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Re: planner fails on HEAD

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: planner fails on HEAD
Date: 2011-12-05 14:01:52
Message-ID: CAHyXU0yXnbGZCUAtRi4eiMUVabHJ5UjH9p9k=Z8jgA2Co4Zy5g@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sun, Dec 4, 2011 at 4:55 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
>> it looks like gcc bug - gcc 4.5.1 20100924 (Red Hat 4.5.1) It was
>> configured just with --enable-debug and --enable-cassert
>
> Is this x86?  I can't reproduce it on x86_64.

reading all the comments in the gcc bug report, this is because x86
targets the x87 fpu by default which is where the bug is -- it's a
hardware problem.  x86_64 targets sse which has stricter standards for
rounding.  most x86 processors support sse -- is there a reason why we
don't target sse?

merlin

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Subject: Re: [PATCH] PostgreSQL fails to build with 32bit MinGW-w64
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