GCC 4.9 Shows Little Change For AMD's Kaveri

There are some minor performance changes when compiling various test profiles with GCC 4.9's latest development snapshot in place of GCC 4.8.2, but overall there are no major changes.

The same compiler flags were used during testing of both GCC compiler releases, which for most tests means -O3 and -march=native was set for building the best possible binaries.