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Clean up some of this code a tiny bit, no functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186622 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2013-07-18 22:32:32 +00:00
parent 771e0ab32a
commit b05ad799e7
1 changed files with 8 additions and 13 deletions
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21
lib/Transforms/IPO/ArgumentPromotion.cpp
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@ -126,12 +126,10 @@ CallGraphNode *ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
if (!F || !F->hasLocalLinkage()) return 0;
// First check: see if there are any pointer arguments! If not, quick exit.
SmallVector<std::pair<Argument*, unsigned>, 16> PointerArgs;
unsigned ArgNo = 0;
for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I, ++ArgNo)
SmallVector<Argument*, 16> PointerArgs;
for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
if (I->getType()->isPointerTy())
PointerArgs.push_back(std::pair<Argument*, unsigned>(I, ArgNo));
PointerArgs.push_back(I);
if (PointerArgs.empty()) return 0;
// Second check: make sure that all callers are direct callers. We can't
@ -152,15 +150,13 @@ CallGraphNode *ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
// add it to ArgsToPromote.
SmallPtrSet<Argument*, 8> ArgsToPromote;
SmallPtrSet<Argument*, 8> ByValArgsToTransform;
for (unsigned i = 0; i != PointerArgs.size(); ++i) {
bool isByVal=F->getAttributes().
hasAttribute(PointerArgs[i].second+1, Attribute::ByVal);
Argument *PtrArg = PointerArgs[i].first;
for (unsigned i = 0, e = PointerArgs.size(); i != e; ++i) {
Argument *PtrArg = PointerArgs[i];
Type *AgTy = cast<PointerType>(PtrArg->getType())->getElementType();
// If this is a byval argument, and if the aggregate type is small, just
// pass the elements, which is always safe.
if (isByVal) {
if (PtrArg->hasByValAttr()) {
if (StructType *STy = dyn_cast<StructType>(AgTy)) {
if (maxElements > 0 && STy->getNumElements() > maxElements) {
DEBUG(dbgs() << "argpromotion disable promoting argument '"
@ -205,7 +201,7 @@ CallGraphNode *ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
}
// Otherwise, see if we can promote the pointer to its value.
if (isSafeToPromoteArgument(PtrArg, isByVal))
if (isSafeToPromoteArgument(PtrArg, PtrArg->hasByValAttr()))
ArgsToPromote.insert(PtrArg);
}
@ -221,8 +217,7 @@ CallGraphNode *ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
static bool AllCallersPassInValidPointerForArgument(Argument *Arg) {
Function *Callee = Arg->getParent();
unsigned ArgNo = std::distance(Callee->arg_begin(),
Function::arg_iterator(Arg));
unsigned ArgNo = Arg->getArgNo();
// Look at all call sites of the function. At this pointer we know we only
// have direct callees.