Pull these back out, they're a little too aggressive and time

consuming for a simple optimization.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95671 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 0 insertions, 115 deletions

diff --git a/lib/Transforms/Scalar/CMakeLists.txt b/lib/Transforms/Scalar/CMakeLists.txt
index fd95014d48..683c1c2fd7 100644
--- a/lib/Transforms/Scalar/CMakeLists.txt
+++ b/lib/Transforms/Scalar/CMakeLists.txt
@@ -18,7 +18,6 @@ add_llvm_library(LLVMScalarOpts
   LoopUnrollPass.cpp
   LoopUnswitch.cpp
   MemCpyOptimizer.cpp
-  ObjectSizeLowering.cpp
   Reassociate.cpp
   Reg2Mem.cpp
   SCCP.cpp
diff --git a/lib/Transforms/Scalar/ObjectSizeLowering.cpp b/lib/Transforms/Scalar/ObjectSizeLowering.cpp
deleted file mode 100644
index 9660e796c5..0000000000
--- a/lib/Transforms/Scalar/ObjectSizeLowering.cpp
+++ /dev/null
@@ -1,114 +0,0 @@
-//===-- ObjectSizeLowering.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 lowers Intrinsic::objectsize using SCEV to determine minimum or
-// maximum space left in an allocated object.
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "objsize-lower"
-#include "llvm/Constants.h"
-#include "llvm/Module.h"
-#include "llvm/Value.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Analysis/ScalarEvolution.h"
-#include "llvm/Analysis/ScalarEvolutionExpander.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace llvm;
-
-namespace {
-  class ObjSizeLower : public FunctionPass {
-    ScalarEvolution *SE;
-    TargetData *TD;
-  public:
-    static char ID; // Pass identification, replacement for typeid
-    ObjSizeLower() : FunctionPass(&ID) {}
-    
-    bool runOnFunction(Function &F);
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesCFG();
-      AU.addRequired<ScalarEvolution>();
-      AU.addPreserved<ScalarEvolution>();
-    }
-  private:
-    bool LowerCall(IntrinsicInst *);
-    void ReplaceAllUsesWithUnknown(IntrinsicInst *, bool);
-  };
-}
-
-char ObjSizeLower::ID = 0;
-static RegisterPass<ObjSizeLower> X("objsize-lower",
-                                    "Object Size Lowering");
-
-// Public interface to the Object Size Lowering pass
-FunctionPass *llvm::createObjectSizeLoweringPass() { 
-  return new ObjSizeLower();
-}
-
-/// runOnFunction - Top level algorithm - Loop over each object size intrinsic
-/// and use Scalar Evolutions to get the maximum or minimum size left in the
-/// allocated object at any point.
-bool ObjSizeLower::runOnFunction(Function &F) {
-  SE = &getAnalysis<ScalarEvolution>();
-  TD = getAnalysisIfAvailable<TargetData>();
-  
-  // We really need TargetData for size calculations.
-  if (!TD) return false;
-  
-  bool Changed = false;
-  for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
-    for (BasicBlock::iterator I = BB->begin(), L = BB->end(); I != L; ) {
-      CallInst *CI = dyn_cast<CallInst>(I++);
-      if (!CI) continue;
-
-      // The only thing we care about are Intrinsic::objectsize calls
-      IntrinsicInst *II = dyn_cast<IntrinsicInst>(CI);
-      if (!II || II->getIntrinsicID() != Intrinsic::objectsize) continue;
-
-      Changed |= LowerCall(II);
-    }
-  }
-  return Changed;
-}
-
-// Unknown for llvm.objsize is -1 for maximum size, and 0 for minimum size.
-void ObjSizeLower::ReplaceAllUsesWithUnknown(IntrinsicInst *II, bool min) {
-  const Type *ReturnTy = II->getCalledFunction()->getReturnType();
-  II->replaceAllUsesWith(ConstantInt::get(ReturnTy, min ? 0 : -1ULL));
-  II->eraseFromParent();
-}
-
-bool ObjSizeLower::LowerCall(IntrinsicInst *II) {
-  ConstantInt *CI = cast<ConstantInt>(II->getOperand(2));
-  bool minimum = (CI->getZExtValue() == 1);
-  Value *Op = II->getOperand(1);
-  const Type *ReturnTy = II->getCalledFunction()->getReturnType();
-
-  // Grab the SCEV for our access.
-  const SCEV *thisEV = SE->getSCEV(Op);
-
-  if (const SCEVUnknown *SU = dyn_cast<SCEVUnknown>(thisEV)) {
-    if (GlobalVariable *GV = dyn_cast<GlobalVariable>(SU->getValue())) {
-      if (GV->hasDefinitiveInitializer()) {
-        Constant *C = GV->getInitializer();
-        size_t globalSize = TD->getTypeAllocSize(C->getType());
-        II->replaceAllUsesWith(ConstantInt::get(ReturnTy, globalSize));
-        II->eraseFromParent();
-        return true;
-      }
-    }
-  }
-
-  ReplaceAllUsesWithUnknown(II, minimum);
-  return true;
-}