Re: x86-64 and calling conventions

On May 13, 4:10 am, Dave Parker <davepar...@flamingthunder.com> wrote:
> Left-to-right means the arguments are evaluated in
> the order that users expect them to be. If the function is vararg,
> then I push the argument count on the stack last.


The evaluation order and the calling convention don't need to be tied
together, though. Gcc on i386 for example subtracts the required
number of words from %esp and then copy the arguments into place via
indexed indirect mov's. No idea if that is slower or faster than
push'ing stuff onto the stack instead, but the version of gcc I've
used "gcc -S" on will use the mov approach even if all arguments are
constants.


Vidar

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