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-rw-r--r--packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol9
1 files changed, 7 insertions, 2 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol
index 1c14dbcae..8a1444af1 100644
--- a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol
+++ b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol
@@ -74,7 +74,7 @@ contract LibMath is
return partialAmount;
}
- /// @dev Checks if rounding error > 0.1%.
+ /// @dev Checks if rounding error >= 0.1% when rounding down.
/// @param numerator Numerator.
/// @param denominator Denominator.
/// @param target Value to multiply with numerator/denominator.
@@ -121,7 +121,7 @@ contract LibMath is
return isError;
}
- /// @dev Checks if rounding error > 0.1%.
+ /// @dev Checks if rounding error >= 0.1% when rounding up.
/// @param numerator Numerator.
/// @param denominator Denominator.
/// @param target Value to multiply with numerator/denominator.
@@ -137,9 +137,14 @@ contract LibMath is
{
require(denominator > 0, "DIVISION_BY_ZERO");
+ // See the comments in `isRoundingError`.
if (target == 0 || numerator == 0) {
+ // When either is zero, the ideal value and rounded value are zero
+ // and there is no rounding error. (Although the relative error
+ // is undefined.)
return false;
}
+ // Compute remainder as before
uint256 remainder = mulmod(target, numerator, denominator);
// TODO: safeMod
remainder = safeSub(denominator, remainder) % denominator;