1 files changed, 0 insertions, 177 deletions
diff --git a/lib/Transforms/Scalar/LoopUnroll.cpp b/lib/Transforms/Scalar/LoopUnroll.cpp
deleted file mode 100644
index 837ec59..0000000
--- a/lib/Transforms/Scalar/LoopUnroll.cpp
+++ /dev/null
@@ -1,177 +0,0 @@
-//===-- LoopUnroll.cpp - Loop unroller pass -------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass implements a simple loop unroller.  It works best when loops have
-// been canonicalized by the -indvars pass, allowing it to determine the trip
-// counts of loops easily.
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "loop-unroll"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Analysis/LoopInfo.h"
-#include "llvm/Analysis/LoopPass.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/Utils/UnrollLoop.h"
-#include <climits>
-
-using namespace llvm;
-
-static cl::opt<unsigned>
-UnrollThreshold("unroll-threshold", cl::init(100), cl::Hidden,
-  cl::desc("The cut-off point for automatic loop unrolling"));
-
-static cl::opt<unsigned>
-UnrollCount("unroll-count", cl::init(0), cl::Hidden,
-  cl::desc("Use this unroll count for all loops, for testing purposes"));
-
-static cl::opt<bool>
-UnrollAllowPartial("unroll-allow-partial", cl::init(false), cl::Hidden,
-  cl::desc("Allows loops to be partially unrolled until "
-           "-unroll-threshold loop size is reached."));
-
-namespace {
-  class LoopUnroll : public LoopPass {
-  public:
-    static char ID; // Pass ID, replacement for typeid
-    LoopUnroll() : LoopPass(&ID) {}
-
-    /// A magic value for use with the Threshold parameter to indicate
-    /// that the loop unroll should be performed regardless of how much
-    /// code expansion would result.
-    static const unsigned NoThreshold = UINT_MAX;
-
-    bool runOnLoop(Loop *L, LPPassManager &LPM);
-
-    /// This transformation requires natural loop information & requires that
-    /// loop preheaders be inserted into the CFG...
-    ///
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.addRequiredID(LoopSimplifyID);
-      AU.addRequiredID(LCSSAID);
-      AU.addRequired<LoopInfo>();
-      AU.addPreservedID(LCSSAID);
-      AU.addPreserved<LoopInfo>();
-      // FIXME: Loop unroll requires LCSSA. And LCSSA requires dom info.
-      // If loop unroll does not preserve dom info then LCSSA pass on next
-      // loop will receive invalid dom info.
-      // For now, recreate dom info, if loop is unrolled.
-      AU.addPreserved<DominatorTree>();
-      AU.addPreserved<DominanceFrontier>();
-    }
-  };
-}
-
-char LoopUnroll::ID = 0;
-static RegisterPass<LoopUnroll> X("loop-unroll", "Unroll loops");
-
-Pass *llvm::createLoopUnrollPass() { return new LoopUnroll(); }
-
-/// ApproximateLoopSize - Approximate the size of the loop.
-static unsigned ApproximateLoopSize(const Loop *L) {
-  unsigned Size = 0;
-  for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
-       I != E; ++I) {
-    BasicBlock *BB = *I;
-    Instruction *Term = BB->getTerminator();
-    for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
-      if (isa<PHINode>(I) && BB == L->getHeader()) {
-        // Ignore PHI nodes in the header.
-      } else if (I->hasOneUse() && I->use_back() == Term) {
-        // Ignore instructions only used by the loop terminator.
-      } else if (isa<DbgInfoIntrinsic>(I)) {
-        // Ignore debug instructions
-      } else if (isa<GetElementPtrInst>(I) && I->hasOneUse()) {
-        // Ignore GEP as they generally are subsumed into a load or store.
-      } else if (isa<CallInst>(I)) {
-        // Estimate size overhead introduced by call instructions which
-        // is higher than other instructions. Here 3 and 10 are magic
-        // numbers that help one isolated test case from PR2067 without
-        // negatively impacting measured benchmarks.
-        Size += isa<IntrinsicInst>(I) ? 3 : 10;
-      } else {
-        ++Size;
-      }
-
-      // TODO: Ignore expressions derived from PHI and constants if inval of phi
-      // is a constant, or if operation is associative.  This will get induction
-      // variables.
-    }
-  }
-
-  return Size;
-}
-
-bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
-  assert(L->isLCSSAForm());
-  LoopInfo *LI = &getAnalysis<LoopInfo>();
-
-  BasicBlock *Header = L->getHeader();
-  DEBUG(errs() << "Loop Unroll: F[" << Header->getParent()->getName()
-        << "] Loop %" << Header->getName() << "\n");
-  (void)Header;
-
-  // Find trip count
-  unsigned TripCount = L->getSmallConstantTripCount();
-  unsigned Count = UnrollCount;
-
-  // Automatically select an unroll count.
-  if (Count == 0) {
-    // Conservative heuristic: if we know the trip count, see if we can
-    // completely unroll (subject to the threshold, checked below); otherwise
-    // try to find greatest modulo of the trip count which is still under
-    // threshold value.
-    if (TripCount == 0)
-      return false;
-    Count = TripCount;
-  }
-
-  // Enforce the threshold.
-  if (UnrollThreshold != NoThreshold) {
-    unsigned LoopSize = ApproximateLoopSize(L);
-    DEBUG(errs() << "  Loop Size = " << LoopSize << "\n");
-    uint64_t Size = (uint64_t)LoopSize*Count;
-    if (TripCount != 1 && Size > UnrollThreshold) {
-      DEBUG(errs() << "  Too large to fully unroll with count: " << Count
-            << " because size: " << Size << ">" << UnrollThreshold << "\n");
-      if (!UnrollAllowPartial) {
-        DEBUG(errs() << "  will not try to unroll partially because "
-              << "-unroll-allow-partial not given\n");
-        return false;
-      }
-      // Reduce unroll count to be modulo of TripCount for partial unrolling
-      Count = UnrollThreshold / LoopSize;
-      while (Count != 0 && TripCount%Count != 0) {
-        Count--;
-      }
-      if (Count < 2) {
-        DEBUG(errs() << "  could not unroll partially\n");
-        return false;
-      }
-      DEBUG(errs() << "  partially unrolling with count: " << Count << "\n");
-    }
-  }
-
-  // Unroll the loop.
-  Function *F = L->getHeader()->getParent();
-  if (!UnrollLoop(L, Count, LI, &LPM))
-    return false;
-
-  // FIXME: Reconstruct dom info, because it is not preserved properly.
-  DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>();
-  if (DT) {
-    DT->runOnFunction(*F);
-    DominanceFrontier *DF = getAnalysisIfAvailable<DominanceFrontier>();
-    if (DF)
-      DF->runOnFunction(*F);
-  }
-  return true;
-}