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//===-- GenericToNVVM.cpp - Convert generic module to NVVM module - C++ -*-===//
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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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//
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// Convert generic global variables into either .global or .const access based
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// on the variable's "constant" qualifier.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/NVPTXBaseInfo.h"
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#include "NVPTX.h"
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#include "NVPTXUtilities.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Operator.h"
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#include "llvm/IR/ValueMap.h"
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#include "llvm/Transforms/Utils/ValueMapper.h"
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using namespace llvm;
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namespace llvm {
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void initializeGenericToNVVMPass(PassRegistry &);
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}
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namespace {
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class GenericToNVVM : public ModulePass {
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public:
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static char ID;
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GenericToNVVM() : ModulePass(ID) {}
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bool runOnModule(Module &M) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override {}
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private:
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Value *getOrInsertCVTA(Module *M, Function *F, GlobalVariable *GV,
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IRBuilder<> &Builder);
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Value *remapConstant(Module *M, Function *F, Constant *C,
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IRBuilder<> &Builder);
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Value *remapConstantVectorOrConstantAggregate(Module *M, Function *F,
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Constant *C,
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IRBuilder<> &Builder);
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Value *remapConstantExpr(Module *M, Function *F, ConstantExpr *C,
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IRBuilder<> &Builder);
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typedef ValueMap<GlobalVariable *, GlobalVariable *> GVMapTy;
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typedef ValueMap<Constant *, Value *> ConstantToValueMapTy;
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GVMapTy GVMap;
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ConstantToValueMapTy ConstantToValueMap;
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};
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} // end namespace
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char GenericToNVVM::ID = 0;
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ModulePass *llvm::createGenericToNVVMPass() { return new GenericToNVVM(); }
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INITIALIZE_PASS(
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GenericToNVVM, "generic-to-nvvm",
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"Ensure that the global variables are in the global address space", false,
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false)
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bool GenericToNVVM::runOnModule(Module &M) {
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// Create a clone of each global variable that has the default address space.
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// The clone is created with the global address space specifier, and the pair
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// of original global variable and its clone is placed in the GVMap for later
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// use.
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E;) {
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GlobalVariable *GV = &*I++;
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if (GV->getType()->getAddressSpace() == llvm::ADDRESS_SPACE_GENERIC &&
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!llvm::isTexture(*GV) && !llvm::isSurface(*GV) &&
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!llvm::isSampler(*GV) && !GV->getName().startswith("llvm.")) {
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GlobalVariable *NewGV = new GlobalVariable(
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M, GV->getValueType(), GV->isConstant(),
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GV->getLinkage(),
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GV->hasInitializer() ? GV->getInitializer() : nullptr,
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"", GV, GV->getThreadLocalMode(), llvm::ADDRESS_SPACE_GLOBAL);
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NewGV->copyAttributesFrom(GV);
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GVMap[GV] = NewGV;
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}
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}
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// Return immediately, if every global variable has a specific address space
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// specifier.
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if (GVMap.empty()) {
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return false;
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}
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// Walk through the instructions in function defitinions, and replace any use
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// of original global variables in GVMap with a use of the corresponding
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// copies in GVMap. If necessary, promote constants to instructions.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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if (I->isDeclaration()) {
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continue;
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}
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IRBuilder<> Builder(I->getEntryBlock().getFirstNonPHIOrDbg());
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for (Function::iterator BBI = I->begin(), BBE = I->end(); BBI != BBE;
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++BBI) {
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for (BasicBlock::iterator II = BBI->begin(), IE = BBI->end(); II != IE;
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++II) {
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for (unsigned i = 0, e = II->getNumOperands(); i < e; ++i) {
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Value *Operand = II->getOperand(i);
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if (isa<Constant>(Operand)) {
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II->setOperand(
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i, remapConstant(&M, &*I, cast<Constant>(Operand), Builder));
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}
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}
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}
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}
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ConstantToValueMap.clear();
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}
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// Copy GVMap over to a standard value map.
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ValueToValueMapTy VM;
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for (auto I = GVMap.begin(), E = GVMap.end(); I != E; ++I)
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VM[I->first] = I->second;
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// Walk through the global variable initializers, and replace any use of
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// original global variables in GVMap with a use of the corresponding copies
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// in GVMap. The copies need to be bitcast to the original global variable
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// types, as we cannot use cvta in global variable initializers.
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for (GVMapTy::iterator I = GVMap.begin(), E = GVMap.end(); I != E;) {
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GlobalVariable *GV = I->first;
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GlobalVariable *NewGV = I->second;
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// Remove GV from the map so that it can be RAUWed. Note that
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// DenseMap::erase() won't invalidate any iterators but this one.
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auto Next = std::next(I);
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GVMap.erase(I);
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I = Next;
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Constant *BitCastNewGV = ConstantExpr::getPointerCast(NewGV, GV->getType());
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// At this point, the remaining uses of GV should be found only in global
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// variable initializers, as other uses have been already been removed
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// while walking through the instructions in function definitions.
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GV->replaceAllUsesWith(BitCastNewGV);
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std::string Name = GV->getName();
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GV->eraseFromParent();
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NewGV->setName(Name);
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}
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assert(GVMap.empty() && "Expected it to be empty by now");
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return true;
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}
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Value *GenericToNVVM::getOrInsertCVTA(Module *M, Function *F,
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GlobalVariable *GV,
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IRBuilder<> &Builder) {
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PointerType *GVType = GV->getType();
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Value *CVTA = nullptr;
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// See if the address space conversion requires the operand to be bitcast
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// to i8 addrspace(n)* first.
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EVT ExtendedGVType = EVT::getEVT(GV->getValueType(), true);
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if (!ExtendedGVType.isInteger() && !ExtendedGVType.isFloatingPoint()) {
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// A bitcast to i8 addrspace(n)* on the operand is needed.
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LLVMContext &Context = M->getContext();
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unsigned int AddrSpace = GVType->getAddressSpace();
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Type *DestTy = PointerType::get(Type::getInt8Ty(Context), AddrSpace);
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CVTA = Builder.CreateBitCast(GV, DestTy, "cvta");
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// Insert the address space conversion.
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Type *ResultType =
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PointerType::get(Type::getInt8Ty(Context), llvm::ADDRESS_SPACE_GENERIC);
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Function *CVTAFunction = Intrinsic::getDeclaration(
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M, Intrinsic::nvvm_ptr_global_to_gen, {ResultType, DestTy});
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CVTA = Builder.CreateCall(CVTAFunction, CVTA, "cvta");
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// Another bitcast from i8 * to <the element type of GVType> * is
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// required.
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DestTy =
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PointerType::get(GV->getValueType(), llvm::ADDRESS_SPACE_GENERIC);
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CVTA = Builder.CreateBitCast(CVTA, DestTy, "cvta");
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} else {
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// A simple CVTA is enough.
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SmallVector<Type *, 2> ParamTypes;
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ParamTypes.push_back(PointerType::get(GV->getValueType(),
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llvm::ADDRESS_SPACE_GENERIC));
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ParamTypes.push_back(GVType);
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Function *CVTAFunction = Intrinsic::getDeclaration(
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M, Intrinsic::nvvm_ptr_global_to_gen, ParamTypes);
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CVTA = Builder.CreateCall(CVTAFunction, GV, "cvta");
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}
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return CVTA;
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}
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Value *GenericToNVVM::remapConstant(Module *M, Function *F, Constant *C,
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IRBuilder<> &Builder) {
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// If the constant C has been converted already in the given function F, just
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// return the converted value.
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ConstantToValueMapTy::iterator CTII = ConstantToValueMap.find(C);
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if (CTII != ConstantToValueMap.end()) {
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return CTII->second;
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}
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Value *NewValue = C;
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if (isa<GlobalVariable>(C)) {
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// If the constant C is a global variable and is found in GVMap, generate a
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// set set of instructions that convert the clone of C with the global
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// address space specifier to a generic pointer.
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// The constant C cannot be used here, as it will be erased from the
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// module eventually. And the clone of C with the global address space
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// specifier cannot be used here either, as it will affect the types of
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// other instructions in the function. Hence, this address space conversion
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// is required.
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GVMapTy::iterator I = GVMap.find(cast<GlobalVariable>(C));
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if (I != GVMap.end()) {
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NewValue = getOrInsertCVTA(M, F, I->second, Builder);
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}
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} else if (isa<ConstantAggregate>(C)) {
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// If any element in the constant vector or aggregate C is or uses a global
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// variable in GVMap, the constant C needs to be reconstructed, using a set
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// of instructions.
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NewValue = remapConstantVectorOrConstantAggregate(M, F, C, Builder);
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} else if (isa<ConstantExpr>(C)) {
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// If any operand in the constant expression C is or uses a global variable
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// in GVMap, the constant expression C needs to be reconstructed, using a
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// set of instructions.
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NewValue = remapConstantExpr(M, F, cast<ConstantExpr>(C), Builder);
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}
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ConstantToValueMap[C] = NewValue;
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return NewValue;
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}
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Value *GenericToNVVM::remapConstantVectorOrConstantAggregate(
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Module *M, Function *F, Constant *C, IRBuilder<> &Builder) {
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bool OperandChanged = false;
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SmallVector<Value *, 4> NewOperands;
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unsigned NumOperands = C->getNumOperands();
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// Check if any element is or uses a global variable in GVMap, and thus
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// converted to another value.
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for (unsigned i = 0; i < NumOperands; ++i) {
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Value *Operand = C->getOperand(i);
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Value *NewOperand = remapConstant(M, F, cast<Constant>(Operand), Builder);
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OperandChanged |= Operand != NewOperand;
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NewOperands.push_back(NewOperand);
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}
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// If none of the elements has been modified, return C as it is.
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if (!OperandChanged) {
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return C;
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}
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// If any of the elements has been modified, construct the equivalent
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// vector or aggregate value with a set instructions and the converted
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// elements.
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Value *NewValue = UndefValue::get(C->getType());
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if (isa<ConstantVector>(C)) {
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for (unsigned i = 0; i < NumOperands; ++i) {
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Value *Idx = ConstantInt::get(Type::getInt32Ty(M->getContext()), i);
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NewValue = Builder.CreateInsertElement(NewValue, NewOperands[i], Idx);
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}
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} else {
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for (unsigned i = 0; i < NumOperands; ++i) {
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NewValue =
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Builder.CreateInsertValue(NewValue, NewOperands[i], makeArrayRef(i));
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}
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}
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return NewValue;
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}
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Value *GenericToNVVM::remapConstantExpr(Module *M, Function *F, ConstantExpr *C,
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IRBuilder<> &Builder) {
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bool OperandChanged = false;
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SmallVector<Value *, 4> NewOperands;
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unsigned NumOperands = C->getNumOperands();
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// Check if any operand is or uses a global variable in GVMap, and thus
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// converted to another value.
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for (unsigned i = 0; i < NumOperands; ++i) {
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Value *Operand = C->getOperand(i);
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Value *NewOperand = remapConstant(M, F, cast<Constant>(Operand), Builder);
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OperandChanged |= Operand != NewOperand;
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NewOperands.push_back(NewOperand);
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}
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// If none of the operands has been modified, return C as it is.
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if (!OperandChanged) {
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return C;
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}
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// If any of the operands has been modified, construct the instruction with
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// the converted operands.
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unsigned Opcode = C->getOpcode();
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switch (Opcode) {
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case Instruction::ICmp:
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// CompareConstantExpr (icmp)
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return Builder.CreateICmp(CmpInst::Predicate(C->getPredicate()),
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NewOperands[0], NewOperands[1]);
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case Instruction::FCmp:
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// CompareConstantExpr (fcmp)
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llvm_unreachable("Address space conversion should have no effect "
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"on float point CompareConstantExpr (fcmp)!");
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case Instruction::ExtractElement:
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// ExtractElementConstantExpr
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return Builder.CreateExtractElement(NewOperands[0], NewOperands[1]);
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case Instruction::InsertElement:
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// InsertElementConstantExpr
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return Builder.CreateInsertElement(NewOperands[0], NewOperands[1],
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NewOperands[2]);
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case Instruction::ShuffleVector:
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// ShuffleVector
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return Builder.CreateShuffleVector(NewOperands[0], NewOperands[1],
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NewOperands[2]);
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case Instruction::ExtractValue:
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// ExtractValueConstantExpr
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return Builder.CreateExtractValue(NewOperands[0], C->getIndices());
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case Instruction::InsertValue:
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// InsertValueConstantExpr
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return Builder.CreateInsertValue(NewOperands[0], NewOperands[1],
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C->getIndices());
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case Instruction::GetElementPtr:
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// GetElementPtrConstantExpr
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return cast<GEPOperator>(C)->isInBounds()
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? Builder.CreateGEP(
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cast<GEPOperator>(C)->getSourceElementType(),
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NewOperands[0],
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makeArrayRef(&NewOperands[1], NumOperands - 1))
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: Builder.CreateInBoundsGEP(
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cast<GEPOperator>(C)->getSourceElementType(),
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NewOperands[0],
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makeArrayRef(&NewOperands[1], NumOperands - 1));
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case Instruction::Select:
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// SelectConstantExpr
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return Builder.CreateSelect(NewOperands[0], NewOperands[1], NewOperands[2]);
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default:
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// BinaryConstantExpr
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if (Instruction::isBinaryOp(Opcode)) {
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return Builder.CreateBinOp(Instruction::BinaryOps(C->getOpcode()),
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NewOperands[0], NewOperands[1]);
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}
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// UnaryConstantExpr
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if (Instruction::isCast(Opcode)) {
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return Builder.CreateCast(Instruction::CastOps(C->getOpcode()),
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NewOperands[0], C->getType());
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}
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llvm_unreachable("GenericToNVVM encountered an unsupported ConstantExpr");
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}
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}
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