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start using smallvector to avoid vector heap thrashing.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45873 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-11 18:43:58 +00:00
parent 8874628e30
commit a10145fdf6
1 changed files with 7 additions and 6 deletions
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13
lib/Transforms/IPO/ArgumentPromotion.cpp
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@ -70,7 +70,8 @@ namespace {
private:
bool PromoteArguments(CallGraphNode *CGN);
bool isSafeToPromoteArgument(Argument *Arg) const;
Function *DoPromotion(Function *F, std::vector<Argument*> &ArgsToPromote);
Function *DoPromotion(Function *F,
SmallVectorImpl<Argument*> &ArgsToPromote);
};
char ArgPromotion::ID = 0;
@ -108,7 +109,7 @@ bool ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
if (!F || !F->hasInternalLinkage()) return false;
// First check: see if there are any pointer arguments! If not, quick exit.
std::vector<Argument*> PointerArgs;
SmallVector<Argument*, 16> PointerArgs;
for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
if (isa<PointerType>(I->getType()))
PointerArgs.push_back(I);
@ -193,8 +194,8 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg) const {
// instructions (with constant indices) that are subsequently loaded.
bool HasLoadInEntryBlock = false;
BasicBlock *EntryBlock = Arg->getParent()->begin();
std::vector<LoadInst*> Loads;
std::vector<std::vector<ConstantInt*> > GEPIndices;
SmallVector<LoadInst*, 16> Loads;
std::vector<SmallVector<ConstantInt*, 8> > GEPIndices;
for (Value::use_iterator UI = Arg->use_begin(), E = Arg->use_end();
UI != E; ++UI)
if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
@ -210,7 +211,7 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg) const {
return isSafeToPromoteArgument(Arg);
}
// Ensure that all of the indices are constants.
std::vector<ConstantInt*> Operands;
SmallVector<ConstantInt*, 8> Operands;
for (unsigned i = 1, e = GEP->getNumOperands(); i != e; ++i)
if (ConstantInt *C = dyn_cast<ConstantInt>(GEP->getOperand(i)))
Operands.push_back(C);
@ -326,7 +327,7 @@ namespace {
/// arguments, and returns the new function. At this point, we know that it's
/// safe to do so.
Function *ArgPromotion::DoPromotion(Function *F,
std::vector<Argument*> &Args2Prom) {
SmallVectorImpl<Argument*> &Args2Prom) {
std::set<Argument*> ArgsToPromote(Args2Prom.begin(), Args2Prom.end());
// Start by computing a new prototype for the function, which is the same as