src/math/iroot/sqrt/lib.hpp
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #include "../../../util/alias/others/lib.hpp" | ||
| 4 | |||
| 5 | namespace tifa_libs { | ||
| 6 | |||
| 7 | 817554 | CEXP u32 isqrt(u64 x) NE { | |
| 8 |
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817554 | retif_((!x) [[unlikely]], 0); |
| 9 | #pragma GCC diagnostic ignored "-Wconversion" | ||
| 10 | 795539 | csint sh = 31 - (std::bit_width(x) - 1) / 2; | |
| 11 | #pragma GCC diagnostic warning "-Wconversion" | ||
| 12 | 1591078 | u32 u = [](u64 x) NE { | |
| 13 | 795539 | CEXP arr<u8, 192> TAB{128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 144, 145, 146, 147, 148, 149, 150, 151, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167, 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176, 177, 178, 179, 179, 180, 181, 181, 182, 183, 183, 184, 185, 186, 186, 187, 188, 188, 189, 190, 190, 191, 192, 192, 193, 194, 194, 195, 196, 196, 197, 198, 198, 199, 200, 200, 201, 201, 202, 203, 203, 204, 205, 205, 206, 206, 207, 208, 208, 209, 210, 210, 211, 211, 212, 213, 213, 214, 214, 215, 216, 216, 217, 217, 218, 219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225, 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233, 233, 234, 234, 235, 235, 236, 237, 237, 238, 238, 239, 239, 240, 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 246, 246, 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255, 255}; | |
| 14 | 795539 | u32 u = TAB[(x >> 56) - 64]; | |
| 15 | 795539 | u = (u << 7) + (u32)(x >> 41) / u; | |
| 16 | 795539 | return (u << 15) + (u32)((x >> 17) / u); | |
| 17 | 795539 | }(x << 2 * sh); | |
| 18 | 795539 | u >>= sh, u -= (u64)u * u > x; | |
| 19 | 795539 | return u; | |
| 20 | } | ||
| 21 | |||
| 22 | } // namespace tifa_libs | ||
| 23 |