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next_pow2 optimized for > 2

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This commit is contained in:
Dominik Maier 2020-10-28 16:06:27 +01:00
parent 0b6c80133c
commit 7ae7febbf6
1 changed files with 0 additions and 4 deletions
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4
src/utils.rs
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@ -89,10 +89,6 @@ impl Xoshiro256StarRand {
/// Get the next higher power of two /// Get the next higher power of two
pub fn next_pow2(val: u64) -> u64 { pub fn next_pow2(val: u64) -> u64 {
// Early exit so we don't have to do a wrapping subtract;
if val <= 2 {
return val;
}
let mut out: u64 = val.wrapping_sub(1); let mut out: u64 = val.wrapping_sub(1);
out |= out >> 1; out |= out >> 1;
out |= out >> 2; out |= out >> 2;