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 --with-fpu=vfpv3-d16"

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 attachment)
Test Environment for all the three are the same.

My Questions

Is there any build options that I am missing while I am building the Cross Compiler?
Else is this performance degradation is a know issue and is the tool chain group working on it?.(If so whom to contact?)

Any Pointers from you would be of great help to me.

If you need any further details also do ping me

Regards

Prashanth S