src/codegen/x86_64/CodeGen.zig | 127 +++++++++++++++++---------------
 test/behavior/memcpy.zig       |  29 ++++++++
 test/behavior/memmove.zig      |  29 ++++++++
 test/behavior/memset.zig       |  30 ++++++--
 4 files changed, 148 insertions(+), 67 deletions(-)