Compiler selection for log10/Qsort on ARM64

Hi All,

I am working on log10/qsort benchmarks on ARM64 (ARMv8) processor,

I want to check if we have experience with these benchmarks. Actually i am looking for a compiler version which gives best results with these benchmarks and specific compiler optimization (in my case is see O3 gives best numbers) ?

I have tried GCC-4.9 and GCC-6.2 with log10 benchmark and my observations are:

1) With gcc 4.9 - 140 us

2) With GCC 6.2 - 150 us

My compilation flags are "-O3 -ftree-vectorize -funroll-all-loops --param max-inline-insns-auto=550 --param case-values-threshold=30 -falign-functions=32 -ftracer"

So it seems like gcc-6.2 is better, am i missing something, should i use some better compiler flags?

Thanks

-Bharat