The llvm-mc tool, described as the "LLVM machine code playground",
is used for testing components of a target's MC implementation. The
main task this tool fulfills is to assemble a .s file (via the
-assemble command), disassemble strings of bytes
(-disassemble), as well as show the encoding of
instructions and their internal representations
(-show-encoding and -show-inst
respectively).
In order to determine the architecture, the parameter
-arch=arch is used and
-mattr=a1,+a2,-a3
is used to enable and disable features of the processor required for
instructions to be valid.
An example of the above for the OpenRISC 1000 architecture is the optional
support for multiplication and division instructions. To enable these,
a command like the following would be used.
