1//===----------------------- MIRNamer.cpp - MIR Namer ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// The purpose of this pass is to rename virtual register operands with the goal
10// of making it easier to author easier to read tests for MIR. This pass reuses
11// the vreg renamer used by MIRCanonicalizerPass.
12//
13// Basic Usage:
14//
15// llc -o - -run-pass mir-namer example.mir
16//
17//===----------------------------------------------------------------------===//
18
19#include "MIRVRegNamerUtils.h"
20#include "llvm/ADT/PostOrderIterator.h"
21#include "llvm/CodeGen/MachineFunctionPass.h"
22#include "llvm/InitializePasses.h"
23
24using namespace llvm;
25
26namespace llvm {
27extern char &MIRNamerID;
28} // namespace llvm
29
30#define DEBUG_TYPE "mir-namer"
31
32namespace {
33
34class MIRNamer : public MachineFunctionPass {
35public:
36 static char ID;
37 MIRNamer() : MachineFunctionPass(ID) {}
38
39 StringRef getPassName() const override {
40 return "Rename virtual register operands";
41 }
42
43 void getAnalysisUsage(AnalysisUsage &AU) const override {
44 AU.setPreservesCFG();
45 MachineFunctionPass::getAnalysisUsage(AU);
46 }
47
48 bool runOnMachineFunction(MachineFunction &MF) override {
49 bool Changed = false;
50
51 if (MF.empty())
52 return Changed;
53
54 VRegRenamer Renamer(MF.getRegInfo());
55
56 unsigned BBIndex = 0;
57 ReversePostOrderTraversal<MachineBasicBlock *> RPOT(&*MF.begin());
58 for (auto &MBB : RPOT)
59 Changed |= Renamer.renameVRegs(MBB, BBNum: BBIndex++);
60
61 return Changed;
62 }
63};
64
65} // end anonymous namespace
66
67char MIRNamer::ID;
68
69char &llvm::MIRNamerID = MIRNamer::ID;
70
71INITIALIZE_PASS_BEGIN(MIRNamer, "mir-namer", "Rename Register Operands", false,
72 false)
73
74INITIALIZE_PASS_END(MIRNamer, "mir-namer", "Rename Register Operands", false,
75 false)
76