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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37501 91177308-0d34-0410-b5e6-96231b3b80d8
202 lines
7.1 KiB
C++
202 lines
7.1 KiB
C++
//===- LoopExtractor.cpp - Extract each loop into a new function ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// A pass wrapper around the ExtractLoop() scalar transformation to extract each
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// top-level loop into its own new function. If the loop is the ONLY loop in a
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// given function, it is not touched. This is a pass most useful for debugging
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// via bugpoint.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "loop-extract"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/Dominators.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/FunctionUtils.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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STATISTIC(NumExtracted, "Number of loops extracted");
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namespace {
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// FIXME: This is not a function pass, but the PassManager doesn't allow
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// Module passes to require FunctionPasses, so we can't get loop info if we're
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// not a function pass.
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struct VISIBILITY_HIDDEN LoopExtractor : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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unsigned NumLoops;
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LoopExtractor(unsigned numLoops = ~0)
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: FunctionPass((intptr_t)&ID), NumLoops(numLoops) {}
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virtual bool runOnFunction(Function &F);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredID(BreakCriticalEdgesID);
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AU.addRequiredID(LoopSimplifyID);
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AU.addRequired<DominatorTree>();
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AU.addRequired<LoopInfo>();
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}
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};
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char LoopExtractor::ID = 0;
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RegisterPass<LoopExtractor>
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X("loop-extract", "Extract loops into new functions");
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/// SingleLoopExtractor - For bugpoint.
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struct SingleLoopExtractor : public LoopExtractor {
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static char ID; // Pass identification, replacement for typeid
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SingleLoopExtractor() : LoopExtractor(1) {}
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};
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char SingleLoopExtractor::ID = 0;
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RegisterPass<SingleLoopExtractor>
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Y("loop-extract-single", "Extract at most one loop into a new function");
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} // End anonymous namespace
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// createLoopExtractorPass - This pass extracts all natural loops from the
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// program into a function if it can.
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//
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FunctionPass *llvm::createLoopExtractorPass() { return new LoopExtractor(); }
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bool LoopExtractor::runOnFunction(Function &F) {
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LoopInfo &LI = getAnalysis<LoopInfo>();
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// If this function has no loops, there is nothing to do.
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if (LI.begin() == LI.end())
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return false;
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DominatorTree &DT = getAnalysis<DominatorTree>();
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// If there is more than one top-level loop in this function, extract all of
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// the loops.
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bool Changed = false;
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if (LI.end()-LI.begin() > 1) {
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for (LoopInfo::iterator i = LI.begin(), e = LI.end(); i != e; ++i) {
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if (NumLoops == 0) return Changed;
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--NumLoops;
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Changed |= ExtractLoop(DT, *i) != 0;
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++NumExtracted;
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}
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} else {
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// Otherwise there is exactly one top-level loop. If this function is more
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// than a minimal wrapper around the loop, extract the loop.
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Loop *TLL = *LI.begin();
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bool ShouldExtractLoop = false;
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// Extract the loop if the entry block doesn't branch to the loop header.
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TerminatorInst *EntryTI = F.getEntryBlock().getTerminator();
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if (!isa<BranchInst>(EntryTI) ||
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!cast<BranchInst>(EntryTI)->isUnconditional() ||
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EntryTI->getSuccessor(0) != TLL->getHeader())
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ShouldExtractLoop = true;
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else {
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// Check to see if any exits from the loop are more than just return
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// blocks.
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std::vector<BasicBlock*> ExitBlocks;
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TLL->getExitBlocks(ExitBlocks);
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for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
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if (!isa<ReturnInst>(ExitBlocks[i]->getTerminator())) {
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ShouldExtractLoop = true;
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break;
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}
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}
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if (ShouldExtractLoop) {
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if (NumLoops == 0) return Changed;
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--NumLoops;
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Changed |= ExtractLoop(DT, TLL) != 0;
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++NumExtracted;
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} else {
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// Okay, this function is a minimal container around the specified loop.
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// If we extract the loop, we will continue to just keep extracting it
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// infinitely... so don't extract it. However, if the loop contains any
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// subloops, extract them.
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for (Loop::iterator i = TLL->begin(), e = TLL->end(); i != e; ++i) {
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if (NumLoops == 0) return Changed;
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--NumLoops;
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Changed |= ExtractLoop(DT, *i) != 0;
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++NumExtracted;
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}
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}
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}
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return Changed;
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}
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// createSingleLoopExtractorPass - This pass extracts one natural loop from the
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// program into a function if it can. This is used by bugpoint.
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//
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FunctionPass *llvm::createSingleLoopExtractorPass() {
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return new SingleLoopExtractor();
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}
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namespace {
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/// BlockExtractorPass - This pass is used by bugpoint to extract all blocks
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/// from the module into their own functions except for those specified by the
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/// BlocksToNotExtract list.
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class BlockExtractorPass : public ModulePass {
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std::vector<BasicBlock*> BlocksToNotExtract;
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public:
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static char ID; // Pass identification, replacement for typeid
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BlockExtractorPass(std::vector<BasicBlock*> &B)
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: ModulePass((intptr_t)&ID), BlocksToNotExtract(B) {}
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BlockExtractorPass() : ModulePass((intptr_t)&ID) {}
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bool runOnModule(Module &M);
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};
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char BlockExtractorPass::ID = 0;
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RegisterPass<BlockExtractorPass>
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XX("extract-blocks", "Extract Basic Blocks From Module (for bugpoint use)");
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}
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// createBlockExtractorPass - This pass extracts all blocks (except those
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// specified in the argument list) from the functions in the module.
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//
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ModulePass *llvm::createBlockExtractorPass(std::vector<BasicBlock*> &BTNE) {
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return new BlockExtractorPass(BTNE);
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}
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bool BlockExtractorPass::runOnModule(Module &M) {
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std::set<BasicBlock*> TranslatedBlocksToNotExtract;
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for (unsigned i = 0, e = BlocksToNotExtract.size(); i != e; ++i) {
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BasicBlock *BB = BlocksToNotExtract[i];
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Function *F = BB->getParent();
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// Map the corresponding function in this module.
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Function *MF = M.getFunction(F->getName());
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assert(MF->getFunctionType() == F->getFunctionType() && "Wrong function?");
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// Figure out which index the basic block is in its function.
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Function::iterator BBI = MF->begin();
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std::advance(BBI, std::distance(F->begin(), Function::iterator(BB)));
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TranslatedBlocksToNotExtract.insert(BBI);
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}
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// Now that we know which blocks to not extract, figure out which ones we WANT
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// to extract.
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std::vector<BasicBlock*> BlocksToExtract;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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if (!TranslatedBlocksToNotExtract.count(BB))
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BlocksToExtract.push_back(BB);
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for (unsigned i = 0, e = BlocksToExtract.size(); i != e; ++i)
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ExtractBasicBlock(BlocksToExtract[i]);
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return !BlocksToExtract.empty();
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}
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