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Avoid __vectorcall on ARM64EC #4600

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Apr 19, 2024
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The documentation says "On ARM64EC, __vectorcall is unsupported and rejected by the compiler." I'm not sure why our usage isn't being rejected, but we have confirmation from the compiler team that ARM64 doesn't currently accept __vectorcall so we should avoid it.

Fixes #4596

The documentation says "On ARM64EC, `__vectorcall` is unsupported and rejected by the compiler." I'm not sure why our usage isn't being rejected, but we have confirmation from the compiler team that ARM64 doesn't currently accept `__vectorcall` so we should avoid it.

Fixes microsoft#4596
@CaseyCarter CaseyCarter added bug Something isn't working ARM64 Related to the ARM64 architecture labels Apr 18, 2024
@CaseyCarter CaseyCarter requested a review from a team as a code owner April 18, 2024 16:22
@StephanTLavavej StephanTLavavej self-assigned this Apr 18, 2024
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

@StephanTLavavej StephanTLavavej merged commit 726ebe7 into microsoft:main Apr 19, 2024
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Thanks for restoring balance to the force, reducing "vector"s here while @AlexGuteniev adds vectorization everywhere! 🤪 😹 🤣

@CaseyCarter CaseyCarter deleted the vectorcall branch August 20, 2024 20:54
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<type_traits>: __vectorcall _should_ be rejected on ARM64EC but isn't
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