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authorJiyoung Yun <jy910.yun@samsung.com>2016-12-27 07:46:08 (GMT)
committerJiyoung Yun <jy910.yun@samsung.com>2016-12-27 07:46:08 (GMT)
commitdb20f3f1bb8595633a7e16c8900fd401a453a6b5 (patch)
treee5435159cd1bf0519276363a6fe1663d1721bed3 /src/pal/tests/palsuite/c_runtime/fabs/test1/test1.cpp
parent4b4aad7217d3292650e77eec2cf4c198ea9c3b4b (diff)
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Imported Upstream version 1.0.0.9127upstream/1.0.0.9127
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+// 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;
+}