Perfromance Test Results using gcc-linaro-4.5-2010.11-1
michael.hope at linaro.org
Fri Dec 10 03:37:58 UTC 2010
On Wed, Dec 8, 2010 at 7:10 PM, Michael Hope <michael.hope at linaro.org> wrote:
> On Wed, Dec 8, 2010 at 6:59 PM, Prashanth S <prashanth.s at samsung.com> wrote:
>> Dear All
>> Our team in Samsung collected some performance metrics for the following
>> 3 GCC cross compilers
>> Gentoo Complier(part of Chrome OS Build Environment)
>> GCC 4.4.1 (Code Sourcery).
>> Linaro (gcc-linaro-4.5-2010.11-1)
>> Flags used to Build Linaro Tool chain
>> used Michael Hope Script .Just modified "GCCFLAGS = --with-mode=thumb
>> --with-arch=armv7-a --with-float=softfp --with-fpu=neon
>> Using the above three tool chains we compiled the kernel of Chrome OS and
>> did Coremark Performance test.(With same optimisation flag mentioned in the
>> Test Environment for all the three are the same.
Hi Prashanth. I've been looking at benchmarks and various compilers
during the week. Have a look at:
It's far from complete and only contains a couple of benchmarks on the
A8 only, but it makes interesting Friday afternoon reading.
Note the difference between coremark and pybench which reinforces the
need to pick a benchmark that reflects your workload. coremark is
interesting as the difference is almost solely due to the 'crcu8'
function. GCC 4.4 based compilers unroll it where GCC 4.5 based
compilers don't. Adding '-funroll-all-loops' (which I don't recommend
you do on normal applications) brings the 4.5 based compilers back in
There is work to do here though. It seems that the unrolling
heuristics could be improved, and the 4.4 compilers still win on
coremark at -O3.
More to come...
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