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frame: base 2 pow is just a shift left op (#5393)

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This commit is contained in:
Bernhard Schuster
2020-03-25 10:50:22 +01:00
committed by GitHub
parent 8a41ac664b
commit d4093af110
1 changed files with 4 additions and 4 deletions
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substrate/frame/staking/reward-curve/src/log.rs
+4 -4
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@@ -14,13 +14,13 @@ pub fn log2(p: u32, q: u32) -> u32 {
}
let mut n = 0u32;
while !(p >= 2u32.pow(n)*q) || !(p < 2u32.pow(n+1)*q) {
while !(p >= (1u32 << n)*q) || !(p < (1u32 << (n+1))*q) {
n += 1;
}
assert!(p < 2u32.pow(n+1) * q);
assert!(p < (1u32 << (n+1)) * q);
let y_num: u32 = (p - 2u32.pow(n) * q).try_into().unwrap();
let y_den: u32 = (p + 2u32.pow(n) * q).try_into().unwrap();
let y_num: u32 = (p - (1u32 << n) * q).try_into().unwrap();
let y_den: u32 = (p + (1u32 << n) * q).try_into().unwrap();
let _2_div_ln_2 = 2_885_390u32;