Hm, never heard about Open64 before. Also, as Confusion said, from looking on their homepage, I didn't really get what it was. Wikipedia helped a bit: http://e

Hm, never heard about Open64 before. Also, as Confusion said, from looking on their homepage, I didn't really get what it was. Wikipedia helped a bit: http://en.wikipedia.org/wiki/Open64 http://en.wikipedia.org/wiki/Open64 So, a C/C++ and Fortran compiler. It seems it actually doesn't do parsing itself and rather just uses some other frontend for the parsing (GCC in case of C/C++). So it seems to be just the backend including some optimizations. I still don't really get from there how it compares to GCC or LLVM.