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Re: [Discuss-gnuradio] accuracy problem?
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] accuracy problem? |
Date: |
Wed, 1 Jun 2005 13:46:03 -0700 |
User-agent: |
Mutt/1.5.6i |
On Wed, Jun 01, 2005 at 04:12:16PM -0400, David P. Reed wrote:
> I'm trying to install the gnuradio software from CVS on Fedora Core 3 on
> an AMD64 (x86_64) laptop (and python 2.3). Aside from annoying
> pathname bugs and quirks with FFTW linking, which I will report
> separately, I get the following error when testing gnuradio-core, where
> a unittest fails. Anyone who has a clue why this imprecision might be
> happening? If I change this one test to check for 5 digits after the
> decimal point, it works...
>
> Also, has anyone gotten gnuradio to run on x86_64?
Hi David,
Some folks have GNU Radio running on x86_64. I just took delivery on
one the other day, but haven't had a chance to spend any time with it.
I think the difference you're seeing is that GCC for the x86_64 uses
the SSE scalar mode instructions at 32-bits instead of the x87
instructions with 80-bits of precision.
Eric