Home | History | Annotate | Line # | Download | only in CodeGen 
      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 NumElements = cast<FixedVectorType>(VTy)->getNumElements();
     24     LLT ScalarTy = getLLTForType(*VTy->getElementType(), DL);
     25     if (NumElements == 1)
     26       return ScalarTy;
     27     return LLT::vector(NumElements, 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 LLT llvm::getLLTForMVT(MVT Ty) {
     56   if (!Ty.isVector())
     57     return LLT::scalar(Ty.getSizeInBits());
     58 
     59   return LLT::vector(Ty.getVectorNumElements(),
     60                      Ty.getVectorElementType().getSizeInBits());
     61 }
     62 
     63 const llvm::fltSemantics &llvm::getFltSemanticForLLT(LLT Ty) {
     64   assert(Ty.isScalar() && "Expected a scalar type.");
     65   switch (Ty.getSizeInBits()) {
     66   case 16:
     67     return APFloat::IEEEhalf();
     68   case 32:
     69     return APFloat::IEEEsingle();
     70   case 64:
     71     return APFloat::IEEEdouble();
     72   case 128:
     73     return APFloat::IEEEquad();
     74   }
     75   llvm_unreachable("Invalid FP type size.");
     76 }
     77