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      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, APInt()}; }
     28   unsigned Register;
     29   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 APInt bitcastFloatValue(const fltSemantics &FltSemantics,
     47                         PredefinedValues Value);
     48 
     49 } // namespace exegesis
     50 } // namespace llvm
     51 
     52 #endif // LLVM_TOOLS_LLVM_EXEGESIS_REGISTERVALUE_H
     53