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Re: planner fails on HEAD

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Merlin Moncure <mmoncure(at)gmail(dot)com>
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 15:30:54
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
> 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?

Well, older machines won't have sse, and in any case I think x86 is not
the only architecture with the issue, just the most popular one.
Floating-point registers that are wider than standard double are hardly
an unusual idea.

			regards, tom lane

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