static MDNode *createMetadata(LLVMContext &Ctx, const LoopAttributes &Attrs) {
if (!Attrs.IsParallel && Attrs.VectorizerWidth == 0 &&
Attrs.VectorizerUnroll == 0 &&
Attrs.VectorizerEnable == LoopAttributes::VecUnspecified)
return nullptr;
SmallVector<Value *, 4> Args;
// Reserve operand 0 for loop id self reference.
MDNode *TempNode = MDNode::getTemporary(Ctx, None);
Args.push_back(TempNode);
// Setting vectorizer.width
if (Attrs.VectorizerWidth > 0) {
Value *Vals[] = { MDString::get(Ctx, "llvm.loop.vectorize.width"),
ConstantInt::get(Type::getInt32Ty(Ctx),
Attrs.VectorizerWidth) };
Args.push_back(MDNode::get(Ctx, Vals));
}
// Setting vectorizer.unroll
if (Attrs.VectorizerUnroll > 0) {
Value *Vals[] = { MDString::get(Ctx, "llvm.loop.interleave.count"),
ConstantInt::get(Type::getInt32Ty(Ctx),
Attrs.VectorizerUnroll) };
Args.push_back(MDNode::get(Ctx, Vals));
}
// Setting vectorizer.enable
if (Attrs.VectorizerEnable != LoopAttributes::VecUnspecified) {
Value *Vals[] = { MDString::get(Ctx, "llvm.loop.vectorize.enable"),
ConstantInt::get(Type::getInt1Ty(Ctx),
(Attrs.VectorizerEnable ==
LoopAttributes::VecEnable)) };
Args.push_back(MDNode::get(Ctx, Vals));
}
MDNode *LoopID = MDNode::get(Ctx, Args);
assert(LoopID->use_empty() && "LoopID should not be used");
// Set the first operand to itself.
LoopID->replaceOperandWith(0, LoopID);
MDNode::deleteTemporary(TempNode);
return LoopID;
}
