src/codegen/x86_64/CodeGen.zig | 1054 ++++++++++++++++----------------
 src/codegen/x86_64/abi.zig     |   28 +-
 test/c_abi/cfuncs.c            |   15 +
 test/c_abi/main.zig            |   39 +-
 4 files changed, 608 insertions(+), 528 deletions(-)