[lldb-dev] [cfe-dev] [Release-testers] [8.0.0 Release] rc2 has been tagged

[Hans Wennborg via lldb-dev]

I've filed https://bugs.llvm.org/show_bug.cgi?id=40714 to track this.

On Wed, Feb 13, 2019 at 2:02 AM Eli Friedman <efriedma at quicinc.com> wrote:
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> If each stage consistently produces the same object file, then treat it like any other miscompile: mix the object files created by a good/bad compiler to bisect which C++ file is getting miscompiled, then reduce the failure using opt-bisect-limit or bugpoint.  Or maybe you could try asan/ubsan first to rule out something silly.
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> If it’s non-determinism, you could try to use opt-bisect-limit to figure out which pass is non-deterministic.
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> -Eli
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> From: cfe-dev <cfe-dev-bounces at lists.llvm.org> On Behalf Of Brian Cain via cfe-dev
> Sent: Tuesday, February 12, 2019 4:38 PM
> To: Hans Wennborg <hans at chromium.org>
> Cc: LLVM Development List <llvm-dev at lists.llvm.org>; Release-testers <release-testers at lists.llvm.org>; clangd-dev at lists.llvm.org; openmp-dev (openmp-dev at lists.llvm.org) <openmp-dev at lists.llvm.org>; LLDB Dev <lldb-dev at lists.llvm.org>; cfe-dev <cfe-dev at lists.llvm.org>; libcxx-dev at lists.llvm.org
> Subject: [EXT] Re: [cfe-dev] [Release-testers] [8.0.0 Release] rc2 has been tagged
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> Any tips or suggestions on how to isolate or identify this defect?  It seems non-trivial to bisect this failure.
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> Hans: presumably this bug should block the 8.0 release?
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> On Mon, Feb 11, 2019 at 8:37 AM Brian Cain <brian.cain at gmail.com> wrote:
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> rc1 did not exhibit this mismatch.  A repeat of the rc2 build repeated the mismatch.  I diff'd the disassembly between phase 2 and phase 3 and the difference is the same on both builds.  The difference follows:
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> # diff x86isel_p{2,3}.s
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> 2c2
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> < Phase2/Release/llvmCore-8.0.0-rc2.obj/lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86ISelLowering.cpp.o:     file format elf64-x86-64
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> ---
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> > Phase3/Release/llvmCore-8.0.0-rc2.obj/lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86ISelLowering.cpp.o:     file format elf64-x86-64
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> 121757c121757
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> <      863:     48 8b 84 24 e0 05 00    mov    0x5e0(%rsp),%rax
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> ---
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> >      863:     48 8b 84 24 b0 01 00    mov    0x1b0(%rsp),%rax
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> 121759c121759
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> <      86b:     48 33 84 24 b0 01 00    xor    0x1b0(%rsp),%rax
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> ---
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> >      86b:     48 33 84 24 e0 05 00    xor    0x5e0(%rsp),%rax
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> 121761,121762c121761,121762
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> <      873:     8b 8c 24 e8 05 00 00    mov    0x5e8(%rsp),%ecx
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> <      87a:     33 8c 24 b8 01 00 00    xor    0x1b8(%rsp),%ecx
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> ---
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> >      873:     8b 8c 24 b8 01 00 00    mov    0x1b8(%rsp),%ecx
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> >      87a:     33 8c 24 e8 05 00 00    xor    0x5e8(%rsp),%ecx
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> On Sat, Feb 9, 2019 at 9:54 AM Brian Cain <brian.cain at gmail.com> wrote:
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> rc2 build on Ubuntu 16.04 saw a stage 2/3 mismatch on X86IselLowering.cpp.o -- I didn't try to build rc1 for 16.04 but I can try it now to see if it's there too.
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> I can pass along logs if anyone wants to investigate.
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> On Thu, Feb 7, 2019 at 9:41 AM Hans Wennborg via Release-testers <release-testers at lists.llvm.org> wrote:
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> Dear testers,
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> 8.0.0-rc2 has been tagged from the release_80 branch at r353413.
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> Please run the test script, share your results, and upload binaries.
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> I'll get the source tarballs and docs published as soon as possible,
> and binaries as they become available.
>
> Thanks,
> Hans
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> --
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> -Brian
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> --
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> -Brian