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  • What are the advantages if caller is responsible for argument . . .
    Having the caller take care of the clean-up, rather than the callee, has the advantage of making more callees frugal, and thus eligible for Red Zone optimization Whether this was foreseen or not, I know not Summary so far Up until C++11, it is therefore "logical" for the caller to be the one cleaning up arguments passed by value
  • calling conventions - Are modern compilers passing parameters in . . .
    Stack cleanup in stdcall (callee-pops) for variable arguments for discussion of some of the difficulty of callee-pops for variadic on x86 But yes, some systems have used totally different ways to pass args, like dynamically allocating space for an "activation record" (I think IBM did that, maybe on their mainframes, instead of having a stack
  • How does link-time function inlining work?
    For example, having full RDA info and use def chains can enable dead code elimination for a particular inlining instance (and thus turn callee into something similar to a macro) Without such context, by thinking wishfully, I suspect that linker can only dump callee instructions and eliminate jump call instruction, thus eliminating the
  • functions - Which calling convention should my compiler use . . .
    To support tail call optimization in situations where the callee has more arguments than the caller a ‘callee pops arguments’ convention is used This currently causes each fastcc call that is not tail call optimized (because one or more of above constraints are not met) to be followed by a readjustment of the stack So performance might be
  • functions - Return statements vs passing a pointer - Programming . . .
    There's an interesting side argument here whether it's better to pass a null pointer in when a particular side output is not required -- this allows the callee to skip computation of the value, which might be a performance benefit; but also requires conditional logic, which might be a performance loss





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