1 // -*- C++ -*-
2 //===-- transform_reduce.pass.cpp -----------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // UNSUPPORTED: c++03, c++11, c++14
11 
12 #include "support/pstl_test_config.h"
13 
14 #include <execution>
15 #include <numeric>
16 
17 #include "support/utils.h"
18 
19 using namespace TestUtils;
20 
21 // Functor for xor-operation for modeling binary operations in inner_product
22 class XOR
23 {
24   public:
25     template <typename T>
26     T
27     operator()(const T& left, const T& right) const
28     {
29         return left ^ right;
30     }
31 };
32 
33 // Model of User-defined class
34 class MyClass
35 {
36   public:
37     int32_t my_field;
38     MyClass() { my_field = 0; }
39     MyClass(int32_t in) { my_field = in; }
40     MyClass(const MyClass& in) { my_field = in.my_field; }
41 
42     friend MyClass
43     operator+(const MyClass& x, const MyClass& y)
44     {
45         return MyClass(x.my_field + y.my_field);
46     }
47     friend MyClass
48     operator-(const MyClass& x)
49     {
50         return MyClass(-x.my_field);
51     }
52     friend MyClass operator*(const MyClass& x, const MyClass& y)
53     {
54         return MyClass(x.my_field * y.my_field);
55     }
56     friend bool operator==(const MyClass& x, const MyClass& y)
57     {
58         return x.my_field == y.my_field;
59     }
60 };
61 
62 template <typename T>
63 void
64 CheckResults(const T& expected, const T& in)
65 {
66     EXPECT_TRUE(expected == in, "wrong result of transform_reduce");
67 }
68 
69 // We need to check correctness only for "int" (for example) except cases
70 // if we have "floating-point type"-specialization
71 void
72 CheckResults(const float32_t&, const float32_t&)
73 {
74 }
75 
76 // Test for different types and operations with different iterators
77 struct test_transform_reduce
78 {
79     template <typename Policy, typename InputIterator1, typename InputIterator2, typename T, typename BinaryOperation1,
80               typename BinaryOperation2, typename UnaryOp>
81     void
82     operator()(Policy&& exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2,
83                T init, BinaryOperation1 opB1, BinaryOperation2 opB2, UnaryOp opU)
84     {
85 
86         auto expectedB = std::inner_product(first1, last1, first2, init, opB1, opB2);
87         auto expectedU = transform_reduce_serial(first1, last1, init, opB1, opU);
88         T resRA = std::transform_reduce(exec, first1, last1, first2, init, opB1, opB2);
89         CheckResults(expectedB, resRA);
90         resRA = std::transform_reduce(exec, first1, last1, init, opB1, opU);
91         CheckResults(expectedU, resRA);
92     }
93 };
94 
95 template <typename T, typename BinaryOperation1, typename BinaryOperation2, typename UnaryOp, typename Initializer>
96 void
97 test_by_type(T init, BinaryOperation1 opB1, BinaryOperation2 opB2, UnaryOp opU, Initializer initObj)
98 {
99 
100     std::size_t maxSize = 100000;
101     Sequence<T> in1(maxSize, initObj);
102     Sequence<T> in2(maxSize, initObj);
103 
104     for (std::size_t n = 0; n < maxSize; n = n < 16 ? n + 1 : size_t(3.1415 * n))
105     {
106         invoke_on_all_policies(test_transform_reduce(), in1.begin(), in1.begin() + n, in2.begin(), in2.begin() + n,
107                                init, opB1, opB2, opU);
108         invoke_on_all_policies(test_transform_reduce(), in1.cbegin(), in1.cbegin() + n, in2.cbegin(), in2.cbegin() + n,
109                                init, opB1, opB2, opU);
110     }
111 }
112 
113 int
114 main()
115 {
116     test_by_type<int32_t>(42, std::plus<int32_t>(), std::multiplies<int32_t>(), std::negate<int32_t>(),
117                           [](std::size_t) -> int32_t { return int32_t(rand() % 1000); });
118     test_by_type<int64_t>(0, [](const int64_t& a, const int64_t& b) -> int64_t { return a | b; }, XOR(),
119                           [](const int64_t& x) -> int64_t { return x * 2; },
120                           [](std::size_t) -> int64_t { return int64_t(rand() % 1000); });
121     test_by_type<float32_t>(
122         1.0f, std::multiplies<float32_t>(), [](const float32_t& a, const float32_t& b) -> float32_t { return a + b; },
123         [](const float32_t& x) -> float32_t { return x + 2; }, [](std::size_t) -> float32_t { return rand() % 1000; });
124     test_by_type<MyClass>(MyClass(), std::plus<MyClass>(), std::multiplies<MyClass>(), std::negate<MyClass>(),
125                           [](std::size_t) -> MyClass { return MyClass(rand() % 1000); });
126 
127     std::cout << done() << std::endl;
128     return 0;
129 }
130