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One more opportunity to do better broadcast

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This commit is contained in:
Dmitry Babokin
2013-04-17 20:56:32 +04:00
parent 5d64d23b61
commit cb650d6100
1 changed files with 17 additions and 11 deletions
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28
opt.cpp
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@@ -2457,18 +2457,24 @@ lGSToLoadStore(llvm::CallInst *callInst) {
ptr = new llvm::BitCastInst(ptr, llvm::PointerType::get(gatherInfo->scalarType, 0),
ptr->getName(), callInst);
llvm::Value *scalarValue = new llvm::LoadInst(ptr, callInst->getName(), callInst);
llvm::Value *vecValue = llvm::UndefValue::get(callInst->getType());
for (int i = 0; i < g->target->getVectorWidth(); ++i) {
if (i < g->target->getVectorWidth() - 1)
vecValue = llvm::InsertElementInst::Create(vecValue, scalarValue, LLVMInt32(i),
callInst->getName(), callInst);
else
vecValue = llvm::InsertElementInst::Create(vecValue, scalarValue, LLVMInt32(i),
callInst->getName());
}
lCopyMetadata(vecValue, callInst);
// Generate the follwoing sequence:
// %name_init.i = insertelement <4 x i32> undef, i32 %val, i32 0
// %name.i = shufflevector <4 x i32> %smear.0, <4 x i32> undef,
// <4 x i32> zeroinitializer
llvm::Value *undef1Value = llvm::UndefValue::get(callInst->getType());
llvm::Value *undef2Value = llvm::UndefValue::get(callInst->getType());
llvm::Value *insertVec = llvm::InsertElementInst::Create(
undef1Value, scalarValue, LLVMInt32(0), callInst->getName(), callInst);
llvm::Value *zeroMask = llvm::ConstantVector::getSplat(
callInst->getType()->getVectorNumElements(),
llvm::Constant::getNullValue(llvm::Type::getInt32Ty(*g->ctx)));
llvm::Value *shufValue = new llvm::ShuffleVectorInst(
insertVec, undef2Value, zeroMask, callInst->getName());
lCopyMetadata(shufValue, callInst);
llvm::ReplaceInstWithInst(callInst,
llvm::dyn_cast<llvm::Instruction>(vecValue));
llvm::dyn_cast<llvm::Instruction>(shufValue));
return true;
}
else {