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#pragma once #include "other/int_alias.cpp" #include <array> usize countr_zero(u64 x) { if (x == 0) return 64; #ifdef __GNUC__ return __builtin_ctzll(x); #else constexpr std::array<usize, 64> table = { 0, 1, 2, 7, 3, 13, 8, 27, 4, 33, 14, 36, 9, 49, 28, 19, 5, 25, 34, 17, 15, 53, 37, 55, 10, 46, 50, 39, 29, 42, 20, 57, 63, 6, 12, 26, 32, 35, 48, 18, 24, 16, 52, 54, 45, 38, 41, 56, 62, 11, 31, 47, 23, 51, 44, 40, 61, 30, 22, 43, 60, 21, 59, 58}; return table[(x & ~x + 1) * 0x218A7A392DD9ABF >> 58 & 0x3F]; #endif }
#line 2 "other/countr_zero.cpp" #line 2 "other/int_alias.cpp" #include <cstddef> #include <cstdint> using i32 = std::int32_t; using i64 = std::int64_t; using u32 = std::uint32_t; using u64 = std::uint64_t; using isize = std::ptrdiff_t; using usize = std::size_t; #line 4 "other/countr_zero.cpp" #include <array> usize countr_zero(u64 x) { if (x == 0) return 64; #ifdef __GNUC__ return __builtin_ctzll(x); #else constexpr std::array<usize, 64> table = { 0, 1, 2, 7, 3, 13, 8, 27, 4, 33, 14, 36, 9, 49, 28, 19, 5, 25, 34, 17, 15, 53, 37, 55, 10, 46, 50, 39, 29, 42, 20, 57, 63, 6, 12, 26, 32, 35, 48, 18, 24, 16, 52, 54, 45, 38, 41, 56, 62, 11, 31, 47, 23, 51, 44, 40, 61, 30, 22, 43, 60, 21, 59, 58}; return table[(x & ~x + 1) * 0x218A7A392DD9ABF >> 58 & 0x3F]; #endif }