2021-01-29 12:57:30 +03:00
|
|
|
module constants
|
|
|
|
|
|
|
|
|
|
// Commonly used constants across RNGs - some taken from "Numerical Recipes".
|
|
|
|
|
pub const (
|
2023-01-19 16:21:47 +03:00
|
|
|
lower_mask = u64(0x00000000FFFFFFFF)
|
|
|
|
|
max_u32 = u32(0xFFFFFFFF)
|
|
|
|
|
max_u64 = u64(0xFFFFFFFFFFFFFFFF)
|
|
|
|
|
u31_mask = u32(0x7FFFFFFF)
|
|
|
|
|
u63_mask = u64(0x7FFFFFFFFFFFFFFF)
|
|
|
|
|
// 23 bits for f32
|
|
|
|
|
ieee754_mantissa_f32_mask = (u32(1) << 23) - 1
|
|
|
|
|
// 52 bits for f64
|
|
|
|
|
ieee754_mantissa_f64_mask = (u64(1) << 52) - 1
|
|
|
|
|
// smallest mantissa with exponent 0 (un normalized)
|
|
|
|
|
reciprocal_2_23rd = 1.0 / f64(u32(1) << 23)
|
|
|
|
|
reciprocal_2_52nd = 1.0 / f64(u64(1) << 52)
|
2021-02-19 12:16:02 +03:00
|
|
|
)
|
