| 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 | |
|---|
| 24 | using namespace llvm; |
|---|
| 25 | |
|---|
| 26 | namespace llvm { |
|---|
| 27 | extern char &MIRNamerID; |
|---|
| 28 | } // namespace llvm |
|---|
| 29 | |
|---|
| 30 | #define DEBUG_TYPE "mir-namer" |
|---|
| 31 | |
|---|
| 32 | namespace { |
|---|
| 33 | |
|---|
| 34 | class MIRNamer : public MachineFunctionPass { |
|---|
| 35 | public: |
|---|
| 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 | |
|---|
| 67 | char MIRNamer::ID; |
|---|
| 68 | |
|---|
| 69 | char &llvm::MIRNamerID = MIRNamer::ID; |
|---|
| 70 | |
|---|
| 71 | INITIALIZE_PASS_BEGIN(MIRNamer, "mir-namer" , "Rename Register Operands" , false, |
|---|
| 72 | false) |
|---|
| 73 | |
|---|
| 74 | INITIALIZE_PASS_END(MIRNamer, "mir-namer" , "Rename Register Operands" , false, |
|---|
| 75 | false) |
|---|
| 76 | |
|---|
