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
22namespace llvm {
23namespace exegesis {
24
25// A simple object storing the value for a particular register.
26struct RegisterValue {
27 static RegisterValue zero(unsigned Reg) { return {.Register: Reg, .Value: APInt()}; }
28 unsigned Register;
29 APInt Value;
30};
31
32enum 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
46APInt bitcastFloatValue(const fltSemantics &FltSemantics,
47 PredefinedValues Value);
48
49} // namespace exegesis
50} // namespace llvm
51
52#endif // LLVM_TOOLS_LLVM_EXEGESIS_REGISTERVALUE_H
53