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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 _isnan with a number of trivial values, to ensure they indicated that
+** they are numbers. Then try with Positive/Negative Infinite, which should
+** also be numbers. Finally set the least and most significant bits of
+** the fraction to positive and negative, at which point it should return
+** the true value.
+**
+**==========================================================================*/
+
+#include <palsuite.h>
+
+#define TO_DOUBLE(x) (*((double*)((void*)&x)))
+#define TO_I64(x) (*((INT64*)((void*)&x)))
+
+/*
+ * NaN: any double with maximum exponent (0x7ff) and non-zero fraction
+ */
+int __cdecl main(int argc, char *argv[])
+{
+ /*
+ * Initialize the PAL and return FAIL if this fails
+ */
+ if (PAL_Initialize(argc, argv) != 0)
+ {
+ return FAIL;
+ }
+
+ /*
+ * Try some trivial values
+ */
+ if (_isnan(0.0))
+ {
+ Fail("_isnan() incorrectly identified %f as NaN!\n", 0.0);
+ }
+
+ if (_isnan(1.23456))
+ {
+ Fail("_isnan() incorrectly identified %f as NaN!\n", 1.234567);
+ }
+
+ if (_isnan(42.0))
+ {
+ Fail("_isnan() incorrectly identified %f as NaN!\n", 42.0);
+ }
+
+ UINT64 lneginf = UI64(0xfff0000000000000);
+ UINT64 lposinf = UI64(0x7ff0000000000000);
+
+ double neginf = TO_DOUBLE(lneginf);
+ double posinf = TO_DOUBLE(lposinf);
+
+ /*
+ * Try positive and negative infinity
+ */
+ if (_isnan(neginf))
+ {
+ Fail("_isnan() incorrectly identified negative infinity as NaN!\n");
+ }
+
+ if (_isnan(posinf))
+ {
+ Fail("_isnan() incorrectly identified infinity as NaN!\n");
+ }
+
+ /*
+ * Try setting the least significant bit of the fraction,
+ * positive and negative
+ */
+ UINT64 lsnan = UI64(0xfff0000000000001);
+ double snan = TO_DOUBLE(lsnan);
+
+ if (!_isnan(snan))
+ {
+ Fail("_isnan() failed to identify %I64x as NaN!\n", lsnan);
+ }
+
+ UINT64 lqnan = UI64(0x7ff0000000000001);
+ double qnan = TO_DOUBLE(lqnan);
+
+ if (!_isnan(qnan))
+ {
+ Fail("_isnan() failed to identify %I64x as NaN!\n", lqnan);
+ }
+
+ /*
+ * Try setting the most significant bit of the fraction,
+ * positive and negative
+ */
+ lsnan = UI64(0xfff8000000000000);
+ snan = TO_DOUBLE(lsnan);
+
+ if (!_isnan(snan))
+ {
+ Fail ("_isnan() failed to identify %I64x as NaN!\n", lsnan);
+ }
+
+ lqnan = UI64(0x7ff8000000000000);
+ qnan = TO_DOUBLE(lqnan);
+
+ if (!_isnan(qnan))
+ {
+ Fail ("_isnan() failed to identify %I64x as NaN!\n", lqnan);
+ }
+
+ PAL_Terminate();
+ return PASS;
+}