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Merged
thedavidmeister merged 2 commits into from
Jan 19, 2026
Merged

snapshot #8

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df9ae25
snapshot
thedavidmeister Jan 19, 2026
6f09bf4
tests
thedavidmeister Jan 19, 2026
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9 changes: 6 additions & 3 deletions .gas-snapshot
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Original file line number Diff line number Diff line change
@@ -1,3 +1,6 @@
LibCtPopTest:testCTPOPReference(uint256) (runs: 2048, μ: 3604, ~: 3605)
LibCtPopTest:testCTPOPShuffled(uint8,bytes32) (runs: 2048, μ: 149131, ~: 149131)
LibCtPopTest:testCTPOPUnshuffled(uint8) (runs: 2048, μ: 4146, ~: 4146)
LibCtPopTest:testCtPop0() (gas: 741)
LibCtPopTest:testCtPop1() (gas: 764)
LibCtPopTest:testCtPop256EdgeCase() (gas: 677)
LibCtPopTest:testCtPopReference(uint256) (runs: 2048, μ: 789, ~: 790)
LibCtPopTest:testCtPopShuffled(uint8,bytes32) (runs: 2048, μ: 144902, ~: 144902)
LibCtPopTest:testCtPopUnshuffled(uint8) (runs: 2048, μ: 989, ~: 989)
31 changes: 27 additions & 4 deletions test/src/lib/LibCtPop.ctpop.t.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@
pragma solidity =0.8.25;

import {Test} from "forge-std/Test.sol";

import {LibCtPop} from "src/lib/LibCtPop.sol";

/// @title LibCtPopTest
Expand All @@ -13,7 +12,7 @@ import {LibCtPop} from "src/lib/LibCtPop.sol";
contract LibCtPopTest is Test {
/// We should be able to count the number of bits set when we simply set a
/// sequence of bits from the low bit to some mid bit.
function testCTPOPUnshuffled(uint8 n) external pure {
function testCtPopUnshuffled(uint8 n) external pure {
uint256 x = (1 << n) - 1;
uint256 ct = LibCtPop.ctpop(x);
assertEq(n, ct);
Expand All @@ -22,7 +21,7 @@ contract LibCtPopTest is Test {
}

/// The distribution of bits in the underlying `uint256` should not matter.
function testCTPOPShuffled(uint8 n, bytes32 rand) external pure {
function testCtPopShuffled(uint8 n, bytes32 rand) external pure {
uint256 x = (1 << n) - 1;
uint256 y = 0;

Expand All @@ -44,8 +43,32 @@ contract LibCtPopTest is Test {
assertEq(ct, ctSlow);
}

function testCTPOPReference(uint256 x) external pure {
function testCtPopReference(uint256 x) external pure {
uint256 ct = LibCtPop.ctpop(x);
uint256 ctSlow = LibCtPop.ctpopSlow(x);
assertEq(ct, ctSlow);
}

function testCtPop256EdgeCase() external pure {
uint256 x = type(uint256).max;
uint256 ct = LibCtPop.ctpop(x);
assertEq(256, ct);
uint256 ctSlow = LibCtPop.ctpopSlow(x);
assertEq(ct, ctSlow);
}

function testCtPop0() external pure {
uint256 x = 0;
uint256 ct = LibCtPop.ctpop(x);
assertEq(0, ct);
uint256 ctSlow = LibCtPop.ctpopSlow(x);
assertEq(ct, ctSlow);
}

function testCtPop1() external pure {
uint256 x = 1;
uint256 ct = LibCtPop.ctpop(x);
assertEq(1, ct);
uint256 ctSlow = LibCtPop.ctpopSlow(x);
assertEq(ct, ctSlow);
}
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