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