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1 //===- lib/CodeGen/GlobalISel/LegalizerMutations.cpp - Mutations ----------===//
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 // A library of mutation factories to use for LegalityMutation.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
14
15 using namespace llvm;
16
17 LegalizeMutation LegalizeMutations::changeTo(unsigned TypeIdx, LLT Ty) {
18   return
19       [=](const LegalityQuery &Query) { return std::make_pair(TypeIdx, Ty); };
20 }
21
22 LegalizeMutation LegalizeMutations::changeTo(unsigned TypeIdx,
23                                              unsigned FromTypeIdx) {
24   return [=](const LegalityQuery &Query) {
25     return std::make_pair(TypeIdx, Query.Types[FromTypeIdx]);
26   };
27 }
28
29 LegalizeMutation LegalizeMutations::changeElementTo(unsigned TypeIdx,
30                                                     unsigned FromTypeIdx) {
31   return [=](const LegalityQuery &Query) {
32     const LLT OldTy = Query.Types[TypeIdx];
33     const LLT NewTy = Query.Types[FromTypeIdx];
34     return std::make_pair(TypeIdx, OldTy.changeElementType(NewTy));
35   };
36 }
37
38 LegalizeMutation LegalizeMutations::changeElementTo(unsigned TypeIdx,
39                                                     LLT NewEltTy) {
40   return [=](const LegalityQuery &Query) {
41     const LLT OldTy = Query.Types[TypeIdx];
42     return std::make_pair(TypeIdx, OldTy.changeElementType(NewEltTy));
43   };
44 }
45
46 LegalizeMutation LegalizeMutations::changeElementSizeTo(unsigned TypeIdx,
47                                                         unsigned FromTypeIdx) {
48   return [=](const LegalityQuery &Query) {
49     const LLT OldTy = Query.Types[TypeIdx];
50     const LLT NewTy = Query.Types[FromTypeIdx];
51     const LLT NewEltTy = LLT::scalar(NewTy.getScalarSizeInBits());
52     return std::make_pair(TypeIdx, OldTy.changeElementType(NewEltTy));
53   };
54 }
55
56 LegalizeMutation LegalizeMutations::widenScalarOrEltToNextPow2(unsigned TypeIdx,
57                                                                unsigned Min) {
58   return [=](const LegalityQuery &Query) {
59     const LLT Ty = Query.Types[TypeIdx];
60     unsigned NewEltSizeInBits =
61         std::max(1u << Log2_32_Ceil(Ty.getScalarSizeInBits()), Min);
62     return std::make_pair(TypeIdx, Ty.changeElementSize(NewEltSizeInBits));
63   };
64 }
65
66 LegalizeMutation
67 LegalizeMutations::widenScalarOrEltToNextMultipleOf(unsigned TypeIdx,
68                                                     unsigned Size) {
69   return [=](const LegalityQuery &Query) {
70     const LLT Ty = Query.Types[TypeIdx];
71     unsigned NewEltSizeInBits = alignTo(Ty.getScalarSizeInBits(), Size);
72     return std::make_pair(TypeIdx, Ty.changeElementSize(NewEltSizeInBits));
73   };
74 }
75
76 LegalizeMutation LegalizeMutations::moreElementsToNextPow2(unsigned TypeIdx,
77                                                            unsigned Min) {
78   return [=](const LegalityQuery &Query) {
79     const LLT VecTy = Query.Types[TypeIdx];
80     unsigned NewNumElements =
81         std::max(1u << Log2_32_Ceil(VecTy.getNumElements()), Min);
82     return std::make_pair(
83         TypeIdx, LLT::fixed_vector(NewNumElements, VecTy.getElementType()));
84   };
85 }
86
87 LegalizeMutation LegalizeMutations::scalarize(unsigned TypeIdx) {
88   return [=](const LegalityQuery &Query) {
89     return std::make_pair(TypeIdx, Query.Types[TypeIdx].getElementType());
90   };
91 }