1ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande//===-- HexagonPeephole.cpp - Hexagon Peephole Optimiztions ---------------===// 2ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 3ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// The LLVM Compiler Infrastructure 4ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 5ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// This file is distributed under the University of Illinois Open Source 6ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// License. See LICENSE.TXT for details. 7ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 8ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// This peephole pass optimizes in the following cases. 9ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 1. Optimizes redundant sign extends for the following case 10ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// Transform the following pattern 11ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg170<def> = SXTW %vreg166 12ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// ... 13ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg176<def> = COPY %vreg170:subreg_loreg 14ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 15ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// Into 16ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg176<def> = COPY vreg166 17ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 18ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 2. Optimizes redundant negation of predicates. 19ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg15<def> = CMPGTrr %vreg6, %vreg2 20ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// ... 21ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg16<def> = NOT_p %vreg15<kill> 22ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// ... 23ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// JMP_c %vreg16<kill>, <BB#1>, %PC<imp-def,dead> 24ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 25ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// Into 26ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg15<def> = CMPGTrr %vreg6, %vreg2; 27ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// ... 28ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// JMP_cNot %vreg15<kill>, <BB#1>, %PC<imp-def,dead>; 29ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// 30ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// Note: The peephole pass makes the instrucstions like 31ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// %vreg170<def> = SXTW %vreg166 or %vreg16<def> = NOT_p %vreg15<kill> 32ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// redundant and relies on some form of dead removal instrucions, like 33ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande// DCE or DIE to actually eliminate them. 34ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 35ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 36ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande//===----------------------------------------------------------------------===// 37ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 38ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#define DEBUG_TYPE "hexagon-peephole" 3979aa3417eb6f58d668aadfedf075240a41d35a26Craig Topper#include "Hexagon.h" 4079aa3417eb6f58d668aadfedf075240a41d35a26Craig Topper#include "HexagonTargetMachine.h" 41ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/Constants.h" 42ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/PassSupport.h" 43ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/ADT/DenseMap.h" 44ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/ADT/Statistic.h" 45ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/CodeGen/Passes.h" 46ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/CodeGen/MachineFunction.h" 47ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/CodeGen/MachineFunctionPass.h" 48ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/CodeGen/MachineInstrBuilder.h" 49ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/CodeGen/MachineRegisterInfo.h" 5079aa3417eb6f58d668aadfedf075240a41d35a26Craig Topper#include "llvm/Support/CommandLine.h" 51ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/Support/Debug.h" 52ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/Support/raw_ostream.h" 53ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/Target/TargetMachine.h" 54ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/Target/TargetRegisterInfo.h" 55ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include "llvm/Target/TargetInstrInfo.h" 56ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande#include <algorithm> 57ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 58ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandeusing namespace llvm; 59ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 60ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandestatic cl::opt<bool> DisableHexagonPeephole("disable-hexagon-peephole", 61ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::Hidden, cl::ZeroOrMore, cl::init(false), 62ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::desc("Disable Peephole Optimization")); 63ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 64ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandestatic cl::opt<int> 65ab7955b9ce3197215406bc9fc97b22074127d035Sirish PandeDbgPNPCount("pnp-count", cl::init(-1), cl::Hidden, 66ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::desc("Maximum number of P=NOT(P) to be optimized")); 67ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 68ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandestatic cl::opt<bool> DisablePNotP("disable-hexagon-pnotp", 69ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::Hidden, cl::ZeroOrMore, cl::init(false), 70ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::desc("Disable Optimization of PNotP")); 71ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 72ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandestatic cl::opt<bool> DisableOptSZExt("disable-hexagon-optszext", 73ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::Hidden, cl::ZeroOrMore, cl::init(false), 74ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande cl::desc("Disable Optimization of Sign/Zero Extends")); 75ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 76ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandenamespace { 77ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande struct HexagonPeephole : public MachineFunctionPass { 78ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande const HexagonInstrInfo *QII; 79ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande const HexagonRegisterInfo *QRI; 80ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande const MachineRegisterInfo *MRI; 81ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 82ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande public: 83ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande static char ID; 84ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande HexagonPeephole() : MachineFunctionPass(ID) { } 85ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 86ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande bool runOnMachineFunction(MachineFunction &MF); 87ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 88ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande const char *getPassName() const { 89ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande return "Hexagon optimize redundant zero and size extends"; 90ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 91ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 92ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande void getAnalysisUsage(AnalysisUsage &AU) const { 93ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineFunctionPass::getAnalysisUsage(AU); 94ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 95ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 96ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande private: 97ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande void ChangeOpInto(MachineOperand &Dst, MachineOperand &Src); 98ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande }; 99ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande} 100ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 101ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandechar HexagonPeephole::ID = 0; 102ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 103ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandebool HexagonPeephole::runOnMachineFunction(MachineFunction &MF) { 104ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 105ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande QII = static_cast<const HexagonInstrInfo *>(MF.getTarget(). 106ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande getInstrInfo()); 107ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande QRI = static_cast<const HexagonRegisterInfo *>(MF.getTarget(). 108ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande getRegisterInfo()); 109ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MRI = &MF.getRegInfo(); 110ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 111ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande DenseMap<unsigned, unsigned> PeepholeMap; 1124c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar DenseMap<unsigned, std::pair<unsigned, unsigned> > PeepholeDoubleRegsMap; 113ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 114ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (DisableHexagonPeephole) return false; 115ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 116ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Loop over all of the basic blocks. 117ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande for (MachineFunction::iterator MBBb = MF.begin(), MBBe = MF.end(); 118ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MBBb != MBBe; ++MBBb) { 119ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineBasicBlock* MBB = MBBb; 120ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande PeepholeMap.clear(); 1214c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar PeepholeDoubleRegsMap.clear(); 122ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 123ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Traverse the basic block. 124ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande for (MachineBasicBlock::iterator MII = MBB->begin(); MII != MBB->end(); 125ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande ++MII) { 126ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineInstr *MI = MII; 127ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Look for sign extends: 128ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // %vreg170<def> = SXTW %vreg166 129ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (!DisableOptSZExt && MI->getOpcode() == Hexagon::SXTW) { 130ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande assert (MI->getNumOperands() == 2); 131ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Dst = MI->getOperand(0); 132ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Src = MI->getOperand(1); 133ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned DstReg = Dst.getReg(); 134ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned SrcReg = Src.getReg(); 135ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Just handle virtual registers. 136ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (TargetRegisterInfo::isVirtualRegister(DstReg) && 137ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande TargetRegisterInfo::isVirtualRegister(SrcReg)) { 138ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Map the following: 139ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // %vreg170<def> = SXTW %vreg166 140ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // PeepholeMap[170] = vreg166 141ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande PeepholeMap[DstReg] = SrcReg; 142ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 143ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 144ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 1454c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar // Look for this sequence below 1464c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar // %vregDoubleReg1 = LSRd_ri %vregDoubleReg0, 32 1474c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar // %vregIntReg = COPY %vregDoubleReg1:subreg_loreg. 1484c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar // and convert into 1494c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar // %vregIntReg = COPY %vregDoubleReg0:subreg_hireg. 1504c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar if (MI->getOpcode() == Hexagon::LSRd_ri) { 1514c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar assert(MI->getNumOperands() == 3); 1524c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar MachineOperand &Dst = MI->getOperand(0); 1534c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar MachineOperand &Src1 = MI->getOperand(1); 1544c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar MachineOperand &Src2 = MI->getOperand(2); 1554c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar if (Src2.getImm() != 32) 1564c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar continue; 1574c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar unsigned DstReg = Dst.getReg(); 1584c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar unsigned SrcReg = Src1.getReg(); 1594c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar PeepholeDoubleRegsMap[DstReg] = 1604c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar std::make_pair(*&SrcReg, 1/*Hexagon::subreg_hireg*/); 1614c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar } 1624c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar 163ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Look for P=NOT(P). 164ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (!DisablePNotP && 165ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande (MI->getOpcode() == Hexagon::NOT_p)) { 166ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande assert (MI->getNumOperands() == 2); 167ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Dst = MI->getOperand(0); 168ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Src = MI->getOperand(1); 169ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned DstReg = Dst.getReg(); 170ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned SrcReg = Src.getReg(); 171ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Just handle virtual registers. 172ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (TargetRegisterInfo::isVirtualRegister(DstReg) && 173ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande TargetRegisterInfo::isVirtualRegister(SrcReg)) { 174ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Map the following: 175ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // %vreg170<def> = NOT_xx %vreg166 176ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // PeepholeMap[170] = vreg166 177ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande PeepholeMap[DstReg] = SrcReg; 178ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 179ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 180ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 181ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Look for copy: 182ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // %vreg176<def> = COPY %vreg170:subreg_loreg 183ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (!DisableOptSZExt && MI->isCopy()) { 184ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande assert (MI->getNumOperands() == 2); 185ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Dst = MI->getOperand(0); 186ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Src = MI->getOperand(1); 187ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 188ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Make sure we are copying the lower 32 bits. 189ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (Src.getSubReg() != Hexagon::subreg_loreg) 190ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande continue; 191ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 192ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned DstReg = Dst.getReg(); 193ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned SrcReg = Src.getReg(); 194ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (TargetRegisterInfo::isVirtualRegister(DstReg) && 195ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande TargetRegisterInfo::isVirtualRegister(SrcReg)) { 196ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Try to find in the map. 197ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (unsigned PeepholeSrc = PeepholeMap.lookup(SrcReg)) { 198ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Change the 1st operand. 199ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MI->RemoveOperand(1); 200ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MI->addOperand(MachineOperand::CreateReg(PeepholeSrc, false)); 2014c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar } else { 2024c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar DenseMap<unsigned, std::pair<unsigned, unsigned> >::iterator DI = 2034c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar PeepholeDoubleRegsMap.find(SrcReg); 2044c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar if (DI != PeepholeDoubleRegsMap.end()) { 2054c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar std::pair<unsigned,unsigned> PeepholeSrc = DI->second; 2064c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar MI->RemoveOperand(1); 2074c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar MI->addOperand(MachineOperand::CreateReg(PeepholeSrc.first, 2084c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar false /*isDef*/, 2094c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar false /*isImp*/, 2104c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar false /*isKill*/, 2114c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar false /*isDead*/, 2124c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar false /*isUndef*/, 2134c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar false /*isEarlyClobber*/, 2144c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar PeepholeSrc.second)); 2154c3d3ecdf83cc85e81f2146f2942cf6931e9ce18Pranav Bhandarkar } 216ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 217ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 218ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 219ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 220ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Look for Predicated instructions. 221ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (!DisablePNotP) { 222ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande bool Done = false; 223ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (QII->isPredicated(MI)) { 224ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand &Op0 = MI->getOperand(0); 225ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned Reg0 = Op0.getReg(); 226ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande const TargetRegisterClass *RC0 = MRI->getRegClass(Reg0); 227ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (RC0->getID() == Hexagon::PredRegsRegClassID) { 228ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Handle instructions that have a prediate register in op0 229ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // (most cases of predicable instructions). 230ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (TargetRegisterInfo::isVirtualRegister(Reg0)) { 231ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Try to find in the map. 232ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (unsigned PeepholeSrc = PeepholeMap.lookup(Reg0)) { 233ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Change the 1st operand and, flip the opcode. 234ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MI->getOperand(0).setReg(PeepholeSrc); 235ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande int NewOp = QII->getInvertedPredicatedOpcode(MI->getOpcode()); 236ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MI->setDesc(QII->get(NewOp)); 237ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Done = true; 238ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 239ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 240ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 241ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 242ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 243ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (!Done) { 244ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Handle special instructions. 245ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned Op = MI->getOpcode(); 246ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned NewOp = 0; 247ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned PR = 1, S1 = 2, S2 = 3; // Operand indices. 248ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 249ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande switch (Op) { 250ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::TFR_condset_rr: 251ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::TFR_condset_ii: 252ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::MUX_ii: 253ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::MUX_rr: 254ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande NewOp = Op; 255ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 256ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::TFR_condset_ri: 257ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande NewOp = Hexagon::TFR_condset_ir; 258ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 259ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::TFR_condset_ir: 260ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande NewOp = Hexagon::TFR_condset_ri; 261ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 262ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::MUX_ri: 263ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande NewOp = Hexagon::MUX_ir; 264ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 265ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case Hexagon::MUX_ir: 266ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande NewOp = Hexagon::MUX_ri; 267ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 268ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 269ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (NewOp) { 270ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande unsigned PSrc = MI->getOperand(PR).getReg(); 271ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (unsigned POrig = PeepholeMap.lookup(PSrc)) { 272ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MI->getOperand(PR).setReg(POrig); 273ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MI->setDesc(QII->get(NewOp)); 274ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande // Swap operands S1 and S2. 275ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand Op1 = MI->getOperand(S1); 276ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande MachineOperand Op2 = MI->getOperand(S2); 277ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande ChangeOpInto(MI->getOperand(S1), Op2); 278ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande ChangeOpInto(MI->getOperand(S2), Op1); 279ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 280ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } // if (NewOp) 281ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } // if (!Done) 282ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 283ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } // if (!DisablePNotP) 284ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 285ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } // Instruction 286ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } // Basic Block 287ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande return true; 288ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande} 289ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 290ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pandevoid HexagonPeephole::ChangeOpInto(MachineOperand &Dst, MachineOperand &Src) { 291ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande assert (&Dst != &Src && "Cannot duplicate into itself"); 292ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande switch (Dst.getType()) { 293ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case MachineOperand::MO_Register: 294ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (Src.isReg()) { 295ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Dst.setReg(Src.getReg()); 296ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } else if (Src.isImm()) { 297ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Dst.ChangeToImmediate(Src.getImm()); 298ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } else { 299ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande llvm_unreachable("Unexpected src operand type"); 300ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 301ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 302ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 303ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande case MachineOperand::MO_Immediate: 304ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande if (Src.isImm()) { 305ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Dst.setImm(Src.getImm()); 306ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } else if (Src.isReg()) { 307ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Dst.ChangeToRegister(Src.getReg(), Src.isDef(), Src.isImplicit(), 308ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Src.isKill(), Src.isDead(), Src.isUndef(), 309ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande Src.isDebug()); 310ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } else { 311ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande llvm_unreachable("Unexpected src operand type"); 312ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 313ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 314ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 315ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande default: 316ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande llvm_unreachable("Unexpected dst operand type"); 317ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande break; 318ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande } 319ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande} 320ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande 321ab7955b9ce3197215406bc9fc97b22074127d035Sirish PandeFunctionPass *llvm::createHexagonPeephole() { 322ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande return new HexagonPeephole(); 323ab7955b9ce3197215406bc9fc97b22074127d035Sirish Pande} 324