| File: | llvm/lib/Target/NVPTX/NVPTXLowerAlloca.cpp |
| Warning: | line 74, column 20 Called C++ object pointer is null |
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| 1 | //===-- NVPTXLowerAlloca.cpp - Make alloca to use local memory =====--===// | |||
| 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 | // For all alloca instructions, and add a pair of cast to local address for | |||
| 10 | // each of them. For example, | |||
| 11 | // | |||
| 12 | // %A = alloca i32 | |||
| 13 | // store i32 0, i32* %A ; emits st.u32 | |||
| 14 | // | |||
| 15 | // will be transformed to | |||
| 16 | // | |||
| 17 | // %A = alloca i32 | |||
| 18 | // %Local = addrspacecast i32* %A to i32 addrspace(5)* | |||
| 19 | // %Generic = addrspacecast i32 addrspace(5)* %A to i32* | |||
| 20 | // store i32 0, i32 addrspace(5)* %Generic ; emits st.local.u32 | |||
| 21 | // | |||
| 22 | // And we will rely on NVPTXInferAddressSpaces to combine the last two | |||
| 23 | // instructions. | |||
| 24 | // | |||
| 25 | //===----------------------------------------------------------------------===// | |||
| 26 | ||||
| 27 | #include "NVPTX.h" | |||
| 28 | #include "NVPTXUtilities.h" | |||
| 29 | #include "MCTargetDesc/NVPTXBaseInfo.h" | |||
| 30 | #include "llvm/IR/Function.h" | |||
| 31 | #include "llvm/IR/Instructions.h" | |||
| 32 | #include "llvm/IR/IntrinsicInst.h" | |||
| 33 | #include "llvm/IR/Module.h" | |||
| 34 | #include "llvm/IR/Type.h" | |||
| 35 | #include "llvm/Pass.h" | |||
| 36 | ||||
| 37 | using namespace llvm; | |||
| 38 | ||||
| 39 | namespace llvm { | |||
| 40 | void initializeNVPTXLowerAllocaPass(PassRegistry &); | |||
| 41 | } | |||
| 42 | ||||
| 43 | namespace { | |||
| 44 | class NVPTXLowerAlloca : public FunctionPass { | |||
| 45 | bool runOnFunction(Function &F) override; | |||
| 46 | ||||
| 47 | public: | |||
| 48 | static char ID; // Pass identification, replacement for typeid | |||
| 49 | NVPTXLowerAlloca() : FunctionPass(ID) {} | |||
| 50 | StringRef getPassName() const override { | |||
| 51 | return "convert address space of alloca'ed memory to local"; | |||
| 52 | } | |||
| 53 | }; | |||
| 54 | } // namespace | |||
| 55 | ||||
| 56 | char NVPTXLowerAlloca::ID = 1; | |||
| 57 | ||||
| 58 | INITIALIZE_PASS(NVPTXLowerAlloca, "nvptx-lower-alloca",static void *initializeNVPTXLowerAllocaPassOnce(PassRegistry & Registry) { PassInfo *PI = new PassInfo( "Lower Alloca", "nvptx-lower-alloca" , &NVPTXLowerAlloca::ID, PassInfo::NormalCtor_t(callDefaultCtor <NVPTXLowerAlloca>), false, false); Registry.registerPass (*PI, true); return PI; } static llvm::once_flag InitializeNVPTXLowerAllocaPassFlag ; void llvm::initializeNVPTXLowerAllocaPass(PassRegistry & Registry) { llvm::call_once(InitializeNVPTXLowerAllocaPassFlag , initializeNVPTXLowerAllocaPassOnce, std::ref(Registry)); } | |||
| 59 | "Lower Alloca", false, false)static void *initializeNVPTXLowerAllocaPassOnce(PassRegistry & Registry) { PassInfo *PI = new PassInfo( "Lower Alloca", "nvptx-lower-alloca" , &NVPTXLowerAlloca::ID, PassInfo::NormalCtor_t(callDefaultCtor <NVPTXLowerAlloca>), false, false); Registry.registerPass (*PI, true); return PI; } static llvm::once_flag InitializeNVPTXLowerAllocaPassFlag ; void llvm::initializeNVPTXLowerAllocaPass(PassRegistry & Registry) { llvm::call_once(InitializeNVPTXLowerAllocaPassFlag , initializeNVPTXLowerAllocaPassOnce, std::ref(Registry)); } | |||
| 60 | ||||
| 61 | // ============================================================================= | |||
| 62 | // Main function for this pass. | |||
| 63 | // ============================================================================= | |||
| 64 | bool NVPTXLowerAlloca::runOnFunction(Function &F) { | |||
| 65 | if (skipFunction(F)) | |||
| ||||
| 66 | return false; | |||
| 67 | ||||
| 68 | bool Changed = false; | |||
| 69 | for (auto &BB : F) | |||
| 70 | for (auto &I : BB) { | |||
| 71 | if (auto allocaInst
| |||
| 72 | Changed = true; | |||
| 73 | auto PTy = dyn_cast<PointerType>(allocaInst->getType()); | |||
| 74 | auto ETy = PTy->getElementType(); | |||
| ||||
| 75 | auto LocalAddrTy = PointerType::get(ETy, ADDRESS_SPACE_LOCAL); | |||
| 76 | auto NewASCToLocal = new AddrSpaceCastInst(allocaInst, LocalAddrTy, ""); | |||
| 77 | auto GenericAddrTy = PointerType::get(ETy, ADDRESS_SPACE_GENERIC); | |||
| 78 | auto NewASCToGeneric = | |||
| 79 | new AddrSpaceCastInst(NewASCToLocal, GenericAddrTy, ""); | |||
| 80 | NewASCToLocal->insertAfter(allocaInst); | |||
| 81 | NewASCToGeneric->insertAfter(NewASCToLocal); | |||
| 82 | for (Value::use_iterator UI = allocaInst->use_begin(), | |||
| 83 | UE = allocaInst->use_end(); | |||
| 84 | UI != UE;) { | |||
| 85 | // Check Load, Store, GEP, and BitCast Uses on alloca and make them | |||
| 86 | // use the converted generic address, in order to expose non-generic | |||
| 87 | // addrspacecast to NVPTXInferAddressSpaces. For other types | |||
| 88 | // of instructions this is unnecessary and may introduce redundant | |||
| 89 | // address cast. | |||
| 90 | const auto &AllocaUse = *UI++; | |||
| 91 | auto LI = dyn_cast<LoadInst>(AllocaUse.getUser()); | |||
| 92 | if (LI && LI->getPointerOperand() == allocaInst && | |||
| 93 | !LI->isVolatile()) { | |||
| 94 | LI->setOperand(LI->getPointerOperandIndex(), NewASCToGeneric); | |||
| 95 | continue; | |||
| 96 | } | |||
| 97 | auto SI = dyn_cast<StoreInst>(AllocaUse.getUser()); | |||
| 98 | if (SI && SI->getPointerOperand() == allocaInst && | |||
| 99 | !SI->isVolatile()) { | |||
| 100 | SI->setOperand(SI->getPointerOperandIndex(), NewASCToGeneric); | |||
| 101 | continue; | |||
| 102 | } | |||
| 103 | auto GI = dyn_cast<GetElementPtrInst>(AllocaUse.getUser()); | |||
| 104 | if (GI && GI->getPointerOperand() == allocaInst) { | |||
| 105 | GI->setOperand(GI->getPointerOperandIndex(), NewASCToGeneric); | |||
| 106 | continue; | |||
| 107 | } | |||
| 108 | auto BI = dyn_cast<BitCastInst>(AllocaUse.getUser()); | |||
| 109 | if (BI && BI->getOperand(0) == allocaInst) { | |||
| 110 | BI->setOperand(0, NewASCToGeneric); | |||
| 111 | continue; | |||
| 112 | } | |||
| 113 | } | |||
| 114 | } | |||
| 115 | } | |||
| 116 | return Changed; | |||
| 117 | } | |||
| 118 | ||||
| 119 | FunctionPass *llvm::createNVPTXLowerAllocaPass() { | |||
| 120 | return new NVPTXLowerAlloca(); | |||
| 121 | } |