On 24 June 2014 15:11, Vladimir Makarov <vmaka...@redhat.com> wrote: > A few people asked me about new performance comparison of latest GCC > and LLVM. So I've finished it and put it on my site > > http://vmakarov.fedorapeople.org/spec/ > > The comparison is achievable from 2014 link and links under it in > the left frame.
Hi Vladimir, Nice comparison! It's on the same ballpark of my own findings (with SPEC and other benchmarks) on ARM: +10% performance, but also code size for GCC over LLVM, and massive compilation time savings on LLVM. I wonder how much of that is due to auto-vectorization (on LLVM, -O2+ turns it on, I suppose GCC is only on -O3?). From Ramana's point, there may be nothing serious if you haven't enabled NEON, though. Also interesting to see the impact of LTO being a major drive in recent performance improvements on both compilers. cheers, --renato
