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Firm is a C-library that provides a graph-based intermediate representation, optimizations, and assembly code generation suitable for use in compilers.


  • Completely graph-based, source- and target-independent intermediate representation in SSA form
  • Accompanying GCC-compatible C frontend with full C99 support
  • Extensive set of optimizations
  • High-quality register allocation
  • Mature code generation support for x86 (32-bit) and SPARC
For a more complete list of features, see our Features page.


If you're interested in trying out Firm, visit the Download page to get you started.
You can also try out Firm in your browser!