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Extract coeff computation in curve function #59

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Extract coeff computation in curve function #59

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c123cfd
chore: space
MathisGD Nov 4, 2023
94753ff
refactor: extract coeff computation
MerlinEgalite Nov 6, 2023
3eb9580
docs: move comment to the right place
MerlinEgalite Nov 6, 2023
f3eaa08
refactor: rename variable
MerlinEgalite Nov 9, 2023
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9 changes: 4 additions & 5 deletions src/SpeedJumpIrm.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,7 @@ contract AdaptativeCurveIrm is IIrm {
// <=> endBorrowRate <= startBorrowRate.
avgBorrowRate = uint256((int256(endBorrowRate) - int256(startBorrowRate)).wDivDown(linearVariation));
}

return (avgBorrowRate, endRateAtTarget);
}
}
Expand All @@ -163,11 +164,9 @@ contract AdaptativeCurveIrm is IIrm {
/// r = ((1-1/C)*err + 1) * rateAtTarget if err < 0
/// ((C-1)*err + 1) * rateAtTarget else.
function _curve(uint256 _rateAtTarget, int256 err) private view returns (uint256) {
uint256 coeff = err < 0 ? WAD - WAD.wDivDown(CURVE_STEEPNESS) : CURVE_STEEPNESS - WAD;

// Safe "unchecked" cast because err >= -1 (in WAD).
if (err < 0) {
return uint256((WAD - WAD.wDivDown(CURVE_STEEPNESS)).wMulDown(err) + WAD_INT).wMulDown(_rateAtTarget);
} else {
return uint256((CURVE_STEEPNESS - WAD).wMulDown(err) + WAD_INT).wMulDown(_rateAtTarget);
}
return uint256(coeff.wMulDown(err) + WAD_INT).wMulDown(_rateAtTarget);
}
}