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36 #ifndef GMX_SIMD_TESTS_BASE_H
37 #define GMX_SIMD_TESTS_BASE_H
41 * Declares common base class for testing SIMD and SIMD4.
43 * The base class contains the settings for absolute and ulp tolerances,
44 * as well as testing ranges used for both SIMD and SIMD4 tests, mainly
45 * to keep everything symmetric and clean. The class also defines a couple
46 * of generic tests that compare vectors of elements with arbitrary length for
47 * either exact or approximate matching (in terms of ulp). These are used in
48 * derived classes that convert either SIMD or SIMD4 values to
49 * std::vector<real> and then performs the comparison.
51 * \author Erik Lindahl <erik.lindahl@scilifelab.se>
52 * \ingroup module_simd
55 #include <gtest/gtest.h>
56 #include "gromacs/simd/simd.h"
66 * Base class for SIMD test fixtures.
68 * This class contains settings that are common for SIMD and SIMD4 tests,
69 * and it is thus not used directly for any tests, but derived separately
70 * in simd.h and simd4.h.
72 * \ingroup module_simd
74 class SimdBaseTest : public ::testing::Test
77 /*! \brief Initialize new SIMD test fixture with default tolerances.
79 * The default absolute tolerance is set to 0, which means the we always
80 * check the ulp tolerance by default (passing the absolute tolerance
81 * test would otherwise mean we approve the test instantly).
82 * The default ulp tolerance is set to 10 units in single, and 255 units
83 * in double precision.
84 * Most SIMD math functions achieve 2-3 ulp accuracy in single, but by
85 * being a bit liberal we avoid tests failing on aggressive compilers.
87 * For double precision we only aim to achieve twice the accuracy of
88 * single. This way we can make do with a single extra iteration
89 * in some algorithms, in particular 1/sqrt(x).
91 * The range is used by derived classes to test math functions. The
92 * default test range will be [1,10], which is intentionally
93 * conservative so it works with (inverse) square root, division,
94 * exponentials, logarithms, and error functions.
99 ulpTol_ = 255LL; // Aim for roughly twice the precision we have in single.
101 ulpTol_ = 10LL; // Be a bit liberal so compiler optimization doesn't bite us.
104 range_ = std::pair<real, real>(1, 10);
107 /*! \brief Adjust ulp tolerance from the default 10 (float) or 255 (double). */
108 void setUlpTol(gmx_int64_t newTol) { ulpTol_ = newTol; }
110 /*! \brief Adjust the absolute tolerance from the default 0.
112 * If values are closer than the absolute tolerance, the test will pass
113 * no matter what their ulp difference is.
115 void setAbsTol(real newTol) { absTol_ = newTol; }
117 /*! \brief Change math function testing range from the default [1,10]. */
118 void setRange(real low, real high) { range_.first = low; range_.second = high; }
120 static int s_nPoints; //!< Number of test points to use, settable on command line.
122 /*! \brief Compare two std::vector<real> for approximate equality.
124 * This is an internal implementation routine that will be used by
125 * routines in derived child classes that first convert SIMD or SIMD4
126 * variables to std::vector<real>. Do not call it directly.
128 * This routine is designed according to the Google test specs, so the char
129 * strings will describe the arguments to the macro.
131 * The comparison is applied to each element, and it returns true if each element
132 * in the vector test variable is within the class tolerances of the corresponding
133 * reference elements.
135 ::testing::AssertionResult
136 compareVectorRealUlp(const char * refExpr, const char * tstExpr,
137 const std::vector<real> &ref, const std::vector<real> &tst);
139 /*! \brief Compare std::vectors for exact equality.
141 * The template in this class makes it usable for testing both
142 * SIMD floating-point and integers variables, after conversion to
144 * This is an internal implementation routine that will be used by
145 * routines in derived child classes that first convert SIMD or SIMD4
146 * variables to std::vector<real>. Do not call it directly.
148 * This routine is designed according to the Google test specs, so the char
149 * strings will describe the arguments to the macro.
151 * The comparison is applied to each element, and it returns true if each element
152 * in the vector test variable is within the class tolerances of the corresponding
153 * reference elements.
155 template <typename T> ::testing::AssertionResult
156 compareVectorEq(const char * refExpr, const char * tstExpr,
157 const std::vector<T> &ref, const std::vector<T> &tst)
161 return ::testing::AssertionSuccess();
165 return ::testing::AssertionFailure()
166 << "Failing SIMD comparison between " << refExpr << " and " << tstExpr << std::endl
167 << "Ref. values: " << ::testing::PrintToString(ref) << std::endl
168 << "Test values: " << ::testing::PrintToString(tst) << std::endl;
173 gmx_int64_t ulpTol_; //!< Current tolerance in units-in-last-position.
174 real absTol_; //!< Current absolute tolerance.
175 std::pair<real, real> range_; //!< Range for math function tests.
181 #endif // GMX_SIMD_TESTS_BASE_H