include/llvm/Transforms/Scalar/Float2Int.h

   1 //===-- Float2Int.h - Demote floating point ops to work on integers -------===//
   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 // This file provides the Float2Int pass, which aims to demote floating
  10 // point operations to work on integers, where that is losslessly possible.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
  15 #define LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
  16
  17 #include "llvm/ADT/EquivalenceClasses.h"
  18 #include "llvm/ADT/MapVector.h"
  19 #include "llvm/IR/ConstantRange.h"
  20 #include "llvm/IR/Function.h"
  21 #include "llvm/IR/PassManager.h"
  22
  23 namespace llvm {
  24 class Float2IntPass : public PassInfoMixin<Float2IntPass> {
  25 public:
  26   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
  27
  28   // Glue for old PM.
  29   bool runImpl(Function &F);
  30
  31 private:
  32   void findRoots(Function &F, SmallPtrSet<Instruction *, 8> &Roots);
  33   void seen(Instruction *I, ConstantRange R);
  34   ConstantRange badRange();
  35   ConstantRange unknownRange();
  36   ConstantRange validateRange(ConstantRange R);
  37   void walkBackwards(const SmallPtrSetImpl<Instruction *> &Roots);
  38   void walkForwards();
  39   bool validateAndTransform();
  40   Value *convert(Instruction *I, Type *ToTy);
  41   void cleanup();
  42
  43   MapVector<Instruction *, ConstantRange> SeenInsts;
  44   SmallPtrSet<Instruction *, 8> Roots;
  45   EquivalenceClasses<Instruction *> ECs;
  46   MapVector<Instruction *, Value *> ConvertedInsts;
  47   LLVMContext *Ctx;
  48 };
  49 }
  50 #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H