AMD Optimizing C/C++ and Fortran Compilers (AOCC)

Overview

The AOCC compiler is designed for high-performance x86 CPU compilation of C, C++, and Fortran programming languages. It offers target-dependent and target-independent optimizations, with a particular focus on AMD "Zen" processors. These optimizations provide performance advantage for time-critical applications, especially in the field of high-performance computing (HPC). The AOCC compiler environment streamlines and speeds up the development and tuning process for x86 applications written in C, C++, and Fortran.

AOCC Features

• Platform and Foundation
  Built for 32-bit and 64-bit Linux® platforms, leveraging the robust LLVM™ infrastructure (based on LLVM 17.0.6, Nov 2023) with Clang as the default front-end for C/C++ and Flang for Fortran.
• Architecture Optimization
  Tuned for AMD processors across all “Zen” generations (Zen, Zen2, Zen3, Zen4, Zen5).
• Language Standards and Compliance
  Supports C17 (default for C), C++17 (default for C++), and Fortran F2008 with Real128 features (coarrays not supported);
  OpenMP 5.0 for C/C++ and OpenMP 4.5 for Fortran; DWARFv4 debugging by default with DWARFv5 available for C, C++, and Fortran.
• Advanced Features and Optimizations
  Includes inter/intraprocedural analysis, SLP and loop vectorization, loop optimizations, OpenMP Debugging Interface (OMPD), and CPU offload support for Fortran OpenMP.
• Additional Enhancements
  Optimization level -O2 and -fPIC/-fPIE options are default since 4.1; supports Spack for flexible package management and AMD optimized application recipes.

Notes

1. AOCC compiler binaries depend on Linux® systems having Glibc version 2.28 or later.
2. Since AOCC 4.1, the -fPIC and -fPIE options are enabled by default, which means location-independent code is generated automatically. For AOCC 4.1 or later, any static libraries that were previously built without -fPIC must be rebuilt using these default options; otherwise, linker errors may occur during static linking. Alternatively, you can disable position-independent code generation by specifying -fno-PIC or -fno-PIE when compiling with AOCC.

What’s new in AOCC 5.1 (December 05, 2025)

• Based on LLVM 17.0.6 release (llvm.org, Nov 2023)
• Zen5 tuned AOCL-LibM 5.2 (AMD Math Library)
• Bug fixes impacting performance of C, C++, and Fortran applications
• Deprecated the -finline-aggressive option. Use the -inline-threshold option instead
• Deprecated the -freroll-loops option

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