The translation from LLVM IR to generic machine code is mostly fixed. As a result, instructions can be generated that…
For translating the LLVM IR to generic machine instructions, we only need to implement how arguments and return values are…
Instruction selection via the selection DAG produces fast code, but it takes time to do so. The speed of the…
Creating the target machine and the sub-targetSo far, we’ve implemented the instruction selection classes and a couple of other classes.…
The instruction selection creates machine instructions, represented by the MachineInstr class, from LLVM IR. But this is not the end.…
The target description captures most information about registers and instructions. To access that information, we must implement the M88kRegisterInfo and…
One crucial part is still missing: we need to define the pass that performs the DAG transformations defined in the…
Let’s turn to another important task performed by the M88kISelLowering class. We defined the rules for the calling convention in…
Let’s implement the M88kISelLowering class, which is stored in M88kISelLowering.cpp file, first. The constructor configures the legal types and operations:…
Creating machine instructions from the IR is a very important task in the backend. One common way to implement it…