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From: duggie@Jessica.stanford.edu (Doug Felt)
Newsgroups: comp.sys.m68k
Subject: Re: addq.w #n,sp and a pop quiz
Keywords: C asm addq cmpa
Message-ID: <4350@Portia.Stanford.EDU>
Date: 12 Dec 88 17:38:56 GMT
References: <5005@bsu-cs.UUCP> <5460@cbmvax.UUCP> <1100@ncar.ucar.edu> <670@auspex.UUCP> <1737@oakhill.UUCP>
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Reply-To: duggie@Jessica.stanford.edu (Doug Felt)
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In article <1737@oakhill.UUCP> davet@oakhill.UUCP (David Trissel) writes:
>
> [stuff deleted]
>
>There is only one place in the instruction set where a data register is
>implicitly sign-extended. Where?
>

I believe this instruction is CMPA <ea>,An where a word-length value
in the effective address field (possibly a data register) is
sign-extended before being compared with the address register.

>
>  -- Dave Trissel  Motorola Semiconductor, Austin Texas

Doug Felt
Courseware Authoring Tools Project
Sweet Hall 3rd Floor
Stanford University
duggie@jessica.stanford.edu