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Re: Question about building hash values from pointers

From: Paolo Bonzini <bonzini at gnu dot org>
To: Kai Tietz <Kai dot Tietz at onevision dot com>
Cc: Andrew Haley <aph at redhat dot com>, gcc at gcc dot gnu dot org, Richard Guenther <richard dot guenther at gmail dot com>
Date: Fri, 30 May 2008 13:27:02 +0200
Subject: Re: Question about building hash values from pointers
References: <483FD1F5.7020407@redhat.com> <OFF0A1D9CE.F26195A5-ONC1257459.003869FB-C1257459.0038AD26@onevision.de>

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.
Right, so the only type remaining is size_t. IIRC there is problem for this type on some targets, too. AFAIC there are 24-bit pointers ... This is the reason, why I was querying to introduce a new general type for such stuff in gcc.

size_t is ok I think, but just in case, there is an autoconf macro (used in libgfortran and libdecnumber) that provides int*_t.

Paolo

References:
- Re: Question about building hash values from pointers
  - From: Andrew Haley
- Re: Question about building hash values from pointers
  - From: Kai Tietz

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