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//===-- CodeGen/MInstBuilder.h - Simplify creation of MInstcn's -*- C++ -*-===//
//
// This file exposes a function named BuildMInst that is useful for dramatically
// simplifying how MInstruction's are created. Instead of using code like this:
//
// M = new MInstruction(BB, X86::ADDrr32, DestReg);
// M->addOperand(Arg0Reg, MOperand::Register);
// M->addOperand(Arg1Reg, MOperand::Register);
//
// we can now use code like this:
//
// M = BuildMInst(BB, X86::ADDrr8, DestReg).addReg(Arg0Reg).addReg(Arg1Reg);
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MINSTBUILDER_H
#define LLVM_CODEGEN_MINSTBUILDER_H
#include "llvm/CodeGen/MInstruction.h"
struct MInstructionBuilder {
MInstruction *MI;
MInstructionBuilder(MInstruction *mi) : MI(mi) {}
/// Allow automatic conversion to the machine instruction we are working on.
///
operator MInstruction*() const { return MI; }
/// addReg - Add a new register operand...
///
MInstructionBuilder &addReg(unsigned RegNo) {
MI->addOperand(RegNo, MOperand::Register);
return *this;
}
/// addSImm - Add a new sign extended immediate operand...
///
MInstructionBuilder &addSImm(int Val) {
MI->addOperand(Val, MOperand::SignExtImmediate);
return *this;
}
/// addZImm - Add a new zero extended immediate operand...
///
MInstructionBuilder &addZImm(unsigned Val) {
MI->addOperand(Val, MOperand::ZeroExtImmediate);
return *this;
}
/// addPCDisp - Add a PC Relative Displacement operand...
///
MInstructionBuilder &addPCDisp(int Disp) {
MI->addOperand(Disp, MOperand::PCRelativeDisp);
return *this;
}
};
/// BuildMInst - Builder interface. Specify how to create the initial
/// instruction itself.
///
inline MInstructionBuilder BuildMInst(unsigned Opcode, unsigned DestReg = 0) {
return MInstructionBuilder(new MInstruction(Opcode, DestReg));
}
inline MInstructionBuilder BuildMInst(MBasicBlock *BB, unsigned Opcode,
unsigned DestReg = 0) {
return MInstructionBuilder(new MInstruction(BB, Opcode, DestReg));
}
#endif
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