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Optimize default RNG for the common case

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This commit is contained in:
Feoramund
2024-06-20 11:27:51 -04:00
parent 28e33d86de
commit 1dfc89567e
1 changed files with 16 additions and 9 deletions
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base/runtime/random_generator.odin
+7
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@@ -86,6 +86,12 @@ default_random_generator_proc :: proc(data: rawptr, mode: Random_Generator_Mode,
init(r, 0) init(r, 0)
} }
switch len(p) {
case size_of(u64):
// Fast path for a 64-bit destination.
(transmute(^u64)raw_data(p))^ = read_u64(r)
case:
// All other cases.
pos := i8(0) pos := i8(0)
val := u64(0) val := u64(0)
for &v in p { for &v in p {
@@ -97,6 +103,7 @@ default_random_generator_proc :: proc(data: rawptr, mode: Random_Generator_Mode,
val >>= 8 val >>= 8
pos -= 1 pos -= 1
} }
}
case .Reset: case .Reset:
seed: u64 seed: u64