Add basic support for Windows ARM64EC #417
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Make libdeflate build for ARM64EC, and add ARM64EC to GitHub Actions. ARM64EC pretends to be x86_64, but lots of x86_64 functionality is broken: - 256-bit and 512-bit vectors are unsupported - _mm*_load*() do not accept void pointers - _m_prefetchw() is not supported - bmi2 intrinsics are not supported For now just do the simple thing and treat ARM64EC as a generic architecture, so do not try to use any of the x86_64 optimized code. The premise of optimizing for ARM64EC seems questionable, after all, given that proper ARM64 builds are fully supported.
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