Re: Is "register" generally ignored?

fjh@cs.mu.OZ.AU (Fergus Henderson)
9 Mar 2002 02:52:48 -0500

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Is "register" generally ignored? smeyers@aristeia.com (Scott Meyers) (2002-02-28)
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From: fjh@cs.mu.OZ.AU (Fergus Henderson)
Newsgroups: comp.compilers
Date: 9 Mar 2002 02:52:48 -0500
Organization: Computer Science, University of Melbourne
References: 02-02-067
Keywords: C, C++, optimize
Posted-Date: 09 Mar 2002 02:52:48 EST



Scott Meyers <smeyers@aristeia.com> writes:


>Is it reasonable to assume that contemporary C and C++
>compilers will ignore use of "register" when generating optimized code?


Yes.


>[I hope that compilers at least remember that register variables don't
>have addresses, so there's no aliasing problems. -John]


Compilers can easily determine which variables have not had their address
taken, even if those variables were not explicitly declared `register'.
Modern optimizing C and C++ compilers should certainly be expected to
do this.


--
Fergus Henderson <fjh@cs.mu.oz.au> | "I have always known that the pursuit
The University of Melbourne | of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh> | -- the last words of T. S. Garp.

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