[llvm] [X86] Optimize (a & 0xff) | ((b & 0xff) << 8) into high-byte register insertions (PR #214645)

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Fri Aug 7 12:47:19 PDT 2026

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AZero13 wrote:

Also, BEXTR is handled exclusively by custom C++ (matchBitExtract), which bypasses TableGen entirely f

https://github.com/llvm/llvm-project/pull/214645

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