s_f128MToCommonNaN.c

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/*============================================================================
 
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3e, by John R. Hauser.
 
Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
All rights reserved.
 
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modification, are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice,
    this list of conditions, and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions, and the following disclaimer in the documentation
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 3. Neither the name of the University nor the names of its contributors may
    be used to endorse or promote products derived from this software without
    specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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=============================================================================*/
 
#include <stdint.h>
#include "platform.h"
#include "primitives.h"
#include "specialize.h"
#include "softfloat.h"
 
/*----------------------------------------------------------------------------
| Assuming the 128-bit floating-point value pointed to by `aWPtr' is a NaN,
| converts this NaN to the common NaN form, and stores the resulting common
| NaN at the location pointed to by `zPtr'.  If the NaN is a signaling NaN,
| the invalid exception is raised.  Argument `aWPtr' points to an array of
| four 32-bit elements that concatenate in the platform's normal endian order
| to form a 128-bit floating-point value.
*----------------------------------------------------------------------------*/
void
 softfloat_f128MToCommonNaN( const uint32_t *aWPtr, struct commonNaN *zPtr )
{
 
    if ( f128M_isSignalingNaN( (const float128_t *) aWPtr ) ) {
        softfloat_raiseFlags( softfloat_flag_invalid );
    }
    zPtr->sign = aWPtr[indexWordHi( 4 )]>>31;
    softfloat_shortShiftLeft128M( aWPtr, 16, (uint32_t *) &zPtr->v0 );
 
}