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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 _finitef correctly classifies all types
** of floating point numbers (NaN, -Infinity, Infinity,
** finite nonzero, unnormalized, 0, and -0)
**
**==========================================================================*/
#include <palsuite.h>
/*
The IEEE single precision floating point standard looks like this:
S EEEEEEEE FFFFFFFFFFFFFFFFFFFFFFF
0 1 8 9 31
S is the sign bit. The E bits are the exponent, and the 23 F bits are
the fraction. These represent a value, V.
If E=255 and F is nonzero, then V=NaN ("Not a number")
If E=255 and F is zero and S is 1, then V=-Infinity
If E=255 and F is zero and S is 0, then V=Infinity
If 0<E<255 then V=(-1)^S * 2^(E-1028) * (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^(-127) * (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_FLOAT(x) (*((float*)((void*)&x)))
int __cdecl main(int argc, char **argv)
{
/*non-finite numbers*/
UINT32 lsnan = 0xffffffffu;
UINT32 lqnan = 0x7fffffffu;
UINT32 lneginf = 0xff800000u;
UINT32 lposinf = 0x7f800000u;
float snan = TO_FLOAT(lsnan);
float qnan = TO_FLOAT(lqnan);
float neginf = TO_FLOAT(lneginf);
float posinf = TO_FLOAT(lposinf);
/*finite numbers*/
UINT32 lnegunnormalized = 0x807fffffu;
UINT32 lposunnormalized = 0x007fffffu;
UINT32 lnegzero = 0x80000000u;
float negunnormalized = TO_FLOAT(lnegunnormalized);
float posunnormalized = TO_FLOAT(lposunnormalized);
float negzero = TO_FLOAT(lnegzero);
/*
* Initialize the PAL and return FAIL if this fails
*/
if (PAL_Initialize(argc, argv) != 0)
{
return FAIL;
}
/*non-finite numbers*/
if (_finitef(snan) || _finitef(qnan))
{
Fail("_finitef() found NAN to be finite.\n");
}
if (_finitef(neginf))
{
Fail("_finitef() found negative infinity to be finite.\n");
}
if (_finitef(posinf))
{
Fail("_finitef() found infinity to be finite.\n");
}
/*finite numbers*/
if (!_finitef(negunnormalized))
{
Fail("_finitef() found a negative unnormalized value to be infinite.\n");
}
if (!_finitef(posunnormalized))
{
Fail("_finitef() found an unnormalized value to be infinite.\n");
}
if (!_finitef(negzero))
{
Fail("_finitef() found negative zero to be infinite.\n");
}
if (!_finitef(+0.0f))
{
Fail("_finitef() found zero to be infinite.\n");
}
if (!_finitef(-123.456f))
{
Fail("_finitef() found %f to be infinite.\n", -123.456f);
}
if (!_finitef(+123.456f))
{
Fail("_finitef() found %f to be infinite.\n", +123.456f);
}
PAL_Terminate();
return PASS;
}
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