RegionInfo.cpp revision 73362c820bad20e545d37b8a2414c35c0d3d583c
1f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser//===- RegionInfo.cpp - SESE region detection analysis --------------------===// 2f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// 3f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// The LLVM Compiler Infrastructure 4f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// 5f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// This file is distributed under the University of Illinois Open Source 6f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// License. See LICENSE.TXT for details. 7f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// 8f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser//===----------------------------------------------------------------------===// 9f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// Detects single entry single exit regions in the control flow graph. 10f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser//===----------------------------------------------------------------------===// 11f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 12f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/Analysis/RegionInfo.h" 13f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/Analysis/RegionIterator.h" 14f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 15f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/ADT/PostOrderIterator.h" 16f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/ADT/Statistic.h" 17f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/Support/CommandLine.h" 18f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/Support/ErrorHandling.h" 19f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/Support/raw_ostream.h" 20082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser#include "llvm/Analysis/LoopInfo.h" 21f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 22f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#define DEBUG_TYPE "region" 23f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include "llvm/Support/Debug.h" 24f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 25f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include <set> 26f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#include <algorithm> 27f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 28f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserusing namespace llvm; 29f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 30f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// Always verify if expensive checking is enabled. 31f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#ifdef XDEBUG 32811edc1f1a0672d28cd7c938e478a92543e68a51Dan Gohmanstatic bool VerifyRegionInfo = true; 33f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#else 34811edc1f1a0672d28cd7c938e478a92543e68a51Dan Gohmanstatic bool VerifyRegionInfo = false; 35f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser#endif 36f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 37f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserstatic cl::opt<bool,true> 38f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserVerifyRegionInfoX("verify-region-info", cl::location(VerifyRegionInfo), 39f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser cl::desc("Verify region info (time consuming)")); 40f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 41f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserSTATISTIC(numRegions, "The # of regions"); 42f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserSTATISTIC(numSimpleRegions, "The # of simple regions"); 43f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 44f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser//===----------------------------------------------------------------------===// 45f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser/// PrintStyle - Print region in difference ways. 46f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserenum PrintStyle { PrintNone, PrintBB, PrintRN }; 47f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 48f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grossercl::opt<enum PrintStyle> printStyle("print-region-style", cl::Hidden, 49f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser cl::desc("style of printing regions"), 50f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser cl::values( 51f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser clEnumValN(PrintNone, "none", "print no details"), 52f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser clEnumValN(PrintBB, "bb", "print regions in detail with block_iterator"), 53f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser clEnumValN(PrintRN, "rn", "print regions in detail with element_iterator"), 54f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser clEnumValEnd)); 55f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser//===----------------------------------------------------------------------===// 56f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser/// Region Implementation 57f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::Region(BasicBlock *Entry, BasicBlock *Exit, RegionInfo* RInfo, 58f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser DominatorTree *dt, Region *Parent) 59f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser : RegionNode(Parent, Entry, 1), RI(RInfo), DT(dt), exit(Exit) {} 60f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 61f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::~Region() { 62329878f4ddd72c6f2d2d6acfa48d7e1447ed88c0Daniel Dunbar // Free the cached nodes. 63329878f4ddd72c6f2d2d6acfa48d7e1447ed88c0Daniel Dunbar for (BBNodeMapT::iterator it = BBNodeMap.begin(), 64329878f4ddd72c6f2d2d6acfa48d7e1447ed88c0Daniel Dunbar ie = BBNodeMap.end(); it != ie; ++it) 65329878f4ddd72c6f2d2d6acfa48d7e1447ed88c0Daniel Dunbar delete it->second; 66329878f4ddd72c6f2d2d6acfa48d7e1447ed88c0Daniel Dunbar 67f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Only clean the cache for this Region. Caches of child Regions will be 68f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // cleaned when the child Regions are deleted. 69f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBNodeMap.clear(); 70f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 71f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (iterator I = begin(), E = end(); I != E; ++I) 72f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser delete *I; 73f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 74f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 75f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserbool Region::contains(const BasicBlock *B) const { 76f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *BB = const_cast<BasicBlock*>(B); 77f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 78f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(DT->getNode(BB) && "BB not part of the dominance tree"); 79f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 80f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *entry = getEntry(), *exit = getExit(); 81f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 82f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Toplevel region. 83f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!exit) 84f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return true; 85f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 86f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return (DT->dominates(entry, BB) 87f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser && !(DT->dominates(exit, BB) && DT->dominates(entry, exit))); 88f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 89f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 90082d587d35a41ee06985d7867b72fb2632962281Tobias Grosserbool Region::contains(const Loop *L) const { 91082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser // BBs that are not part of any loop are element of the Loop 92082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser // described by the NULL pointer. This loop is not part of any region, 93082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser // except if the region describes the whole function. 94082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (L == 0) 95082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return getExit() == 0; 96082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 97082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (!contains(L->getHeader())) 98082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return false; 99082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 100082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser SmallVector<BasicBlock *, 8> ExitingBlocks; 101082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser L->getExitingBlocks(ExitingBlocks); 102082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 103082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser for (SmallVectorImpl<BasicBlock*>::iterator BI = ExitingBlocks.begin(), 104082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser BE = ExitingBlocks.end(); BI != BE; ++BI) 105082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (!contains(*BI)) 106082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return false; 107082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 108082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return true; 109082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser} 110082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 111082d587d35a41ee06985d7867b72fb2632962281Tobias GrosserLoop *Region::outermostLoopInRegion(Loop *L) const { 112082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (!contains(L)) 113082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return 0; 114082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 115082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser while (L && contains(L->getParentLoop())) { 116082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser L = L->getParentLoop(); 117082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser } 118082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 119082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return L; 120082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser} 121082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 122082d587d35a41ee06985d7867b72fb2632962281Tobias GrosserLoop *Region::outermostLoopInRegion(LoopInfo *LI, BasicBlock* BB) const { 123082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser assert(LI && BB && "LI and BB cannot be null!"); 124082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser Loop *L = LI->getLoopFor(BB); 125082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return outermostLoopInRegion(L); 126082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser} 127082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 128f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserbool Region::isSimple() const { 129f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser bool isSimple = true; 130f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser bool found = false; 131f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 132f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *entry = getEntry(), *exit = getExit(); 133f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 134f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // TopLevelRegion 135f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!exit) 136f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 137f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 138f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (pred_iterator PI = pred_begin(entry), PE = pred_end(entry); PI != PE; 13973362c820bad20e545d37b8a2414c35c0d3d583cTobias Grosser ++PI) { 14073362c820bad20e545d37b8a2414c35c0d3d583cTobias Grosser BasicBlock *Pred = *PI; 14173362c820bad20e545d37b8a2414c35c0d3d583cTobias Grosser if (DT->getNode(Pred) && !contains(Pred)) { 142f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (found) { 143f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser isSimple = false; 144f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser break; 145f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 146f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser found = true; 147f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 14873362c820bad20e545d37b8a2414c35c0d3d583cTobias Grosser } 149f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 150f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser found = false; 151f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 152f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (pred_iterator PI = pred_begin(exit), PE = pred_end(exit); PI != PE; 153f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser ++PI) 154f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (contains(*PI)) { 155f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (found) { 156f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser isSimple = false; 157f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser break; 158f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 159f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser found = true; 160f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 161f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 162f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return isSimple; 163f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 164f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 165082d587d35a41ee06985d7867b72fb2632962281Tobias Grosserstd::string Region::getNameStr() const { 166082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser std::string exitName; 167082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser std::string entryName; 168082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 169082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (getEntry()->getName().empty()) { 170082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser raw_string_ostream OS(entryName); 171082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 172082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser WriteAsOperand(OS, getEntry(), false); 173082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser entryName = OS.str(); 174082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser } else 175082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser entryName = getEntry()->getNameStr(); 176082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 177082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (getExit()) { 178082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser if (getExit()->getName().empty()) { 179082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser raw_string_ostream OS(exitName); 180082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 181082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser WriteAsOperand(OS, getExit(), false); 182082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser exitName = OS.str(); 183082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser } else 184082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser exitName = getExit()->getNameStr(); 185082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser } else 186082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser exitName = "<Function Return>"; 187082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 188082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser return entryName + " => " + exitName; 189082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser} 190082d587d35a41ee06985d7867b72fb2632962281Tobias Grosser 191f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::verifyBBInRegion(BasicBlock *BB) const { 192f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!contains(BB)) 193f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser llvm_unreachable("Broken region found!"); 194f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 195f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *entry = getEntry(), *exit = getExit(); 196f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 197f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE; ++SI) 198f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!contains(*SI) && exit != *SI) 199f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser llvm_unreachable("Broken region found!"); 200f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 201f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (entry != BB) 202f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (pred_iterator SI = pred_begin(BB), SE = pred_end(BB); SI != SE; ++SI) 203f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!contains(*SI)) 204f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser llvm_unreachable("Broken region found!"); 205f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 206f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 207f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::verifyWalk(BasicBlock *BB, std::set<BasicBlock*> *visited) const { 208f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *exit = getExit(); 209f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 210f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser visited->insert(BB); 211f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 212f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser verifyBBInRegion(BB); 213f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 214f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE; ++SI) 215f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (*SI != exit && visited->find(*SI) == visited->end()) 216f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser verifyWalk(*SI, visited); 217f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 218f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 219f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::verifyRegion() const { 220f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Only do verification when user wants to, otherwise this expensive 221f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // check will be invoked by PassManager. 222f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!VerifyRegionInfo) return; 223f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 224f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser std::set<BasicBlock*> visited; 225f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser verifyWalk(getEntry(), &visited); 226f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 227f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 228f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::verifyRegionNest() const { 229f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (Region::const_iterator RI = begin(), RE = end(); RI != RE; ++RI) 230f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser (*RI)->verifyRegionNest(); 231f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 232f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser verifyRegion(); 233f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 234f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 235f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::block_iterator Region::block_begin() { 236f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<FlatIt<Region*> >::nodes_begin(this); 237f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 238f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 239f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::block_iterator Region::block_end() { 240f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<FlatIt<Region*> >::nodes_end(this); 241f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 242f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 243f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::const_block_iterator Region::block_begin() const { 244f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<FlatIt<const Region*> >::nodes_begin(this); 245f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 246f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 247f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::const_block_iterator Region::block_end() const { 248f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<FlatIt<const Region*> >::nodes_end(this); 249f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 250f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 251f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::element_iterator Region::element_begin() { 252f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<Region*>::nodes_begin(this); 253f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 254f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 255f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::element_iterator Region::element_end() { 256f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<Region*>::nodes_end(this); 257f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 258f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 259f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::const_element_iterator Region::element_begin() const { 260f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<const Region*>::nodes_begin(this); 261f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 262f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 263f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion::const_element_iterator Region::element_end() const { 264f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return GraphTraits<const Region*>::nodes_end(this); 265f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 266f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 267f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion* Region::getSubRegionNode(BasicBlock *BB) const { 268f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region *R = RI->getRegionFor(BB); 269f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 270f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!R || R == this) 271f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return 0; 272f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 273f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // If we pass the BB out of this region, that means our code is broken. 274f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(contains(R) && "BB not in current region!"); 275f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 276f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser while (contains(R->getParent()) && R->getParent() != this) 277f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser R = R->getParent(); 278f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 279f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (R->getEntry() != BB) 280f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return 0; 281f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 282f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return R; 283f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 284f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 285f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegionNode* Region::getBBNode(BasicBlock *BB) const { 286f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(contains(BB) && "Can get BB node out of this region!"); 287f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 288f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBNodeMapT::const_iterator at = BBNodeMap.find(BB); 289f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 290f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (at != BBNodeMap.end()) 291f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return at->second; 292f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 293f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser RegionNode *NewNode = new RegionNode(const_cast<Region*>(this), BB); 294f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBNodeMap.insert(std::make_pair(BB, NewNode)); 295f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return NewNode; 296f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 297f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 298f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegionNode* Region::getNode(BasicBlock *BB) const { 299f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(contains(BB) && "Can get BB node out of this region!"); 300f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (Region* Child = getSubRegionNode(BB)) 301f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return Child->getNode(); 302f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 303f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return getBBNode(BB); 304f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 305f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 306f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::transferChildrenTo(Region *To) { 307f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (iterator I = begin(), E = end(); I != E; ++I) { 308f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser (*I)->parent = To; 309f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser To->children.push_back(*I); 310f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 311f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser children.clear(); 312f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 313f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 314f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::addSubRegion(Region *SubRegion) { 315f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(SubRegion->parent == 0 && "SubRegion already has a parent!"); 316f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser SubRegion->parent = this; 317f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Set up the region node. 318f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(std::find(children.begin(), children.end(), SubRegion) == children.end() 319f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser && "Node already exist!"); 320f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser children.push_back(SubRegion); 321f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 322f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 323f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 324f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion *Region::removeSubRegion(Region *Child) { 325f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(Child->parent == this && "Child is not a child of this region!"); 326f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Child->parent = 0; 327f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser RegionSet::iterator I = std::find(children.begin(), children.end(), Child); 328f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(I != children.end() && "Region does not exit. Unable to remove."); 329f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser children.erase(children.begin()+(I-begin())); 330f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return Child; 331f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 332f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 333f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserunsigned Region::getDepth() const { 334f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser unsigned Depth = 0; 335f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 336f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (Region *R = parent; R != 0; R = R->parent) 337f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser ++Depth; 338f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 339f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return Depth; 340f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 341f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 342f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::print(raw_ostream &OS, bool print_tree, unsigned level) const { 343f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (print_tree) 344f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS.indent(level*2) << "[" << level << "] " << getNameStr(); 345f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser else 346f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS.indent(level*2) << getNameStr(); 347f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 348f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS << "\n"; 349f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 350f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 351f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (printStyle != PrintNone) { 352f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS.indent(level*2) << "{\n"; 353f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS.indent(level*2 + 2); 354f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 355f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (printStyle == PrintBB) { 356f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (const_block_iterator I = block_begin(), E = block_end(); I!=E; ++I) 357f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS << **I << ", "; // TODO: remove the last "," 358f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } else if (printStyle == PrintRN) { 359f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (const_element_iterator I = element_begin(), E = element_end(); I!=E; ++I) 360f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS << **I << ", "; // TODO: remove the last ", 361f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 362f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 363f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS << "\n"; 364f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 365f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 366f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (print_tree) 367f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (const_iterator RI = begin(), RE = end(); RI != RE; ++RI) 368f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser (*RI)->print(OS, print_tree, level+1); 369f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 370f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (printStyle != PrintNone) 371f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS.indent(level*2) << "} \n"; 372f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 373f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 374f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::dump() const { 375f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser print(dbgs(), true, getDepth()); 376f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 377f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 378f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid Region::clearNodeCache() { 379f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBNodeMap.clear(); 380f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (Region::iterator RI = begin(), RE = end(); RI != RE; ++RI) 381f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser (*RI)->clearNodeCache(); 382f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 383f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 384f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser//===----------------------------------------------------------------------===// 385f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// RegionInfo implementation 386f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// 387f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 388f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserbool RegionInfo::isCommonDomFrontier(BasicBlock *BB, BasicBlock *entry, 389f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *exit) const { 3903d8586eb6384f22984e8c519ea9742eac68c9724Gabor Greif for (pred_iterator PI = pred_begin(BB), PE = pred_end(BB); PI != PE; ++PI) { 3913d8586eb6384f22984e8c519ea9742eac68c9724Gabor Greif BasicBlock *P = *PI; 3923d8586eb6384f22984e8c519ea9742eac68c9724Gabor Greif if (DT->dominates(entry, P) && !DT->dominates(exit, P)) 393f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 3943d8586eb6384f22984e8c519ea9742eac68c9724Gabor Greif } 395f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return true; 396f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 397f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 398f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserbool RegionInfo::isRegion(BasicBlock *entry, BasicBlock *exit) const { 399f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(entry && exit && "entry and exit must not be null!"); 400f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser typedef DominanceFrontier::DomSetType DST; 401f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 40211aa60d05ac3a26a547022f574fa09dfeec2e0ccGabor Greif DST *entrySuccs = &DF->find(entry)->second; 403f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 404f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Exit is the header of a loop that contains the entry. In this case, 405f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // the dominance frontier must only contain the exit. 406f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!DT->dominates(entry, exit)) { 407f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (DST::iterator SI = entrySuccs->begin(), SE = entrySuccs->end(); 408f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser SI != SE; ++SI) 409f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (*SI != exit && *SI != entry) 410f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 411f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 412f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return true; 413f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 414f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 41511aa60d05ac3a26a547022f574fa09dfeec2e0ccGabor Greif DST *exitSuccs = &DF->find(exit)->second; 416f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 417f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Do not allow edges leaving the region. 418f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (DST::iterator SI = entrySuccs->begin(), SE = entrySuccs->end(); 419f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser SI != SE; ++SI) { 420f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (*SI == exit || *SI == entry) 421f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser continue; 422f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (exitSuccs->find(*SI) == exitSuccs->end()) 423f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 424f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!isCommonDomFrontier(*SI, entry, exit)) 425f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 426f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 427f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 428f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Do not allow edges pointing into the region. 429f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (DST::iterator SI = exitSuccs->begin(), SE = exitSuccs->end(); 430f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser SI != SE; ++SI) 431a29dbd2dcc04c8d07dd9e1e49b4e54debbc23996Dan Gohman if (DT->properlyDominates(entry, *SI) && *SI != exit) 432f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 433f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 434f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 435f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return true; 436f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 437f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 438f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::insertShortCut(BasicBlock *entry, BasicBlock *exit, 439f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoBBMap *ShortCut) const { 440f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(entry && exit && "entry and exit must not be null!"); 441f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 442f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoBBMap::iterator e = ShortCut->find(exit); 443f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 444f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (e == ShortCut->end()) 445f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // No further region at exit available. 446f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser (*ShortCut)[entry] = exit; 447f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser else { 448f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // We found a region e that starts at exit. Therefore (entry, e->second) 449f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // is also a region, that is larger than (entry, exit). Insert the 450f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // larger one. 451f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *BB = e->second; 452f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser (*ShortCut)[entry] = BB; 453f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 454f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 455f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 456f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserDomTreeNode* RegionInfo::getNextPostDom(DomTreeNode* N, 457f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoBBMap *ShortCut) const { 458f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoBBMap::iterator e = ShortCut->find(N->getBlock()); 459f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 460f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (e == ShortCut->end()) 461f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return N->getIDom(); 462f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 463f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return PDT->getNode(e->second)->getIDom(); 464f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 465f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 466f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserbool RegionInfo::isTrivialRegion(BasicBlock *entry, BasicBlock *exit) const { 467f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(entry && exit && "entry and exit must not be null!"); 468f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 469f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser unsigned num_successors = succ_end(entry) - succ_begin(entry); 470f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 471f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (num_successors <= 1 && exit == *(succ_begin(entry))) 472f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return true; 473f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 474f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 475f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 476f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 477f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::updateStatistics(Region *R) { 478f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser ++numRegions; 479f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 480f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // TODO: Slow. Should only be enabled if -stats is used. 481f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (R->isSimple()) ++numSimpleRegions; 482f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 483f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 484f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion *RegionInfo::createRegion(BasicBlock *entry, BasicBlock *exit) { 485f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(entry && exit && "entry and exit must not be null!"); 486f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 487f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (isTrivialRegion(entry, exit)) 488f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return 0; 489f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 490f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region *region = new Region(entry, exit, this, DT); 491f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoRegion.insert(std::make_pair(entry, region)); 492f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 493f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser #ifdef XDEBUG 494f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser region->verifyRegion(); 495f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser #else 496f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser DEBUG(region->verifyRegion()); 497f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser #endif 498f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 499f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser updateStatistics(region); 500f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return region; 501f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 502f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 503f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::findRegionsWithEntry(BasicBlock *entry, BBtoBBMap *ShortCut) { 504f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert(entry); 505f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 506f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser DomTreeNode *N = PDT->getNode(entry); 507f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 508f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!N) 509f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return; 510f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 511f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region *lastRegion= 0; 512f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *lastExit = entry; 513f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 514f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // As only a BasicBlock that postdominates entry can finish a region, walk the 515f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // post dominance tree upwards. 516f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser while ((N = getNextPostDom(N, ShortCut))) { 517f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *exit = N->getBlock(); 518f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 519f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!exit) 520f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser break; 521f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 522f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (isRegion(entry, exit)) { 523f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region *newRegion = createRegion(entry, exit); 524f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 525f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (lastRegion) 526f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser newRegion->addSubRegion(lastRegion); 527f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 528f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser lastRegion = newRegion; 529f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser lastExit = exit; 530f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 531f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 532f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // This can never be a region, so stop the search. 533f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!DT->dominates(entry, exit)) 534f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser break; 535f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 536f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 537f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Tried to create regions from entry to lastExit. Next time take a 538f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // shortcut from entry to lastExit. 539f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (lastExit != entry) 540f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser insertShortCut(entry, lastExit, ShortCut); 541f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 542f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 543f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::scanForRegions(Function &F, BBtoBBMap *ShortCut) { 544f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *entry = &(F.getEntryBlock()); 545f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser DomTreeNode *N = DT->getNode(entry); 546f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 547f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Iterate over the dominance tree in post order to start with the small 548f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // regions from the bottom of the dominance tree. If the small regions are 549f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // detected first, detection of bigger regions is faster, as we can jump 550f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // over the small regions. 551f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (po_iterator<DomTreeNode*> FI = po_begin(N), FE = po_end(N); FI != FE; 552f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser ++FI) { 553f95eef695d35cac832dfd1ff2b2e3081f7d0e24aGabor Greif findRegionsWithEntry(FI->getBlock(), ShortCut); 554f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 555f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 556f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 557f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion *RegionInfo::getTopMostParent(Region *region) { 558f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser while (region->parent) 559f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser region = region->getParent(); 560f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 561f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return region; 562f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 563f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 564f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::buildRegionsTree(DomTreeNode *N, Region *region) { 565f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *BB = N->getBlock(); 566f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 567f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Passed region exit 568f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser while (BB == region->getExit()) 569f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser region = region->getParent(); 570f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 571f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoRegionMap::iterator it = BBtoRegion.find(BB); 572f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 573f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // This basic block is a start block of a region. It is already in the 574f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // BBtoRegion relation. Only the child basic blocks have to be updated. 575f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (it != BBtoRegion.end()) { 576f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region *newRegion = it->second;; 577f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser region->addSubRegion(getTopMostParent(newRegion)); 578f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser region = newRegion; 579f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } else { 580f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoRegion[BB] = region; 581f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 582f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 583f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (DomTreeNode::iterator CI = N->begin(), CE = N->end(); CI != CE; ++CI) 584f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser buildRegionsTree(*CI, region); 585f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 586f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 587f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::releaseMemory() { 588f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoRegion.clear(); 589f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (TopLevelRegion) 590f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser delete TopLevelRegion; 591f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser TopLevelRegion = 0; 592f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 593f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 59490c579de5a383cee278acc3f7e7b9d0a656e6a35Owen AndersonRegionInfo::RegionInfo() : FunctionPass(ID) { 595f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser TopLevelRegion = 0; 596f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 597f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 598f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegionInfo::~RegionInfo() { 599f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser releaseMemory(); 600f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 601f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 602f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::Calculate(Function &F) { 603f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // ShortCut a function where for every BB the exit of the largest region 604f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // starting with BB is stored. These regions can be threated as single BBS. 605f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // This improves performance on linear CFGs. 606f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoBBMap ShortCut; 607f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 608f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser scanForRegions(F, &ShortCut); 609f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BasicBlock *BB = &F.getEntryBlock(); 610f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser buildRegionsTree(DT->getNode(BB), TopLevelRegion); 611f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 612f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 613f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserbool RegionInfo::runOnFunction(Function &F) { 614f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser releaseMemory(); 615f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 616f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser DT = &getAnalysis<DominatorTree>(); 617f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser PDT = &getAnalysis<PostDominatorTree>(); 618f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser DF = &getAnalysis<DominanceFrontier>(); 619f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 620f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser TopLevelRegion = new Region(&F.getEntryBlock(), 0, this, DT, 0); 621f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser updateStatistics(TopLevelRegion); 622f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 623f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Calculate(F); 624f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 625f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return false; 626f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 627f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 628f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::getAnalysisUsage(AnalysisUsage &AU) const { 629f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser AU.setPreservesAll(); 630f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser AU.addRequiredTransitive<DominatorTree>(); 631f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser AU.addRequired<PostDominatorTree>(); 632f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser AU.addRequired<DominanceFrontier>(); 633f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 634f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 635f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::print(raw_ostream &OS, const Module *) const { 636f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS << "Region tree:\n"; 637f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser TopLevelRegion->print(OS, true, 0); 638f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser OS << "End region tree\n"; 639f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 640f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 641f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosservoid RegionInfo::verifyAnalysis() const { 642f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // Only do verification when user wants to, otherwise this expensive check 643f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // will be invoked by PMDataManager::verifyPreservedAnalysis when 644f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser // a regionpass (marked PreservedAll) finish. 645f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (!VerifyRegionInfo) return; 646f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 647f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser TopLevelRegion->verifyRegionNest(); 648f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 649f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 650f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// Region pass manager support. 651f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion *RegionInfo::getRegionFor(BasicBlock *BB) const { 652f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoRegionMap::const_iterator I= 653f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBtoRegion.find(BB); 654f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return I != BBtoRegion.end() ? I->second : 0; 655f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 656f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 657f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion *RegionInfo::operator[](BasicBlock *BB) const { 658f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return getRegionFor(BB); 659f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 660f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 6610e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6620e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias GrosserBasicBlock *RegionInfo::getMaxRegionExit(BasicBlock *BB) const { 6630e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser BasicBlock *Exit = NULL; 6640e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6650e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser while (true) { 6660e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser // Get largest region that starts at BB. 6670e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser Region *R = getRegionFor(BB); 6680e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser while (R && R->getParent() && R->getParent()->getEntry() == BB) 6690e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser R = R->getParent(); 6700e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6710e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser // Get the single exit of BB. 6720e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser if (R && R->getEntry() == BB) 6730e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser Exit = R->getExit(); 6740e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser else if (++succ_begin(BB) == succ_end(BB)) 6750e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser Exit = *succ_begin(BB); 6760e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser else // No single exit exists. 6770e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser return Exit; 6780e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6790e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser // Get largest region that starts at Exit. 6800e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser Region *ExitR = getRegionFor(Exit); 6810e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser while (ExitR && ExitR->getParent() 6820e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser && ExitR->getParent()->getEntry() == Exit) 6830e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser ExitR = ExitR->getParent(); 6840e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6850e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser for (pred_iterator PI = pred_begin(Exit), PE = pred_end(Exit); PI != PE; 6860e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser ++PI) 6870e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser if (!R->contains(*PI) && !ExitR->contains(*PI)) 6880e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser break; 6890e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6900e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser // This stops infinite cycles. 6910e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser if (DT->dominates(Exit, BB)) 6920e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser break; 6930e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6940e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser BB = Exit; 6950e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser } 6960e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 6970e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser return Exit; 6980e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser} 6990e6fcf4be360f5d73685c213e3b4af1bb9ce2b5dTobias Grosser 700f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion* 701f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegionInfo::getCommonRegion(Region *A, Region *B) const { 702f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser assert (A && B && "One of the Regions is NULL"); 703f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 704f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser if (A->contains(B)) return A; 705f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 706f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser while (!B->contains(A)) 707f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser B = B->getParent(); 708f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 709f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return B; 710f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 711f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 712f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion* 713f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegionInfo::getCommonRegion(SmallVectorImpl<Region*> &Regions) const { 714f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region* ret = Regions.back(); 715f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Regions.pop_back(); 716f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 717f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (SmallVectorImpl<Region*>::const_iterator I = Regions.begin(), 718f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser E = Regions.end(); I != E; ++I) 719f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser ret = getCommonRegion(ret, *I); 720f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 721f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return ret; 722f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 723f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 724f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegion* 725f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserRegionInfo::getCommonRegion(SmallVectorImpl<BasicBlock*> &BBs) const { 726f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser Region* ret = getRegionFor(BBs.back()); 727f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser BBs.pop_back(); 728f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 729f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser for (SmallVectorImpl<BasicBlock*>::const_iterator I = BBs.begin(), 730f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser E = BBs.end(); I != E; ++I) 731f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser ret = getCommonRegion(ret, getRegionFor(*I)); 732f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 733f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return ret; 734f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 735f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 736f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosserchar RegionInfo::ID = 0; 737f96b0063674e6bf72da5429bd49097e33c2325c7Tobias GrosserINITIALIZE_PASS(RegionInfo, "regions", 738f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser "Detect single entry single exit regions", true, true); 739f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 740f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// Create methods available outside of this file, to use them 741f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by 742f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser// the link time optimization. 743f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 744f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grossernamespace llvm { 745f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser FunctionPass *createRegionInfoPass() { 746f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser return new RegionInfo(); 747f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser } 748f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser} 749f96b0063674e6bf72da5429bd49097e33c2325c7Tobias Grosser 750