Instruction selection via the selection DAG produces fast code, but it takes time to do so. The speed of the…
After, we define the getSubtargetImpl() method. The sub-target instance to use depends on the target-cpu and target-features function attributes. For…
The implementation of the class is stored in the M88kTargetMachine.cpp file. Please note that we created this file in Chapter…
Finally, we can implement the M88kTargetMachine class. This class holds all used sub-target instances. It also owns a subclass of…
The binary interface of a platform not only defines how parameters are passed. It also includes how a stack frame…
The M88kInstrInfo class has many hook methods we can override to accomplish special tasks, for example, for branch analysis and…
One crucial part is still missing: we need to define the pass that performs the DAG transformations defined in the…
Creating machine instructions from the IR is a very important task in the backend. One common way to implement it…
For a calling convention, there are also more predefined conditions and actions to note. For example, CCIfInReg checks if the…
The heart of any backend is instruction selection. LLVM implements several approaches; in this chapter, we will implement instruction selection…