tools/llvm-exegesis/lib/RegisterValue.cpp

   1 //===-- RegisterValue.cpp ---------------------------------------*- C++ -*-===//
   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 #include "RegisterValue.h"
  11 #include "llvm/ADT/APFloat.h"
  12
  13 namespace llvm {
  14 namespace exegesis {
  15
  16 static llvm::APFloat getFloatValue(const llvm::fltSemantics &FltSemantics,
  17                                    PredefinedValues Value) {
  18   switch (Value) {
  19   case PredefinedValues::POS_ZERO:
  20     return llvm::APFloat::getZero(FltSemantics);
  21   case PredefinedValues::NEG_ZERO:
  22     return llvm::APFloat::getZero(FltSemantics, true);
  23   case PredefinedValues::ONE:
  24     return llvm::APFloat(FltSemantics, "1");
  25   case PredefinedValues::TWO:
  26     return llvm::APFloat(FltSemantics, "2");
  27   case PredefinedValues::INF:
  28     return llvm::APFloat::getInf(FltSemantics);
  29   case PredefinedValues::QNAN:
  30     return llvm::APFloat::getQNaN(FltSemantics);
  31   case PredefinedValues::SMALLEST_NORM:
  32     return llvm::APFloat::getSmallestNormalized(FltSemantics);
  33   case PredefinedValues::LARGEST:
  34     return llvm::APFloat::getLargest(FltSemantics);
  35   case PredefinedValues::ULP:
  36     return llvm::APFloat::getSmallest(FltSemantics);
  37   case PredefinedValues::ONE_PLUS_ULP:
  38     auto Output = getFloatValue(FltSemantics, PredefinedValues::ONE);
  39     Output.next(false);
  40     return Output;
  41   }
  42   llvm_unreachable("Unhandled exegesis::PredefinedValues");
  43 }
  44
  45 llvm::APInt bitcastFloatValue(const llvm::fltSemantics &FltSemantics,
  46                               PredefinedValues Value) {
  47   return getFloatValue(FltSemantics, Value).bitcastToAPInt();
  48 }
  49
  50 } // namespace exegesis
  51 } // namespace llvm