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Diffstat (limited to 'src/pal/tests/palsuite/c_runtime/fmodf/test1/test1.cpp')
| -rw-r--r-- | src/pal/tests/palsuite/c_runtime/fmodf/test1/test1.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/pal/tests/palsuite/c_runtime/fmodf/test1/test1.cpp b/src/pal/tests/palsuite/c_runtime/fmodf/test1/test1.cpp new file mode 100644 index 0000000000..31b45d3606 --- /dev/null +++ b/src/pal/tests/palsuite/c_runtime/fmodf/test1/test1.cpp @@ -0,0 +1,156 @@ +// 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 +** +** Purpose: Test to ensure that fmodf return the correct values +** +** Dependencies: PAL_Initialize +** PAL_Terminate +** Fail +** fabsf +** +**===========================================================================*/ + +#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 numerator; /* second component of the value to test the function with */ + float denominator; /* first component of the value to test the function with */ + float expected; /* expected result */ + float variance; /* maximum delta between the expected and actual result */ +}; + +/** + * validate + * + * test validation function + */ +void __cdecl validate(float numerator, float denominator, float expected, float variance) +{ + float result = fmodf(numerator, denominator); + + /* + * The test is valid when the difference between result + * and expected is less than or equal to variance + */ + float delta = fabsf(result - expected); + + if (delta > variance) + { + Fail("fmodf(%g, %g) returned %10.9g when it should have returned %10.9g", + numerator, denominator, result, expected); + } +} + +/** + * validate + * + * test validation function for values returning NaN + */ +void __cdecl validate_isnan(float numerator, float denominator) +{ + float result = fmodf(numerator, denominator); + + if (!_isnan(result)) + { + Fail("fmodf(%g, %g) returned %10.9g when it should have returned %10.9g", + numerator, denominator, result, PAL_NAN); + } +} + +/** + * main + * + * executable entry point + */ +INT __cdecl main(INT argc, CHAR **argv) +{ + struct test tests[] = + { + /* numerator denominator expected variance */ + { 0, PAL_POSINF, 0, PAL_EPSILON }, + { 0.312961796f, 0.949765715f, 0.312961796f, PAL_EPSILON }, + { 0.420770483f, 0.907167129f, 0.420770483f, PAL_EPSILON }, + { 0.594480769f, 0.804109828f, 0.594480769f, PAL_EPSILON }, + { 0.638961276f, 0.769238901f, 0.638961276f, PAL_EPSILON }, + { 0.649636939f, 0.760244597f, 0.649636939f, PAL_EPSILON }, + { 0.707106781f, 0.707106781f, 0, PAL_EPSILON }, + { 1, 1, 0, PAL_EPSILON }, + { 0.841470985f, 0.540302306f, 0.301168679f, PAL_EPSILON }, + { 0.903719457f, 0.428125148f, 0.0474691617f, PAL_EPSILON / 10 }, + { 0.987765946f, 0.155943695f, 0.0521037774f, PAL_EPSILON / 10 }, + { 0.991806244f, 0.127751218f, 0.0975477216f, PAL_EPSILON / 10 }, + { 0.743980337f, -0.668201510f, 0.0757788268f, PAL_EPSILON / 10 }, + { 0.410781291f, -0.911733915f, 0.410781291f, PAL_EPSILON }, + { 0, -1, 0, PAL_EPSILON }, + { 1, PAL_POSINF, 1, PAL_EPSILON * 10 }, + }; + + + // PAL initialization + if (PAL_Initialize(argc, argv) != 0) + { + return FAIL; + } + + for (int i = 0; i < (sizeof(tests) / sizeof(struct test)); i++) + { + validate( tests[i].numerator, tests[i].denominator, tests[i].expected, tests[i].variance); + validate(-tests[i].numerator, tests[i].denominator, -tests[i].expected, tests[i].variance); + validate( tests[i].numerator, -tests[i].denominator, tests[i].expected, tests[i].variance); + validate(-tests[i].numerator, -tests[i].denominator, -tests[i].expected, tests[i].variance); + } + + validate_isnan( 0, 0); + validate_isnan(-0.0f, 0); + validate_isnan( 0, -0.0f); + validate_isnan(-0.0f, -0.0f); + + validate_isnan( 1, 0); + validate_isnan(-1, 0); + validate_isnan( 1, -0.0f); + validate_isnan(-1, -0.0f); + + validate_isnan(PAL_POSINF, PAL_POSINF); + validate_isnan(PAL_NEGINF, PAL_POSINF); + validate_isnan(PAL_POSINF, PAL_NEGINF); + validate_isnan(PAL_NEGINF, PAL_NEGINF); + + validate_isnan(PAL_POSINF, 0); + validate_isnan(PAL_NEGINF, 0); + validate_isnan(PAL_POSINF, -0.0f); + validate_isnan(PAL_NEGINF, -0.0f); + + validate_isnan(PAL_POSINF, 1); + validate_isnan(PAL_NEGINF, 1); + validate_isnan(PAL_POSINF, -1); + validate_isnan(PAL_NEGINF, -1); + + PAL_Terminate(); + return PASS; +} |