Xref: utzoo comp.unix.aix:155 gnu.emacs.bug:1247
Path: utzoo!attcan!utgpu!watmath!maytag!aries5!lhf
From: lhf@aries5.uucp (Luiz H de Figueiredo)
Newsgroups: comp.unix.aix,gnu.emacs.bug
Subject: Re: GNU Emacs 18.55 and AIX PS/2 1.1
Message-ID: <641@maytag.waterloo.edu>
Date: 17 Oct 89 16:02:46 GMT
References: <347@synsys.UUCP> <34525@srcsip.UUCP> <2896@netcom.UUCP> <MEISSNER.89Oct16114934@twohot.rtp.dg.com>
Sender: daemon@maytag.waterloo.edu
Reply-To: lhf@aries5.UUCP (Luiz H de Figueiredo)
Distribution: na
Organization: Computer Systems Group, University of Waterloo
Lines: 21

In article <MEISSNER.89Oct16114934@twohot.rtp.dg.com> meissner@twohot.rtp.dg.com (Michael Meissner) writes:
>In article <2896@netcom.UUCP> hue@netcom.UUCP (Jonathan Hue) writes:
>
>A usually more efficent way of sign extending characters (depending
>on how much branches cost in terms of hardware speed or compiler
>optimizations) is:
>
>#define SIGN_EXTEND_CHAR(a) ((((a) & 0xFF) ^ 0x80) -  0x80)

Why not use 

#define SIGN_EXTEND_CHAR(a) ( (int) (signed char) (a) )

I am missing something?

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Luiz Henrique de Figueiredo		internet: lhf@aries5.uwaterloo.ca
Computer Systems Group			bitnet:   lhf@watcsg.bitnet
University of Waterloo
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