llvm/llvm/include/llvm/CodeGen/GlobalISel/CSEMIRBuilder.h

//===-- llvm/CodeGen/GlobalISel/CSEMIRBuilder.h  --*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
/// This file implements a version of MachineIRBuilder which CSEs insts within
/// a MachineBasicBlock.
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_GLOBALISEL_CSEMIRBUILDER_H
#define LLVM_CODEGEN_GLOBALISEL_CSEMIRBUILDER_H

#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"

namespace llvm {

class GISelInstProfileBuilder;
/// Defines a builder that does CSE of MachineInstructions using GISelCSEInfo.
/// Eg usage.
///
///
/// GISelCSEInfo *Info =
/// &getAnalysis<GISelCSEAnalysisWrapperPass>().getCSEInfo(); CSEMIRBuilder
/// CB(Builder.getState()); CB.setCSEInfo(Info); auto A = CB.buildConstant(s32,
/// 42); auto B = CB.buildConstant(s32, 42); assert(A == B); unsigned CReg =
/// MRI.createGenericVirtualRegister(s32); auto C = CB.buildConstant(CReg, 42);
/// assert(C->getOpcode() == TargetOpcode::COPY);
/// Explicitly passing in a register would materialize a copy if possible.
/// CSEMIRBuilder also does trivial constant folding for binary ops.
class CSEMIRBuilder : public MachineIRBuilder { … };
} // namespace llvm
#endif