src/gromacs/simd/tests/simd.cpp

   1 /*
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  35 #include "gmxpre.h"
  36
  37 #include "simd.h"
  38
  39 #include "gromacs/simd/simd.h"
  40 #include "gromacs/utility/basedefinitions.h"
  41
  42 #if GMX_SIMD
  43
  44 namespace gmx
  45 {
  46 namespace test
  47 {
  48
  49 /*! \cond internal */
  50 /*! \addtogroup module_simd */
  51 /*! \{ */
  52
  53 /* Unfortunately we cannot keep static SIMD constants in the test fixture class.
  54  * The problem is that SIMD memory need to be aligned, and in particular
  55  * this applies to automatic storage of variables in classes. For SSE registers
  56  * this means 16-byte alignment (which seems to work), but AVX requires 32-bit
  57  * alignment. At least both gcc-4.7.3 and Apple clang-5.0 (OS X 10.9) fail to
  58  * align these variables when they are stored as data in a class.
  59  *
  60  * In theory we could set some of these on-the-fly e.g. with setSimdRealFrom3R()
  61  * instead (although that would mean repeating code between tests), but many of
  62  * the constants depend on the current precision not to mention they
  63  * occasionally have many digits that need to be exactly right, and keeping
  64  * them in a single place makes sure they are consistent.
  65  */
  66 #if GMX_SIMD_HAVE_REAL
  67 const SimdReal rSimd_1_2_3    = setSimdRealFrom3R(1, 2, 3);
  68 const SimdReal rSimd_4_5_6    = setSimdRealFrom3R(4, 5, 6);
  69 const SimdReal rSimd_7_8_9    = setSimdRealFrom3R(7, 8, 9);
  70 const SimdReal rSimd_5_7_9    = setSimdRealFrom3R(5, 7, 9);
  71 const SimdReal rSimd_m1_m2_m3 = setSimdRealFrom3R(-1, -2, -3);
  72 const SimdReal rSimd_3_1_4    = setSimdRealFrom3R(3, 1, 4);
  73 const SimdReal rSimd_m3_m1_m4 = setSimdRealFrom3R(-3, -1, -4);
  74 const SimdReal rSimd_2p25     = setSimdRealFrom1R(2.25);
  75 const SimdReal rSimd_3p25     = setSimdRealFrom1R(3.25);
  76 const SimdReal rSimd_3p75     = setSimdRealFrom1R(3.75);
  77 const SimdReal rSimd_m2p25    = setSimdRealFrom1R(-2.25);
  78 const SimdReal rSimd_m3p25    = setSimdRealFrom1R(-3.25);
  79 const SimdReal rSimd_m3p75    = setSimdRealFrom1R(-3.75);
  80 const SimdReal rSimd_Exp      = setSimdRealFrom3R( 1.4055235171027452623914516e+18,
  81                                                    5.3057102734253445623914516e-13,
  82                                                    -2.1057102745623934534514516e+16);
  83 #    if GMX_SIMD_HAVE_DOUBLE && GMX_DOUBLE
  84 // Make sure we also test exponents outside single precision when we use double
  85 const SimdReal rSimd_ExpDouble = setSimdRealFrom3R( 6.287393598732017379054414e+176,
  86                                                     8.794495252903116023030553e-140,
  87                                                     -3.637060701570496477655022e+202);
  88 #    endif
  89 #endif  // GMX_SIMD_HAVE_REAL
  90 #if GMX_SIMD_HAVE_INT32_ARITHMETICS
  91 const SimdInt32 iSimd_1_2_3      = setSimdIntFrom3I(1, 2, 3);
  92 const SimdInt32 iSimd_4_5_6      = setSimdIntFrom3I(4, 5, 6);
  93 const SimdInt32 iSimd_7_8_9      = setSimdIntFrom3I(7, 8, 9);
  94 const SimdInt32 iSimd_5_7_9      = setSimdIntFrom3I(5, 7, 9);
  95 const SimdInt32 iSimd_1M_2M_3M   = setSimdIntFrom3I(1000000, 2000000, 3000000);
  96 const SimdInt32 iSimd_4M_5M_6M   = setSimdIntFrom3I(4000000, 5000000, 6000000);
  97 const SimdInt32 iSimd_5M_7M_9M   = setSimdIntFrom3I(5000000, 7000000, 9000000);
  98 #endif
  99 #if GMX_SIMD_HAVE_INT32_LOGICAL
 100 const SimdInt32 iSimd_0xF0F0F0F0 = setSimdIntFrom1I(0xF0F0F0F0);
 101 const SimdInt32 iSimd_0xCCCCCCCC = setSimdIntFrom1I(0xCCCCCCCC);
 102 #endif
 103
 104 #if GMX_SIMD_HAVE_REAL
 105 ::std::vector<real>
 106 simdReal2Vector(const SimdReal simd)
 107 {
 108     GMX_ALIGNED(real, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 109
 110     store(mem, simd);
 111     std::vector<real>   v(mem, mem+GMX_SIMD_REAL_WIDTH);
 112
 113     return v;
 114 }
 115
 116 SimdReal
 117 vector2SimdReal(const std::vector<real> &v)
 118 {
 119     GMX_ALIGNED(real, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 120
 121     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 122     {
 123         mem[i] = v[i % v.size()];  // repeat vector contents to fill simd width
 124     }
 125     return load(mem);
 126 }
 127
 128 SimdReal
 129 setSimdRealFrom3R(real r0, real r1, real r2)
 130 {
 131     std::vector<real> v(3);
 132     v[0] = r0;
 133     v[1] = r1;
 134     v[2] = r2;
 135     return vector2SimdReal(v);
 136 }
 137
 138 SimdReal
 139 setSimdRealFrom1R(real value)
 140 {
 141     std::vector<real> v(GMX_SIMD_REAL_WIDTH);
 142     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 143     {
 144         v[i] = value;
 145     }
 146     return vector2SimdReal(v);
 147 }
 148
 149 testing::AssertionResult
 150 SimdTest::compareSimdRealUlp(const char *  refExpr,     const char *  tstExpr,
 151                              const SimdReal ref, const SimdReal tst)
 152 {
 153     return compareVectorRealUlp(refExpr, tstExpr, simdReal2Vector(ref), simdReal2Vector(tst));
 154 }
 155
 156 testing::AssertionResult
 157 SimdTest::compareSimdRealEq(const char * refExpr, const char * tstExpr,
 158                             const SimdReal ref, const SimdReal tst)
 159 {
 160     return compareVectorEq(refExpr, tstExpr, simdReal2Vector(ref), simdReal2Vector(tst));
 161 }
 162
 163 std::vector<int>
 164 simdInt2Vector(const SimdInt32 simd)
 165 {
 166     GMX_ALIGNED(int, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 167
 168     store(mem, simd);
 169     std::vector<int>    v(mem, mem+GMX_SIMD_REAL_WIDTH);
 170
 171     return v;
 172 }
 173
 174 SimdInt32
 175 vector2SimdInt(const std::vector<int> &v)
 176 {
 177     GMX_ALIGNED(int, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 178
 179     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 180     {
 181         mem[i] = v[i % v.size()];  // repeat vector contents to fill simd width
 182     }
 183     return load(mem);
 184 }
 185
 186 SimdInt32
 187 setSimdIntFrom3I(int i0, int i1, int i2)
 188 {
 189     std::vector<int> v(3);
 190     v[0] = i0;
 191     v[1] = i1;
 192     v[2] = i2;
 193     return vector2SimdInt(v);
 194 }
 195
 196 SimdInt32
 197 setSimdIntFrom1I(int value)
 198 {
 199     std::vector<int> v(GMX_SIMD_REAL_WIDTH);
 200     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 201     {
 202         v[i] = value;
 203     }
 204     return vector2SimdInt(v);
 205 }
 206
 207 ::testing::AssertionResult
 208 SimdTest::compareSimdInt32(const char *  refExpr,      const char *  tstExpr,
 209                            const SimdInt32 ref, const SimdInt32 tst)
 210 {
 211     return compareVectorEq(refExpr, tstExpr, simdInt2Vector(ref), simdInt2Vector(tst));
 212 }
 213
 214 #endif  // GMX_SIMD_HAVE_REAL
 215
 216 /*! \} */
 217 /*! \endcond */
 218
 219 }      // namespace
 220 }      // namespace
 221
 222 #endif // GMX_SIMD