Post #2168699

So I have a question about #C and I guess indirectly about #clang since clang is the compiler that has both musttail and the preserve_none attribute / calling convention that are used together for the purpose I'm looking at; the thing I'm trying to do is translate #MoarVM's interpreter loop from a compile-time switchable "loop with a switch in it" and "function with computed GOTO inside it" to also have a variant where each little opcode implementation becomes its own function, they all have the same call signature, and going from one to another uses a return goto (that's probably what a future C standard will call it; for now you can get it with [[clang::musttail]]). I've already got it working apparently, but performance isn't stellar. I think that's because the variables I'm passing around are four pointers to pointers. I do this because until now the interpreter loop frame had local variables that were used by all ops and the addresses of these variables were also stored for functions to change