src/gromacs/simd/tests/bootstrap_loadstore.cpp

   1 /*
   2  * This file is part of the GROMACS molecular simulation package.
   3  *
   4  * Copyright (c) 2014,2015,2017,2018, by the GROMACS development team, led by
   5  * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
   6  * and including many others, as listed in the AUTHORS file in the
   7  * top-level source directory and at http://www.gromacs.org.
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  35 #include "gmxpre.h"
  36
  37 /*! \internal \file
  38  * \brief
  39  * Separate test of SIMD load/store, before we use them in the SIMD test classes.
  40  *
  41  * Simple tests without using any classes/utilities, so we can use load/store
  42  * functions inside our test utilities after this has passed.
  43  *
  44  * This file tests both the aligned and (if available) unaligned load and store
  45  * operatations for SimdReal, SimdInt32, and Simd4Real.
  46  *
  47  * Note that you probably do not have to add more tests in this (complicated)
  48  * file; once the bootstrapping tests have passed we can use the working basic
  49  * load/store operations to test higher-level load/store operations too.
  50  *
  51  * \author Erik Lindahl <erik.lindahl@scilifelab.se>
  52  * \ingroup module_simd
  53  */
  54
  55 #include "config.h"
  56
  57 #include <gtest/gtest.h>
  58
  59 #include "gromacs/simd/simd.h"
  60 #include "gromacs/utility/basedefinitions.h"
  61 #include "gromacs/utility/real.h"
  62
  63 #if GMX_SIMD
  64
  65 namespace gmx
  66 {
  67
  68 namespace test
  69 {
  70
  71 namespace
  72 {
  73
  74 /*! \cond internal */
  75 /*! \addtogroup module_simd */
  76 /*! \{ */
  77
  78
  79 /*! \brief Generic routine to test load & store of SIMD, and check for side effects.
  80  *
  81  * The tests for load, store, unaligned load and unaligned store both for
  82  * real and int are pretty much similar, so we use a template function with
  83  * additional function pointers for the actual load/store calls.
  84  */
  85 template <typename T, typename TSimd, int simdWidth> void
  86 loadStoreTester(TSimd gmx_simdcall loadFn(const T* mem), void gmx_simdcall storeFn(T* mem, TSimd),
  87                 const int loadOffset, const int storeOffset)
  88 {
  89     /* We need simdWidth storage in the first place, another simdWidth elements
  90      * so we can create (deliberately) offset un-aligned pointers, and finally
  91      * simdWidth elements at the beginning and end
  92      * to test we are not polluting memory there either. Sum=4*simdWidth.
  93      */
  94     alignas(GMX_SIMD_ALIGNMENT) T        src[simdWidth*4];
  95     alignas(GMX_SIMD_ALIGNMENT) T        dst[simdWidth*4];
  96
  97     // Make sure we have memory to check both before and after the test pointers
  98     T *              pCopySrc = src + simdWidth + loadOffset;
  99     T *              pCopyDst = dst + simdWidth + storeOffset;
 100     int              i;
 101
 102     for (i = 0; i < simdWidth*4; i++)
 103     {
 104         src[i] =  1+i;
 105         dst[i] = -1-i;
 106     }
 107
 108     storeFn(pCopyDst, loadFn(pCopySrc));
 109
 110     for (i = 0; i < simdWidth; i++)
 111     {
 112         EXPECT_EQ(pCopySrc[i], pCopyDst[i]) << "SIMD load or store not moving data correctly for element " << i;
 113     }
 114
 115     for (i = 0; i < simdWidth*4; i++)
 116     {
 117         EXPECT_EQ(src[i], (T)(1+i)) << "Side effect on source memory, i = " << i;
 118         if (dst+i < pCopyDst || dst+i >= pCopyDst+simdWidth)
 119         {
 120             EXPECT_EQ(dst[i], (T)(-1-i)) << "Side effect on destination memory, i = " << i;
 121         }
 122     }
 123 }
 124
 125 /*! \brief Wrapper to handle proxy objects returned by some load functions.
 126  *
 127  * \tparam T      Type of scalar object
 128  * \tparam TSimd  Corresponding SIMD type
 129  * \param  m      Memory address to load from
 130  */
 131 template <typename T, typename TSimd> TSimd gmx_simdcall
 132 loadWrapper(const T * m) { return load<TSimd>(m); }
 133
 134 /*! \brief Wrapper to handle proxy objects returned by some loadU functions.
 135  *
 136  * \tparam T      Type of scalar object
 137  * \tparam TSimd  Corresponding SIMD type
 138  * \param  m      Memory address to load from
 139  */
 140 template <typename T, typename TSimd> TSimd gmx_simdcall
 141 loadUWrapper(const T * m) { return loadU<TSimd>(m); }
 142
 143
 144 #if GMX_SIMD_HAVE_REAL
 145 TEST(SimdBootstrapTest, loadStore)
 146 {
 147     loadStoreTester<real, SimdReal, GMX_SIMD_REAL_WIDTH>(loadWrapper, store, 0, 0);
 148 }
 149
 150 #    if GMX_SIMD_HAVE_LOADU
 151 TEST(SimdBootstrapTest, loadU)
 152 {
 153     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 154     {
 155         loadStoreTester<real, SimdReal, GMX_SIMD_REAL_WIDTH>(loadUWrapper, store, i, 0);
 156     }
 157 }
 158 #    endif  // GMX_SIMD_HAVE_LOADU
 159
 160 #    if GMX_SIMD_HAVE_STOREU
 161 TEST(SimdBootstrapTest, storeU)
 162 {
 163     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 164     {
 165         loadStoreTester<real, SimdReal, GMX_SIMD_REAL_WIDTH>(loadWrapper, storeU, 0, i);
 166     }
 167 }
 168 #    endif  // GMX_SIMD_HAVE_STOREU
 169
 170 // Tests for SimdInt32 load & store operations
 171 TEST(SimdBootstrapTest, loadStoreI)
 172 {
 173     loadStoreTester<int, SimdInt32, GMX_SIMD_REAL_WIDTH>(loadWrapper, store, 0, 0);
 174 }
 175
 176 #    if GMX_SIMD_HAVE_LOADU
 177 TEST(SimdBootstrapTest, loadUI)
 178 {
 179     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 180     {
 181         loadStoreTester<int, SimdInt32, GMX_SIMD_REAL_WIDTH>(loadUWrapper, store, i, 0);
 182     }
 183 }
 184 #    endif  // GMX_SIMD_HAVE_LOADU
 185
 186 #    if GMX_SIMD_HAVE_STOREU
 187 TEST(SimdBootstrapTest, storeUI)
 188 {
 189     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 190     {
 191         loadStoreTester<int, SimdInt32, GMX_SIMD_REAL_WIDTH>(loadWrapper, storeU, 0, i);
 192     }
 193 }
 194 #    endif // GMX_SIMD_HAVE_STOREU
 195 #endif     // GMX_SIMD_HAVE_REAL
 196
 197 #if GMX_SIMD4_HAVE_REAL
 198 TEST(SimdBootstrapTest, simd4LoadStore)
 199 {
 200     loadStoreTester<real, Simd4Real, GMX_SIMD4_WIDTH>(load4, store4, 0, 0);
 201 }
 202
 203 #    if GMX_SIMD_HAVE_LOADU
 204 TEST(SimdBootstrapTest, simd4LoadU)
 205 {
 206     for (int i = 0; i < GMX_SIMD4_WIDTH; i++)
 207     {
 208         loadStoreTester<real, Simd4Real, GMX_SIMD4_WIDTH>(load4U, store4, i, 0);
 209     }
 210 }
 211 #    endif  // GMX_SIMD_HAVE_LOADU
 212
 213 #    if GMX_SIMD_HAVE_STOREU
 214 TEST(SimdBootstrapTest, simd4StoreU)
 215 {
 216     for (int i = 0; i < GMX_SIMD4_WIDTH; i++)
 217     {
 218         loadStoreTester<real, Simd4Real, GMX_SIMD4_WIDTH>(load4, store4U, 0, i);
 219     }
 220 }
 221 #    endif // GMX_SIMD_HAVE_STOREU
 222 #endif     // GMX_SIMD4_HAVE_REAL
 223
 224 /*! \} */
 225 /*! \endcond */
 226
 227 }      // namespace
 228
 229 }      // namespace test
 230
 231 }      // namespace gmx
 232
 233 #endif // GMX_SIMD