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math/rand math/bits dependency

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jakubtomsu
2026-02-17 18:34:37 +01:00
parent 97e09b19d1
commit e8aac50f8b
1 changed files with 8 additions and 4 deletions
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12
core/math/rand/rand_xoshiro256.odin
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@@ -3,8 +3,6 @@ package rand
import "base:intrinsics"
import "base:runtime"
import "core:math/bits"
/*
The state for a xoshiro256** pseudorandom generator.
*/
@@ -17,7 +15,7 @@ xoshiro256_random_generator_proc :: proc(data: rawptr, mode: runtime.Random_Gene
read_u64 :: proc "contextless" (r: ^Xoshiro256_Random_State) -> u64 {
// xoshiro256** output function and state transition
result := bits.rotate_left64(r.s[1] * 5, 7) * 9
result := rotate_left64(r.s[1] * 5, 7) * 9
t := r.s[1] << 17
r.s[2] = r.s[2] ~ r.s[0]
@@ -25,9 +23,15 @@ xoshiro256_random_generator_proc :: proc(data: rawptr, mode: runtime.Random_Gene
r.s[1] = r.s[1] ~ r.s[2]
r.s[0] = r.s[0] ~ r.s[3]
r.s[2] = r.s[2] ~ t
r.s[3] = bits.rotate_left64(r.s[3], 45)
r.s[3] = rotate_left64(r.s[3], 45)
return result
rotate_left64 :: proc "contextless" (x: u64, k: int) -> u64 {
n :: 64
s := uint(k) & (n-1)
return x << s | x >> (n-s)
}
}
@(thread_local)