sub and function, asm and ix - Printable Version

sub and function, asm and ix - Printable Version

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sub and function, asm and ix - nitrofurano - 06-10-2013

when advancing a bit more on the MSX part of Boriel's ZX-Basic Compiler, and after that help from accessing paged memory on ZX-Spectrum 128k, i got this situation:

the library i used on the MSX "version"

Code:
sub msxvpoke(tad as uinteger,tva as uinteger)

  asm

    ld h,(ix+5)

    ld l,(ix+4)

    ld a,(ix+6)

    call $004D

    end asm

  end sub

there i'm seeing that sub is using 'ix' from the arguments, but i don't know how are they arranged (as ubyte, uinteger, etc.), and why or what for we use fastcall, get ix instead of bc,de,hl,af - and from a function, in which register or index the value is returned (af, just like from fastcall?)

i can't find documentation explaining it better on the wiki: <a class="postlink" href="http://www.boriel.com/wiki/en/index.php/ZX_BASIC:FUNCTION">http://www.boriel.com/wiki/en/index.php ... C:FUNCTION</a> and <a class="postlink" href="http://www.boriel.com/wiki/en/index.php/ZX_BASIC:SUB">http://www.boriel.com/wiki/en/index.php/ZX_BASIC:SUB</a>

thanks and cheers! Smile