Just a followup on a couple of items that were brought to my attention:
Depending on the instruction set support in the version of gcc that you are
using, you can select
-mssse3 instead of -msse3
Also, please disregard the -static setting. That was an inadvertent copy.
Recommended settings are:
-O3 -m[sse3 or ssse3] -march=Nocona -mfpmath=sse
James
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rose, James
Sent: Thursday, October 16, 2008 2:26 PM
To: [EMAIL PROTECTED]; Speed, Derek
Cc: [EMAIL PROTECTED]
Subject: RE: [Moblin Dev] Recommended gcc flags for Intel Atom processors
There currently aren't any specific Atom optimizations in gcc, but the
following settings have been recommended for use on Atom by the UMG Performance
Team (and verified in some of our performance work):
-O3 -msse3 -march=nocona -mfpmath=sse -static
As a reminder to the list, the Intel compiler for Atom has several
optimizations specifically for this new microarchitecture and is free to use
for code that will be targeted on Atom platforms. The Intel compiler on Linux
has consistently shown significant performance increases on Atom vs. GCC.
Please see:
Intel(r) C++ Software Development Tool Suite 1.0 for Linux* OS Supporting
Mobile Internet Devices
http://www3.intel.com/cd/software/products/asmo-na/eng/386925.htm
James
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Thursday, October 16, 2008 12:33 PM
To: Speed, Derek
Cc: [EMAIL PROTECTED]
Subject: Re: [Moblin Dev] Recommended gcc flags for Intel Atom processors
This would probably be a good thing to stick on a website somewhere too
(if it's not already there).
> I apologize if this has been answered previously on the list, but what
> is the recommended set of flags to use when compiling code using gcc for
> optimal performance on Intel Atom processors?
>
> Thanks,
> Derek, Intel Open Source Technology Center (OTC)
>
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