GNU Emacs 18.55 and AIX PS/2 1.1

[Luiz H de Figueiredo]

In article <MEISSNER.89Oct16114934 at twohot.rtp.dg.com> meissner at twohot.rtp.dg.com (Michael Meissner) writes:
>In article <2896 at netcom.UUCP> hue at 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 at aries5.uwaterloo.ca
Computer Systems Group			bitnet:   lhf at watcsg.bitnet
University of Waterloo
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eof