aarch64 machines. Most of the change in compile time is due to the following 6 commits (of wh= ich one is a performance improvement, and one only regressed the Stage 2 build): 7df89377a7ae3906255e38a79be8e5d962c3a0df 24th November 2021 Enhance optimize_atomic_bit_test_and to handle truncation. (Hongtao Liu) Stage 2: +27% Stage 3: +33% 9a53101caadae1b5c8d791d247b05268ee4f7f92 16th May 2022 Add MIN/MAX folding from fold_cond_expr_with_comparison to match.pd (Richard Biener) Stage 2: +15% Stage 3: +15% 409978d58dafa689c5b3f85013e2786526160f2c 9th August 2022 tree-optimization/106514 - add --param max-jump-thread-paths (Richard Biene= r) Stage 2: -7% Stage 3: -10% 011d0a033ab370ea38b06b813ac62be8dde0801b 18th August 2022 Make path_range_query standalone and add reset_path. (Aldy Hernandez) Stage 2: +5% Stage 3: +0% 4d9db4bdd458a4b526f59e4bc5bbd549d3861cea 12th December 2022 middle-end: simplify complex if expressions where comparisons are inverse of one another. (Tamar Christina) Stage 2: +10% Stage 3: +9% 733a1b777f16cd397b43a242d9c31761f66d3da8 13th January 2023 sched-deps: do not schedule pseudos across calls [PR108117] (Alexander Mona= kov) Stage 2: +14% Stage 3: +9%=