1 //===-- llvm/CodeGen/LowLevelTypeUtils.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/LowLevelTypeUtils.h"
15 #include "llvm/ADT/APFloat.h"
16 #include "llvm/IR/DataLayout.h"
17 #include "llvm/IR/DerivedTypes.h"
18 using namespace llvm;
19
getLLTForType(Type & Ty,const DataLayout & DL)20 LLT llvm::getLLTForType(Type &Ty, const DataLayout &DL) {
21 if (auto VTy = dyn_cast<VectorType>(&Ty)) {
22 auto EC = VTy->getElementCount();
23 LLT ScalarTy = getLLTForType(*VTy->getElementType(), DL);
24 if (EC.isScalar())
25 return ScalarTy;
26 return LLT::vector(EC, 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() && !Ty.isScalableTargetExtTy()) {
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 if (Ty.isTokenTy())
43 return LLT::token();
44
45 return LLT();
46 }
47
getMVTForLLT(LLT Ty)48 MVT llvm::getMVTForLLT(LLT Ty) {
49 if (!Ty.isVector())
50 return MVT::getIntegerVT(Ty.getSizeInBits());
51
52 return MVT::getVectorVT(
53 MVT::getIntegerVT(Ty.getElementType().getSizeInBits()),
54 Ty.getElementCount());
55 }
56
getApproximateEVTForLLT(LLT Ty,const DataLayout & DL,LLVMContext & Ctx)57 EVT llvm::getApproximateEVTForLLT(LLT Ty, const DataLayout &DL,
58 LLVMContext &Ctx) {
59 if (Ty.isVector()) {
60 EVT EltVT = getApproximateEVTForLLT(Ty.getElementType(), DL, Ctx);
61 return EVT::getVectorVT(Ctx, EltVT, Ty.getElementCount());
62 }
63
64 return EVT::getIntegerVT(Ctx, Ty.getSizeInBits());
65 }
66
getLLTForMVT(MVT Ty)67 LLT llvm::getLLTForMVT(MVT Ty) {
68 if (!Ty.isVector())
69 return LLT::scalar(Ty.getSizeInBits());
70
71 return LLT::scalarOrVector(Ty.getVectorElementCount(),
72 Ty.getVectorElementType().getSizeInBits());
73 }
74
getFltSemanticForLLT(LLT Ty)75 const llvm::fltSemantics &llvm::getFltSemanticForLLT(LLT Ty) {
76 assert(Ty.isScalar() && "Expected a scalar type.");
77 switch (Ty.getSizeInBits()) {
78 case 16:
79 return APFloat::IEEEhalf();
80 case 32:
81 return APFloat::IEEEsingle();
82 case 64:
83 return APFloat::IEEEdouble();
84 case 128:
85 return APFloat::IEEEquad();
86 }
87 llvm_unreachable("Invalid FP type size.");
88 }
89