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1 //===- lib/CodeGen/GlobalISel/LegalizerMutations.cpp - Mutations ----------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // A library of mutation factories to use for LegalityMutation.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
15 
16 using namespace llvm;
17 
changeTo(unsigned TypeIdx,LLT Ty)18 LegalizeMutation LegalizeMutations::changeTo(unsigned TypeIdx, LLT Ty) {
19   return
20       [=](const LegalityQuery &Query) { return std::make_pair(TypeIdx, Ty); };
21 }
22 
changeTo(unsigned TypeIdx,unsigned FromTypeIdx)23 LegalizeMutation LegalizeMutations::changeTo(unsigned TypeIdx,
24                                              unsigned FromTypeIdx) {
25   return [=](const LegalityQuery &Query) {
26     return std::make_pair(TypeIdx, Query.Types[FromTypeIdx]);
27   };
28 }
29 
widenScalarToNextPow2(unsigned TypeIdx,unsigned Min)30 LegalizeMutation LegalizeMutations::widenScalarToNextPow2(unsigned TypeIdx,
31                                                           unsigned Min) {
32   return [=](const LegalityQuery &Query) {
33     unsigned NewSizeInBits =
34         1 << Log2_32_Ceil(Query.Types[TypeIdx].getSizeInBits());
35     if (NewSizeInBits < Min)
36       NewSizeInBits = Min;
37     return std::make_pair(TypeIdx, LLT::scalar(NewSizeInBits));
38   };
39 }
40 
moreElementsToNextPow2(unsigned TypeIdx,unsigned Min)41 LegalizeMutation LegalizeMutations::moreElementsToNextPow2(unsigned TypeIdx,
42                                                            unsigned Min) {
43   return [=](const LegalityQuery &Query) {
44     const LLT &VecTy = Query.Types[TypeIdx];
45     unsigned NewNumElements = 1 << Log2_32_Ceil(VecTy.getNumElements());
46     if (NewNumElements < Min)
47       NewNumElements = Min;
48     return std::make_pair(
49         TypeIdx, LLT::vector(NewNumElements, VecTy.getScalarSizeInBits()));
50   };
51 }
52