tools/llvm-exegesis/lib/RegisterValue.h

   1 //===-- RegisterValue.h -----------------------------------------*- C++ -*-===//
   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 /// \file
  10 ///
  11 /// Defines a Target independent value for a Register. This is useful to explore
  12 /// the influence of the instruction input values on its execution time.
  13 ///
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef LLVM_TOOLS_LLVM_EXEGESIS_REGISTERVALUE_H
  17 #define LLVM_TOOLS_LLVM_EXEGESIS_REGISTERVALUE_H
  18
  19 #include <llvm/ADT/APFloat.h>
  20 #include <llvm/ADT/APInt.h>
  21
  22 namespace llvm {
  23 namespace exegesis {
  24
  25 // A simple object storing the value for a particular register.
  26 struct RegisterValue {
  27   static RegisterValue zero(unsigned Reg) { return {Reg, llvm::APInt()}; }
  28   unsigned Register;
  29   llvm::APInt Value;
  30 };
  31
  32 enum class PredefinedValues {
  33   POS_ZERO,       // Positive zero
  34   NEG_ZERO,       // Negative zero
  35   ONE,            // 1.0
  36   TWO,            // 2.0
  37   INF,            // Infinity
  38   QNAN,           // Quiet NaN
  39   ULP,            // One Unit in the last place
  40   SMALLEST = ULP, // The minimum subnormal number
  41   SMALLEST_NORM,  // The minimum normal number
  42   LARGEST,        // The maximum normal number
  43   ONE_PLUS_ULP,   // The value just after 1.0
  44 };
  45
  46 llvm::APInt bitcastFloatValue(const llvm::fltSemantics &FltSemantics,
  47                               PredefinedValues Value);
  48
  49 } // namespace exegesis
  50 } // namespace llvm
  51
  52 #endif // LLVM_TOOLS_LLVM_EXEGESIS_REGISTERVALUE_H