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Re: sort --random-sort

From: Andreas Schwab
Subject: Re: sort --random-sort
Date: Thu, 01 Dec 2005 11:24:01 +0100
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/22.0.50 (gnu/linux)

Frederik Eaton <address@hidden> writes:

> +/* This index operation is more efficient on many processors */
> +#define ind(mm, x) \
> +  (* (uint32_t *) ((char *) (mm) \
> +                + ((x) & (ISAAC_WORDS - 1) * sizeof (uint32_t))))

A compiler that cannot create identical code when using the following
definition is not worth being called an optimizing compiler.  Broken
compilers should be an excuse for obfuscation.

#define ind(mm, x) ((mm)[(x) & (ISAAC_WORDS - 1)])


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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