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234 lines
8.1 KiB
C++
234 lines
8.1 KiB
C++
//===-- XCoreLowerThreadLocal - Lower thread local variables --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file contains a pass that lowers thread local variables on the
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/// XCore.
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///
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//===----------------------------------------------------------------------===//
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#include "XCore.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/GlobalVariable.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/NoFolder.h"
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#include "llvm/IR/ValueHandle.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#define DEBUG_TYPE "xcore-lower-thread-local"
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using namespace llvm;
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static cl::opt<unsigned> MaxThreads(
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"xcore-max-threads", cl::Optional,
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cl::desc("Maximum number of threads (for emulation thread-local storage)"),
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cl::Hidden, cl::value_desc("number"), cl::init(8));
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namespace {
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/// Lowers thread local variables on the XCore. Each thread local variable is
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/// expanded to an array of n elements indexed by the thread ID where n is the
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/// fixed number hardware threads supported by the device.
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struct XCoreLowerThreadLocal : public ModulePass {
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static char ID;
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XCoreLowerThreadLocal() : ModulePass(ID) {
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initializeXCoreLowerThreadLocalPass(*PassRegistry::getPassRegistry());
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}
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bool lowerGlobal(GlobalVariable *GV);
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bool runOnModule(Module &M) override;
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};
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}
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char XCoreLowerThreadLocal::ID = 0;
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INITIALIZE_PASS(XCoreLowerThreadLocal, "xcore-lower-thread-local",
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"Lower thread local variables", false, false)
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ModulePass *llvm::createXCoreLowerThreadLocalPass() {
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return new XCoreLowerThreadLocal();
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}
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static ArrayType *createLoweredType(Type *OriginalType) {
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return ArrayType::get(OriginalType, MaxThreads);
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}
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static Constant *
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createLoweredInitializer(ArrayType *NewType, Constant *OriginalInitializer) {
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SmallVector<Constant *, 8> Elements(MaxThreads);
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for (unsigned i = 0; i != MaxThreads; ++i) {
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Elements[i] = OriginalInitializer;
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}
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return ConstantArray::get(NewType, Elements);
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}
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static Instruction *
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createReplacementInstr(ConstantExpr *CE, Instruction *Instr) {
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IRBuilder<NoFolder> Builder(Instr);
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unsigned OpCode = CE->getOpcode();
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switch (OpCode) {
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case Instruction::GetElementPtr: {
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SmallVector<Value *,4> CEOpVec(CE->op_begin(), CE->op_end());
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ArrayRef<Value *> CEOps(CEOpVec);
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return dyn_cast<Instruction>(Builder.CreateInBoundsGEP(
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cast<GEPOperator>(CE)->getSourceElementType(), CEOps[0],
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CEOps.slice(1)));
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}
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case Instruction::Add:
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case Instruction::Sub:
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case Instruction::Mul:
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case Instruction::UDiv:
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case Instruction::SDiv:
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case Instruction::FDiv:
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case Instruction::URem:
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case Instruction::SRem:
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case Instruction::FRem:
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case Instruction::Shl:
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case Instruction::LShr:
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case Instruction::AShr:
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor:
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return dyn_cast<Instruction>(
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Builder.CreateBinOp((Instruction::BinaryOps)OpCode,
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CE->getOperand(0), CE->getOperand(1),
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CE->getName()));
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case Instruction::Trunc:
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case Instruction::ZExt:
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case Instruction::SExt:
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case Instruction::FPToUI:
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case Instruction::FPToSI:
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case Instruction::UIToFP:
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case Instruction::SIToFP:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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case Instruction::PtrToInt:
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case Instruction::IntToPtr:
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case Instruction::BitCast:
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return dyn_cast<Instruction>(
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Builder.CreateCast((Instruction::CastOps)OpCode,
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CE->getOperand(0), CE->getType(),
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CE->getName()));
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default:
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llvm_unreachable("Unhandled constant expression!\n");
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}
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}
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static bool replaceConstantExprOp(ConstantExpr *CE, Pass *P) {
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do {
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SmallVector<WeakTrackingVH, 8> WUsers(CE->user_begin(), CE->user_end());
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llvm::sort(WUsers);
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WUsers.erase(std::unique(WUsers.begin(), WUsers.end()), WUsers.end());
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while (!WUsers.empty())
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if (WeakTrackingVH WU = WUsers.pop_back_val()) {
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if (PHINode *PN = dyn_cast<PHINode>(WU)) {
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for (int I = 0, E = PN->getNumIncomingValues(); I < E; ++I)
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if (PN->getIncomingValue(I) == CE) {
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BasicBlock *PredBB = PN->getIncomingBlock(I);
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if (PredBB->getTerminator()->getNumSuccessors() > 1)
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PredBB = SplitEdge(PredBB, PN->getParent());
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Instruction *InsertPos = PredBB->getTerminator();
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Instruction *NewInst = createReplacementInstr(CE, InsertPos);
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PN->setOperand(I, NewInst);
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}
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} else if (Instruction *Instr = dyn_cast<Instruction>(WU)) {
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Instruction *NewInst = createReplacementInstr(CE, Instr);
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Instr->replaceUsesOfWith(CE, NewInst);
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} else {
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ConstantExpr *CExpr = dyn_cast<ConstantExpr>(WU);
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if (!CExpr || !replaceConstantExprOp(CExpr, P))
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return false;
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}
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}
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} while (CE->hasNUsesOrMore(1)); // We need to check because a recursive
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// sibling may have used 'CE' when createReplacementInstr was called.
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CE->destroyConstant();
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return true;
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}
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static bool rewriteNonInstructionUses(GlobalVariable *GV, Pass *P) {
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SmallVector<WeakTrackingVH, 8> WUsers;
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for (User *U : GV->users())
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if (!isa<Instruction>(U))
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WUsers.push_back(WeakTrackingVH(U));
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while (!WUsers.empty())
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if (WeakTrackingVH WU = WUsers.pop_back_val()) {
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ConstantExpr *CE = dyn_cast<ConstantExpr>(WU);
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if (!CE || !replaceConstantExprOp(CE, P))
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return false;
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}
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return true;
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}
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static bool isZeroLengthArray(Type *Ty) {
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ArrayType *AT = dyn_cast<ArrayType>(Ty);
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return AT && (AT->getNumElements() == 0);
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}
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bool XCoreLowerThreadLocal::lowerGlobal(GlobalVariable *GV) {
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Module *M = GV->getParent();
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if (!GV->isThreadLocal())
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return false;
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// Skip globals that we can't lower and leave it for the backend to error.
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if (!rewriteNonInstructionUses(GV, this) ||
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!GV->getType()->isSized() || isZeroLengthArray(GV->getType()))
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return false;
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// Create replacement global.
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ArrayType *NewType = createLoweredType(GV->getValueType());
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Constant *NewInitializer = nullptr;
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if (GV->hasInitializer())
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NewInitializer = createLoweredInitializer(NewType,
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GV->getInitializer());
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GlobalVariable *NewGV =
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new GlobalVariable(*M, NewType, GV->isConstant(), GV->getLinkage(),
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NewInitializer, "", nullptr,
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GlobalVariable::NotThreadLocal,
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GV->getType()->getAddressSpace(),
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GV->isExternallyInitialized());
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// Update uses.
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SmallVector<User *, 16> Users(GV->user_begin(), GV->user_end());
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for (unsigned I = 0, E = Users.size(); I != E; ++I) {
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User *U = Users[I];
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Instruction *Inst = cast<Instruction>(U);
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IRBuilder<> Builder(Inst);
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Function *GetID = Intrinsic::getDeclaration(GV->getParent(),
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Intrinsic::xcore_getid);
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Value *ThreadID = Builder.CreateCall(GetID, {});
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Value *Addr = Builder.CreateInBoundsGEP(NewGV->getValueType(), NewGV,
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{Builder.getInt64(0), ThreadID});
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U->replaceUsesOfWith(GV, Addr);
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}
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// Remove old global.
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NewGV->takeName(GV);
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GV->eraseFromParent();
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return true;
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}
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bool XCoreLowerThreadLocal::runOnModule(Module &M) {
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// Find thread local globals.
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bool MadeChange = false;
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SmallVector<GlobalVariable *, 16> ThreadLocalGlobals;
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for (GlobalVariable &GV : M.globals())
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if (GV.isThreadLocal())
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ThreadLocalGlobals.push_back(&GV);
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for (unsigned I = 0, E = ThreadLocalGlobals.size(); I != E; ++I) {
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MadeChange |= lowerGlobal(ThreadLocalGlobals[I]);
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}
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return MadeChange;
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}
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