From 3821176b2eb9fe5e66929f3df6f204fa6cb2e4d6 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 30 Oct 2009 22:33:29 +0000
Subject: make hasAddressTaken() constant time by storing a refcount in BB's
 subclass data.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85625 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/BasicBlock.cpp |  8 --------
 lib/VMCore/Constants.cpp  | 12 +++++++-----
 2 files changed, 7 insertions(+), 13 deletions(-)

(limited to 'lib')

diff --git a/lib/VMCore/BasicBlock.cpp b/lib/VMCore/BasicBlock.cpp
index ede2d12451..e8069c0f05 100644
--- a/lib/VMCore/BasicBlock.cpp
+++ b/lib/VMCore/BasicBlock.cpp
@@ -278,11 +278,3 @@ BasicBlock *BasicBlock::splitBasicBlock(iterator I, const Twine &BBName) {
   return New;
 }
 
-/// hasAddressTaken - returns true if there are any uses of this basic block
-/// other than direct branches, switches, etc. to it.
-bool BasicBlock::hasAddressTaken() const {
-  for (Value::use_const_iterator I = use_begin(), E = use_end(); I != E; ++I)
-    if (isa<BlockAddress>(*I))
-      return true;
-  return false;
-}
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index 0d7fabacea..2d3d71b686 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -44,7 +44,7 @@ using namespace llvm;
 
 // Constructor to create a '0' constant of arbitrary type...
 static const uint64_t zero[2] = {0, 0};
-Constant* Constant::getNullValue(const Type* Ty) {
+Constant *Constant::getNullValue(const Type *Ty) {
   switch (Ty->getTypeID()) {
   case Type::IntegerTyID:
     return ConstantInt::get(Ty, 0);
@@ -72,7 +72,7 @@ Constant* Constant::getNullValue(const Type* Ty) {
   }
 }
 
-Constant* Constant::getIntegerValue(const Type* Ty, const APInt &V) {
+Constant* Constant::getIntegerValue(const Type *Ty, const APInt &V) {
   const Type *ScalarTy = Ty->getScalarType();
 
   // Create the base integer constant.
@@ -89,13 +89,13 @@ Constant* Constant::getIntegerValue(const Type* Ty, const APInt &V) {
   return C;
 }
 
-Constant* Constant::getAllOnesValue(const Type* Ty) {
-  if (const IntegerType* ITy = dyn_cast<IntegerType>(Ty))
+Constant* Constant::getAllOnesValue(const Type *Ty) {
+  if (const IntegerType *ITy = dyn_cast<IntegerType>(Ty))
     return ConstantInt::get(Ty->getContext(),
                             APInt::getAllOnesValue(ITy->getBitWidth()));
   
   std::vector<Constant*> Elts;
-  const VectorType* VTy = cast<VectorType>(Ty);
+  const VectorType *VTy = cast<VectorType>(Ty);
   Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
   assert(Elts[0] && "Not a vector integer type!");
   return cast<ConstantVector>(ConstantVector::get(Elts));
@@ -1045,6 +1045,7 @@ BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
            &Op<0>(), 2) {
   Op<0>() = F;
   Op<1>() = BB;
+  BB->AdjustBlockAddressRefCount(1);
 }
 
 
@@ -1053,6 +1054,7 @@ BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
 void BlockAddress::destroyConstant() {
   getFunction()->getType()->getContext().pImpl
     ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
+  getBasicBlock()->AdjustBlockAddressRefCount(-1);
   destroyConstantImpl();
 }
 
-- 
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