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 { zeroRegisterValue27 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