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SIMD multiplication by scalar UInt64 can produce incorrect results on Arm64 #106838

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tannergooding opened this issue Aug 22, 2024 · 2 comments · Fixed by #106839
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SIMD multiplication by scalar UInt64 can produce incorrect results on Arm64 #106838

tannergooding opened this issue Aug 22, 2024 · 2 comments · Fixed by #106839
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area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI in-pr There is an active PR which will close this issue when it is merged
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9.0.0

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@tannergooding
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The following program should print <25, 25> but instead may print a random value for the second element.

ulong val = 5;
Vector128<ulong> x = Vector128.Create<ulong>(val);
Console.WriteLine(x * 5UL);
@tannergooding tannergooding added this to the 9.0.0 milestone Aug 22, 2024
@tannergooding tannergooding self-assigned this Aug 22, 2024
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Aug 22, 2024
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

@tannergooding tannergooding mentioned this issue Aug 22, 2024
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@dotnet-policy-service dotnet-policy-service bot added the in-pr There is an active PR which will close this issue when it is merged label Aug 22, 2024
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This was found while working on #106594

@tannergooding tannergooding mentioned this issue Aug 26, 2024
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area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI in-pr There is an active PR which will close this issue when it is merged
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9.0.0
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Ensure that Arm64 correctly handles multiplication of simd by a 64-bit scalar tannergooding/runtime
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@tannergooding