Date: Thu, 08 Oct 1998 10:57:21 -0600 From: Wes Peters <wes@softweyr.com> To: chad@dcfinc.com Cc: marko@cs.uni-frankfurt.de, freebsd-stable@FreeBSD.ORG Subject: Re: Global register variables in gcc and stdio.h?!? Message-ID: <361CEEF1.3A3182D@softweyr.com> References: <199810071842.LAA24550@freebie.dcfinc.com>
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Chad R. Larson wrote:
>
> > An application I want to compile runs much faster if it can use global
> > register variables.
> [ snip ]
> > Please comment.
>
> One comment I'd have is that GCC does a pretty wonderful job of allocating
> registers on its own. Perhaps your experience is based on some other
> compiler?
I think you'll find in GCC that "register" is regarded as a weak hint at
best. On x86 I think it's basically a no-op. The compiler is a whole
lot smarter about register allocation that you are, especially on an
architecture where there aren't any.
--
Where am I, and what am I doing in this handbasket?
Wes Peters +1.801.915.2061
Softweyr LLC wes@softweyr.com
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