The IR-based codegen allocated more memory for the struct.

[Subway2023]

Description

The IR-based codegen allocated more memory for the struct. After optimization, the IR-based codegen should allocate less memory？

Environment

• Compiler version: 0.8.26
• Target EVM version (as per compiler settings): Geth
• Framework/IDE (e.g. Truffle or Remix):
• EVM execution environment / backend / blockchain client:
• Operating system: Linux

Steps to Reproduce

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract BugTest {
    struct Complex {
        uint256 x;
        bytes32 y;
        address z;
    }
    function testBug() public  {
        Complex memory a = Complex({
            x: 123456,
            y: keccak256(abi.encodePacked("test")),
            z: address(0x1234567890123456789012345678901234567890)
        });
        bytes memory encoded = abi.encode(a);
        assembly {
            let p := mload(0x40)
            sstore(p, 1)
        }
    }
}

Legacy Codegen

storage:

{'388': '1'}

IR-based Codegen

storage:

{'416': '1'}

The IR-based codegen's free memory pointer is positioned further back.