lib/CodeGen/LowLevelType.cpp

   1 //===-- llvm/CodeGen/LowLevelType.cpp -------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 /// \file This file implements the more header-heavy bits of the LLT class to
  10 /// avoid polluting users' namespaces.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/LowLevelType.h"
  15 #include "llvm/IR/DataLayout.h"
  16 #include "llvm/IR/DerivedTypes.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 using namespace llvm;
  19
  20 LLT llvm::getLLTForType(Type &Ty, const DataLayout &DL) {
  21   if (auto VTy = dyn_cast<VectorType>(&Ty)) {
  22     auto NumElements = VTy->getNumElements();
  23     LLT ScalarTy = getLLTForType(*VTy->getElementType(), DL);
  24     if (NumElements == 1)
  25       return ScalarTy;
  26     return LLT::vector(NumElements, ScalarTy);
  27   } else if (auto PTy = dyn_cast<PointerType>(&Ty)) {
  28     return LLT::pointer(PTy->getAddressSpace(), DL.getTypeSizeInBits(&Ty));
  29   } else if (Ty.isSized()) {
  30     // Aggregates are no different from real scalars as far as GlobalISel is
  31     // concerned.
  32     auto SizeInBits = DL.getTypeSizeInBits(&Ty);
  33     assert(SizeInBits != 0 && "invalid zero-sized type");
  34     return LLT::scalar(SizeInBits);
  35   }
  36   return LLT();
  37 }