Re: -mtune on intel machine
Re: -mtune on intel machine
- Subject: Re: -mtune on intel machine
- From: Eric Gorr <email@hidden>
- Date: Fri, 15 May 2009 13:27:03 -0400
I did a bit more searching and found this information:
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http://developer.apple.com/documentation/Darwin/Reference/ManPages/man1/i686-apple-darwin9-gcc-4.0.1.1.html
-mtune=cpu-type
Tune to cpu-type everything applicable about the generated code,
except for the ABI and the set of available instructions. The choices
for cpu-type are:
generic
Produce code optimized for the most common IA32/AMD64/EM64T
processors. If you know the CPU on which your code will run, then you
should use the corresponding -mtune option instead of -mtune=generic.
But, if you do not know exactly what CPU users of your application
will have, then you should use this option. As new processors are
deployed in the marketplace, the behavior of this option will change.
Therefore, if you upgrade to a newer version of GCC, the code
generated option will change to reflect the processors that were most
common when that version of GCC was released. There is no -
march=generic option because -march indicates the instruction set the
compiler can use, and there is no generic instruction set applicable
to all processors. In contrast, -mtune indicates the processor (or, in
this case, collection of processors) for which the code is optimized.
--------
Since I don't know exactly on what CPU my users will be running the
application on, I assume that I can set the build option to 'generic'
even though this option does not appear in the popup menu. (The fact
that it does not appear is a bug...?)
Anyone have any comments?
On May 15, 2009, at 1:17 PM, Eric Gorr wrote:
I found this recent message in the archives:
http://lists.apple.com/archives/xcode-users/2009/Apr/msg00357.html
which asks the same question I have, but I didn't see an answer posted
to the mailing list.
What is the correct build setting for mtune now that I am compiling
for intel machines only...?
Does anyone know?
Should it be 'none' now or is this build option just ignored on Intel
machines?
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