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Re: Gas can't handle prefix generated by gcc

From: Zack Weinberg <zack at codesourcery dot com>
To: "H. J. Lu" <hjl at lucon dot org>
Cc: gcc at gcc dot gnu dot org, Jan Beulich <JBeulich at novell dot com>, binutils at sources dot redhat dot com
Date: Fri, 23 Jul 2004 12:19:24 -0700
Subject: Re: Gas can't handle prefix generated by gcc
References: <s100c3d9.002@emea1-mh.id2.novell.com><20040723140035.GA31423@lucon.org> <87y8laboyn.fsf@codesourcery.com><20040723185839.GA4477@lucon.org>

"H. J. Lu" <hjl@lucon.org> writes:

> It seems that gcc uses a prefix syntax which gas doesn't handle. Does
> gcc always use " ; " as prefix separator?

Yes.  It does that for cs/ds on branch hints, it does that for "rep"
on string instructions, it does that for "lock" on atomic updates.

I imagine it's never been a problem before because the length of the
prefixed instruction has never been relevant before.

zw

Follow-Ups:
- Re: Gas can't handle prefix generated by gcc
  - From: Zack Weinberg

References:
- recent change to binutils' include/opcode/i386.h
  - From: Jan Beulich
- Re: recent change to binutils' include/opcode/i386.h
  - From: H. J. Lu
- Re: recent change to binutils' include/opcode/i386.h
  - From: Zack Weinberg
- Gas can't handle prefix generated by gcc
  - From: H. J. Lu

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