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bitwise optimizations #120

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merged 4 commits into from
Nov 10, 2022
+44 −45
Merged

bitwise optimizations #120

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6440231
bitwise optimizations
snreynolds Nov 9, 2022
d865412
gas
snreynolds Nov 9, 2022
d63e7f4
remove repeat nonce test
snreynolds Nov 10, 2022
074337f
merge main
snreynolds Nov 10, 2022
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2 changes: 1 addition & 1 deletion .forge-snapshots/permitBatchTransferFromMultipleTokens.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/permitBatchTransferFromSingleToken.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/permitTransferFromBatchTypedWitness.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/permitTransferFromCompactSig.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/permitTransferFromSingleToken.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/permitTransferFromTypedWitness.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/single recipient 2 tokens.snap
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2 changes: 1 addition & 1 deletion .forge-snapshots/single recipient many tokens.snap
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64 changes: 32 additions & 32 deletions .gas-snapshot
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Expand Up @@ -28,13 +28,13 @@ CompactSignature:testCompactSignature27() (gas: 253)
CompactSignature:testCompactSignature28() (gas: 141)
EIP712Test:testDomainSeparator() (gas: 5759)
EIP712Test:testDomainSeparatorAfterFork() (gas: 10652)
NonceBitmapTest:testHighNonces() (gas: 36088)
NonceBitmapTest:testInvalidateFullWord() (gas: 62606)
NonceBitmapTest:testInvalidateNonzeroWord() (gas: 85721)
NonceBitmapTest:testLowNonces() (gas: 41019)
NonceBitmapTest:testNonceWordBoundary() (gas: 57948)
NonceBitmapTest:testUseTwoRandomNonces(uint256,uint256) (runs: 256, μ: 49304, ~: 51829)
NonceBitmapTest:testUsingNonceTwiceFails(uint256) (runs: 256, μ: 32616, ~: 32616)
NonceBitmapTest:testHighNonces() (gas: 35958)
NonceBitmapTest:testInvalidateFullWord() (gas: 62805)
NonceBitmapTest:testInvalidateNonzeroWord() (gas: 85285)
NonceBitmapTest:testLowNonces() (gas: 40671)
NonceBitmapTest:testNonceWordBoundary() (gas: 42042)
NonceBitmapTest:testUseTwoRandomNonces(uint256,uint256) (runs: 256, μ: 48832, ~: 51523)
NonceBitmapTest:testUsingNonceTwiceFails(uint256) (runs: 256, μ: 21775, ~: 21798)
Permit2LibTest:testOZSafePermit() (gas: 24311)
Permit2LibTest:testOZSafePermitPlusOZSafeTransferFrom() (gas: 129066)
Permit2LibTest:testOZSafeTransferFrom() (gas: 38787)
Expand All @@ -50,29 +50,29 @@ Permit2LibTest:testTransferFrom2() (gas: 38404)
Permit2LibTest:testTransferFrom2Full() (gas: 53437)
Permit2LibTest:testTransferFrom2InvalidAmount() (gas: 12519)
Permit2LibTest:testTransferFrom2NonPermitToken() (gas: 53305)
SignatureTransferTest:testGasMultiplePermitBatchTransferFrom() (gas: 271182)
SignatureTransferTest:testGasSinglePermitBatchTransferFrom() (gas: 186398)
SignatureTransferTest:testGasSinglePermitTransferFrom() (gas: 124117)
SignatureTransferTest:testInvalidateUnorderedNonces() (gas: 56562)
SignatureTransferTest:testPermitBatchMultiPermitSingleTransfer() (gas: 133761)
SignatureTransferTest:testPermitBatchTransferFrom() (gas: 162210)
SignatureTransferTest:testPermitBatchTransferFromSingleRecipient() (gas: 190511)
SignatureTransferTest:testPermitBatchTransferFromTypedWitness() (gas: 242649)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidType() (gas: 87340)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidTypeHash() (gas: 86825)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidTypeName() (gas: 88298)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidWitness() (gas: 88343)
SignatureTransferTest:testGasMultiplePermitBatchTransferFrom() (gas: 271029)
SignatureTransferTest:testGasSinglePermitBatchTransferFrom() (gas: 186245)
SignatureTransferTest:testGasSinglePermitTransferFrom() (gas: 123964)
SignatureTransferTest:testInvalidateUnorderedNonces() (gas: 41108)
SignatureTransferTest:testPermitBatchMultiPermitSingleTransfer() (gas: 133608)
SignatureTransferTest:testPermitBatchTransferFrom() (gas: 162057)
SignatureTransferTest:testPermitBatchTransferFromSingleRecipient() (gas: 190358)
SignatureTransferTest:testPermitBatchTransferFromTypedWitness() (gas: 242496)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidType() (gas: 87187)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidTypeHash() (gas: 86672)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidTypeName() (gas: 88145)
SignatureTransferTest:testPermitBatchTransferFromTypedWitnessInvalidWitness() (gas: 88190)
SignatureTransferTest:testPermitBatchTransferInvalidAmountsLengthMismatch() (gas: 43760)
SignatureTransferTest:testPermitBatchTransferMultiAddr() (gas: 160606)
SignatureTransferTest:testPermitBatchTransferSingleRecipientManyTokens() (gas: 212666)
SignatureTransferTest:testPermitTransferFrom() (gas: 93208)
SignatureTransferTest:testPermitTransferFromCompactSig() (gas: 124181)
SignatureTransferTest:testPermitTransferFromIncorrectSigLength() (gas: 51430)
SignatureTransferTest:testPermitTransferFromInvalidNonce() (gas: 93237)
SignatureTransferTest:testPermitTransferFromRandomNonceAndAmount(uint256,uint128) (runs: 256, μ: 95864, ~: 96840)
SignatureTransferTest:testPermitTransferFromToSpender() (gas: 93516)
SignatureTransferTest:testPermitTransferFromTypedWitness() (gas: 127964)
SignatureTransferTest:testPermitTransferFromTypedWitnessInvalidType() (gas: 58690)
SignatureTransferTest:testPermitTransferFromTypedWitnessInvalidTypeName() (gas: 59744)
SignatureTransferTest:testPermitTransferFromTypedWitnessInvalidTypehash() (gas: 57680)
SignatureTransferTest:testPermitTransferSpendLessThanFull(uint256,uint128) (runs: 256, μ: 98199, ~: 99917)
SignatureTransferTest:testPermitBatchTransferMultiAddr() (gas: 160453)
SignatureTransferTest:testPermitBatchTransferSingleRecipientManyTokens() (gas: 212513)
SignatureTransferTest:testPermitTransferFrom() (gas: 93055)
SignatureTransferTest:testPermitTransferFromCompactSig() (gas: 124028)
SignatureTransferTest:testPermitTransferFromIncorrectSigLength() (gas: 51277)
SignatureTransferTest:testPermitTransferFromInvalidNonce() (gas: 73272)
SignatureTransferTest:testPermitTransferFromRandomNonceAndAmount(uint256,uint128) (runs: 256, μ: 95711, ~: 96687)
SignatureTransferTest:testPermitTransferFromToSpender() (gas: 93363)
SignatureTransferTest:testPermitTransferFromTypedWitness() (gas: 127811)
SignatureTransferTest:testPermitTransferFromTypedWitnessInvalidType() (gas: 58537)
SignatureTransferTest:testPermitTransferFromTypedWitnessInvalidTypeName() (gas: 59591)
SignatureTransferTest:testPermitTransferFromTypedWitnessInvalidTypehash() (gas: 57527)
SignatureTransferTest:testPermitTransferSpendLessThanFull(uint256,uint128) (runs: 256, μ: 98046, ~: 99764)
9 changes: 4 additions & 5 deletions src/SignatureTransfer.sol
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Expand Up @@ -146,18 +146,17 @@ contract SignatureTransfer is ISignatureTransfer, EIP712 {
/// @dev The last 8 bits of the nonce value is the position of the bit in the bitmap
function bitmapPositions(uint256 nonce) private pure returns (uint256 wordPos, uint256 bitPos) {
wordPos = uint248(nonce >> 8);
bitPos = uint8(nonce & 255);
bitPos = uint8(nonce);
}

/// @notice Checks whether a nonce is taken and sets the bit at the bit position in the bitmap at the word position
/// @param from The address to use the nonce at
/// @param nonce The nonce to spend
function _useUnorderedNonce(address from, uint256 nonce) internal {
(uint256 wordPos, uint256 bitPos) = bitmapPositions(nonce);
uint256 bitmap = nonceBitmap[from][wordPos];
uint256 bit = 1 << bitPos;
uint256 flipped = nonceBitmap[from][wordPos] ^= bit;
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woah this is so smart. love it

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@PaulRBerg PaulRBerg May 23, 2023 •
edited
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Smart, yes, but this approach runs counter to the Checks-Effects-Interactions pattern by switching the order of the checks and the effects.

It's also not super intuitive what the order of operations is - I opened an issue about this: #217


if ((bitmap >> bitPos) & 1 == 1) revert InvalidNonce();

nonceBitmap[from][wordPos] = bitmap | (1 << bitPos);
if (flipped & bit == 0) revert InvalidNonce();
}
}