Jerome Potts wrote:
i have "-mtune=athlon". Back when i set this up, "mtune" was preferable
to "march". But they are quite similar. And i've had it this way for
quite a long time, and i've never had any reason to change it, and i've
never had this problem.
On Thu, Feb 12, 2009 at 4:16 PM, Ian Lee <[email protected]
<mailto:[email protected]>> wrote:
Try putting -march=athlon in your CFLAGS.
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A quote from http://www.gentoo.org/doc/en/gcc-optimization.xml
"
On x86 and x86-64 CPUs, -march will generate code specifically for that
CPU using all its available instruction sets and the correct ABI; it
will have no backwards compatibility for older/different CPUs. If you
don't need to execute code on anything other than the system you're
running Gentoo on, continue to use -march. You should only consider
using -mtune when you need to generate code for older CPUs such as i386
and i486. -mtune produces more generic code than -march; though it will
tune code for a certain CPU, it doesn't take into account available
instruction sets and ABI. Don't use -mcpu on x86 or x86-64 systems, as
it is deprecated for those arches."
A quote from the gcc man page
" 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. "
Similar problem on this page
http://stackoverflow.com/questions/130740/link-error-when-compiling-gcc-atomic-operation-in-32-bit-mode
They maybe similar but the difference seems to be significant in this
instance, maybe now you have a reason to change it.
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