A86: Faster way (_ldhlind)?

To: assembly-86@lists.ticalc.org
Subject: A86: Faster way (_ldhlind)?
From: David Phillips <electrum@tfs.net>
Date: Fri, 07 Aug 1998 18:29:32 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


Does anyone know how the rom call _ldhlind work?  It effectively does this
operation:

ld hl,(hl)

This is useful when hl points to a pointer, and you want it to point to the
data pointed to by that pointer (I hope you understood that, because I
didn't).  What I came up with is below and worked out well because I needed
to de to have the old pointer anyway, but is there a better routine (that
doesn't destroy other regs)?

 ld d,(hl)	; 7T
 inc hl	; 6T
 ld e,(hl)	; 7T
 ex hl,de	; 4T
		;==== 24 t-states, HL = (HL), DE = HL + 1
		
Thanks,

--
David Phillips
mailto:electrum@tfs.net
ICQ: 13811951
AOL/AIM: electrum32

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Re: A86: Faster way (_ldhlind)?

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