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https://github.com/c64scene-ar/llvm-6502.git
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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
134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
//===---- Delinearization.cpp - MultiDimensional Index Delinearization ----===//
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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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// 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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#define DL_NAME "delinearize"
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#define DEBUG_TYPE DL_NAME
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#include "llvm/IR/Constants.h"
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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/DerivedTypes.h"
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#include "llvm/IR/Function.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/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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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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virtual bool runOnFunction(Function &F);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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virtual void print(raw_ostream &O, const Module *M = 0) const;
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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<LoopInfo>();
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AU.addRequired<ScalarEvolution>();
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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<ScalarEvolution>();
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LI = &getAnalysis<LoopInfo>();
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return false;
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}
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static Value *getPointerOperand(Instruction &Inst) {
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if (LoadInst *Load = dyn_cast<LoadInst>(&Inst))
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return Load->getPointerOperand();
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else if (StoreInst *Store = dyn_cast<StoreInst>(&Inst))
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return Store->getPointerOperand();
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else if (GetElementPtrInst *Gep = dyn_cast<GetElementPtrInst>(&Inst))
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return Gep->getPointerOperand();
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return NULL;
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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 != NULL; L = L->getParentLoop()) {
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const SCEV *AccessFn = SE->getSCEVAtScope(getPointerOperand(*Inst), L);
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const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(AccessFn);
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// Do not try to delinearize memory accesses that are not AddRecs.
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if (!AR)
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break;
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O << "AddRec: " << *AR << "\n";
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SmallVector<const SCEV *, 3> Subscripts, Sizes;
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const SCEV *Res = AR->delinearize(*SE, Subscripts, Sizes);
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int Size = Subscripts.size();
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if (Res == AR || Size == 0) {
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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: " << *Res << "\n";
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O << "ArrayDecl[UnknownSize]";
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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(LoopInfo)
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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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