May 2015
Intermediate to advanced
296 pages
5h 10m
English
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Implementing the MachineInstrBuilder class
The MachineInstrBuilder class exposes a function called BuildMI(). This function is used to build machine instructions.
How to do it…
Machine instructions are created by using the BuildMI functions, located in the include/llvm/CodeGen/MachineInstrBuilder.h file. The BuildMI functions make it easy to build arbitrary machine instructions.
For example, you can use BuildMI in code snippets for the following purposes:
- To create a
DestReg = mov 42(rendered in the x86 assembly asmov DestReg, 42) instruction:MachineInstr *MI = BuildMI(X86::MOV32ri, 1, DestReg).addImm(42);
- To create the same instruction, but insert it at the end of a basic block:
MachineBasicBlock &MBB = BuildMI(MBB, X86::MOV32ri, 1, DestReg).addImm(42); ...
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