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| author | Greg Hysen <greg.hysen@gmail.com> | 2018-04-14 06:17:56 +0800 |
|---|---|---|
| committer | Amir Bandeali <abandeali1@gmail.com> | 2018-04-21 04:56:18 +0800 |
| commit | 80d06d358a171daf7a260656c33d08fac1868382 (patch) | |
| tree | cc3968444137d0b2784b8bd5edd41fa502db7084 | |
| parent | 1cace49b744f216f0558880a80675463737f6a12 (diff) | |
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Unrolled the loop that copies the Order struct in FillOrderNoThrow. Saves 900 gas
| -rw-r--r-- | packages/contracts/src/contracts/current/protocol/Exchange/MixinWrapperFunctions.sol | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/packages/contracts/src/contracts/current/protocol/Exchange/MixinWrapperFunctions.sol b/packages/contracts/src/contracts/current/protocol/Exchange/MixinWrapperFunctions.sol index 24bf78322..8ac9977bd 100644 --- a/packages/contracts/src/contracts/current/protocol/Exchange/MixinWrapperFunctions.sol +++ b/packages/contracts/src/contracts/current/protocol/Exchange/MixinWrapperFunctions.sol @@ -145,11 +145,23 @@ contract MixinWrapperFunctions is paramsAreaOffset := add(paramsAreaOffset, 0x20) // Write values for each field in the order - for{let i := 0} lt(i, 13) {i := add(i, 1)} { - mstore(dataAreaEnd, mload(sourceOffset)) - dataAreaEnd := add(dataAreaEnd, 0x20) - sourceOffset := add(sourceOffset, 0x20) - } + // It would be nice to use a loop, but we save on gas by writing + // the stores sequentially. + mstore(dataAreaEnd, mload(sourceOffset)) // makerAddress + mstore(add(dataAreaEnd, 0x20), mload(add(sourceOffset, 0x20))) // takerAddress + mstore(add(dataAreaEnd, 0x40), mload(add(sourceOffset, 0x40))) // makerTokenAddress + mstore(add(dataAreaEnd, 0x60), mload(add(sourceOffset, 0x60))) // takerTokenAddress + mstore(add(dataAreaEnd, 0x80), mload(add(sourceOffset, 0x80))) // feeRecipientAddress + mstore(add(dataAreaEnd, 0xA0), mload(add(sourceOffset, 0xA0))) // makerTokenAmount + mstore(add(dataAreaEnd, 0xC0), mload(add(sourceOffset, 0xC0))) // takerTokenAmount + mstore(add(dataAreaEnd, 0xE0), mload(add(sourceOffset, 0xE0))) // makerFeeAmount + mstore(add(dataAreaEnd, 0x100), mload(add(sourceOffset, 0x100))) // takerFeeAmount + mstore(add(dataAreaEnd, 0x120), mload(add(sourceOffset, 0x120))) // expirationTimeSeconds + mstore(add(dataAreaEnd, 0x140), mload(add(sourceOffset, 0x140))) // salt + mstore(add(dataAreaEnd, 0x160), mload(add(sourceOffset, 0x160))) // Offset to makerAssetProxyMetadata + mstore(add(dataAreaEnd, 0x180), mload(add(sourceOffset, 0x180))) // Offset to takerAssetProxyMetadata + dataAreaEnd := add(dataAreaEnd, 0x1A0) + sourceOffset := add(sourceOffset, 0x1A0) // Write offset to <order.makerAssetProxyMetadata> mstore(add(dataAreaStart, mul(11, 0x20)), sub(dataAreaEnd, dataAreaStart)) |