Comment by ericbarrett

My advice for the author and anybody else considering this is to break out the confirmed-correct assembler code into its own non-Go object and then link it in; otherwise, you're depending on the compiler to never change and inadvertently introduce branches. Since the functionality of the code wouldn't change it would be difficult to check with a unit test. (I guess you could add one that did the assembly step and then grepped for jump instructions, but that has problems of its own.)