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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: Checks that _finite correctly classifies all types
** of floating point numbers (NaN, -Infinity, Infinity,
** finite nonzero, unnormalized, 0, and -0)
**
**==========================================================================*/
#include <palsuite.h>
/*
The IEEE double precision floating point standard looks like this:
S EEEEEEEEEEE FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
0 1 11 12 63
S is the sign bit. The E bits are the exponent, and the 52 F bits are
the fraction. These represent a value, V.
If E=2047 and F is nonzero, then V=NaN ("Not a number")
If E=2047 and F is zero and S is 1, then V=-Infinity
If E=2047 and F is zero and S is 0, then V=Infinity
If 0<E<2047 then V=(-1)^S * 2^(E-1023) * (1.F) where "1.F" is the binary
number created by prefixing F with a leading 1 and a binary point.
If E=0 and F is nonzero, then V=(-1)^S * 2^(-1022) * (0.F) These are
"unnormalized" values.
If E=0 and F is zero and S is 1, then V=-0
If E=0 and F is zero and S is 0, then V=0
*/
#define TO_DOUBLE(x) (*((double*)((void*)&x)))
int __cdecl main(int argc, char **argv)
{
/*non-finite numbers*/
UINT64 lsnan = UI64(0xffffffffffffffff);
UINT64 lqnan = UI64(0x7fffffffffffffff);
UINT64 lneginf = UI64(0xfff0000000000000);
UINT64 lposinf = UI64(0x7ff0000000000000);
double snan = TO_DOUBLE(lsnan);
double qnan = TO_DOUBLE(lqnan);
double neginf = TO_DOUBLE(lneginf);
double posinf = TO_DOUBLE(lposinf);
/*finite numbers*/
UINT64 lnegunnormalized = UI64(0x800fffffffffffff);
UINT64 lposunnormalized = UI64(0x000fffffffffffff);
UINT64 lnegzero = UI64(0x8000000000000000);
double negunnormalized = TO_DOUBLE(lnegunnormalized);
double posunnormalized = TO_DOUBLE(lposunnormalized);
double negzero = TO_DOUBLE(lnegzero);
/*
* Initialize the PAL and return FAIL if this fails
*/
if (PAL_Initialize(argc, argv) != 0)
{
return FAIL;
}
/*non-finite numbers*/
if (_finite(snan) || _finite(qnan))
{
Fail("_finite() found NAN to be finite.\n");
}
if (_finite(neginf))
{
Fail("_finite() found negative infinity to be finite.\n");
}
if (_finite(posinf))
{
Fail("_finite() found infinity to be finite.\n");
}
/*finite numbers*/
if (!_finite(negunnormalized))
{
Fail("_finite() found a negative unnormalized value to be infinite.\n");
}
if (!_finite(posunnormalized))
{
Fail("_finite() found an unnormalized value to be infinite.\n");
}
if (!_finite(negzero))
{
Fail("_finite() found negative zero to be infinite.\n");
}
if (!_finite(+0.0))
{
Fail("_finite() found zero to be infinite.\n");
}
if (!_finite(-123.456))
{
Fail("_finite() found %f to be infinite.\n", -123.456);
}
if (!_finite(+123.456))
{
Fail("_finite() found %f to be infinite.\n", +123.456);
}
PAL_Terminate();
return PASS;
}
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