lib/CodeGen/GlobalISel/LegalizeMutations.cpp

   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::changeTo(unsigned TypeIdx,
  24                                              unsigned FromTypeIdx) {
  25   return [=](const LegalityQuery &Query) {
  26     return std::make_pair(TypeIdx, Query.Types[FromTypeIdx]);
  27   };
  28 }
  29
  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
  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 }