mirror of https://github.com/llvm/torch-mlir
6b95dd461d
In constant folding progress, a new constant op will be created
according to the origin op's result type.
See the code in TorchDialect.cpp.
```cpp
Operation *TorchDialect::materializeConstant(OpBuilder &builder,
Attribute value, Type type,
Location loc) {
if (auto integerType = dyn_cast<Torch::IntType>(type))
return builder.create<Torch::ConstantIntOp>(loc, cast<IntegerAttr>(value));
if (auto floatType = dyn_cast<Torch::FloatType>(type))
return builder.create<Torch::ConstantFloatOp>(loc, cast<FloatAttr>(value));
if (auto numberType = dyn_cast<Torch::NumberType>(type)) {
if (auto floatValue = dyn_cast<mlir::FloatAttr>(value)) {
return builder.create<Torch::ConstantNumberOp>(loc, floatValue);
} else if (auto intValue = dyn_cast<mlir::IntegerAttr>(value)) {
return builder.create<Torch::ConstantNumberOp>(loc, intValue);
}
}
if (isa<Torch::BoolType>(type)) {
return builder.create<Torch::ConstantBoolOp>(loc, cast<IntegerAttr>(value));
}
if (isa<Torch::NoneType>(type))
return builder.create<ConstantNoneOp>(loc);
if (auto stringAttr = dyn_cast<StringAttr>(value))
return builder.create<ConstantStrOp>(loc, stringAttr);
if (auto elementsAttr = dyn_cast<ElementsAttr>(value)) {
// Only !torch.vtensor can be constant folded. !torch.tensor has
// non-trivial aliasing semantics which prevent deduplicating it.
assert(isa<ValueTensorType>(type) && "should be a vtensor type!");
return builder.create<ValueTensorLiteralOp>(loc, elementsAttr);
}
return nullptr;
}
```
So when the op has a tensor result type, it must be "ValueTensorType"
due to the **assert** statement. However, many fold methods in
TorchOps.cpp only have a judgment of "BaseTensorType".
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| .. | ||
| IR | ||
| Transforms | ||
| Utils | ||
| CMakeLists.txt | ||