The trace JIT has an assembler, and the C code is compiled to native assembly. https://bitbucket.org/pypy/pypy/src/f7bc5ed1602fb522625a3d021251770bb5393ee3/rpy

The trace JIT has an assembler, and the C code is compiled to native assembly. https://bitbucket.org/pypy/pypy/src/f7bc5ed1602fb522625a3d021251770bb5393ee3/rpython/jit/backend/x86/assembler.py https://bitbucket.org/pypy/pypy/src/f7bc5ed1602fb522625a3d02... Assembler.py is the jit assembler.