Date: Thu, 18 Jun 2020 20:41:49 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 246630] stable/11 regression: base.txz reproducibility depends on number of cpu cores Message-ID: <bug-246630-227-BU7ItyYcPs@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-246630-227@https.bugs.freebsd.org/bugzilla/> References: <bug-246630-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246630 --- Comment #35 from commit-hook@freebsd.org --- A commit references this bug: Author: dim Date: Thu Jun 18 20:41:44 UTC 2020 New revision: 362341 URL: https://svnweb.freebsd.org/changeset/base/362341 Log: Merge commit 0cecafd647cc from llvm git (by Alina Sbirlea): [BasicAA] Make BasicAA a cfg pass. Summary: Part of the changes in D44564 made BasicAA not CFG only due to it using PhiAnalysisValues which may have values invalidated. Subsequent patches (rL340613) appear to have addressed this limitation. BasicAA should not be invalidated by non-CFG-altering passes. A concrete example is MemCpyOpt which preserves CFG, but we are testing it invalidates BasicAA. llvm-dev RFC: https://groups.google.com/forum/#!topic/llvm-dev/eSPXuWnNfzM Reviewers: john.brawn, sebpop, hfinkel, brzycki Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D74353 This fixes an issue with clang's -fintegrated-cc1 feature, which could make it output slightly different assembly code, depending on the way it was invoked. In r361755 we attempted to work around it by disabling the integrated cc1 stage, but it did not solve the root cause for all situations. Extensive testing and bisecting showed that the above change finally makes the output deterministic, even if -fintegrated-cc1 is on. Reported by: Fabian Keil <fk@fabiankeil.de> PR: 246630 MFC after: 3 days Changes: head/contrib/llvm-project/llvm/lib/Analysis/BasicAliasAnalysis.cpp --=20 You are receiving this mail because: You are the assignee for the bug.=
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