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enhance some optimization logic to handle ConstantDataSequential

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as well as ConstantArray.

llvm-svn: 149347
This commit is contained in:
Chris Lattner
2012-01-31 04:36:19 +00:00
parent ef496d5c4d
commit 236b357361
1 changed files with 26 additions and 9 deletions
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35
clang/lib/CodeGen/CGDecl.cpp
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@@ -644,6 +644,16 @@ static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init,
}
return true;
}
if (llvm::ConstantDataSequential *CDS =
dyn_cast<llvm::ConstantDataSequential>(Init)) {
for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
llvm::Constant *Elt = CDS->getElementAsConstant(i);
if (!canEmitInitWithFewStoresAfterMemset(Elt, NumStores))
return false;
}
return true;
}
// Anything else is hard and scary.
return false;
@@ -654,17 +664,26 @@ static bool canEmitInitWithFewStoresAfterMemset(llvm::Constant *Init,
/// stores that would be required.
static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc,
bool isVolatile, CGBuilderTy &Builder) {
// Zero doesn't require any stores.
if (isa<llvm::ConstantAggregateZero>(Init) ||
isa<llvm::ConstantPointerNull>(Init) ||
isa<llvm::UndefValue>(Init))
// Zero doesn't require a store.
if (Init->isNullValue() || isa<llvm::UndefValue>(Init))
return;
if (isa<llvm::ConstantInt>(Init) || isa<llvm::ConstantFP>(Init) ||
isa<llvm::ConstantVector>(Init) || isa<llvm::BlockAddress>(Init) ||
isa<llvm::ConstantExpr>(Init)) {
if (!Init->isNullValue())
Builder.CreateStore(Init, Loc, isVolatile);
Builder.CreateStore(Init, Loc, isVolatile);
return;
}
if (llvm::ConstantDataSequential *CDS =
dyn_cast<llvm::ConstantDataSequential>(Init)) {
for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
llvm::Constant *Elt = CDS->getElementAsConstant(i);
// Get a pointer to the element and emit it.
emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i),
isVolatile, Builder);
}
return;
}
@@ -673,9 +692,7 @@ static void emitStoresForInitAfterMemset(llvm::Constant *Init, llvm::Value *Loc,
for (unsigned i = 0, e = Init->getNumOperands(); i != e; ++i) {
llvm::Constant *Elt = cast<llvm::Constant>(Init->getOperand(i));
if (Elt->isNullValue()) continue;
// Otherwise, get a pointer to the element and emit it.
// Get a pointer to the element and emit it.
emitStoresForInitAfterMemset(Elt, Builder.CreateConstGEP2_32(Loc, 0, i),
isVolatile, Builder);
}