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Diffstat (limited to 'src/pal/tests/palsuite/c_runtime/modf/test1/test1.cpp')
-rw-r--r-- | src/pal/tests/palsuite/c_runtime/modf/test1/test1.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/pal/tests/palsuite/c_runtime/modf/test1/test1.cpp b/src/pal/tests/palsuite/c_runtime/modf/test1/test1.cpp new file mode 100644 index 0000000000..389d079253 --- /dev/null +++ b/src/pal/tests/palsuite/c_runtime/modf/test1/test1.cpp @@ -0,0 +1,136 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +/*============================================================================= +** +** Source: test1.c (modf) +** +** Purpose: Test to ensure that modf return the correct values +** +** Dependencies: PAL_Initialize +** PAL_Terminate +** Fail +** fabs +** +**===========================================================================*/ + +#include <palsuite.h> + +// binary64 (double) has a machine epsilon of 2^-52 (approx. 2.22e-16). However, this +// is slightly too accurate when writing tests meant to run against libm implementations +// for various platforms. 2^-50 (approx. 8.88e-16) seems to be as accurate as we can get. +// +// The tests themselves will take PAL_EPSILON and adjust it according to the expected result +// so that the delta used for comparison will compare the most significant digits and ignore +// any digits that are outside the double precision range (15-17 digits). + +// For example, a test with an expect result in the format of 0.xxxxxxxxxxxxxxxxx will use +// PAL_EPSILON for the variance, while an expected result in the format of 0.0xxxxxxxxxxxxxxxxx +// will use PAL_EPSILON / 10 and and expected result in the format of x.xxxxxxxxxxxxxxxx will +// use PAL_EPSILON * 10. +#define PAL_EPSILON 8.8817841970012523e-16 + +#define PAL_NAN sqrt(-1.0) +#define PAL_POSINF -log(0.0) +#define PAL_NEGINF log(0.0) + +/** + * Helper test structure + */ +struct test +{ + double value; /* value to test the function with */ + double expected; /* expected result */ + double variance; /* maximum delta between the expected and actual result */ + double expected_intpart; /* expected result */ + double variance_intpart; /* maximum delta between the expected and actual result */ +}; + +/** + * validate + * + * test validation function + */ +void __cdecl validate(double value, double expected, double variance, double expected_intpart, double variance_intpart) +{ + double result_intpart; + double result = modf(value, &result_intpart); + + /* + * The test is valid when the difference between result + * and expected is less than or equal to variance + */ + double delta = fabs(result - expected); + double delta_intpart = fabs(result_intpart - expected_intpart); + + if ((delta > variance) || (delta_intpart > variance_intpart)) + { + Fail("modf(%g) returned %20.17g with an intpart of %20.17g when it should have returned %20.17g with an intpart of %20.17g", + value, result, result_intpart, expected, expected_intpart); + } +} + +/** + * validate + * + * test validation function for values returning NaN + */ +void __cdecl validate_isnan(double value) +{ + double result_intpart; + double result = modf(value, &result_intpart); + + if (!_isnan(result) || !_isnan(result_intpart)) + { + Fail("modf(%g) returned %20.17g with an intpart of %20.17g when it should have returned %20.17g with an intpart of %20.17g", + value, result, result_intpart, PAL_NAN, PAL_NAN); + } +} + +/** + * main + * + * executable entry point + */ +int __cdecl main(int argc, char **argv) +{ + struct test tests[] = + { + /* value expected variance expected_intpart variance_intpart */ + { 0, 0, PAL_EPSILON, 0, PAL_EPSILON }, + { 0.31830988618379067, 0.31830988618379067, PAL_EPSILON, 0, PAL_EPSILON }, // value: 1 / pi + { 0.43429448190325183, 0.43429448190325183, PAL_EPSILON, 0, PAL_EPSILON }, // value: log10(e) + { 0.63661977236758134, 0.63661977236758134, PAL_EPSILON, 0, PAL_EPSILON }, // value: 2 / pi + { 0.69314718055994531, 0.69314718055994531, PAL_EPSILON, 0, PAL_EPSILON }, // value: ln(2) + { 0.70710678118654752, 0.70710678118654752, PAL_EPSILON, 0, PAL_EPSILON }, // value: 1 / sqrt(2) + { 0.78539816339744831, 0.78539816339744831, PAL_EPSILON, 0, PAL_EPSILON }, // value: pi / 4 + { 1, 0, PAL_EPSILON, 1, PAL_EPSILON * 10 }, + { 1.1283791670955126, 0.1283791670955126, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: 2 / sqrt(pi) + { 1.4142135623730950, 0.4142135623730950, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: sqrt(2) + { 1.4426950408889634, 0.4426950408889634, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: log2(e) + { 1.5707963267948966, 0.5707963267948966, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: pi / 2 + { 2.3025850929940457, 0.3025850929940457, PAL_EPSILON, 2, PAL_EPSILON * 10 }, // value: ln(10) + { 2.7182818284590452, 0.7182818284590452, PAL_EPSILON, 2, PAL_EPSILON * 10 }, // value: e + { 3.1415926535897932, 0.1415926535897932, PAL_EPSILON, 3, PAL_EPSILON * 10 }, // value: pi + { PAL_POSINF, 0, PAL_EPSILON, PAL_POSINF, 0 } + + }; + + /* PAL initialization */ + if (PAL_Initialize(argc, argv) != 0) + { + return FAIL; + } + + for (int i = 0; i < (sizeof(tests) / sizeof(struct test)); i++) + { + validate( tests[i].value, tests[i].expected, tests[i].variance, tests[i].expected_intpart, tests[i].variance_intpart); + validate(-tests[i].value, -tests[i].expected, tests[i].variance, -tests[i].expected_intpart, tests[i].variance_intpart); + } + + validate_isnan(PAL_NAN); + + PAL_Terminate(); + return PASS; +} |