tools/llvm-exegesis/lib/RegisterValue.h

   1 //===-- RegisterValue.h -----------------------------------------*- 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 /// \file
  11 ///
  12 /// Defines a Target independent value for a Register. This is useful to explore
  13 /// the influence of the instruction input values on its execution time.
  14 ///
  15 //===----------------------------------------------------------------------===//
  16
  17 #include <llvm/ADT/APFloat.h>
  18
  19 namespace exegesis {
  20
  21 enum class PredefinedValues {
  22   POS_ZERO,       // Positive zero
  23   NEG_ZERO,       // Negative zero
  24   ONE,            // 1.0
  25   TWO,            // 2.0
  26   INF,            // Infinity
  27   QNAN,           // Quiet NaN
  28   ULP,            // One Unit in the last place
  29   SMALLEST = ULP, // The minimum subnormal number
  30   SMALLEST_NORM,  // The minimum normal number
  31   LARGEST,        // The maximum normal number
  32   ONE_PLUS_ULP,   // The value just after 1.0
  33 };
  34
  35 llvm::APInt bitcastFloatValue(const llvm::fltSemantics &FltSemantics,
  36                               PredefinedValues Value);
  37
  38 } // namespace exegesis