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[util] Add 64-bit lzcnt

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Philip Rebohle 2024-09-21 22:46:35 +02:00 committed by Philip Rebohle
parent 343af21594
commit 1eec969448
1 changed files with 12 additions and 0 deletions
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12
src/util/util_bit.h
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@ -152,6 +152,18 @@ namespace dxvk::bit {
#endif
}
inline uint32_t lzcnt(uint64_t n) {
#if defined(DXVK_ARCH_X86_64) && ((defined(_MSC_VER) && !defined(__clang__)) || defined(__LZCNT__))
return _lzcnt_u64(n);
#elif defined(DXVK_ARCH_X86_64) && (defined(__GNUC__) || defined(__clang__))
return n != 0 ? __builtin_clzll(n) : 64;
#else
uint32_t lo = uint32_t(n);
uint32_t hi = uint32_t(n >> 32u);
return hi ? lzcnt(hi) : lzcnt(lo) + 32u;
#endif
}
template<typename T>
uint32_t pack(T& dst, uint32_t& shift, T src, uint32_t count) {
constexpr uint32_t Bits = 8 * sizeof(T);