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Re: Question about building hash values from pointers

From: Andrew Haley <aph at redhat dot com>
To: Kai Tietz <Kai dot Tietz at onevision dot com>
Cc: gcc at gcc dot gnu dot org
Date: Fri, 30 May 2008 10:45:50 +0100
Subject: Re: Question about building hash values from pointers
References: <OF32DEF3A4.FD0884CD-ONC1257459.00307EA6-C1257459.003132A3@onevision.de>

Kai Tietz wrote:

> as I noticed, most hash value calculations are trying to use pointer 
> values for building the value and assume that a long/unsigned long scalar 
> is wide enough for a pointer. This is at least for w64 target not true. So 
> I want to know, if it would be good to introduce an gcc specific type for 
> those kind of casts, or to use ssize_t/size_t.?

Why would it matter?  Are there any circumstances is which not using the
upper part of an address will reduce performance or break something?

Andrew.

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