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[util] Add 64-bit lzcnt
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@ -152,6 +152,18 @@ namespace dxvk::bit {
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#endif
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}
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inline uint32_t lzcnt(uint64_t n) {
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#if defined(DXVK_ARCH_X86_64) && ((defined(_MSC_VER) && !defined(__clang__)) || defined(__LZCNT__))
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return _lzcnt_u64(n);
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#elif defined(DXVK_ARCH_X86_64) && (defined(__GNUC__) || defined(__clang__))
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return n != 0 ? __builtin_clzll(n) : 64;
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#else
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uint32_t lo = uint32_t(n);
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uint32_t hi = uint32_t(n >> 32u);
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return hi ? lzcnt(hi) : lzcnt(lo) + 32u;
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#endif
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}
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template<typename T>
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uint32_t pack(T& dst, uint32_t& shift, T src, uint32_t count) {
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constexpr uint32_t Bits = 8 * sizeof(T);
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