softfloat/source/8086/s_f128MToCommonNaN.c

   1
   2 /*============================================================================
   3
   4 This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
   5 Package, Release 3e, by John R. Hauser.
   6
   7 Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
   8 All rights reserved.
   9
  10 Redistribution and use in source and binary forms, with or without
  11 modification, are permitted provided that the following conditions are met:
  12
  13  1. Redistributions of source code must retain the above copyright notice,
  14     this list of conditions, and the following disclaimer.
  15
  16  2. Redistributions in binary form must reproduce the above copyright notice,
  17     this list of conditions, and the following disclaimer in the documentation
  18     and/or other materials provided with the distribution.
  19
  20  3. Neither the name of the University nor the names of its contributors may
  21     be used to endorse or promote products derived from this software without
  22     specific prior written permission.
  23
  24 THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
  25 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  26 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
  27 DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
  28 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  31 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34
  35 =============================================================================*/
  36
  37 #include <stdint.h>
  38 #include "platform.h"
  39 #include "primitives.h"
  40 #include "specialize.h"
  41 #include "softfloat.h"
  42
  43 /*----------------------------------------------------------------------------
  44 | Assuming the 128-bit floating-point value pointed to by `aWPtr' is a NaN,
  45 | converts this NaN to the common NaN form, and stores the resulting common
  46 | NaN at the location pointed to by `zPtr'.  If the NaN is a signaling NaN,
  47 | the invalid exception is raised.  Argument `aWPtr' points to an array of
  48 | four 32-bit elements that concatenate in the platform's normal endian order
  49 | to form a 128-bit floating-point value.
  50 *----------------------------------------------------------------------------*/
  51 void
  52  softfloat_f128MToCommonNaN( const uint32_t *aWPtr, struct commonNaN *zPtr )
  53 {
  54
  55     if ( f128M_isSignalingNaN( (const float128_t *) aWPtr ) ) {
  56         softfloat_raiseFlags( softfloat_flag_invalid );
  57     }
  58     zPtr->sign = aWPtr[indexWordHi( 4 )]>>31;
  59     softfloat_shortShiftLeft128M( aWPtr, 16, (uint32_t *) &zPtr->v0 );
  60
  61 }
  62