Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ukma!gatech!mcdchg!fbog!dbk
From: dbk@fbog.UUCP (Dave B. Kinzer @ Price Rd. GEG)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Adjusting the stack pointer
Summary: Instruction timing summary
Keywords: assembler A7 SP
Message-ID: <1690@fbog.UUCP>
Date: 27 Dec 88 19:50:15 GMT
References: <5047@garfield.MUN.EDU> <1667@fbog.UUCP> <5569@cbmvax.UUCP> <1688@fbog.UUCP> <1689@fbog.UUCP>
Reply-To: dbk@fbog.UUCP (Dave B. Kinzer @ Price Rd. GEG)
Distribution: na
Organization: Motorola Microcomputer Division, Tempe, Az.
Lines: 16

For a 68010, the instructions:
   addq.w  #d,An
   addq.l  #d,An
Have equivalent timings, as verified on a 68010 machine here at work, regardless
of what the manual says.

Incidentally, for displacements greater than 8 but less than 32768, a
better instruction is:
   lea.l  d(An),An

This instruction works faster than 'add.w #d,An'.


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