1/*
2 * Copyright (c) 2016 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated

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43#include <type_traits>
44
45#include "arch/generic/types.hh"
46#include "arch/generic/vec_reg.hh"
47
48class InstResult {
49 using VecRegContainer = TheISA::VecRegContainer;
50 using VecElem = TheISA::VecElem;
51 public:
52 union MultiResult {
53 uint64_t integer;
54 double dbl;
55 VecRegContainer vector;
56 VecElem vecElem;
57 MultiResult() {}
58 };
59
60 enum class ResultType {
61 Scalar,
62 VecElem,
63 VecReg,
64 NumResultTypes,
65 Invalid
66 };
67
68 private:
69 MultiResult result;
70 ResultType type;
71

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82 result.integer = i;
83 } else if (std::is_floating_point<T>::value) {
84 result.dbl = i;
85 }
86 }
87 /** Vector result. */
88 explicit InstResult(const VecRegContainer& v, const ResultType& t)
89 : type(t) { result.vector = v; }
90
91 InstResult& operator=(const InstResult& that) {
92 type = that.type;
93 switch (type) {
94 /* Given that misc regs are not written to, there may be invalids in
95 * the result stack. */
96 case ResultType::Invalid:
97 break;
98 case ResultType::Scalar:
99 result.integer = that.result.integer;
100 break;
101 case ResultType::VecElem:
102 result.vecElem = that.result.vecElem;
103 break;
104 case ResultType::VecReg:
105 result.vector = that.result.vector;
106 break;
107 default:
108 panic("Assigning result from unknown result type");
109 break;
110 }
111 return *this;
112 }
113 /**
114 * Result comparison

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119 return false;
120 switch (type) {
121 case ResultType::Scalar:
122 return result.integer == that.result.integer;
123 case ResultType::VecElem:
124 return result.vecElem == that.result.vecElem;
125 case ResultType::VecReg:
126 return result.vector == that.result.vector;
127 case ResultType::Invalid:
128 return false;
129 default:
130 panic("Unknown type of result: %d\n", (int)type);
131 }
132 }
133
134 bool operator!=(const InstResult& that) const {
135 return !operator==(that);
136 }
137
138 /** Checks */
139 /** @{ */
140 /** Is this a scalar result?. */
141 bool isScalar() const { return type == ResultType::Scalar; }
142 /** Is this a vector result?. */
143 bool isVector() const { return type == ResultType::VecReg; }
144 /** Is this a vector element result?. */
145 bool isVecElem() const { return type == ResultType::VecElem; }
146 /** Is this a valid result?. */
147 bool isValid() const { return type != ResultType::Invalid; }
148 /** @} */
149
150 /** Explicit cast-like operations. */
151 /** @{ */
152 const uint64_t&
153 asInteger() const

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172 return result.vector;
173 }
174 const VecElem&
175 asVectorElem() const
176 {
177 panic_if(!isVecElem(), "Converting scalar (or invalid) to vector!!");
178 return result.vecElem;
179 }
180 /** @} */
181};
182
183#endif // __CPU_INST_RES_HH__