vendor/llvm/llvm-trunk-r375505vendor/llvm

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/CodeGen/MIRNamerPass.cpp b/lib/CodeGen/MIRNamerPass.cpp
new file mode 100644
index 000000000000..9d719f3917ce
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+++ b/lib/CodeGen/MIRNamerPass.cpp
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+//===----------------------- MIRNamer.cpp - MIR Namer ---------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// The purpose of this pass is to rename virtual register operands with the goal
+// of making it easier to author easier to read tests for MIR. This pass reuses
+// the vreg renamer used by MIRCanonicalizerPass.
+//
+// Basic Usage:
+//
+// llc -o - -run-pass mir-namer example.mir
+//
+//===----------------------------------------------------------------------===//
+
+#include "MIRVRegNamerUtils.h"
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/Passes.h"
+
+using namespace llvm;
+
+namespace llvm {
+extern char &MIRNamerID;
+} // namespace llvm
+
+#define DEBUG_TYPE "mir-namer"
+
+namespace {
+
+class MIRNamer : public MachineFunctionPass {
+public:
+  static char ID;
+  MIRNamer() : MachineFunctionPass(ID) {}
+
+  StringRef getPassName() const override {
+    return "Rename virtual register operands";
+  }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.setPreservesCFG();
+    MachineFunctionPass::getAnalysisUsage(AU);
+  }
+
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    bool Changed = false;
+
+    if (MF.empty())
+      return Changed;
+
+    NamedVRegCursor NVC(MF.getRegInfo());
+
+    ReversePostOrderTraversal<MachineBasicBlock *> RPOT(&*MF.begin());
+    for (auto &MBB : RPOT)
+      Changed |= NVC.renameVRegs(MBB);
+
+    return Changed;
+  }
+};
+
+} // end anonymous namespace
+
+char MIRNamer::ID;
+
+char &llvm::MIRNamerID = MIRNamer::ID;
+
+INITIALIZE_PASS_BEGIN(MIRNamer, "mir-namer", "Rename Register Operands", false,
+                      false)
+
+INITIALIZE_PASS_END(MIRNamer, "mir-namer", "Rename Register Operands", false,
+                    false)