Division

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

contract Yul {
    function divide(uint256 x, uint256 y) public pure returns (bytes32) {
        assembly {
            mstore(0x80, div(x, y))
            return(0x80, 0x20)
        }
    }
}

The div(a, b) Yul command takes in two numbers as arguments and returns their quotient, a / b.

To write a Yul divion code to check for zero divisions and prevent them, this will be the approach to use [6].

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

contract Yul {
    function divide(uint256 x, uint256 y) public pure returns (bytes32) {
        assembly {
            if eq(y, 0) {
                revert(0x00, 0x00)
            }
            
            if eq(x, 0) {
                return(0x80, 0x20)
            }

            let z := div(x, y)

            mstore(0x80, z)
            return(0x80, 0x20)
        }
    }
}