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974a445bd9
subsequent changes are easier to review. About to fix some layering issues, and wanted to separate out the necessary churn. Also comment and sink the include of "Windows.h" in three .inc files to match the usage in Memory.inc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198685 91177308-0d34-0410-b5e6-96231b3b80d8
242 lines
8.4 KiB
C++
242 lines
8.4 KiB
C++
//===-- XCoreLowerThreadLocal - Lower thread local variables --------------===//
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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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/// \file
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/// \brief 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/Pass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/NoFolder.h"
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#include "llvm/Support/ValueHandle.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);
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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<true,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(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<WeakVH,8> WUsers;
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for (Value::use_iterator I = CE->use_begin(), E = CE->use_end();
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I != E; ++I)
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WUsers.push_back(WeakVH(*I));
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std::sort(WUsers.begin(), WUsers.end());
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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 (WeakVH 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(), P);
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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 becasue a recursive
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// sibbling 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<WeakVH,8> WUsers;
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for (Value::use_iterator I = GV->use_begin(), E = GV->use_end(); I != E; ++I)
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if (!isa<Instruction>(*I))
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WUsers.push_back(WeakVH(*I));
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while (!WUsers.empty())
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if (WeakVH 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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LLVMContext &Ctx = M->getContext();
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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->getType()->getElementType());
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Constant *NewInitializer = 0;
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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, "", 0, 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->use_begin(), GV->use_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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SmallVector<Value *, 2> Indices;
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Indices.push_back(Constant::getNullValue(Type::getInt64Ty(Ctx)));
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Indices.push_back(ThreadID);
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Value *Addr = Builder.CreateInBoundsGEP(NewGV, Indices);
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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 (Module::global_iterator GVI = M.global_begin(), E = M.global_end();
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GVI != E; ++GVI) {
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GlobalVariable *GV = GVI;
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if (GV->isThreadLocal())
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ThreadLocalGlobals.push_back(GV);
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}
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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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