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 
18 LegalizeMutation LegalizeMutations::changeTo(unsigned TypeIdx, LLT Ty) {
19   return
20       [=](const LegalityQuery &Query) { return std::make_pair(TypeIdx, Ty); };
21 }
22 
23 LegalizeMutation LegalizeMutations::widenScalarToNextPow2(unsigned TypeIdx,
24                                                           unsigned Min) {
25   return [=](const LegalityQuery &Query) {
26     unsigned NewSizeInBits =
27         1 << Log2_32_Ceil(Query.Types[TypeIdx].getSizeInBits());
28     if (NewSizeInBits < Min)
29       NewSizeInBits = Min;
30     return std::make_pair(TypeIdx, LLT::scalar(NewSizeInBits));
31   };
32 }
33 
34 LegalizeMutation LegalizeMutations::moreElementsToNextPow2(unsigned TypeIdx,
35                                                            unsigned Min) {
36   return [=](const LegalityQuery &Query) {
37     const LLT &VecTy = Query.Types[TypeIdx];
38     unsigned NewNumElements = 1 << Log2_32_Ceil(VecTy.getNumElements());
39     if (NewNumElements < Min)
40       NewNumElements = Min;
41     return std::make_pair(
42         TypeIdx, LLT::vector(NewNumElements, VecTy.getScalarSizeInBits()));
43   };
44 }
45