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Diffstat (limited to 'src/pal/tests/palsuite/c_runtime/fabs/test1/test1.c')
-rw-r--r-- | src/pal/tests/palsuite/c_runtime/fabs/test1/test1.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/pal/tests/palsuite/c_runtime/fabs/test1/test1.c b/src/pal/tests/palsuite/c_runtime/fabs/test1/test1.c new file mode 100644 index 0000000000..0a74d5c1c5 --- /dev/null +++ b/src/pal/tests/palsuite/c_runtime/fabs/test1/test1.c @@ -0,0 +1,130 @@ +// 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 fabs return the correct values +** +** Dependencies: PAL_Initialize +** PAL_Terminate +** Fail +** +**===========================================================================*/ + +#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 */ +}; + +/** + * validate + * + * test validation function + */ +void __cdecl validate(double value, double expected, double variance) +{ + double result = fabs(value); + + /* + * The test is valid when the difference between result + * and expected is less than or equal to variance + */ + double delta = fabs(result - expected); + + if (delta > variance) + { + Fail("fabs(%g) returned %20.17g when it should have returned %20.17g", + value, result, expected); + } +} + +/** + * validate + * + * test validation function for values returning NaN + */ +void __cdecl validate_isnan(double value) +{ + double result = fabs(value); + + if (!_isnan(result)) + { + Fail("fabs(%g) returned %20.17g when it should have returned %20.17g", + value, result, PAL_NAN); + } +} + +/** + * main + * + * executable entry point + */ +INT __cdecl main(INT argc, CHAR **argv) +{ + struct test tests[] = + { + /* value expected variance */ + { PAL_NEGINF, PAL_POSINF, 0 }, + { -3.1415926535897932, 3.1415926535897932, PAL_EPSILON * 10 }, // value: -(pi) expected: pi + { -2.7182818284590452, 2.7182818284590452, PAL_EPSILON * 10 }, // value: -(e) expected: e + { -2.3025850929940457, 2.3025850929940457, PAL_EPSILON * 10 }, // value: -(ln(10)) expected: ln(10) + { -1.5707963267948966, 1.5707963267948966, PAL_EPSILON * 10 }, // value: -(pi / 2) expected: pi / 2 + { -1.4426950408889634, 1.4426950408889634, PAL_EPSILON * 10 }, // value: -(log2(e)) expected: log2(e) + { -1.4142135623730950, 1.4142135623730950, PAL_EPSILON * 10 }, // value: -(sqrt(2)) expected: sqrt(2) + { -1.1283791670955126, 1.1283791670955126, PAL_EPSILON * 10 }, // value: -(2 / sqrt(pi)) expected: 2 / sqrt(pi) + { -1, 1, PAL_EPSILON * 10 }, + { -0.78539816339744831, 0.78539816339744831, PAL_EPSILON }, // value: -(pi / 4) expected: pi / 4 + { -0.70710678118654752, 0.70710678118654752, PAL_EPSILON }, // value: -(1 / sqrt(2)) expected: 1 / sqrt(2) + { -0.69314718055994531, 0.69314718055994531, PAL_EPSILON }, // value: -(ln(2)) expected: ln(2) + { -0.63661977236758134, 0.63661977236758134, PAL_EPSILON }, // value: -(2 / pi) expected: 2 / pi + { -0.43429448190325183, 0.43429448190325183, PAL_EPSILON }, // value: -(log10(e)) expected: log10(e) + { -0.31830988618379067, 0.31830988618379067, PAL_EPSILON }, // value: -(1 / pi) expected: 1 / pi + { -0.0, 0, PAL_EPSILON }, + }; + + + // 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); + validate(-tests[i].value, tests[i].expected, tests[i].variance); + } + + validate_isnan(PAL_NAN); + + PAL_Terminate(); + return PASS; +} |