text: /******************************************************************************
    Copyright (c) 2011, Intel Corp.
    All rights reserved.
  
    Redistribution and use in source and binary forms, with or without 
    modification, are permitted provided that the following conditions are met:
  
      * Redistributions of source code must retain the above copyright notice, 
        this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above copyright 
        notice, this list of conditions and the following disclaimer in the 
        documentation and/or other materials provided with the distribution.
      * Neither the name of Intel Corporation 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
    THE POSSIBILITY OF SUCH DAMAGE.
  ******************************************************************************/
  
  #include "bid_internal.h"
  
  /*****************************************************************************
   *  BID128 fdim
   ****************************************************************************/
  
  /*
   fdim returns x - y if x > y, and +0 is x <= y
   Exceptions: P, O, I (U could only be unmasked, which is not supported)
   */
  
  BID128_FUNCTION_ARG2 (bid128_fdim, x, y)
    BID_UINT128 res;
    int cmpres;
    BID_FPSC tmp_fpsf = 0; // dummy fpsf for calls to comparison functions
  
    tmp_fpsf = *pfpsf;    // save fpsf
  #if DECIMAL_CALL_BY_REFERENCE
    bid128_quiet_greater (&cmpres, &x, &y 
        _EXC_FLAGS_ARG _EXC_MASKS_ARG _EXC_INFO_ARG);
  #else    
    cmpres = bid128_quiet_greater (x, y 
        _EXC_FLAGS_ARG _EXC_MASKS_ARG _EXC_INFO_ARG);
  #endif 
    *pfpsf = tmp_fpsf;    // restore fpsf
    if (((x.w[BID_HIGH_128W] & MASK_NAN) != MASK_NAN) && ((y.w[BID_HIGH_128W] & MASK_NAN) != MASK_NAN) &&
        !cmpres) { // if x != NaN and y != NaN and x <= y return +0
      res.w[BID_HIGH_128W] = 0x3040000000000000ull;
      res.w[BID_LOW_128W] = 0x0000000000000000ull;
      BID_RETURN (res);
    }
  
    // else if x = NaN or y = NaN or x > y return x - y
  
  #if DECIMAL_CALL_BY_REFERENCE
    bid128_sub (&res, &x, &y 
        _RND_MODE_ARG _EXC_FLAGS_ARG _EXC_MASKS_ARG _EXC_INFO_ARG);
  #else
    res = bid128_sub (x, y 
        _RND_MODE_ARG _EXC_FLAGS_ARG _EXC_MASKS_ARG _EXC_INFO_ARG);
  #endif
    BID_RETURN (res);
  }
  