[release/8.0] JIT: ensure AVX512 ternary operands aren't used twice #91883
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Don't spill unused zeros early; we might decide to use them later. Fixes #91796.
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch Issue DetailsBackport of #91851 to release/8.0 /cc @AndyAyersMS Customer ImpactTestingRiskIMPORTANT: If this backport is for a servicing release, please verify that:
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@tannergooding can you sign off on the back port? |
jeffschwMSFT
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Sep 11, 2023
tannergooding
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Sep 11, 2023
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Backport of #91851 to release/8.0
/cc @AndyAyersMS
Customer Impact
In some rare cases code that uses AVX-512 ternary intrinsics (eg
Avx512F.TernaryLogic) may cause the jit to crash.Testing
Verified repro no longer triggers the assert about duplicate tree IDs.
Risk
Low. AVX-512 is a new feature in .NET 8, this code path is exclusive to AVX-512 ternary intrinsics.