Article View: comp.sys.mac
Article #24472Re: Code Optimization
From: David Goldsmith
Date: Thu, 28 Jan 1988 17:33
Date: Thu, 28 Jan 1988 17:33
16 lines
1181 bytes
1181 bytes
In article <10000@ccicpg.UUCP> nick@ccicpg.UUCP (Nick Crossley) writes:
>Another significant difference is that the 68020 has several additional
>addressing modes, so that double indirection (ie for handles) and scaled
>indexing for arrays, amongst other things, can be done in one instruction.
Actually, it turns out it's both smaller and faster to dereference a handle
with two separate instructions, just like on the 68000. The single 68020
instruction is larger and slower than the two separate 68000 instructions.
--
David Goldsmith
Apple Computer, Inc.
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<7281@apple.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!rutgers!sri-spam!ames!sdcsvax!ucsdhub!hp-sdd!hplabs!pyramid!voder!apple!dgoldReferences:
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!rutgers!sri-spam!ames!sdcsvax!ucsdhub!hp-sdd!hplabs!pyramid!voder!apple!dgold From: dgold@apple.UUCP (David Goldsmith) Newsgroups: comp.sys.mac Subject: Re: Code Optimization Message-ID: <7281@apple.UUCP> Date: 28 Jan 88 17:33:38 GMT References: <6252@cc5.bbn.COM> <10000@ccicpg.UUCP> Reply-To: dgold@apple.UUCP (David Goldsmith) Organization: Apple Computer Inc., Cupertino, USA Lines: 16 Keywords: mac,68000,68020