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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
130 lines
4.5 KiB
C++
130 lines
4.5 KiB
C++
//===---- Delinearization.cpp - MultiDimensional Index Delinearization ----===//
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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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// This implements an analysis pass that tries to delinearize all GEP
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// instructions in all loops using the SCEV analysis functionality. This pass is
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// only used for testing purposes: if your pass needs delinearization, please
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// use the on-demand SCEVAddRecExpr::delinearize() function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/ScalarEvolutionExpressions.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/Function.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DL_NAME "delinearize"
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#define DEBUG_TYPE DL_NAME
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namespace {
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class Delinearization : public FunctionPass {
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Delinearization(const Delinearization &); // do not implement
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protected:
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Function *F;
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LoopInfo *LI;
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ScalarEvolution *SE;
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public:
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static char ID; // Pass identification, replacement for typeid
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Delinearization() : FunctionPass(ID) {
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initializeDelinearizationPass(*PassRegistry::getPassRegistry());
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}
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bool runOnFunction(Function &F) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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void print(raw_ostream &O, const Module *M = nullptr) const override;
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};
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} // end anonymous namespace
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void Delinearization::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<LoopInfoWrapperPass>();
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AU.addRequired<ScalarEvolutionWrapperPass>();
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}
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bool Delinearization::runOnFunction(Function &F) {
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this->F = &F;
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SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
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LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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return false;
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}
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void Delinearization::print(raw_ostream &O, const Module *) const {
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O << "Delinearization on function " << F->getName() << ":\n";
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for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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Instruction *Inst = &(*I);
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// Only analyze loads and stores.
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if (!isa<StoreInst>(Inst) && !isa<LoadInst>(Inst) &&
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!isa<GetElementPtrInst>(Inst))
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continue;
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const BasicBlock *BB = Inst->getParent();
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// Delinearize the memory access as analyzed in all the surrounding loops.
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// Do not analyze memory accesses outside loops.
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for (Loop *L = LI->getLoopFor(BB); L != nullptr; L = L->getParentLoop()) {
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const SCEV *AccessFn = SE->getSCEVAtScope(getPointerOperand(Inst), L);
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const SCEVUnknown *BasePointer =
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dyn_cast<SCEVUnknown>(SE->getPointerBase(AccessFn));
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// Do not delinearize if we cannot find the base pointer.
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if (!BasePointer)
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break;
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AccessFn = SE->getMinusSCEV(AccessFn, BasePointer);
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O << "\n";
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O << "Inst:" << *Inst << "\n";
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O << "In Loop with Header: " << L->getHeader()->getName() << "\n";
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O << "AccessFunction: " << *AccessFn << "\n";
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SmallVector<const SCEV *, 3> Subscripts, Sizes;
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SE->delinearize(AccessFn, Subscripts, Sizes, SE->getElementSize(Inst));
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if (Subscripts.size() == 0 || Sizes.size() == 0 ||
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Subscripts.size() != Sizes.size()) {
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O << "failed to delinearize\n";
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continue;
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}
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O << "Base offset: " << *BasePointer << "\n";
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O << "ArrayDecl[UnknownSize]";
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int Size = Subscripts.size();
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for (int i = 0; i < Size - 1; i++)
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O << "[" << *Sizes[i] << "]";
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O << " with elements of " << *Sizes[Size - 1] << " bytes.\n";
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O << "ArrayRef";
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for (int i = 0; i < Size; i++)
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O << "[" << *Subscripts[i] << "]";
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O << "\n";
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}
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}
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}
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char Delinearization::ID = 0;
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static const char delinearization_name[] = "Delinearization";
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INITIALIZE_PASS_BEGIN(Delinearization, DL_NAME, delinearization_name, true,
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true)
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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INITIALIZE_PASS_END(Delinearization, DL_NAME, delinearization_name, true, true)
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FunctionPass *llvm::createDelinearizationPass() { return new Delinearization; }
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