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Investigate the encounters of "undefined use at" in register allocator #45238

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kunalspathak opened this issue Nov 25, 2020 · 1 comment · Fixed by #56439
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Investigate the encounters of "undefined use at" in register allocator #45238

kunalspathak opened this issue Nov 25, 2020 · 1 comment · Fixed by #56439
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@kunalspathak
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area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI Priority:3 Work that is nice to have
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6.0.0

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@kunalspathak
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kunalspathak commented Nov 25, 2020 •
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In JITDump, I occasionally see "LocalVar V09: undefined use at 1281" printed that comes from this line. Investigate what is causing it. I am not sure if it happens only for EHWriteThru or not but ideally, we should assert() for such cases.

Here is a repro:

set COMPlus_JitDump=Drive
set COMPlus_EnableEHWriteThru=1
set COMPlus_TieredCompilation=0

CoreRun.exe D:\git\jitutils\bin\pmi.dll DRIVEALL-QUIET %CORE_ROOT%\System.Text.Encoding.Extensions.dll
@Dotnet-GitSync-Bot Dotnet-GitSync-Bot added area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI untriaged New issue has not been triaged by the area owner labels Nov 25, 2020
@JulieLeeMSFT JulieLeeMSFT removed the untriaged New issue has not been triaged by the area owner label Nov 30, 2020
@JulieLeeMSFT JulieLeeMSFT added this to the 6.0.0 milestone Nov 30, 2020
@kunalspathak kunalspathak added the Priority:3 Work that is nice to have label Jun 4, 2021
@kunalspathak
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kunalspathak commented Jun 4, 2021 •
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I will try to get to this in .NET6.0, but marking it as Pri3.

@kunalspathak kunalspathak mentioned this issue Jul 27, 2021
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@kunalspathak kunalspathak

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area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI Priority:3 Work that is nice to have
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.NET Core CodeGen
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6.0.0
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Assert if we find undefined use during interval validation kunalspathak/runtime
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@kunalspathak @Dotnet-GitSync-Bot @JulieLeeMSFT