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_c0c1c2 = setSimdRealFrom3R( c0, c1, c2);
  68 const SimdReal rSimd_c3c4c5 = setSimdRealFrom3R( c3, c4, c5);
  69 const SimdReal rSimd_c6c7c8 = setSimdRealFrom3R( c6, c7, c8);
  70 const SimdReal rSimd_c3c0c4 = setSimdRealFrom3R( c3, c0, c4);
  71 const SimdReal rSimd_c4c6c8 = setSimdRealFrom3R( c4, c6, c8);
  72 const SimdReal rSimd_c7c2c3 = setSimdRealFrom3R( c7, c2, c3);
  73 const SimdReal rSimd_m0m1m2 = setSimdRealFrom3R(-c0, -c1, -c2);
  74 const SimdReal rSimd_m3m0m4 = setSimdRealFrom3R(-c3, -c0, -c4);
  75
  76 const SimdReal rSimd_2p25     = setSimdRealFrom1R( 2.25);
  77 const SimdReal rSimd_3p25     = setSimdRealFrom1R( 3.25);
  78 const SimdReal rSimd_3p75     = setSimdRealFrom1R( 3.75);
  79 const SimdReal rSimd_m2p25    = setSimdRealFrom1R(-2.25);
  80 const SimdReal rSimd_m3p25    = setSimdRealFrom1R(-3.25);
  81 const SimdReal rSimd_m3p75    = setSimdRealFrom1R(-3.75);
  82 const SimdReal rSimd_Exp      = setSimdRealFrom3R( 1.4055235171027452623914516e+18,
  83                                                    5.3057102734253445623914516e-13,
  84                                                    -2.1057102745623934534514516e+16);
  85 #if GMX_SIMD_HAVE_DOUBLE && GMX_DOUBLE
  86 // Make sure we also test exponents outside single precision when we use double
  87 const SimdReal rSimd_ExpDouble = setSimdRealFrom3R( 6.287393598732017379054414e+176,
  88                                                     8.794495252903116023030553e-140,
  89                                                     -3.637060701570496477655022e+202);
  90 #endif  // GMX_SIMD_HAVE_DOUBLE && GMX_DOUBLE
  91
  92 #if GMX_SIMD_HAVE_LOGICAL
  93 // The numbers below all have exponent (2^0), which will not change with AND/OR operations.
  94 // We also leave the last part of the mantissa as zeros, to avoid rounding issues in the compiler
  95 #if GMX_DOUBLE
  96 const SimdReal rSimd_logicalA         = setSimdRealFrom1R(1.3333333332557231188); // mantissa 01010101010101010101010101010101
  97 const SimdReal rSimd_logicalB         = setSimdRealFrom1R(1.7999999998137354851); // mantissa 11001100110011001100110011001100
  98 const SimdReal rSimd_logicalResultAnd = setSimdRealFrom1R(1.266666666604578495);  // mantissa 01000100010001000100010001000100
  99 const SimdReal rSimd_logicalResultOr  = setSimdRealFrom1R(1.8666666664648801088); // mantissa 11011101110111011101110111011101
 100 #else                                                                             // GMX_DOUBLE
 101 const SimdReal rSimd_logicalA         = setSimdRealFrom1R(1.3333282470703125);    // mantissa 0101010101010101
 102 const SimdReal rSimd_logicalB         = setSimdRealFrom1R(1.79998779296875);      // mantissa 1100110011001100
 103 const SimdReal rSimd_logicalResultAnd = setSimdRealFrom1R(1.26666259765625);      // mantissa 0100010001000100
 104 const SimdReal rSimd_logicalResultOr  = setSimdRealFrom1R(1.8666534423828125);    // mantissa 1101110111011101
 105 #endif                                                                            // GMX_DOUBLE
 106 #endif                                                                            // GMX_SIMD_HAVE_LOGICAL
 107
 108 #endif                                                                            // GMX_SIMD_HAVE_REAL
 109 #if GMX_SIMD_HAVE_INT32_ARITHMETICS
 110 const SimdInt32 iSimd_1_2_3      = setSimdIntFrom3I(1, 2, 3);
 111 const SimdInt32 iSimd_4_5_6      = setSimdIntFrom3I(4, 5, 6);
 112 const SimdInt32 iSimd_7_8_9      = setSimdIntFrom3I(7, 8, 9);
 113 const SimdInt32 iSimd_5_7_9      = setSimdIntFrom3I(5, 7, 9);
 114 const SimdInt32 iSimd_1M_2M_3M   = setSimdIntFrom3I(1000000, 2000000, 3000000);
 115 const SimdInt32 iSimd_4M_5M_6M   = setSimdIntFrom3I(4000000, 5000000, 6000000);
 116 const SimdInt32 iSimd_5M_7M_9M   = setSimdIntFrom3I(5000000, 7000000, 9000000);
 117 #endif
 118 #if GMX_SIMD_HAVE_INT32_LOGICAL
 119 const SimdInt32 iSimd_0xF0F0F0F0 = setSimdIntFrom1I(0xF0F0F0F0);
 120 const SimdInt32 iSimd_0xCCCCCCCC = setSimdIntFrom1I(0xCCCCCCCC);
 121 #endif
 122
 123 #if GMX_SIMD_HAVE_REAL
 124 ::std::vector<real>
 125 simdReal2Vector(const SimdReal simd)
 126 {
 127     GMX_ALIGNED(real, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 128
 129     store(mem, simd);
 130     std::vector<real>   v(mem, mem+GMX_SIMD_REAL_WIDTH);
 131
 132     return v;
 133 }
 134
 135 SimdReal
 136 vector2SimdReal(const std::vector<real> &v)
 137 {
 138     GMX_ALIGNED(real, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 139
 140     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 141     {
 142         mem[i] = v[i % v.size()];  // repeat vector contents to fill simd width
 143     }
 144     return load(mem);
 145 }
 146
 147 SimdReal
 148 setSimdRealFrom3R(real r0, real r1, real r2)
 149 {
 150     std::vector<real> v(3);
 151     v[0] = r0;
 152     v[1] = r1;
 153     v[2] = r2;
 154     return vector2SimdReal(v);
 155 }
 156
 157 SimdReal
 158 setSimdRealFrom1R(real value)
 159 {
 160     std::vector<real> v(GMX_SIMD_REAL_WIDTH);
 161     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 162     {
 163         v[i] = value;
 164     }
 165     return vector2SimdReal(v);
 166 }
 167
 168 testing::AssertionResult
 169 SimdTest::compareSimdRealUlp(const char *  refExpr,     const char *  tstExpr,
 170                              const SimdReal ref, const SimdReal tst)
 171 {
 172     return compareVectorRealUlp(refExpr, tstExpr, simdReal2Vector(ref), simdReal2Vector(tst));
 173 }
 174
 175 testing::AssertionResult
 176 SimdTest::compareSimdRealEq(const char * refExpr, const char * tstExpr,
 177                             const SimdReal ref, const SimdReal tst)
 178 {
 179     return compareVectorEq(refExpr, tstExpr, simdReal2Vector(ref), simdReal2Vector(tst));
 180 }
 181
 182 std::vector<int>
 183 simdInt2Vector(const SimdInt32 simd)
 184 {
 185     GMX_ALIGNED(int, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 186
 187     store(mem, simd);
 188     std::vector<int>    v(mem, mem+GMX_SIMD_REAL_WIDTH);
 189
 190     return v;
 191 }
 192
 193 SimdInt32
 194 vector2SimdInt(const std::vector<int> &v)
 195 {
 196     GMX_ALIGNED(int, GMX_SIMD_REAL_WIDTH)  mem[GMX_SIMD_REAL_WIDTH];
 197
 198     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 199     {
 200         mem[i] = v[i % v.size()];  // repeat vector contents to fill simd width
 201     }
 202     return load(mem);
 203 }
 204
 205 SimdInt32
 206 setSimdIntFrom3I(int i0, int i1, int i2)
 207 {
 208     std::vector<int> v(3);
 209     v[0] = i0;
 210     v[1] = i1;
 211     v[2] = i2;
 212     return vector2SimdInt(v);
 213 }
 214
 215 SimdInt32
 216 setSimdIntFrom1I(int value)
 217 {
 218     std::vector<int> v(GMX_SIMD_REAL_WIDTH);
 219     for (int i = 0; i < GMX_SIMD_REAL_WIDTH; i++)
 220     {
 221         v[i] = value;
 222     }
 223     return vector2SimdInt(v);
 224 }
 225
 226 ::testing::AssertionResult
 227 SimdTest::compareSimdInt32(const char *  refExpr,      const char *  tstExpr,
 228                            const SimdInt32 ref, const SimdInt32 tst)
 229 {
 230     return compareVectorEq(refExpr, tstExpr, simdInt2Vector(ref), simdInt2Vector(tst));
 231 }
 232
 233 #endif  // GMX_SIMD_HAVE_REAL
 234
 235 /*! \} */
 236 /*! \endcond */
 237
 238 }      // namespace
 239 }      // namespace
 240
 241 #endif // GMX_SIMD