RFA: patch - tuning gcc for Intel Nocona (64 bit).

Richard Henderson rth@redhat.com
Thu Apr 1 20:39:00 GMT 2004

On Thu, Apr 01, 2004 at 03:00:09PM -0500, Vladimir Makarov wrote:
>  SPECFP2000 is 28% faster with the tuning.  SPECInt2000 is 0.6%
> faster.  The code size (text segment) is also usually smaller.


>  I see one problem what tunning will be the default for x86_64.  I
> don't think that e.g. Linux distributions will have different code for
> Intel Nocona and AMD Opteron.

Well for most things I'd expect that 0.6% integer improvement to apply.
For bits that the user is compiling themselves for FP, the command-line
switch will be available.

The only thing that raises a flag about this patch is the use of the
"nocona" code name.  Seems like every time we start out using one of
those Intel marketing eventually chooses another name and someone wants
to change gcc to match.  OTOH, Intel marketing seems to take its own
sweet time about such things often leaving us with no other choice...

Anyone else have any thoughts on this subject?


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