AMD Optimizing C/C++ Compiler
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The AMD Optimizing C/C++ Compiler (AOCC) is a free, open source, optimizing compiler from AMD targeting 32-bit and 64-bit Linux platforms. It is based on LLVM Clang 4.0 with various additional patches to improve performance for AMD's Ryzen microprocessors. AOCC also includes a version of DragonEgg for Fortran sources.[1]
Michael Larabel of Phoronix hasn't found any real advantage of the Advanced Optimizing C/C++ Compiler over mainline Clang in a benchmark.[1]