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Regression testing and readability additions for reward curve log2 (#5610)

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Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>
This commit is contained in:
Hoani Bryson
2020-04-24 01:43:28 +12:00
committed by GitHub
parent 67200c1f5b
commit aabbf52909
2 changed files with 85 additions and 24 deletions
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substrate/frame/staking/reward-curve/src/lib.rs
+4
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@@ -268,10 +268,14 @@ impl INPoS {
}
}
// calculates x from:
// y = i_0 + (i_ideal * x_ideal - i_0) * 2^((x_ideal - x)/d)
// See web3 docs for the details
fn compute_opposite_after_x_ideal(&self, y: u32) -> u32 {
if y == self.i_0 {
return u32::max_value();
}
// Note: the log term calculated here represents a per_million value
let log = log2(self.i_ideal_times_x_ideal - self.i_0, y - self.i_0);
let term: u32 = ((self.d as u64 * log as u64) / 1_000_000).try_into().unwrap();