1 //===----------------------------------------------------------------------===// 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 #include "AMDGPU.h" 10 #include "AMDGPUArgumentUsageInfo.h" 11 #include "AMDGPUTargetMachine.h" 12 #include "MCTargetDesc/AMDGPUMCTargetDesc.h" 13 #include "SIRegisterInfo.h" 14 #include "llvm/Support/NativeFormatting.h" 15 #include "llvm/Support/raw_ostream.h" 16 17 using namespace llvm; 18 19 #define DEBUG_TYPE "amdgpu-argument-reg-usage-info" 20 21 INITIALIZE_PASS(AMDGPUArgumentUsageInfo, DEBUG_TYPE, 22 "Argument Register Usage Information Storage", false, true) 23 24 void ArgDescriptor::print(raw_ostream &OS, 25 const TargetRegisterInfo *TRI) const { 26 if (!isSet()) { 27 OS << "<not set>\n"; 28 return; 29 } 30 31 if (isRegister()) 32 OS << "Reg " << printReg(getRegister(), TRI); 33 else 34 OS << "Stack offset " << getStackOffset(); 35 36 if (isMasked()) { 37 OS << " & "; 38 llvm::write_hex(OS, Mask, llvm::HexPrintStyle::PrefixLower); 39 } 40 41 OS << '\n'; 42 } 43 44 char AMDGPUArgumentUsageInfo::ID = 0; 45 46 const AMDGPUFunctionArgInfo AMDGPUArgumentUsageInfo::ExternFunctionInfo{}; 47 48 // Hardcoded registers from fixed function ABI 49 const AMDGPUFunctionArgInfo AMDGPUArgumentUsageInfo::FixedABIFunctionInfo 50 = AMDGPUFunctionArgInfo::fixedABILayout(); 51 52 bool AMDGPUArgumentUsageInfo::doInitialization(Module &M) { 53 return false; 54 } 55 56 bool AMDGPUArgumentUsageInfo::doFinalization(Module &M) { 57 ArgInfoMap.clear(); 58 return false; 59 } 60 61 void AMDGPUArgumentUsageInfo::print(raw_ostream &OS, const Module *M) const { 62 for (const auto &FI : ArgInfoMap) { 63 OS << "Arguments for " << FI.first->getName() << '\n' 64 << " PrivateSegmentBuffer: " << FI.second.PrivateSegmentBuffer 65 << " DispatchPtr: " << FI.second.DispatchPtr 66 << " QueuePtr: " << FI.second.QueuePtr 67 << " KernargSegmentPtr: " << FI.second.KernargSegmentPtr 68 << " DispatchID: " << FI.second.DispatchID 69 << " FlatScratchInit: " << FI.second.FlatScratchInit 70 << " PrivateSegmentSize: " << FI.second.PrivateSegmentSize 71 << " WorkGroupIDX: " << FI.second.WorkGroupIDX 72 << " WorkGroupIDY: " << FI.second.WorkGroupIDY 73 << " WorkGroupIDZ: " << FI.second.WorkGroupIDZ 74 << " WorkGroupInfo: " << FI.second.WorkGroupInfo 75 << " PrivateSegmentWaveByteOffset: " 76 << FI.second.PrivateSegmentWaveByteOffset 77 << " ImplicitBufferPtr: " << FI.second.ImplicitBufferPtr 78 << " ImplicitArgPtr: " << FI.second.ImplicitArgPtr 79 << " WorkItemIDX " << FI.second.WorkItemIDX 80 << " WorkItemIDY " << FI.second.WorkItemIDY 81 << " WorkItemIDZ " << FI.second.WorkItemIDZ 82 << '\n'; 83 } 84 } 85 86 std::pair<const ArgDescriptor *, const TargetRegisterClass *> 87 AMDGPUFunctionArgInfo::getPreloadedValue( 88 AMDGPUFunctionArgInfo::PreloadedValue Value) const { 89 switch (Value) { 90 case AMDGPUFunctionArgInfo::PRIVATE_SEGMENT_BUFFER: { 91 return std::make_pair( 92 PrivateSegmentBuffer ? &PrivateSegmentBuffer : nullptr, 93 &AMDGPU::SGPR_128RegClass); 94 } 95 case AMDGPUFunctionArgInfo::IMPLICIT_BUFFER_PTR: 96 return std::make_pair(ImplicitBufferPtr ? &ImplicitBufferPtr : nullptr, 97 &AMDGPU::SGPR_64RegClass); 98 case AMDGPUFunctionArgInfo::WORKGROUP_ID_X: 99 return std::make_pair(WorkGroupIDX ? &WorkGroupIDX : nullptr, 100 &AMDGPU::SGPR_32RegClass); 101 102 case AMDGPUFunctionArgInfo::WORKGROUP_ID_Y: 103 return std::make_pair(WorkGroupIDY ? &WorkGroupIDY : nullptr, 104 &AMDGPU::SGPR_32RegClass); 105 case AMDGPUFunctionArgInfo::WORKGROUP_ID_Z: 106 return std::make_pair(WorkGroupIDZ ? &WorkGroupIDZ : nullptr, 107 &AMDGPU::SGPR_32RegClass); 108 case AMDGPUFunctionArgInfo::PRIVATE_SEGMENT_WAVE_BYTE_OFFSET: 109 return std::make_pair( 110 PrivateSegmentWaveByteOffset ? &PrivateSegmentWaveByteOffset : nullptr, 111 &AMDGPU::SGPR_32RegClass); 112 case AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR: 113 return std::make_pair(KernargSegmentPtr ? &KernargSegmentPtr : nullptr, 114 &AMDGPU::SGPR_64RegClass); 115 case AMDGPUFunctionArgInfo::IMPLICIT_ARG_PTR: 116 return std::make_pair(ImplicitArgPtr ? &ImplicitArgPtr : nullptr, 117 &AMDGPU::SGPR_64RegClass); 118 case AMDGPUFunctionArgInfo::DISPATCH_ID: 119 return std::make_pair(DispatchID ? &DispatchID : nullptr, 120 &AMDGPU::SGPR_64RegClass); 121 case AMDGPUFunctionArgInfo::FLAT_SCRATCH_INIT: 122 return std::make_pair(FlatScratchInit ? &FlatScratchInit : nullptr, 123 &AMDGPU::SGPR_64RegClass); 124 case AMDGPUFunctionArgInfo::DISPATCH_PTR: 125 return std::make_pair(DispatchPtr ? &DispatchPtr : nullptr, 126 &AMDGPU::SGPR_64RegClass); 127 case AMDGPUFunctionArgInfo::QUEUE_PTR: 128 return std::make_pair(QueuePtr ? &QueuePtr : nullptr, 129 &AMDGPU::SGPR_64RegClass); 130 case AMDGPUFunctionArgInfo::WORKITEM_ID_X: 131 return std::make_pair(WorkItemIDX ? &WorkItemIDX : nullptr, 132 &AMDGPU::VGPR_32RegClass); 133 case AMDGPUFunctionArgInfo::WORKITEM_ID_Y: 134 return std::make_pair(WorkItemIDY ? &WorkItemIDY : nullptr, 135 &AMDGPU::VGPR_32RegClass); 136 case AMDGPUFunctionArgInfo::WORKITEM_ID_Z: 137 return std::make_pair(WorkItemIDZ ? &WorkItemIDZ : nullptr, 138 &AMDGPU::VGPR_32RegClass); 139 } 140 llvm_unreachable("unexpected preloaded value type"); 141 } 142 143 constexpr AMDGPUFunctionArgInfo AMDGPUFunctionArgInfo::fixedABILayout() { 144 AMDGPUFunctionArgInfo AI; 145 AI.PrivateSegmentBuffer = AMDGPU::SGPR0_SGPR1_SGPR2_SGPR3; 146 AI.DispatchPtr = AMDGPU::SGPR4_SGPR5; 147 AI.QueuePtr = AMDGPU::SGPR6_SGPR7; 148 149 // Do not pass kernarg segment pointer, only pass increment version in its 150 // place. 151 AI.ImplicitArgPtr = AMDGPU::SGPR8_SGPR9; 152 AI.DispatchID = AMDGPU::SGPR10_SGPR11; 153 154 // Skip FlatScratchInit/PrivateSegmentSize 155 AI.WorkGroupIDX = AMDGPU::SGPR12; 156 AI.WorkGroupIDY = AMDGPU::SGPR13; 157 AI.WorkGroupIDZ = AMDGPU::SGPR14; 158 159 const unsigned Mask = 0x3ff; 160 AI.WorkItemIDX = ArgDescriptor::createRegister(AMDGPU::VGPR31, Mask); 161 AI.WorkItemIDY = ArgDescriptor::createRegister(AMDGPU::VGPR31, Mask << 10); 162 AI.WorkItemIDZ = ArgDescriptor::createRegister(AMDGPU::VGPR31, Mask << 20); 163 return AI; 164 } 165 166 const AMDGPUFunctionArgInfo & 167 AMDGPUArgumentUsageInfo::lookupFuncArgInfo(const Function &F) const { 168 auto I = ArgInfoMap.find(&F); 169 if (I == ArgInfoMap.end()) { 170 if (AMDGPUTargetMachine::EnableFixedFunctionABI) 171 return FixedABIFunctionInfo; 172 173 // Without the fixed ABI, we assume no function has special inputs. 174 assert(F.isDeclaration()); 175 return ExternFunctionInfo; 176 } 177 178 return I->second; 179 } 180