| 1 | //===- ReduceVirtualRegisters.cpp - Specialized Delta Pass ----------------===// |
|---|---|
| 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 | // This file implements a function which calls the Generic Delta pass in order |
| 10 | // to simplify virtual registers in MIR. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "ReduceVirtualRegisters.h" |
| 15 | #include "Delta.h" |
| 16 | #include "llvm/CodeGen/MachineModuleInfo.h" |
| 17 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
| 18 | |
| 19 | using namespace llvm; |
| 20 | |
| 21 | static void dropRegisterHintsFromFunction(Oracle &O, MachineFunction &MF) { |
| 22 | MachineRegisterInfo &MRI = MF.getRegInfo(); |
| 23 | for (unsigned I = 0, E = MRI.getNumVirtRegs(); I != E; ++I) { |
| 24 | Register Reg = Register::index2VirtReg(Index: I); |
| 25 | |
| 26 | const std::pair<unsigned, SmallVector<Register, 4>> &Hints = |
| 27 | MRI.getRegAllocationHints(VReg: Reg); |
| 28 | if (Hints.second.empty()) |
| 29 | continue; |
| 30 | |
| 31 | if (!O.shouldKeep()) |
| 32 | MRI.clearSimpleHint(VReg: Reg); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static void dropRegisterHintsFromFunctions(Oracle &O, |
| 37 | ReducerWorkItem &WorkItem) { |
| 38 | for (const Function &F : WorkItem.getModule()) { |
| 39 | if (auto *MF = WorkItem.MMI->getMachineFunction(F)) |
| 40 | dropRegisterHintsFromFunction(O, MF&: *MF); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | void llvm::reduceVirtualRegisterHintsDeltaPass(TestRunner &Test) { |
| 45 | runDeltaPass(Test, ExtractChunksFromModule: dropRegisterHintsFromFunctions, |
| 46 | Message: "Reducing virtual register hints from functions"); |
| 47 | } |
| 48 |