Hello Stijn,
Unfortunately this is not possible with SDCC.
Greets,
Maarten
> Hi all,
>
> I have a question regarding inline assembly in sdcc:
>
> I have some assembly code which I would like to put in a macro that is to
> be called many times throughout my C-code. For efficiency reasons this
> short piece of assembly must be inlined hence I can't use a function. Also
> this macro must take an argument and herein lies the problem. My assembly
> code must know which register contains this input value, i.e. I need a way
> to "connect" my C variables to my assembly registers.
>
> I need something like:
>
> // placeholder == '%r', to be substituted by whatever register the
> compiler allocates for 'val'
> #define MY_MACRO (val) __asm__("mov a,%r", val)
>
> Is something like this possible?
>
> Even better would be if the compiler could also substitute a placeholder
> by a free register that is unused by the surrounding function for more
> complicated computations:
>
> // placeholder == '%ur', register to be reserved and substituted
> #define MY_MACRO (val) __asm__(
> "mov %ur,a\n",
> "dec %ur\n",
> "mov a,%ur\n"
> )
>
> Thanks,
>
> Stijn
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