Ian Lance Taylor wrote:
"Jan Dillmann" <jan.dillmann@xxxxxxxxxx> writes:
we are running several benchmarks (SpecCPU200...) on 32-bit linux-systems and are able to set an optimization-parameter
for '-march'. We use Intel Core2uo-CPUs. Which parameter should we use (nocona, prescott...) ?
gcc 3.4.3 has no specific tuning for Core2 Duo, if for no other reason
than the release was made before the processors became available. My
guess would be that you will get the best results with -mtune=nocona.
But it is only a guess.
I believe that pentium-m will work better. Nocona (a x86_64 processor)
is based on northwood/prescott core which is a high frequency core with
long pipelines. Core2 Duo is closer to pentium M (lower frequency core
with much shorter pipelines). Although usage of penium-m will result a
bigger code in comparison with nocona because aligning loop/function
will be forced (nortwood core is not so sensitive to aligning therfore
aligining is not done when -mtune=nocona is used). I don't remember
Intel recomendation about aligning code for Core Duo (probably it is the
same as for penium M).
