llvm/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/ADT/APFloat.h"
  16 #include "llvm/IR/DataLayout.h"
  17 #include "llvm/IR/DerivedTypes.h"
  18 #include "llvm/Support/raw_ostream.h"
  19 using namespace llvm;
  20
  21 LLT llvm::getLLTForType(Type &Ty, const DataLayout &DL) {
  22   if (auto VTy = dyn_cast<VectorType>(&Ty)) {
  23     auto EC = VTy->getElementCount();
  24     LLT ScalarTy = getLLTForType(*VTy->getElementType(), DL);
  25     if (EC.isScalar())
  26       return ScalarTy;
  27     return LLT::vector(EC, ScalarTy);
  28   }
  29
  30   if (auto PTy = dyn_cast<PointerType>(&Ty)) {
  31     unsigned AddrSpace = PTy->getAddressSpace();
  32     return LLT::pointer(AddrSpace, DL.getPointerSizeInBits(AddrSpace));
  33   }
  34
  35   if (Ty.isSized()) {
  36     // Aggregates are no different from real scalars as far as GlobalISel is
  37     // concerned.
  38     auto SizeInBits = DL.getTypeSizeInBits(&Ty);
  39     assert(SizeInBits != 0 && "invalid zero-sized type");
  40     return LLT::scalar(SizeInBits);
  41   }
  42
  43   return LLT();
  44 }
  45
  46 MVT llvm::getMVTForLLT(LLT Ty) {
  47   if (!Ty.isVector())
  48     return MVT::getIntegerVT(Ty.getSizeInBits());
  49
  50   return MVT::getVectorVT(
  51       MVT::getIntegerVT(Ty.getElementType().getSizeInBits()),
  52       Ty.getNumElements());
  53 }
  54
  55 EVT llvm::getApproximateEVTForLLT(LLT Ty, const DataLayout &DL,
  56                                   LLVMContext &Ctx) {
  57   if (Ty.isVector()) {
  58     EVT EltVT = getApproximateEVTForLLT(Ty.getElementType(), DL, Ctx);
  59     return EVT::getVectorVT(Ctx, EltVT, Ty.getElementCount());
  60   }
  61
  62   return EVT::getIntegerVT(Ctx, Ty.getSizeInBits());
  63 }
  64
  65 LLT llvm::getLLTForMVT(MVT Ty) {
  66   if (!Ty.isVector())
  67     return LLT::scalar(Ty.getSizeInBits());
  68
  69   return LLT::scalarOrVector(Ty.getVectorElementCount(),
  70                              Ty.getVectorElementType().getSizeInBits());
  71 }
  72
  73 const llvm::fltSemantics &llvm::getFltSemanticForLLT(LLT Ty) {
  74   assert(Ty.isScalar() && "Expected a scalar type.");
  75   switch (Ty.getSizeInBits()) {
  76   case 16:
  77     return APFloat::IEEEhalf();
  78   case 32:
  79     return APFloat::IEEEsingle();
  80   case 64:
  81     return APFloat::IEEEdouble();
  82   case 128:
  83     return APFloat::IEEEquad();
  84   }
  85   llvm_unreachable("Invalid FP type size.");
  86 }