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   }
28 
29   if (auto PTy = dyn_cast<PointerType>(&Ty)) {
30     unsigned AddrSpace = PTy->getAddressSpace();
31     return LLT::pointer(AddrSpace, DL.getPointerSizeInBits(AddrSpace));
32   }
33 
34   if (Ty.isSized()) {
35     // Aggregates are no different from real scalars as far as GlobalISel is
36     // concerned.
37     auto SizeInBits = DL.getTypeSizeInBits(&Ty);
38     assert(SizeInBits != 0 && "invalid zero-sized type");
39     return LLT::scalar(SizeInBits);
40   }
41 
42   return LLT();
43 }
44 
45 MVT llvm::getMVTForLLT(LLT Ty) {
46   if (!Ty.isVector())
47     return MVT::getIntegerVT(Ty.getSizeInBits());
48 
49   return MVT::getVectorVT(
50       MVT::getIntegerVT(Ty.getElementType().getSizeInBits()),
51       Ty.getNumElements());
52 }
53 
54 LLT llvm::getLLTForMVT(MVT Ty) {
55   if (!Ty.isVector())
56     return LLT::scalar(Ty.getSizeInBits());
57 
58   return LLT::vector(Ty.getVectorNumElements(),
59                      Ty.getVectorElementType().getSizeInBits());
60 }
61