[llvm] [X86] Add ISD::MULHS/MULHU v4i64/v8i64 lowering (PR #169819)

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Tue Jun 23 23:53:42 PDT 2026

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Andarwinux wrote:

At least v8i64 looks acceptable, if v4i64 is unsure, could you temporarily remove v4i64 lowering?

https://github.com/llvm/llvm-project/pull/169819

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