Provided is a non-transitory computer-readable recording medium storing a function generation program that causes a computer to execute a process, the process including referring to a storage unit that stores instruction information about an instruction to generate a first function that corresponds to the instruction and receives one or more arguments representing one or more operands of the instruction, generating first code inside the first function, where the first code calls a second function that returns machine language representing a process executed by the instruction for the one or more operands represented by the one or more arguments, and generating second code inside the first function, where the second code writes the machine language in a memory.