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 <efrie...@quicinc.com> wrote:
>
> 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.
>
>
>
> If it’s non-determinism, you could try to use opt-bisect-limit to figure out
> which pass is non-deterministic.
>
>
>
> -Eli
>
>
>
> From: cfe-dev <cfe-dev-boun...@lists.llvm.org> On Behalf Of Brian Cain via
> cfe-dev
> Sent: Tuesday, February 12, 2019 4:38 PM
> To: Hans Wennborg <h...@chromium.org>
> Cc: LLVM Development List <llvm-...@lists.llvm.org>; Release-testers
> <release-test...@lists.llvm.org>; clangd-...@lists.llvm.org; openmp-dev
> (openmp-...@lists.llvm.org) <openmp-...@lists.llvm.org>; LLDB Dev
> <lldb-dev@lists.llvm.org>; cfe-dev <cfe-...@lists.llvm.org>;
> libcxx-...@lists.llvm.org
> Subject: [EXT] Re: [cfe-dev] [Release-testers] [8.0.0 Release] rc2 has been
> tagged
>
>
>
> Any tips or suggestions on how to isolate or identify this defect? It seems
> non-trivial to bisect this failure.
>
>
>
> Hans: presumably this bug should block the 8.0 release?
>
>
>
> On Mon, Feb 11, 2019 at 8:37 AM Brian Cain <brian.c...@gmail.com> wrote:
>
> 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:
>
>
>
> # diff x86isel_p{2,3}.s
>
> 2c2
>
> <
> Phase2/Release/llvmCore-8.0.0-rc2.obj/lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86ISelLowering.cpp.o:
> file format elf64-x86-64
>
> ---
>
> > Phase3/Release/llvmCore-8.0.0-rc2.obj/lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86ISelLowering.cpp.o:
> > file format elf64-x86-64
>
> 121757c121757
>
> < 863: 48 8b 84 24 e0 05 00 mov 0x5e0(%rsp),%rax
>
> ---
>
> > 863: 48 8b 84 24 b0 01 00 mov 0x1b0(%rsp),%rax
>
> 121759c121759
>
> < 86b: 48 33 84 24 b0 01 00 xor 0x1b0(%rsp),%rax
>
> ---
>
> > 86b: 48 33 84 24 e0 05 00 xor 0x5e0(%rsp),%rax
>
> 121761,121762c121761,121762
>
> < 873: 8b 8c 24 e8 05 00 00 mov 0x5e8(%rsp),%ecx
>
> < 87a: 33 8c 24 b8 01 00 00 xor 0x1b8(%rsp),%ecx
>
> ---
>
> > 873: 8b 8c 24 b8 01 00 00 mov 0x1b8(%rsp),%ecx
>
> > 87a: 33 8c 24 e8 05 00 00 xor 0x5e8(%rsp),%ecx
>
>
>
>
>
> On Sat, Feb 9, 2019 at 9:54 AM Brian Cain <brian.c...@gmail.com> wrote:
>
> 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.
>
>
>
> I can pass along logs if anyone wants to investigate.
>
>
>
> On Thu, Feb 7, 2019 at 9:41 AM Hans Wennborg via Release-testers
> <release-test...@lists.llvm.org> wrote:
>
> Dear testers,
>
> 8.0.0-rc2 has been tagged from the release_80 branch at r353413.
>
> Please run the test script, share your results, and upload binaries.
>
> I'll get the source tarballs and docs published as soon as possible,
> and binaries as they become available.
>
> Thanks,
> Hans
> _______________________________________________
> Release-testers mailing list
> release-test...@lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/release-testers
>
>
>
>
>
>
>
> --
>
> -Brian
>
>
>
>
> --
>
> -Brian
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