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Diffstat (limited to 'src/pal/tests/palsuite/c_runtime/modff/test1/test1.cpp')
| -rw-r--r-- | src/pal/tests/palsuite/c_runtime/modff/test1/test1.cpp | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/pal/tests/palsuite/c_runtime/modff/test1/test1.cpp b/src/pal/tests/palsuite/c_runtime/modff/test1/test1.cpp new file mode 100644 index 0000000000..6b7a50be39 --- /dev/null +++ b/src/pal/tests/palsuite/c_runtime/modff/test1/test1.cpp @@ -0,0 +1,135 @@ +// 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> + +// binary32 (float) has a machine epsilon of 2^-23 (approx. 1.19e-07). However, this +// is slightly too accurate when writing tests meant to run against libm implementations +// for various platforms. 2^-21 (approx. 4.76e-07) 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 (6-9 digits). + +// For example, a test with an expect result in the format of 0.xxxxxxxxx will use PAL_EPSILON +// for the variance, while an expected result in the format of 0.0xxxxxxxxx will use +// PAL_EPSILON / 10 and and expected result in the format of x.xxxxxx will use PAL_EPSILON * 10. +#define PAL_EPSILON 4.76837158e-07 + +#define PAL_NAN sqrt(-1.0) +#define PAL_POSINF -log(0.0) +#define PAL_NEGINF log(0.0) + +/** + * Helper test structure + */ +struct test +{ + float value; /* value to test the function with */ + float expected; /* expected result */ + float variance; /* maximum delta between the expected and actual result */ + float expected_intpart; /* expected result */ + float variance_intpart; /* maximum delta between the expected and actual result */ +}; + +/** + * validate + * + * test validation function + */ +void __cdecl validate(float value, float expected, float variance, float expected_intpart, float variance_intpart) +{ + float result_intpart; + float result = modff(value, &result_intpart); + + /* + * The test is valid when the difference between result + * and expected is less than or equal to variance + */ + float delta = fabsf(result - expected); + float delta_intpart = fabsf(result_intpart - expected_intpart); + + if ((delta > variance) || (delta_intpart > variance_intpart)) + { + Fail("modff(%g) returned %10.9g with an intpart of %10.9g when it should have returned %10.9g with an intpart of %10.9g", + value, result, result_intpart, expected, expected_intpart); + } +} + +/** + * validate + * + * test validation function for values returning NaN + */ +void __cdecl validate_isnan(float value) +{ + float result_intpart; + float result = modff(value, &result_intpart); + + if (!_isnan(result) || !_isnan(result_intpart)) + { + Fail("modff(%g) returned %10.9g with an intpart of %10.9g when it should have returned %10.9g with an intpart of %10.9g", + 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 }, + { 0.318309886f, 0.318309886f, PAL_EPSILON, 0, PAL_EPSILON }, // value: 1 / pi + { 0.434294482f, 0.434294482f, PAL_EPSILON, 0, PAL_EPSILON }, // value: log10(e) + { 0.636619772f, 0.636619772f, PAL_EPSILON, 0, PAL_EPSILON }, // value: 2 / pi + { 0.693147181f, 0.693147181f, PAL_EPSILON, 0, PAL_EPSILON }, // value: ln(2) + { 0.707106781f, 0.707106781f, PAL_EPSILON, 0, PAL_EPSILON }, // value: 1 / sqrt(2) + { 0.785398163f, 0.785398163f, PAL_EPSILON, 0, PAL_EPSILON }, // value: pi / 4 + { 1, 0, PAL_EPSILON, 1, PAL_EPSILON * 10 }, + { 1.12837917f, 0.128379167f, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: 2 / sqrt(pi) + { 1.41421356f, 0.414213562f, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: sqrt(2) + { 1.44269504f, 0.442695041f, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: log2(e) + { 1.57079633f, 0.570796327f, PAL_EPSILON, 1, PAL_EPSILON * 10 }, // value: pi / 2 + { 2.30258509f, 0.302585093f, PAL_EPSILON, 2, PAL_EPSILON * 10 }, // value: ln(10) + { 2.71828183f, 0.718281828f, PAL_EPSILON, 2, PAL_EPSILON * 10 }, // value: e + { 3.14159265f, 0.141592654f, 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; +} |