105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
//===- HexagonGatherPacketize.cpp -----------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// This pass ensures that producer and consumer of VTMP are paired in a bundle.
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "gather-packetize"
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#include "HexagonTargetMachine.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBundle.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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cl::opt<bool> EnableGatherPacketize(
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"hexagon-enable-gather-packetize", cl::Hidden, cl::init(true),
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cl::desc("Generate gather packets before packetization"));
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namespace llvm {
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FunctionPass *createHexagonGatherPacketize();
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void initializeHexagonGatherPacketizePass(PassRegistry &);
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}
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namespace {
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class HexagonGatherPacketize : public MachineFunctionPass {
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public:
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static char ID;
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HexagonGatherPacketize() : MachineFunctionPass(ID) {
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PassRegistry &Registry = *PassRegistry::getPassRegistry();
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initializeHexagonGatherPacketizePass(Registry);
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}
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StringRef getPassName() const override {
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return "Hexagon Gather Packetize Code";
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}
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bool runOnMachineFunction(MachineFunction &Fn) override;
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};
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char HexagonGatherPacketize::ID = 0;
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static inline bool isVtmpDef(const MachineInstr &MI) {
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for (const MachineOperand &MO : MI.operands())
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if (MO.isReg() && MO.isDef() && MO.isImplicit() &&
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(MO.getReg() == Hexagon::VTMP)) {
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return true;
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}
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return false;
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}
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static inline bool isVtmpUse(const MachineInstr &MI) {
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return (MI.mayStore() && (MI.getOperand(2)).isReg() &&
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((MI.getOperand(2)).getReg() == Hexagon::VTMP));
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}
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bool HexagonGatherPacketize::runOnMachineFunction(MachineFunction &Fn) {
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if (!EnableGatherPacketize)
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return false;
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auto &ST = Fn.getSubtarget<HexagonSubtarget>();
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bool HasV65 = ST.hasV65TOps();
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bool UseHVX = ST.useHVXOps();
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if (!(HasV65 & UseHVX))
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return false;
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for (auto &MBB : Fn) {
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bool VtmpDef = false;
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MachineBasicBlock::iterator MII, MIE, DefMII;
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for (MII = MBB.begin(), MIE = MBB.end(); MII != MIE; ++MII) {
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MachineInstr &MI = *MII;
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if (VtmpDef) {
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if (!isVtmpUse(MI))
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continue;
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MBB.splice(std::next(DefMII), &MBB, MII);
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finalizeBundle(MBB, DefMII.getInstrIterator(),
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std::next(MII).getInstrIterator());
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VtmpDef = false;
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continue;
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}
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if (!(isVtmpDef(MI)))
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continue;
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VtmpDef = true;
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DefMII = MII;
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}
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assert(!VtmpDef && "VTMP producer and consumer not in same block");
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}
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return true;
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}
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}
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//===----------------------------------------------------------------------===//
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// Public Constructor Functions
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//===----------------------------------------------------------------------===//
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INITIALIZE_PASS(HexagonGatherPacketize, "hexagon-gather-packetize",
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"Hexagon gather packetize Code", false, false)
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FunctionPass *llvm::createHexagonGatherPacketize() {
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return new HexagonGatherPacketize();
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}
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