LowLevelType.cpp

//===-- llvm/CodeGen/LowLevelType.cpp -------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file This file implements the more header-heavy bits of the LLT class to
/// avoid polluting users' namespaces.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/LowLevelType.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

LLT llvm::getLLTForType(Type &Ty, const DataLayout &DL) {
  if (auto VTy = dyn_cast<VectorType>(&Ty)) {
    auto NumElements = VTy->getNumElements();
    auto ScalarSizeInBits = VTy->getElementType()->getPrimitiveSizeInBits();
    if (NumElements == 1)
      return LLT::scalar(ScalarSizeInBits);
    return LLT::vector(NumElements, ScalarSizeInBits);
  } else if (auto PTy = dyn_cast<PointerType>(&Ty)) {
    return LLT::pointer(PTy->getAddressSpace(), DL.getTypeSizeInBits(&Ty));
  } else if (Ty.isSized()) {
    // Aggregates are no different from real scalars as far as GlobalISel is
    // concerned.
    auto SizeInBits = DL.getTypeSizeInBits(&Ty);
    assert(SizeInBits != 0 && "invalid zero-sized type");
    return LLT::scalar(SizeInBits);
  }
  return LLT();
}