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Re: [Bug middle-end/18574] [4.0 Regression] bootstrap comprisonfailed

From: Jeffrey A Law <law at redhat dot com>
To: gcc-bugzilla at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Sun, 21 Nov 2004 08:02:59 -0700
Subject: Re: [Bug middle-end/18574] [4.0 Regression] bootstrap comprisonfailed
Organization: Red Hat, Inc
References: <20041120004245.18574.hjl@lucon.org> <20041121051528.26882.qmail@sourceware.org>
Reply-to: law at redhat dot com

I've been unable to reproduce the comparison failures.  However, as I
outlined in an earlier message, I have come up with a scenario in which
my patch might cause a comparison failure.

This patch changes the hashing routine to use block indices rather
than hash on pointers.  That ought to stabilize the hash (and thus the
hash table traversals and SSA_NAME coalescing) in cases where it
was unstable before.

Since I've been unable to trigger the failure here, I can't say for
certain whether or not this patch fixes the bootstrap failures others
have seen.

FWIW, this has been bootstrapped and regression tested on
i686-pc-linux-gnu.

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Follow-Ups:
- Re: [Bug middle-end/18574] [4.0 Regression] bootstrap comprisonfailed
  - From: Diego Novillo
- Re: [Bug middle-end/18574] [4.0 Regression] bootstrap comprison failed
  - From: Stan Shebs

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