1//===-- HexagonSubtarget.cpp - Hexagon Subtarget Information --------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Hexagon specific subclass of TargetSubtarget. 11// 12//===----------------------------------------------------------------------===// 13 14#include "HexagonSubtarget.h" 15#include "Hexagon.h" 16#include "HexagonRegisterInfo.h" 17#include "llvm/Support/CommandLine.h" 18#include "llvm/Support/ErrorHandling.h" 19#include <map> 20 21using namespace llvm; 22 23#define DEBUG_TYPE "hexagon-subtarget" 24 25#define GET_SUBTARGETINFO_CTOR 26#define GET_SUBTARGETINFO_TARGET_DESC 27#include "HexagonGenSubtargetInfo.inc" 28 29static cl::opt<bool> EnableMemOps("enable-hexagon-memops", 30 cl::Hidden, cl::ZeroOrMore, cl::ValueDisallowed, cl::init(true), 31 cl::desc("Generate V4 MEMOP in code generation for Hexagon target")); 32 33static cl::opt<bool> DisableMemOps("disable-hexagon-memops", 34 cl::Hidden, cl::ZeroOrMore, cl::ValueDisallowed, cl::init(false), 35 cl::desc("Do not generate V4 MEMOP in code generation for Hexagon target")); 36 37static cl::opt<bool> EnableIEEERndNear("enable-hexagon-ieee-rnd-near", 38 cl::Hidden, cl::ZeroOrMore, cl::init(false), 39 cl::desc("Generate non-chopped conversion from fp to int.")); 40 41static cl::opt<bool> EnableBSBSched("enable-bsb-sched", 42 cl::Hidden, cl::ZeroOrMore, cl::init(true)); 43 44static cl::opt<bool> EnableHexagonHVXDouble("enable-hexagon-hvx-double", 45 cl::Hidden, cl::ZeroOrMore, cl::init(false), 46 cl::desc("Enable Hexagon Double Vector eXtensions")); 47 48static cl::opt<bool> EnableHexagonHVX("enable-hexagon-hvx", 49 cl::Hidden, cl::ZeroOrMore, cl::init(false), 50 cl::desc("Enable Hexagon Vector eXtensions")); 51 52static cl::opt<bool> DisableHexagonMISched("disable-hexagon-misched", 53 cl::Hidden, cl::ZeroOrMore, cl::init(false), 54 cl::desc("Disable Hexagon MI Scheduling")); 55 56static cl::opt<bool> EnableSubregLiveness("hexagon-subreg-liveness", 57 cl::Hidden, cl::ZeroOrMore, cl::init(false), 58 cl::desc("Enable subregister liveness tracking for Hexagon")); 59 60void HexagonSubtarget::initializeEnvironment() { 61 UseMemOps = false; 62 ModeIEEERndNear = false; 63 UseBSBScheduling = false; 64} 65 66HexagonSubtarget & 67HexagonSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) { 68 CPUString = HEXAGON_MC::selectHexagonCPU(getTargetTriple(), CPU); 69 70 static std::map<StringRef, HexagonArchEnum> CpuTable { 71 { "hexagonv4", V4 }, 72 { "hexagonv5", V5 }, 73 { "hexagonv55", V55 }, 74 { "hexagonv60", V60 }, 75 }; 76 77 auto foundIt = CpuTable.find(CPUString); 78 if (foundIt != CpuTable.end()) 79 HexagonArchVersion = foundIt->second; 80 else 81 llvm_unreachable("Unrecognized Hexagon processor version"); 82 83 UseHVXOps = false; 84 UseHVXDblOps = false; 85 ParseSubtargetFeatures(CPUString, FS); 86 87 if (EnableHexagonHVX.getPosition()) 88 UseHVXOps = EnableHexagonHVX; 89 if (EnableHexagonHVXDouble.getPosition()) 90 UseHVXDblOps = EnableHexagonHVXDouble; 91 92 return *this; 93} 94 95HexagonSubtarget::HexagonSubtarget(const Triple &TT, StringRef CPU, 96 StringRef FS, const TargetMachine &TM) 97 : HexagonGenSubtargetInfo(TT, CPU, FS), CPUString(CPU), 98 InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this), 99 FrameLowering() { 100 101 initializeEnvironment(); 102 103 // Initialize scheduling itinerary for the specified CPU. 104 InstrItins = getInstrItineraryForCPU(CPUString); 105 106 // UseMemOps on by default unless disabled explicitly 107 if (DisableMemOps) 108 UseMemOps = false; 109 else if (EnableMemOps) 110 UseMemOps = true; 111 else 112 UseMemOps = false; 113 114 if (EnableIEEERndNear) 115 ModeIEEERndNear = true; 116 else 117 ModeIEEERndNear = false; 118 119 UseBSBScheduling = hasV60TOps() && EnableBSBSched; 120} 121 122// Pin the vtable to this file. 123void HexagonSubtarget::anchor() {} 124 125bool HexagonSubtarget::enableMachineScheduler() const { 126 if (DisableHexagonMISched.getNumOccurrences()) 127 return !DisableHexagonMISched; 128 return true; 129} 130 131bool HexagonSubtarget::enableSubRegLiveness() const { 132 return EnableSubregLiveness; 133} 134 135