> I'm not sure it is the right place to ask these questions, are they are
> relative to the way GCC generate/use ASM code.
i am on vacation.. but.. what the hell :)
> If it is not, sorry for the inconvenience...
>
> 1) I would like to know which registers are assumed to be modified between
> function calls and which in fact did not need to be saved.
> By looking at the generated code, it seems than D0, D1 and D2 does not need
> to be saved if we use them in some inline ASM code.
dont make any assumptions :) it probably doesn't hurt to push em
all, and pop em all when you are done.. :) the optimizer may do some
fancy stuff :)
> 2) Is there any way to ask the compiler to use registers for passing
> arguments instead of using the stack ?
sure.. write the call yourself, put in some inline assembler,
pass pointers into registers, and do a jsr :) chances are tho,
your routine that you will call will probably need to be written in
ASM too - so your assumptions are set.
> 3) How may I force GCC to generate a mulu instruction, instead of muls ?
dunno.. either do it inline, or accept it :)
> 4) Is there any ressource, around, which explain the kind of informations I'm
> looking for ?
general gcc assembler info - heaps of it available, see Cube3D/Burning
for samples of inline assembly using gcc.. where possible, and i see
benefits.. i use it all the time
// az
[EMAIL PROTECTED]
http://www.ardiri.com/ <--- free games!
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