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Re: Question about building hash values from pointers

From: Andrew Haley <aph at redhat dot com>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: Kai Tietz <Kai dot Tietz at onevision dot com>, gcc at gcc dot gnu dot org
Date: Fri, 30 May 2008 11:07:49 +0100
Subject: Re: Question about building hash values from pointers
References: <OF32DEF3A4.FD0884CD-ONC1257459.00307EA6-C1257459.003132A3@onevision.de> <84fc9c000805300259l5eadc01eh9f1a02d826ab990f@mail.gmail.com>

Richard Guenther wrote:
> On Fri, May 30, 2008 at 10:57 AM, Kai Tietz <Kai.Tietz@onevision.com> wrote:
>> Hi,
>>
>> 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.?
> 
> it's uintptr_t which should be used, if only as an intermediate cast -
> (unsigned long)(uintptr_t)ptr.

That's not possible because, IIRC, gcc must compile on C90 systems.

Andrew.

Follow-Ups:
- Re: Question about building hash values from pointers
  - From: Kai Tietz
- Re: Question about building hash values from pointers
  - From: Ian Lance Taylor

References:
- Question about building hash values from pointers
  - From: Kai Tietz
- Re: Question about building hash values from pointers
  - From: Richard Guenther

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