Or, to see what's really going on at a low level you have immediate access to the native assembly from the REPL: julia> square(x) = x^2 square (generi

Or, to see what's really going on at a low level you have immediate access to the native assembly from the REPL: julia> square(x) = x^2 square (generic function with 1 method) julia> @code_native square(1) .text Filename: REPL[3] pushq %rbp movq %rsp, %rbp Source line: 1 imulq %rdi, %rdi movq %rdi, %rax popq %rbp retq julia> @code_native square(1.0) .text Filename: REPL[3] pushq %rbp movq %rsp, %rbp Source line: 1 mulsd %xmm0, %xmm0 popq %rbp retq