[A83] Re: Conditional bcall()ing
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[A83] Re: Conditional bcall()ing
----------------------------------------------
Original Message
From: "Dan Weiss"<dwedit@hotmail.com>
Subject: [A83] Re: Conditional bcall()ing
Date: Mon, 29 Oct 2001 18:18:43 -0600
>
>>From: "Joe Pemberton" <dArkSk8eR@buffbody.com>
>>Reply-To: assembly-83@lists.ticalc.org
>>To: assembly-83@lists.ticalc.org
>>Subject: [A83] Re: Conditional bcall()ing
>>Date: Mon, 29 Oct 2001 18:00:27 -0600
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>>----------------------------------------------
>>Original Message
>>From: "Tijl Coosemans"<tijl.coosemans@mail.be>
>>Subject: [A83] Re: Conditional bcall()ing
>>Date: Mon, 29 Oct 2001 21:45:34 +0100
>>
>> >
>> >> From: Tijl Coosemans <tijl.coosemans@mail.be>
>> >>
>> >> > From: Emir Sakic <saka@hotmail.com>
>> >> >
>> >> > Right, my fault about lables.
>> >> > jr 3 gave me error with $9327 as start address, thanx for clearing
>>it.
>> >> >
>> >> > Anyway to conclude:
>> >> > #define bcall_z(addr) jr nz,$+5 \ rst 28h \ .dw addr
>> >> > :)
>> >
>> >> indeed, as taken from the Ion.inc file
>> >>
>> >> #define bcall(xxxx) rst 28h \ .dw xxxx
>> >> #define bcallz(xxxx) jr nz,$+5 \ rst 28h \ .dw xxxx
>> >> #define bcallnz(xxxx) jr z,$+5 \ rst 28h \ .dw xxxx
>> >> #define bcallc(xxxx) jr nc,$+5 \ rst 28h \ .dw xxxx
>> >> #define bcallnc(xxxx) jr c,$+5 \ rst 28h \ .dw xxxx
>> >>
>> >> I think somebody has already sent this, but since I didn't
remember...
>>:)
>> >
>> >BTW: Even though it's a byte bigger, a 'jp' would be faster than a 'jr'.
>>(Not that the gain in speed
>> >is very large compared to a 'bcall'.)
>>
>>Yes, but the problem with that is that if you use a jp instead of a jr the
>>jump would NOT be relative, and you could NOT use the #define statement to
>>make the whole bcall_z(xxxx) thing. Why? Simple - you would need a label
>>right after the bcall to jump to if nonzero is set. And if you used the
>>"#define jp nz, label \ rst 28h \ .dw xxxx", you would always jump to
>>"label" =p not good. You <i>could</i> just not use #define and write in
>> jp nz, label
>> bcall(xxxx)
>> label
>>each time you want to do bcallz(xxxx), but that would defeat the point of
>>the whole #define thing =)
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>> >
>> >
>>
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>
>The $ feature of TASM can work for any 16-bit value, so it would work fine
>with jp. (you just need to add an extra byte to the offset)
>
>TASM converts the absolute address of a JR to a reletive address, so
that's
>why $ works there.
oh, I thought the $ just lets TASM know that the value is a hex value =)
thanks for telling me that
>
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