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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
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//===------------ MIRVRegNamerUtils.h - MIR VReg Renaming Utilities -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// The purpose of these utilities is to abstract out parts of the MIRCanon pass
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// that are responsible for renaming virtual registers with the purpose of
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// sharing code with a MIRVRegNamer pass that could be the analog of the
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// opt -instnamer pass.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_MIRVREGNAMERUTILS_H
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#define LLVM_LIB_CODEGEN_MIRVREGNAMERUTILS_H
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#include "llvm/CodeGen/Register.h"
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#include <map>
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#include <vector>
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#include <string>
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namespace llvm {
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class MachineBasicBlock;
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class MachineInstr;
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class MachineRegisterInfo;
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class StringRef;
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/// VRegRenamer - This class is used for renaming vregs in a machine basic
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/// block according to semantics of the instruction.
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class VRegRenamer {
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class NamedVReg {
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Register Reg;
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std::string Name;
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public:
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NamedVReg(Register Reg, std::string Name = "") : Reg(Reg), Name(Name) {}
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NamedVReg(std::string Name = "") : Reg(~0U), Name(Name) {}
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const std::string &getName() const { return Name; }
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Register getReg() const { return Reg; }
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};
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MachineRegisterInfo &MRI;
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unsigned CurrentBBNumber = 0;
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/// Given an Instruction, construct a hash of the operands
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/// of the instructions along with the opcode.
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/// When dealing with virtual registers, just hash the opcode of
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/// the instruction defining that vreg.
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/// Handle immediates, registers (physical and virtual) explicitly,
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/// and return a common value for the other cases.
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/// Instruction will be named in the following scheme
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/// bb<block_no>_hash_<collission_count>.
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std::string getInstructionOpcodeHash(MachineInstr &MI);
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/// For all the VRegs that are candidates for renaming,
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/// return a mapping from old vregs to new vregs with names.
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std::map<unsigned, unsigned>
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getVRegRenameMap(const std::vector<NamedVReg> &VRegs);
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/// Perform replacing of registers based on the <old,new> vreg map.
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bool doVRegRenaming(const std::map<unsigned, unsigned> &VRegRenameMap);
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/// createVirtualRegister - Given an existing vreg, create a named vreg to
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/// take its place. The name is determined by calling
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/// getInstructionOpcodeHash.
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unsigned createVirtualRegister(unsigned VReg);
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/// Create a vreg with name and return it.
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unsigned createVirtualRegisterWithLowerName(unsigned VReg, StringRef Name);
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/// Linearly traverse the MachineBasicBlock and rename each instruction's
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/// vreg definition based on the semantics of the instruction.
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/// Names are as follows bb<BBNum>_hash_[0-9]+
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bool renameInstsInMBB(MachineBasicBlock *MBB);
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public:
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VRegRenamer() = delete;
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VRegRenamer(MachineRegisterInfo &MRI) : MRI(MRI) {}
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/// Same as the above, but sets a BBNum depending on BB traversal that
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/// will be used as prefix for the vreg names.
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bool renameVRegs(MachineBasicBlock *MBB, unsigned BBNum) {
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CurrentBBNumber = BBNum;
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return renameInstsInMBB(MBB);
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}
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};
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} // namespace llvm
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#endif
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