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test: pin fromFixedDecimalLosslessPacked(x, 0) bitwise identity (I06) #215

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Merged
thedavidmeister merged 1 commit into from
May 14, 2026
Merged

test: pin fromFixedDecimalLosslessPacked(x, 0) bitwise identity (I06) #215

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12 changes: 12 additions & 0 deletions test/src/lib/LibDecimalFloat.decimalLossless.t.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,18 @@ contract LibDecimalFloatDecimalLosslessTest is Test {
return float.toFixedDecimalLossless(decimals);
}

/// `fromFixedDecimalLosslessPacked(value, 0)` is the bitwise identity
/// `bytes32(value)` for every `value` that fits in `int224`. Pinned
/// here so the float library owns the invariant — callers (e.g. the
/// Rainlang EVM opcodes for `block.number`, `block.timestamp`,
/// `chainid`) can write the raw integer to the stack as a documented
/// optimization without re-discovering or re-asserting it.
function testFromFixedDecimalLosslessPackedZeroDecimalsIsIdentity(uint256 value) external pure {
value = bound(value, 0, uint256(int256(type(int224).max)));
Float result = LibDecimalFloat.fromFixedDecimalLosslessPacked(value, 0);
assertEq(Float.unwrap(result), bytes32(value));
}

function testFromFixedDecimalLosslessMem(uint256 value, uint8 decimals) external {
value = bound(value, 0, uint256(int256(type(int224).max)));
(,, bool losslessPreflight) = LibDecimalFloat.fromFixedDecimalLossy(value, decimals);
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