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Re: Dirac, GCC-4.0.0 and SIMD optimisations on x86 architecture

From: James E Wilson <wilson at specifixinc dot com>
To: Anuradha Suraparaju <anuradha at rd dot bbc dot co dot uk>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 03 May 2005 16:29:27 -0700
Subject: Re: Dirac, GCC-4.0.0 and SIMD optimisations on x86 architecture
References: <1114620346.5577.5.camel@chandra.dp.rd.bbc.co.uk>

Anuradha Suraparaju wrote:

My question is how do I report this as a bug? What information do I
need to provide in the bug report? Did anybody else face similar
problems with GCC-4.0.0 and MMX-enabled programs.


See
    http://gcc.gnu.org/bugs.html
for info on reporting bugs.

If you can narrow this down to a small testcase, then you are more likely to get a solution from us. If you want us compile the entire Dirac project and take a look, we probably won't bother.

There have been changes to the MMX support in gcc, but without specific details about your testcase, it is hard to say anything definite. For instance, we don't know what the Dirac --enable-mmx option does. Which specific gcc options does it enable?

What about SSE? The SSE support is generally preferred over the older MMX support. Does Dirac make any use of this? If not, perhaps it should. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

Follow-Ups:
- Re: Dirac, GCC-4.0.0 and SIMD optimisations on x86 architecture
  - From: Anuradha Suraparaju

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