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JIT: Emulate missing x86 shift instructions for xplat intrinsics #111108

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@saucecontrol saucecontrol commented Jan 6, 2025

This extends the byte shift emulation to handle arithmetic shift and adds emulation of qword arithmetic shift for platforms without AVX-512/AVX10.

SPMI diffs show the updated codegen.

@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 Jan 6, 2025
@dotnet-policy-service dotnet-policy-service bot added the community-contribution Indicates that the PR has been added by a community member label Jan 6, 2025
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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@saucecontrol saucecontrol marked this pull request as ready for review January 7, 2025 03:30
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CC @tannergooding

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