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Fix difficulty adjustment. #3884

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Dec 17, 2016
+6 −6
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Fix difficulty adjustment. #3884

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12 changes: 6 additions & 6 deletions ethcore/src/ethereum/ethash.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -178,15 +178,15 @@ impl Engine for Ethash {
let gas_limit = {
let gas_limit = parent.gas_limit().clone();
let bound_divisor = self.ethash_params.gas_limit_bound_divisor;
let lower_limit = gas_limit - gas_limit / bound_divisor + 1.into();
let upper_limit = gas_limit + gas_limit / bound_divisor - 1.into();
if gas_limit < gas_floor_target {
min(gas_floor_target, gas_limit + gas_limit / bound_divisor - 1.into())
min(gas_floor_target, upper_limit)
} else if gas_limit > gas_ceil_target {
max(gas_ceil_target, gas_limit - gas_limit / bound_divisor + 1.into())
max(gas_ceil_target, lower_limit)
} else {
min(gas_ceil_target,
max(gas_floor_target,
gas_limit - gas_limit / bound_divisor + 1.into() +
(header.gas_used().clone() * 6.into() / 5.into()) / bound_divisor))
max(gas_floor_target, min(min(gas_ceil_target, upper_limit),
lower_limit + (header.gas_used().clone() * 6.into() / 5.into()) / bound_divisor))
}
};
header.set_difficulty(difficulty);
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