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 #include <llvm/MC/MCRegister.h> 22 23 namespace llvm { 24 namespace exegesis { 25 26 // A simple object storing the value for a particular register. 27 struct RegisterValue { 28 static RegisterValue zero(MCRegister Reg) { return {Reg, APInt()}; } 29 MCRegister Register; 30 APInt Value; 31 }; 32 33 enum class PredefinedValues { 34 POS_ZERO, // Positive zero 35 NEG_ZERO, // Negative zero 36 ONE, // 1.0 37 TWO, // 2.0 38 INF, // Infinity 39 QNAN, // Quiet NaN 40 ULP, // One Unit in the last place 41 SMALLEST = ULP, // The minimum subnormal number 42 SMALLEST_NORM, // The minimum normal number 43 LARGEST, // The maximum normal number 44 ONE_PLUS_ULP, // The value just after 1.0 45 }; 46 47 APInt bitcastFloatValue(const fltSemantics &FltSemantics, 48 PredefinedValues Value); 49 50 } // namespace exegesis 51 } // namespace llvm 52 53 #endif // LLVM_TOOLS_LLVM_EXEGESIS_REGISTERVALUE_H 54