[A83] Re: Conditional bcall()ing

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: Conditional bcall()ing
From: "Henk Poley" <HPoley@DDS.nl>
Date: Fri, 19 Oct 2001 08:15:14 +0200
Reply-To: assembly-83@lists.ticalc.org


> Van: Andrey Gorlin <ag_silver_83p@ameritech.net>
> 
> In MirageOS programming, is there a way to make a conditional bcall()?
> (Like "call z,<whatever>", only with bcall().)

I'm not sure if there isn't a 'normal' way to handle it, but you could do
things like:

bcall_z(xxx)
=
jr nz,$+3	; bcall() = 3 bytes
bcall(xxx)

So always take the opposite of the flag, and jump[-relative] over the
bcall(), a macro would be like this:

#define bcall_z(addr) jr nz,$+3 \ rst 28 \ .dw addr

	Henk Poley <><

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