| 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 |
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| 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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