src/gromacs/utility/tests/alignedallocator-impl.h

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  35 /*! \libinternal \file
  36  * \brief Tests for allocators that offer a minimum alignment.
  37  *
  38  * This implementation header can be included in multiple modules
  39  * tests, which is currently needed because gpu_utils is physically
  40  * separate from the utility module.
  41  *
  42  * \author Erik Lindahl <erik.lindahl@gmail.com>
  43  * \author Mark Abraham <mark.j.abraham@gmail.com>
  44  * \inlibraryapi
  45  * \ingroup module_utility
  46  */
  47 #ifndef GMX_UTILITY_TESTS_ALIGNEDALLOCATOR_IMPL_H
  48 #define GMX_UTILITY_TESTS_ALIGNEDALLOCATOR_IMPL_H
  49
  50 #include <cstddef>
  51
  52 #include <vector>
  53
  54 #include <gtest/gtest.h>
  55
  56 #include "gromacs/math/vectypes.h"
  57 #include "gromacs/utility/real.h"
  58
  59 namespace gmx
  60 {
  61 namespace test
  62 {
  63
  64 /*! \libinternal
  65  * \brief Templated test fixture. */
  66 template <typename T>
  67 class AllocatorTest : public ::testing::Test
  68 {
  69     public:
  70         /*! \brief Return a bitmask for testing the alignment.
  71          *
  72          * e.g. for 128-byte alignment the mask is 128-1 - all of
  73          * these bits should be zero in pointers that have the
  74          * intended alignment. */
  75         std::size_t mask(const T &allocator)
  76         {
  77             return allocator.getPolicy().alignment() - 1;
  78         }
  79 };
  80
  81 // NB need to use this->mask() because of GoogleTest quirks
  82
  83 TYPED_TEST(AllocatorTest, AllocatorAlignAllocatesWithAlignment)
  84 {
  85     using pointer = typename TypeParam::pointer;
  86     TypeParam a;
  87     pointer   p = a.allocate(1000);
  88
  89     EXPECT_EQ(0, reinterpret_cast<std::size_t>(p) & this->mask(a));
  90     a.deallocate(p, 1000);
  91 }
  92
  93
  94 TYPED_TEST(AllocatorTest, VectorAllocatesAndResizesWithAlignment)
  95 {
  96     using value_type = typename TypeParam::value_type;
  97     std::vector<value_type, TypeParam> v(10);
  98     EXPECT_EQ(0, reinterpret_cast<std::size_t>(v.data()) & this->mask(v.get_allocator()));
  99
 100     // Reserve a few times to check things work ok, making sure we
 101     // will trigger several reallocations on common vector
 102     // implementations.
 103     for (std::size_t i = 1000; i <= 10000; i += 1000)
 104     {
 105         v.resize(i);
 106         EXPECT_EQ(0, reinterpret_cast<std::size_t>(v.data()) & this->mask(v.get_allocator()));
 107     }
 108 }
 109
 110 TYPED_TEST(AllocatorTest, VectorAllocatesAndReservesWithAlignment)
 111 {
 112     using value_type = typename TypeParam::value_type;
 113     std::vector<value_type, TypeParam> v(10);
 114     EXPECT_EQ(0, reinterpret_cast<std::size_t>(v.data()) & this->mask(v.get_allocator()));
 115
 116     // Reserve a few times to check things work ok, making sure we
 117     // will trigger several reallocations on common vector
 118     // implementations.
 119     for (std::size_t i = 1000; i <= 10000; i += 1000)
 120     {
 121         v.reserve(i);
 122         EXPECT_EQ(0, reinterpret_cast<std::size_t>(v.data()) & this->mask(v.get_allocator()));
 123     }
 124 }
 125
 126 } // namespace
 127 } // namespace
 128
 129 #endif