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[Constant Hoisting] Make the constant candidate map local to the collectConstantCandidates method. 

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204758 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka 2014-03-25 21:21:10 +00:00
parent 7e77dabbd0
commit 63dfd62bf8
1 changed files with 14 additions and 11 deletions
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25
lib/Transforms/Scalar/ConstantHoisting.cpp
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@ -109,7 +109,6 @@ class ConstantHoisting : public FunctionPass {
BasicBlock *Entry;
/// Keeps track of constant candidates found in the function.
ConstCandMapType ConstCandMap;
ConstCandVecType ConstCandVec;
/// Keep track of cast instructions we already cloned.
@ -146,7 +145,6 @@ private:
ConstantVec.clear();
ClonedCastMap.clear();
ConstCandVec.clear();
ConstCandMap.clear();
TTI = nullptr;
DT = nullptr;
@ -166,9 +164,11 @@ private:
BasicBlock *findIDomOfAllUses(const ConstantUseListType &Uses) const;
Instruction *findMatInsertPt(Instruction *Inst, unsigned Idx = ~0U) const;
Instruction *findConstantInsertionPoint(const ConstantInfo &ConstInfo) const;
void collectConstantCandidates(Instruction *Inst, unsigned Idx,
void collectConstantCandidates(ConstCandMapType &ConstCandMap,
Instruction *Inst, unsigned Idx,
ConstantInt *ConstInt);
void collectConstantCandidates(Instruction *Inst);
void collectConstantCandidates(ConstCandMapType &ConstCandMap,
Instruction *Inst);
void collectConstantCandidates(Function &Fn);
void findAndMakeBaseConstant(ConstCandVecType::iterator S,
ConstCandVecType::iterator E);
@ -295,7 +295,8 @@ findConstantInsertionPoint(const ConstantInfo &ConstInfo) const {
/// The operand at index Idx is not necessarily the constant integer itself. It
/// could also be a cast instruction or a constant expression that uses the
// constant integer.
void ConstantHoisting::collectConstantCandidates(Instruction *Inst,
void ConstantHoisting::collectConstantCandidates(ConstCandMapType &ConstCandMap,
Instruction *Inst,
unsigned Idx,
ConstantInt *ConstInt) {
unsigned Cost;
@ -331,7 +332,8 @@ void ConstantHoisting::collectConstantCandidates(Instruction *Inst,
/// \brief Scan the instruction for expensive integer constants and record them
/// in the constant candidate vector.
void ConstantHoisting::collectConstantCandidates(Instruction *Inst) {
void ConstantHoisting::collectConstantCandidates(ConstCandMapType &ConstCandMap,
Instruction *Inst) {
// Skip all cast instructions. They are visited indirectly later on.
if (Inst->isCast())
return;
@ -345,9 +347,9 @@ void ConstantHoisting::collectConstantCandidates(Instruction *Inst) {
for (unsigned Idx = 0, E = Inst->getNumOperands(); Idx != E; ++Idx) {
Value *Opnd = Inst->getOperand(Idx);
// Vist constant integers.
// Visit constant integers.
if (auto ConstInt = dyn_cast<ConstantInt>(Opnd)) {
collectConstantCandidates(Inst, Idx, ConstInt);
collectConstantCandidates(ConstCandMap, Inst, Idx, ConstInt);
continue;
}
@ -361,7 +363,7 @@ void ConstantHoisting::collectConstantCandidates(Instruction *Inst) {
if (auto *ConstInt = dyn_cast<ConstantInt>(CastInst->getOperand(0))) {
// Pretend the constant is directly used by the instruction and ignore
// the cast instruction.
collectConstantCandidates(Inst, Idx, ConstInt);
collectConstantCandidates(ConstCandMap, Inst, Idx, ConstInt);
continue;
}
}
@ -375,7 +377,7 @@ void ConstantHoisting::collectConstantCandidates(Instruction *Inst) {
if (auto ConstInt = dyn_cast<ConstantInt>(ConstExpr->getOperand(0))) {
// Pretend the constant is directly used by the instruction and ignore
// the constant expression.
collectConstantCandidates(Inst, Idx, ConstInt);
collectConstantCandidates(ConstCandMap, Inst, Idx, ConstInt);
continue;
}
}
@ -385,9 +387,10 @@ void ConstantHoisting::collectConstantCandidates(Instruction *Inst) {
/// \brief Collect all integer constants in the function that cannot be folded
/// into an instruction itself.
void ConstantHoisting::collectConstantCandidates(Function &Fn) {
ConstCandMapType ConstCandMap;
for (Function::iterator BB : Fn)
for (BasicBlock::iterator Inst : *BB)
collectConstantCandidates(Inst);
collectConstantCandidates(ConstCandMap, Inst);
}
/// \brief Find the base constant within the given range and rebase all other