/* Copyright (C) 2007  Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file.  (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */

#define BID_128RES
#include "bid_internal.h"

/*****************************************************************************
 *  BID128 nextup
 ****************************************************************************/

#if DECIMAL_CALL_BY_REFERENCE
void
bid128_nextup (UINT128 * pres,
	       UINT128 *
	       px _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) {
  UINT128 x = *px;
#else
UINT128
bid128_nextup (UINT128 x _EXC_FLAGS_PARAM _EXC_MASKS_PARAM
	       _EXC_INFO_PARAM) {
#endif

  UINT128 res;
  UINT64 x_sign;
  UINT64 x_exp;
  int exp;
  BID_UI64DOUBLE tmp1;
  int x_nr_bits;
  int q1, ind;
  UINT128 C1;			// C1.w[1], C1.w[0] represent x_signif_hi, x_signif_lo (UINT64)

  BID_SWAP128 (x);
  // unpack the argument
  x_sign = x.w[1] & MASK_SIGN;	// 0 for positive, MASK_SIGN for negative
  C1.w[1] = x.w[1] & MASK_COEFF;
  C1.w[0] = x.w[0];

  // check for NaN or Infinity
  if ((x.w[1] & MASK_SPECIAL) == MASK_SPECIAL) {
    // x is special
    if ((x.w[1] & MASK_NAN) == MASK_NAN) {	// x is NAN
      // if x = NaN, then res = Q (x)
      // check first for non-canonical NaN payload
      if (((x.w[1] & 0x00003fffffffffffull) > 0x0000314dc6448d93ull) ||
	  (((x.w[1] & 0x00003fffffffffffull) == 0x0000314dc6448d93ull)
	   && (x.w[0] > 0x38c15b09ffffffffull))) {
	x.w[1] = x.w[1] & 0xffffc00000000000ull;
	x.w[0] = 0x0ull;
      }
      if ((x.w[1] & MASK_SNAN) == MASK_SNAN) {	// x is SNAN
	// set invalid flag
	*pfpsf |= INVALID_EXCEPTION;
	// return quiet (x)
	res.w[1] = x.w[1] & 0xfc003fffffffffffull;	// clear out also G[6]-G[16]
	res.w[0] = x.w[0];
      } else {	// x is QNaN
	// return x
	res.w[1] = x.w[1] & 0xfc003fffffffffffull;	// clear out G[6]-G[16]
	res.w[0] = x.w[0];
      }
    } else {	// x is not NaN, so it must be infinity
      if (!x_sign) {	// x is +inf
	res.w[1] = 0x7800000000000000ull;	// +inf
	res.w[0] = 0x0000000000000000ull;
      } else {	// x is -inf
	res.w[1] = 0xdfffed09bead87c0ull;	// -MAXFP = -999...99 * 10^emax
	res.w[0] = 0x378d8e63ffffffffull;
      }
    }
    BID_RETURN (res);
  }
  // check for non-canonical values (treated as zero)
  if ((x.w[1] & 0x6000000000000000ull) == 0x6000000000000000ull) {	// G0_G1=11
    // non-canonical
    x_exp = (x.w[1] << 2) & MASK_EXP;	// biased and shifted left 49 bits
    C1.w[1] = 0;	// significand high
    C1.w[0] = 0;	// significand low
  } else {	// G0_G1 != 11
    x_exp = x.w[1] & MASK_EXP;	// biased and shifted left 49 bits
    if (C1.w[1] > 0x0001ed09bead87c0ull ||
	(C1.w[1] == 0x0001ed09bead87c0ull
	 && C1.w[0] > 0x378d8e63ffffffffull)) {
      // x is non-canonical if coefficient is larger than 10^34 -1
      C1.w[1] = 0;
      C1.w[0] = 0;
    } else {	// canonical
      ;
    }
  }

  if ((C1.w[1] == 0x0ull) && (C1.w[0] == 0x0ull)) {
    // x is +/-0
    res.w[1] = 0x0000000000000000ull;	// +1 * 10^emin
    res.w[0] = 0x0000000000000001ull;
  } else {	// x is not special and is not zero
    if (x.w[1] == 0x5fffed09bead87c0ull
	&& x.w[0] == 0x378d8e63ffffffffull) {
      // x = +MAXFP = 999...99 * 10^emax
      res.w[1] = 0x7800000000000000ull;	// +inf
      res.w[0] = 0x0000000000000000ull;
    } else if (x.w[1] == 0x8000000000000000ull
	       && x.w[0] == 0x0000000000000001ull) {
      // x = -MINFP = 1...99 * 10^emin
      res.w[1] = 0x8000000000000000ull;	// -0
      res.w[0] = 0x0000000000000000ull;
    } else {	// -MAXFP <= x <= -MINFP - 1 ulp OR MINFP <= x <= MAXFP - 1 ulp
      // can add/subtract 1 ulp to the significand

      // Note: we could check here if x >= 10^34 to speed up the case q1 = 34
      // q1 = nr. of decimal digits in x
      // determine first the nr. of bits in x
      if (C1.w[1] == 0) {
	if (C1.w[0] >= 0x0020000000000000ull) {	// x >= 2^53
	  // split the 64-bit value in two 32-bit halves to avoid rnd errors
	  if (C1.w[0] >= 0x0000000100000000ull) {	// x >= 2^32
	    tmp1.d = (double) (C1.w[0] >> 32);	// exact conversion
	    x_nr_bits =
	      33 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) -
		    0x3ff);
	  } else {	// x < 2^32
	    tmp1.d = (double) (C1.w[0]);	// exact conversion
	    x_nr_bits =
	      1 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) -
		   0x3ff);
	  }
	} else {	// if x < 2^53
	  tmp1.d = (double) C1.w[0];	// exact conversion
	  x_nr_bits =
	    1 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) - 0x3ff);
	}
      } else {	// C1.w[1] != 0 => nr. bits = 64 + nr_bits (C1.w[1])
	tmp1.d = (double) C1.w[1];	// exact conversion
	x_nr_bits =
	  65 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) - 0x3ff);
      }
      q1 = nr_digits[x_nr_bits - 1].digits;
      if (q1 == 0) {
	q1 = nr_digits[x_nr_bits - 1].digits1;
	if (C1.w[1] > nr_digits[x_nr_bits - 1].threshold_hi
	    || (C1.w[1] == nr_digits[x_nr_bits - 1].threshold_hi
		&& C1.w[0] >= nr_digits[x_nr_bits - 1].threshold_lo))
	  q1++;
      }
      // if q1 < P34 then pad the significand with zeros
      if (q1 < P34) {
	exp = (x_exp >> 49) - 6176;
	if (exp + 6176 > P34 - q1) {
	  ind = P34 - q1;	// 1 <= ind <= P34 - 1
	  // pad with P34 - q1 zeros, until exponent = emin
	  // C1 = C1 * 10^ind
	  if (q1 <= 19) {	// 64-bit C1
	    if (ind <= 19) {	// 64-bit 10^ind and 64-bit C1
	      __mul_64x64_to_128MACH (C1, C1.w[0], ten2k64[ind]);
	    } else {	// 128-bit 10^ind and 64-bit C1
	      __mul_128x64_to_128 (C1, C1.w[0], ten2k128[ind - 20]);
	    }
	  } else {	// C1 is (most likely) 128-bit
	    if (ind <= 14) {	// 64-bit 10^ind and 128-bit C1 (most likely)
	      __mul_128x64_to_128 (C1, ten2k64[ind], C1);
	    } else if (ind <= 19) {	// 64-bit 10^ind and 64-bit C1 (q1 <= 19)
	      __mul_64x64_to_128MACH (C1, C1.w[0], ten2k64[ind]);
	    } else {	// 128-bit 10^ind and 64-bit C1 (C1 must be 64-bit)
	      __mul_128x64_to_128 (C1, C1.w[0], ten2k128[ind - 20]);
	    }
	  }
	  x_exp = x_exp - ((UINT64) ind << 49);
	} else {	// pad with zeros until the exponent reaches emin
	  ind = exp + 6176;
	  // C1 = C1 * 10^ind
	  if (ind <= 19) {	// 1 <= P34 - q1 <= 19 <=> 15 <= q1 <= 33
	    if (q1 <= 19) {	// 64-bit C1, 64-bit 10^ind 
	      __mul_64x64_to_128MACH (C1, C1.w[0], ten2k64[ind]);
	    } else {	// 20 <= q1 <= 33 => 128-bit C1, 64-bit 10^ind
	      __mul_128x64_to_128 (C1, ten2k64[ind], C1);
	    }
	  } else {	// if 20 <= P34 - q1 <= 33 <=> 1 <= q1 <= 14 =>
	    // 64-bit C1, 128-bit 10^ind
	    __mul_128x64_to_128 (C1, C1.w[0], ten2k128[ind - 20]);
	  }
	  x_exp = EXP_MIN;
	}
      }
      if (!x_sign) {	// x > 0
	// add 1 ulp (add 1 to the significand)
	C1.w[0]++;
	if (C1.w[0] == 0)
	  C1.w[1]++;
	if (C1.w[1] == 0x0001ed09bead87c0ull && C1.w[0] == 0x378d8e6400000000ull) {	// if  C1 = 10^34
	  C1.w[1] = 0x0000314dc6448d93ull;	// C1 = 10^33
	  C1.w[0] = 0x38c15b0a00000000ull;
	  x_exp = x_exp + EXP_P1;
	}
      } else {	// x < 0
	// subtract 1 ulp (subtract 1 from the significand)
	C1.w[0]--;
	if (C1.w[0] == 0xffffffffffffffffull)
	  C1.w[1]--;
	if (x_exp != 0 && C1.w[1] == 0x0000314dc6448d93ull && C1.w[0] == 0x38c15b09ffffffffull) {	// if  C1 = 10^33 - 1
	  C1.w[1] = 0x0001ed09bead87c0ull;	// C1 = 10^34 - 1
	  C1.w[0] = 0x378d8e63ffffffffull;
	  x_exp = x_exp - EXP_P1;
	}
      }
      // assemble the result
      res.w[1] = x_sign | x_exp | C1.w[1];
      res.w[0] = C1.w[0];
    }	// end -MAXFP <= x <= -MINFP - 1 ulp OR MINFP <= x <= MAXFP - 1 ulp
  }	// end x is not special and is not zero
  BID_RETURN (res);
}

/*****************************************************************************
 *  BID128 nextdown
 ****************************************************************************/

#if DECIMAL_CALL_BY_REFERENCE
void
bid128_nextdown (UINT128 * pres,
		 UINT128 *
		 px _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) {
  UINT128 x = *px;
#else
UINT128
bid128_nextdown (UINT128 x _EXC_FLAGS_PARAM _EXC_MASKS_PARAM
		 _EXC_INFO_PARAM) {
#endif

  UINT128 res;
  UINT64 x_sign;
  UINT64 x_exp;
  int exp;
  BID_UI64DOUBLE tmp1;
  int x_nr_bits;
  int q1, ind;
  UINT128 C1;			// C1.w[1], C1.w[0] represent x_signif_hi, x_signif_lo (UINT64)

  BID_SWAP128 (x);
  // unpack the argument
  x_sign = x.w[1] & MASK_SIGN;	// 0 for positive, MASK_SIGN for negative
  C1.w[1] = x.w[1] & MASK_COEFF;
  C1.w[0] = x.w[0];

  // check for NaN or Infinity
  if ((x.w[1] & MASK_SPECIAL) == MASK_SPECIAL) {
    // x is special
    if ((x.w[1] & MASK_NAN) == MASK_NAN) {	// x is NAN
      // if x = NaN, then res = Q (x)
      // check first for non-canonical NaN payload
      if (((x.w[1] & 0x00003fffffffffffull) > 0x0000314dc6448d93ull) ||
	  (((x.w[1] & 0x00003fffffffffffull) == 0x0000314dc6448d93ull)
	   && (x.w[0] > 0x38c15b09ffffffffull))) {
	x.w[1] = x.w[1] & 0xffffc00000000000ull;
	x.w[0] = 0x0ull;
      }
      if ((x.w[1] & MASK_SNAN) == MASK_SNAN) {	// x is SNAN
	// set invalid flag
	*pfpsf |= INVALID_EXCEPTION;
	// return quiet (x)
	res.w[1] = x.w[1] & 0xfc003fffffffffffull;	// clear out also G[6]-G[16]
	res.w[0] = x.w[0];
      } else {	// x is QNaN
	// return x
	res.w[1] = x.w[1] & 0xfc003fffffffffffull;	// clear out G[6]-G[16]
	res.w[0] = x.w[0];
      }
    } else {	// x is not NaN, so it must be infinity
      if (!x_sign) {	// x is +inf
	res.w[1] = 0x5fffed09bead87c0ull;	// +MAXFP = +999...99 * 10^emax
	res.w[0] = 0x378d8e63ffffffffull;
      } else {	// x is -inf
	res.w[1] = 0xf800000000000000ull;	// -inf
	res.w[0] = 0x0000000000000000ull;
      }
    }
    BID_RETURN (res);
  }
  // check for non-canonical values (treated as zero)
  if ((x.w[1] & 0x6000000000000000ull) == 0x6000000000000000ull) {	// G0_G1=11
    // non-canonical
    x_exp = (x.w[1] << 2) & MASK_EXP;	// biased and shifted left 49 bits
    C1.w[1] = 0;	// significand high
    C1.w[0] = 0;	// significand low
  } else {	// G0_G1 != 11
    x_exp = x.w[1] & MASK_EXP;	// biased and shifted left 49 bits
    if (C1.w[1] > 0x0001ed09bead87c0ull ||
	(C1.w[1] == 0x0001ed09bead87c0ull
	 && C1.w[0] > 0x378d8e63ffffffffull)) {
      // x is non-canonical if coefficient is larger than 10^34 -1
      C1.w[1] = 0;
      C1.w[0] = 0;
    } else {	// canonical
      ;
    }
  }

  if ((C1.w[1] == 0x0ull) && (C1.w[0] == 0x0ull)) {
    // x is +/-0
    res.w[1] = 0x8000000000000000ull;	// -1 * 10^emin
    res.w[0] = 0x0000000000000001ull;
  } else {	// x is not special and is not zero
    if (x.w[1] == 0xdfffed09bead87c0ull
	&& x.w[0] == 0x378d8e63ffffffffull) {
      // x = -MAXFP = -999...99 * 10^emax
      res.w[1] = 0xf800000000000000ull;	// -inf
      res.w[0] = 0x0000000000000000ull;
    } else if (x.w[1] == 0x0ull && x.w[0] == 0x0000000000000001ull) {	// +MINFP
      res.w[1] = 0x0000000000000000ull;	// +0
      res.w[0] = 0x0000000000000000ull;
    } else {	// -MAXFP <= x <= -MINFP - 1 ulp OR MINFP <= x <= MAXFP - 1 ulp
      // can add/subtract 1 ulp to the significand

      // Note: we could check here if x >= 10^34 to speed up the case q1 = 34
      // q1 = nr. of decimal digits in x
      // determine first the nr. of bits in x
      if (C1.w[1] == 0) {
	if (C1.w[0] >= 0x0020000000000000ull) {	// x >= 2^53
	  // split the 64-bit value in two 32-bit halves to avoid rnd errors
	  if (C1.w[0] >= 0x0000000100000000ull) {	// x >= 2^32
	    tmp1.d = (double) (C1.w[0] >> 32);	// exact conversion
	    x_nr_bits =
	      33 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) -
		    0x3ff);
	  } else {	// x < 2^32
	    tmp1.d = (double) (C1.w[0]);	// exact conversion
	    x_nr_bits =
	      1 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) -
		   0x3ff);
	  }
	} else {	// if x < 2^53
	  tmp1.d = (double) C1.w[0];	// exact conversion
	  x_nr_bits =
	    1 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) - 0x3ff);
	}
      } else {	// C1.w[1] != 0 => nr. bits = 64 + nr_bits (C1.w[1])
	tmp1.d = (double) C1.w[1];	// exact conversion
	x_nr_bits =
	  65 + ((((unsigned int) (tmp1.ui64 >> 52)) & 0x7ff) - 0x3ff);
      }
      q1 = nr_digits[x_nr_bits - 1].digits;
      if (q1 == 0) {
	q1 = nr_digits[x_nr_bits - 1].digits1;
	if (C1.w[1] > nr_digits[x_nr_bits - 1].threshold_hi
	    || (C1.w[1] == nr_digits[x_nr_bits - 1].threshold_hi
		&& C1.w[0] >= nr_digits[x_nr_bits - 1].threshold_lo))
	  q1++;
      }
      // if q1 < P then pad the significand with zeros
      if (q1 < P34) {
	exp = (x_exp >> 49) - 6176;
	if (exp + 6176 > P34 - q1) {
	  ind = P34 - q1;	// 1 <= ind <= P34 - 1
	  // pad with P34 - q1 zeros, until exponent = emin
	  // C1 = C1 * 10^ind
	  if (q1 <= 19) {	// 64-bit C1
	    if (ind <= 19) {	// 64-bit 10^ind and 64-bit C1
	      __mul_64x64_to_128MACH (C1, C1.w[0], ten2k64[ind]);
	    } else {	// 128-bit 10^ind and 64-bit C1
	      __mul_128x64_to_128 (C1, C1.w[0], ten2k128[ind - 20]);
	    }
	  } else {	// C1 is (most likely) 128-bit
	    if (ind <= 14) {	// 64-bit 10^ind and 128-bit C1 (most likely)
	      __mul_128x64_to_128 (C1, ten2k64[ind], C1);
	    } else if (ind <= 19) {	// 64-bit 10^ind and 64-bit C1 (q1 <= 19)
	      __mul_64x64_to_128MACH (C1, C1.w[0], ten2k64[ind]);
	    } else {	// 128-bit 10^ind and 64-bit C1 (C1 must be 64-bit)
	      __mul_128x64_to_128 (C1, C1.w[0], ten2k128[ind - 20]);
	    }
	  }
	  x_exp = x_exp - ((UINT64) ind << 49);
	} else {	// pad with zeros until the exponent reaches emin
	  ind = exp + 6176;
	  // C1 = C1 * 10^ind
	  if (ind <= 19) {	// 1 <= P34 - q1 <= 19 <=> 15 <= q1 <= 33
	    if (q1 <= 19) {	// 64-bit C1, 64-bit 10^ind 
	      __mul_64x64_to_128MACH (C1, C1.w[0], ten2k64[ind]);
	    } else {	// 20 <= q1 <= 33 => 128-bit C1, 64-bit 10^ind
	      __mul_128x64_to_128 (C1, ten2k64[ind], C1);
	    }
	  } else {	// if 20 <= P34 - q1 <= 33 <=> 1 <= q1 <= 14 =>
	    // 64-bit C1, 128-bit 10^ind
	    __mul_128x64_to_128 (C1, C1.w[0], ten2k128[ind - 20]);
	  }
	  x_exp = EXP_MIN;
	}
      }
      if (x_sign) {	// x < 0
	// add 1 ulp (add 1 to the significand)
	C1.w[0]++;
	if (C1.w[0] == 0)
	  C1.w[1]++;
	if (C1.w[1] == 0x0001ed09bead87c0ull && C1.w[0] == 0x378d8e6400000000ull) {	// if  C1 = 10^34
	  C1.w[1] = 0x0000314dc6448d93ull;	// C1 = 10^33
	  C1.w[0] = 0x38c15b0a00000000ull;
	  x_exp = x_exp + EXP_P1;
	}
      } else {	// x > 0
	// subtract 1 ulp (subtract 1 from the significand)
	C1.w[0]--;
	if (C1.w[0] == 0xffffffffffffffffull)
	  C1.w[1]--;
	if (x_exp != 0 && C1.w[1] == 0x0000314dc6448d93ull && C1.w[0] == 0x38c15b09ffffffffull) {	// if  C1 = 10^33 - 1
	  C1.w[1] = 0x0001ed09bead87c0ull;	// C1 = 10^34 - 1
	  C1.w[0] = 0x378d8e63ffffffffull;
	  x_exp = x_exp - EXP_P1;
	}
      }
      // assemble the result
      res.w[1] = x_sign | x_exp | C1.w[1];
      res.w[0] = C1.w[0];
    }	// end -MAXFP <= x <= -MINFP - 1 ulp OR MINFP <= x <= MAXFP - 1 ulp
  }	// end x is not special and is not zero
  BID_RETURN (res);
}

/*****************************************************************************
 *  BID128 nextafter
 ****************************************************************************/

#if DECIMAL_CALL_BY_REFERENCE
void
bid128_nextafter (UINT128 * pres, UINT128 * px,
		  UINT128 *
		  py _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) 
{
  UINT128 x = *px;
  UINT128 y = *py;
  UINT128 xnswp = *px;
  UINT128 ynswp = *py;
#else
UINT128
bid128_nextafter (UINT128 x,
		  UINT128 y _EXC_FLAGS_PARAM _EXC_MASKS_PARAM
		  _EXC_INFO_PARAM) {
  UINT128 xnswp = x;
  UINT128 ynswp = y;
#endif

  UINT128 res;
  UINT128 tmp1, tmp2, tmp3;
  FPSC tmp_fpsf = 0;		// dummy fpsf for calls to comparison functions
  int res1, res2;
  UINT64 x_exp;


  BID_SWAP128 (x);
  BID_SWAP128 (y);
  // check for NaNs
  if (((x.w[1] & MASK_SPECIAL) == MASK_SPECIAL)
      || ((y.w[1] & MASK_SPECIAL) == MASK_SPECIAL)) {
    // x is special or y is special
    if ((x.w[1] & MASK_NAN) == MASK_NAN) {	// x is NAN
      // if x = NaN, then res = Q (x)
      // check first for non-canonical NaN payload
      if (((x.w[1] & 0x00003fffffffffffull) > 0x0000314dc6448d93ull) ||
	  (((x.w[1] & 0x00003fffffffffffull) == 0x0000314dc6448d93ull)
	   && (x.w[0] > 0x38c15b09ffffffffull))) {
	x.w[1] = x.w[1] & 0xffffc00000000000ull;
	x.w[0] = 0x0ull;
      }
      if ((x.w[1] & MASK_SNAN) == MASK_SNAN) {	// x is SNAN
	// set invalid flag
	*pfpsf |= INVALID_EXCEPTION;
	// return quiet (x)
	res.w[1] = x.w[1] & 0xfc003fffffffffffull;	// clear out also G[6]-G[16]
	res.w[0] = x.w[0];
      } else {	// x is QNaN
	// return x
	res.w[1] = x.w[1] & 0xfc003fffffffffffull;	// clear out G[6]-G[16]
	res.w[0] = x.w[0];
	if ((y.w[1] & MASK_SNAN) == MASK_SNAN) {	// y is SNAN
	  // set invalid flag
	  *pfpsf |= INVALID_EXCEPTION;
	}
      }
      BID_RETURN (res)
    } else if ((y.w[1] & MASK_NAN) == MASK_NAN) {	// y is NAN
      // if x = NaN, then res = Q (x)
      // check first for non-canonical NaN payload
      if (((y.w[1] & 0x00003fffffffffffull) > 0x0000314dc6448d93ull) ||
	  (((y.w[1] & 0x00003fffffffffffull) == 0x0000314dc6448d93ull)
	   && (y.w[0] > 0x38c15b09ffffffffull))) {
	y.w[1] = y.w[1] & 0xffffc00000000000ull;
	y.w[0] = 0x0ull;
      }
      if ((y.w[1] & MASK_SNAN) == MASK_SNAN) {	// y is SNAN
	// set invalid flag
	*pfpsf |= INVALID_EXCEPTION;
	// return quiet (x)
	res.w[1] = y.w[1] & 0xfc003fffffffffffull;	// clear out also G[6]-G[16]
	res.w[0] = y.w[0];
      } else {	// x is QNaN
	// return x
	res.w[1] = y.w[1] & 0xfc003fffffffffffull;	// clear out G[6]-G[16]
	res.w[0] = y.w[0];
      }
      BID_RETURN (res)
    } else {	// at least one is infinity
      if ((x.w[1] & MASK_ANY_INF) == MASK_INF) {	// x = inf
	x.w[1] = x.w[1] & (MASK_SIGN | MASK_INF);
	x.w[0] = 0x0ull;
      }
      if ((y.w[1] & MASK_ANY_INF) == MASK_INF) {	// y = inf
	y.w[1] = y.w[1] & (MASK_SIGN | MASK_INF);
	y.w[0] = 0x0ull;
      }
    }
  }
  // neither x nor y is NaN

  // if not infinity, check for non-canonical values x (treated as zero)
  if ((x.w[1] & MASK_ANY_INF) != MASK_INF) {	// x != inf
    if ((x.w[1] & 0x6000000000000000ull) == 0x6000000000000000ull) {	// G0_G1=11
      // non-canonical
      x_exp = (x.w[1] << 2) & MASK_EXP;	// biased and shifted left 49 bits
      x.w[1] = (x.w[1] & MASK_SIGN) | x_exp;
      x.w[0] = 0x0ull;
    } else {	// G0_G1 != 11
      x_exp = x.w[1] & MASK_EXP;	// biased and shifted left 49 bits
      if ((x.w[1] & MASK_COEFF) > 0x0001ed09bead87c0ull ||
	  ((x.w[1] & MASK_COEFF) == 0x0001ed09bead87c0ull
	   && x.w[0] > 0x378d8e63ffffffffull)) {
	// x is non-canonical if coefficient is larger than 10^34 -1
	x.w[1] = (x.w[1] & MASK_SIGN) | x_exp;
	x.w[0] = 0x0ull;
      } else {	// canonical
	;
      }
    }
  }
  // no need to check for non-canonical y

  // neither x nor y is NaN
  tmp_fpsf = *pfpsf;	// save fpsf
#if DECIMAL_CALL_BY_REFERENCE
  bid128_quiet_equal (&res1, &xnswp,
		      &ynswp _EXC_FLAGS_ARG _EXC_MASKS_ARG
		      _EXC_INFO_ARG);
  bid128_quiet_greater (&res2, &xnswp,
			&ynswp _EXC_FLAGS_ARG _EXC_MASKS_ARG
			_EXC_INFO_ARG);
#else
  res1 =
    bid128_quiet_equal (xnswp,
			ynswp _EXC_FLAGS_ARG _EXC_MASKS_ARG
			_EXC_INFO_ARG);
  res2 =
    bid128_quiet_greater (xnswp,
			  ynswp _EXC_FLAGS_ARG _EXC_MASKS_ARG
			  _EXC_INFO_ARG);
#endif
  *pfpsf = tmp_fpsf;	// restore fpsf

  if (res1) {	// x = y
    // return x with the sign of y
    res.w[1] =
      (x.w[1] & 0x7fffffffffffffffull) | (y.
					  w[1] & 0x8000000000000000ull);
    res.w[0] = x.w[0];
  } else if (res2) {	// x > y
#if DECIMAL_CALL_BY_REFERENCE
    bid128_nextdown (&res,
		     &xnswp _EXC_FLAGS_ARG _EXC_MASKS_ARG
		     _EXC_INFO_ARG);
#else
    res =
      bid128_nextdown (xnswp _EXC_FLAGS_ARG _EXC_MASKS_ARG
		       _EXC_INFO_ARG);
#endif
    BID_SWAP128 (res);
  } else {	// x < y
#if DECIMAL_CALL_BY_REFERENCE
    bid128_nextup (&res,
		   &xnswp _EXC_FLAGS_ARG _EXC_MASKS_ARG _EXC_INFO_ARG);
#else
    res =
      bid128_nextup (xnswp _EXC_FLAGS_ARG _EXC_MASKS_ARG _EXC_INFO_ARG);
#endif
    BID_SWAP128 (res);
  }
  // if the operand x is finite but the result is infinite, signal 
  // overflow and inexact
  if (((x.w[1] & MASK_SPECIAL) != MASK_SPECIAL)
      && ((res.w[1] & MASK_SPECIAL) == MASK_SPECIAL)) {
    // set the inexact flag
    *pfpsf |= INEXACT_EXCEPTION;
    // set the overflow flag
    *pfpsf |= OVERFLOW_EXCEPTION;
  }
  // if the result is in (-10^emin, 10^emin), and is different from the
  // operand x, signal underflow and inexact
  tmp1.w[HIGH_128W] = 0x0000314dc6448d93ull;
  tmp1.w[LOW_128W] = 0x38c15b0a00000000ull;	// +100...0[34] * 10^emin
  tmp2.w[HIGH_128W] = res.w[1] & 0x7fffffffffffffffull;
  tmp2.w[LOW_128W] = res.w[0];
  tmp3.w[HIGH_128W] = res.w[1];
  tmp3.w[LOW_128W] = res.w[0];
  tmp_fpsf = *pfpsf;	// save fpsf
#if DECIMAL_CALL_BY_REFERENCE
  bid128_quiet_greater (&res1, &tmp1,
			&tmp2 _EXC_FLAGS_ARG _EXC_MASKS_ARG
			_EXC_INFO_ARG);
  bid128_quiet_not_equal (&res2, &xnswp,
			  &tmp3 _EXC_FLAGS_ARG _EXC_MASKS_ARG
			  _EXC_INFO_ARG);
#else
  res1 =
    bid128_quiet_greater (tmp1,
			  tmp2 _EXC_FLAGS_ARG _EXC_MASKS_ARG
			  _EXC_INFO_ARG);
  res2 =
    bid128_quiet_not_equal (xnswp,
			    tmp3 _EXC_FLAGS_ARG _EXC_MASKS_ARG
			    _EXC_INFO_ARG);
#endif
  *pfpsf = tmp_fpsf;	// restore fpsf
  if (res1 && res2) {
    // set the inexact flag 
    *pfpsf |= INEXACT_EXCEPTION;
    // set the underflow flag 
    *pfpsf |= UNDERFLOW_EXCEPTION;
  }
  BID_RETURN (res);
}
