gcc/libgcc/config/libbid/bid128_div.c

/* Copyright (C) 2007-2022 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 3, or (at your option) any later
version.

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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#define BID_128RES
#include "bid_div_macros.h"
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
#include <fenv.h>

#define FE_ALL_FLAGS FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT
#endif

extern UINT32 convert_table[5][128][2];
extern SINT8 factors[][2];
extern UINT8 packed_10000_zeros[];

BID128_FUNCTION_ARG2 (bid128_div, x, y)

     UINT256 CA4, CA4r, P256;
     UINT128 CX, CY, T128, CQ, CR, CA, TP128, Qh, res;
     UINT64 sign_x, sign_y, T, carry64, D, Q_high, Q_low, QX, PD,
       valid_y;
     int_float fx, fy, f64;
     UINT32 QX32, tdigit[3], digit, digit_h, digit_low;
     int exponent_x, exponent_y, bin_index, bin_expon, diff_expon, ed2,
       digits_q, amount;
     int nzeros, i, j, k, d5;
     unsigned rmode;
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
     fexcept_t binaryflags = 0;
#endif

valid_y = unpack_BID128_value (&sign_y, &exponent_y, &CY, y);

  // unpack arguments, check for NaN or Infinity
if (!unpack_BID128_value (&sign_x, &exponent_x, &CX, x)) {
    // test if x is NaN
if ((x.w[1] & 0x7c00000000000000ull) == 0x7c00000000000000ull) {
#ifdef SET_STATUS_FLAGS
  if ((x.w[1] & 0x7e00000000000000ull) == 0x7e00000000000000ull ||	// sNaN
      (y.w[1] & 0x7e00000000000000ull) == 0x7e00000000000000ull)
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[1] = (CX.w[1]) & QUIET_MASK64;
  res.w[0] = CX.w[0];
  BID_RETURN (res);
}
    // x is Infinity?
if ((x.w[1] & 0x7800000000000000ull) == 0x7800000000000000ull) {
  // check if y is Inf. 
  if (((y.w[1] & 0x7c00000000000000ull) == 0x7800000000000000ull))
    // return NaN 
  {
#ifdef SET_STATUS_FLAGS
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    res.w[1] = 0x7c00000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // y is NaN?
  if (((y.w[1] & 0x7c00000000000000ull) != 0x7c00000000000000ull))
    // return NaN 
  {
    // return +/-Inf
    res.w[1] = ((x.w[1] ^ y.w[1]) & 0x8000000000000000ull) |
      0x7800000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
}
    // x is 0
if ((y.w[1] & 0x7800000000000000ull) < 0x7800000000000000ull) {
  if ((!CY.w[0]) && !(CY.w[1] & 0x0001ffffffffffffull)) {
#ifdef SET_STATUS_FLAGS
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    // x=y=0, return NaN
    res.w[1] = 0x7c00000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // return 0
  res.w[1] = (x.w[1] ^ y.w[1]) & 0x8000000000000000ull;
  exponent_x = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS_128;
  if (exponent_x > DECIMAL_MAX_EXPON_128)
    exponent_x = DECIMAL_MAX_EXPON_128;
  else if (exponent_x < 0)
    exponent_x = 0;
  res.w[1] |= (((UINT64) exponent_x) << 49);
  res.w[0] = 0;
  BID_RETURN (res);
}
}
if (!valid_y) {
  // y is Inf. or NaN

  // test if y is NaN
  if ((y.w[1] & 0x7c00000000000000ull) == 0x7c00000000000000ull) {
#ifdef SET_STATUS_FLAGS
    if ((y.w[1] & 0x7e00000000000000ull) == 0x7e00000000000000ull)	// sNaN
      __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    res.w[1] = CY.w[1] & QUIET_MASK64;
    res.w[0] = CY.w[0];
    BID_RETURN (res);
  }
  // y is Infinity?
  if ((y.w[1] & 0x7800000000000000ull) == 0x7800000000000000ull) {
    // return +/-0
    res.w[1] = sign_x ^ sign_y;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // y is 0, return +/-Inf
#ifdef SET_STATUS_FLAGS
  __set_status_flags (pfpsf, ZERO_DIVIDE_EXCEPTION);
#endif
  res.w[1] =
    ((x.w[1] ^ y.w[1]) & 0x8000000000000000ull) | 0x7800000000000000ull;
  res.w[0] = 0;
  BID_RETURN (res);
}
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fegetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
diff_expon = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS_128;

if (__unsigned_compare_gt_128 (CY, CX)) {
  // CX < CY

  // 2^64
  f64.i = 0x5f800000;

  // fx ~ CX,   fy ~ CY
  fx.d = (float) CX.w[1] * f64.d + (float) CX.w[0];
  fy.d = (float) CY.w[1] * f64.d + (float) CY.w[0];
  // expon_cy - expon_cx
  bin_index = (fy.i - fx.i) >> 23;

  if (CX.w[1]) {
    T = power10_index_binexp_128[bin_index].w[0];
    __mul_64x128_short (CA, T, CX);
  } else {
    T128 = power10_index_binexp_128[bin_index];
    __mul_64x128_short (CA, CX.w[0], T128);
  }

  ed2 = 33;
  if (__unsigned_compare_gt_128 (CY, CA))
    ed2++;

  T128 = power10_table_128[ed2];
  __mul_128x128_to_256 (CA4, CA, T128);

  ed2 += estimate_decimal_digits[bin_index];
  CQ.w[0] = CQ.w[1] = 0;
  diff_expon = diff_expon - ed2;

} else {
  // get CQ = CX/CY
  __div_128_by_128 (&CQ, &CR, CX, CY);

  if (!CR.w[1] && !CR.w[0]) {
    get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,
		pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
  // get number of decimal digits in CQ
  // 2^64
  f64.i = 0x5f800000;
  fx.d = (float) CQ.w[1] * f64.d + (float) CQ.w[0];
  // binary expon. of CQ
  bin_expon = (fx.i - 0x3f800000) >> 23;

  digits_q = estimate_decimal_digits[bin_expon];
  TP128.w[0] = power10_index_binexp_128[bin_expon].w[0];
  TP128.w[1] = power10_index_binexp_128[bin_expon].w[1];
  if (__unsigned_compare_ge_128 (CQ, TP128))
    digits_q++;

  ed2 = 34 - digits_q;
  T128.w[0] = power10_table_128[ed2].w[0];
  T128.w[1] = power10_table_128[ed2].w[1];
  __mul_128x128_to_256 (CA4, CR, T128);
  diff_expon = diff_expon - ed2;
  __mul_128x128_low (CQ, CQ, T128);

}

__div_256_by_128 (&CQ, &CA4, CY);

#ifdef SET_STATUS_FLAGS
if (CA4.w[0] || CA4.w[1]) {
  // set status flags
  __set_status_flags (pfpsf, INEXACT_EXCEPTION);
}
#ifndef LEAVE_TRAILING_ZEROS
else
#endif
#else
#ifndef LEAVE_TRAILING_ZEROS
if (!CA4.w[0] && !CA4.w[1])
#endif
#endif
#ifndef LEAVE_TRAILING_ZEROS
  // check whether result is exact
{
  // check whether CX, CY are short
  if (!CX.w[1] && !CY.w[1] && (CX.w[0] <= 1024) && (CY.w[0] <= 1024)) {
    i = (int) CY.w[0] - 1;
    j = (int) CX.w[0] - 1;
    // difference in powers of 2 factors for Y and X
    nzeros = ed2 - factors[i][0] + factors[j][0];
    // difference in powers of 5 factors
    d5 = ed2 - factors[i][1] + factors[j][1];
    if (d5 < nzeros)
      nzeros = d5;
    // get P*(2^M[extra_digits])/10^extra_digits
    __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);

    // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
    amount = recip_scale[nzeros];
    __shr_128_long (CQ, Qh, amount);

    diff_expon += nzeros;
  } else {
    // decompose Q as Qh*10^17 + Ql
    //T128 = reciprocals10_128[17];
    T128.w[0] = 0x44909befeb9fad49ull;
    T128.w[1] = 0x000b877aa3236a4bull;
    __mul_128x128_to_256 (P256, CQ, T128);
    //amount = recip_scale[17];
    Q_high = (P256.w[2] >> 44) | (P256.w[3] << (64 - 44));
    Q_low = CQ.w[0] - Q_high * 100000000000000000ull;

    if (!Q_low) {
      diff_expon += 17;

      tdigit[0] = Q_high & 0x3ffffff;
      tdigit[1] = 0;
      QX = Q_high >> 26;
      QX32 = QX;
      nzeros = 0;

      for (j = 0; QX32; j++, QX32 >>= 7) {
	k = (QX32 & 127);
	tdigit[0] += convert_table[j][k][0];
	tdigit[1] += convert_table[j][k][1];
	if (tdigit[0] >= 100000000) {
	  tdigit[0] -= 100000000;
	  tdigit[1]++;
	}
      }

      if (tdigit[1] >= 100000000) {
	tdigit[1] -= 100000000;
	if (tdigit[1] >= 100000000)
	  tdigit[1] -= 100000000;
      }

      digit = tdigit[0];
      if (!digit && !tdigit[1])
	nzeros += 16;
      else {
	if (!digit) {
	  nzeros += 8;
	  digit = tdigit[1];
	}
	// decompose digit
	PD = (UINT64) digit *0x068DB8BBull;
	digit_h = (UINT32) (PD >> 40);
	digit_low = digit - digit_h * 10000;

	if (!digit_low)
	  nzeros += 4;
	else
	  digit_h = digit_low;

	if (!(digit_h & 1))
	  nzeros +=
	    3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			  (digit_h & 7));
      }

      if (nzeros) {
	__mul_64x64_to_128 (CQ, Q_high, reciprocals10_64[nzeros]);

	// now get P/10^extra_digits: shift C64 right by M[extra_digits]-64
	amount = short_recip_scale[nzeros];
	CQ.w[0] = CQ.w[1] >> amount;
      } else
	CQ.w[0] = Q_high;
      CQ.w[1] = 0;

      diff_expon += nzeros;
    } else {
      tdigit[0] = Q_low & 0x3ffffff;
      tdigit[1] = 0;
      QX = Q_low >> 26;
      QX32 = QX;
      nzeros = 0;

      for (j = 0; QX32; j++, QX32 >>= 7) {
	k = (QX32 & 127);
	tdigit[0] += convert_table[j][k][0];
	tdigit[1] += convert_table[j][k][1];
	if (tdigit[0] >= 100000000) {
	  tdigit[0] -= 100000000;
	  tdigit[1]++;
	}
      }

      if (tdigit[1] >= 100000000) {
	tdigit[1] -= 100000000;
	if (tdigit[1] >= 100000000)
	  tdigit[1] -= 100000000;
      }

      digit = tdigit[0];
      if (!digit && !tdigit[1])
	nzeros += 16;
      else {
	if (!digit) {
	  nzeros += 8;
	  digit = tdigit[1];
	}
	// decompose digit
	PD = (UINT64) digit *0x068DB8BBull;
	digit_h = (UINT32) (PD >> 40);
	digit_low = digit - digit_h * 10000;

	if (!digit_low)
	  nzeros += 4;
	else
	  digit_h = digit_low;

	if (!(digit_h & 1))
	  nzeros +=
	    3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			  (digit_h & 7));
      }

      if (nzeros) {
	// get P*(2^M[extra_digits])/10^extra_digits
	__mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);

	//now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
	amount = recip_scale[nzeros];
	__shr_128 (CQ, Qh, amount);
      }
      diff_expon += nzeros;

    }
  }
  get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
  (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
  BID_RETURN (res);
}
#endif

if (diff_expon >= 0) {
#ifdef IEEE_ROUND_NEAREST
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
#ifdef IEEE_ROUND_NEAREST_TIES_AWAY
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
  rmode = rnd_mode;
  if (sign_x ^ sign_y && (unsigned) (rmode - 1) < 2)
    rmode = 3 - rmode;
  switch (rmode) {
  case ROUNDING_TO_NEAREST:	// round to nearest code
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_TIES_AWAY:
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_DOWN:
  case ROUNDING_TO_ZERO:
    break;
  default:	// rounding up
    CQ.w[0]++;
    if (!CQ.w[0])
      CQ.w[1]++;
    break;
  }
#endif
#endif

} else {
#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#endif

  handle_UF_128_rem (&res, sign_x ^ sign_y, diff_expon, CQ,
		     CA4.w[1] | CA4.w[0], &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
  (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
  BID_RETURN (res);

}

get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
BID_RETURN (res);
}


//#define LEAVE_TRAILING_ZEROS

TYPE0_FUNCTION_ARGTYPE1_ARGTYPE2 (UINT128, bid128dd_div, UINT64, x,
				  UINT64, y)

     UINT256 CA4, CA4r, P256;
     UINT128 CX, CY, T128, CQ, CR, CA, TP128, Qh, res;
     UINT64 sign_x, sign_y, T, carry64, D, Q_high, Q_low, QX, PD,
       valid_y;
     int_float fx, fy, f64;
     UINT32 QX32, tdigit[3], digit, digit_h, digit_low;
     int exponent_x, exponent_y, bin_index, bin_expon, diff_expon, ed2,
       digits_q, amount;
     int nzeros, i, j, k, d5;
     unsigned rmode;
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
     fexcept_t binaryflags = 0;
#endif

valid_y = unpack_BID64 (&sign_y, &exponent_y, &CY.w[0], y);

	// unpack arguments, check for NaN or Infinity
CX.w[1] = 0;
if (!unpack_BID64 (&sign_x, &exponent_x, &CX.w[0], (x))) {
#ifdef SET_STATUS_FLAGS
if ((y & SNAN_MASK64) == SNAN_MASK64)	// y is sNaN
  __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif

    // test if x is NaN
if ((x & NAN_MASK64) == NAN_MASK64) {
#ifdef SET_STATUS_FLAGS
  if ((x & SNAN_MASK64) == SNAN_MASK64)	// sNaN
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[0] = (CX.w[0] & 0x0003ffffffffffffull);
  __mul_64x64_to_128 (res, res.w[0], power10_table_128[18].w[0]);
  res.w[1] |= ((CX.w[0]) & 0xfc00000000000000ull);
  BID_RETURN (res);
}
	   // x is Infinity?
if (((x) & 0x7800000000000000ull) == 0x7800000000000000ull) {
  // check if y is Inf.
  if ((((y) & 0x7c00000000000000ull) == 0x7800000000000000ull))
    // return NaN 
  {
#ifdef SET_STATUS_FLAGS
  __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[1] = 0x7c00000000000000ull;
  res.w[0] = 0;
    BID_RETURN (res);
  }
  if ((((y) & 0x7c00000000000000ull) != 0x7c00000000000000ull)) {
  // otherwise return +/-Inf
  res.w[1] =
    (((x) ^ (y)) & 0x8000000000000000ull) | 0x7800000000000000ull;
  res.w[0] = 0;
  BID_RETURN (res);
  }
}
	   // x is 0
if ((((y) & 0x7800000000000000ull) != 0x7800000000000000ull)) {
    if(!CY.w[0]) {
#ifdef SET_STATUS_FLAGS
  __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  // x=y=0, return NaN
  res.w[1] = 0x7c00000000000000ull;
  res.w[0] = 0;
  BID_RETURN (res);
}
	   // return 0
res.w[1] = ((x) ^ (y)) & 0x8000000000000000ull;
if (((y) & 0x6000000000000000ull) == 0x6000000000000000ull)
  exponent_y = ((UINT32) ((y) >> 51)) & 0x3ff;
else
  exponent_y = ((UINT32) ((y) >> 53)) & 0x3ff;
exponent_x = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS_128;
if (exponent_x > DECIMAL_MAX_EXPON_128)
  exponent_x = DECIMAL_MAX_EXPON_128;
else if (exponent_x < 0)
  exponent_x = 0;
res.w[1] |= (((UINT64) exponent_x) << 49);
res.w[0] = 0;
BID_RETURN (res);
}
}

CY.w[1] = 0;
if (!valid_y) {
  // y is Inf. or NaN

  // test if y is NaN
  if ((y & NAN_MASK64) == NAN_MASK64) {
#ifdef SET_STATUS_FLAGS
    if ((y & SNAN_MASK64) == SNAN_MASK64)	// sNaN
      __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[0] = (CY.w[0] & 0x0003ffffffffffffull);
  __mul_64x64_to_128 (res, res.w[0], power10_table_128[18].w[0]);
  res.w[1] |= ((CY.w[0]) & 0xfc00000000000000ull);
    BID_RETURN (res);
  }
  // y is Infinity?
  if (((y) & 0x7800000000000000ull) == 0x7800000000000000ull) {
    // return +/-0
    res.w[1] = sign_x ^ sign_y;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // y is 0, return +/-Inf
  res.w[1] =
    (((x) ^ (y)) & 0x8000000000000000ull) | 0x7800000000000000ull;
  res.w[0] = 0;
#ifdef SET_STATUS_FLAGS
  __set_status_flags (pfpsf, ZERO_DIVIDE_EXCEPTION);
#endif
  BID_RETURN (res);
}
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fegetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
diff_expon = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS_128;

if (__unsigned_compare_gt_128 (CY, CX)) {
  // CX < CY

  // 2^64
  f64.i = 0x5f800000;

  // fx ~ CX,   fy ~ CY
  fx.d = (float) CX.w[1] * f64.d + (float) CX.w[0];
  fy.d = (float) CY.w[1] * f64.d + (float) CY.w[0];
  // expon_cy - expon_cx
  bin_index = (fy.i - fx.i) >> 23;

  if (CX.w[1]) {
    T = power10_index_binexp_128[bin_index].w[0];
    __mul_64x128_short (CA, T, CX);
  } else {
    T128 = power10_index_binexp_128[bin_index];
    __mul_64x128_short (CA, CX.w[0], T128);
  }

  ed2 = 33;
  if (__unsigned_compare_gt_128 (CY, CA))
    ed2++;

  T128 = power10_table_128[ed2];
  __mul_128x128_to_256 (CA4, CA, T128);

  ed2 += estimate_decimal_digits[bin_index];
  CQ.w[0] = CQ.w[1] = 0;
  diff_expon = diff_expon - ed2;

} else {
  // get CQ = CX/CY
  __div_128_by_128 (&CQ, &CR, CX, CY);

  if (!CR.w[1] && !CR.w[0]) {
    get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,
		pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
  // get number of decimal digits in CQ
  // 2^64
  f64.i = 0x5f800000;
  fx.d = (float) CQ.w[1] * f64.d + (float) CQ.w[0];
  // binary expon. of CQ
  bin_expon = (fx.i - 0x3f800000) >> 23;

  digits_q = estimate_decimal_digits[bin_expon];
  TP128.w[0] = power10_index_binexp_128[bin_expon].w[0];
  TP128.w[1] = power10_index_binexp_128[bin_expon].w[1];
  if (__unsigned_compare_ge_128 (CQ, TP128))
    digits_q++;

  ed2 = 34 - digits_q;
  T128.w[0] = power10_table_128[ed2].w[0];
  T128.w[1] = power10_table_128[ed2].w[1];
  __mul_128x128_to_256 (CA4, CR, T128);
  diff_expon = diff_expon - ed2;
  __mul_128x128_low (CQ, CQ, T128);

}

__div_256_by_128 (&CQ, &CA4, CY);


#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#ifndef LEAVE_TRAILING_ZEROS
  else
#endif
#else
#ifndef LEAVE_TRAILING_ZEROS
  if (!CA4.w[0] && !CA4.w[1])
#endif
#endif
#ifndef LEAVE_TRAILING_ZEROS
    // check whether result is exact
  {
    // check whether CX, CY are short
    if (!CX.w[1] && !CY.w[1] && (CX.w[0] <= 1024) && (CY.w[0] <= 1024)) {
      i = (int) CY.w[0] - 1;
      j = (int) CX.w[0] - 1;
      // difference in powers of 2 factors for Y and X
      nzeros = ed2 - factors[i][0] + factors[j][0];
      // difference in powers of 5 factors
      d5 = ed2 - factors[i][1] + factors[j][1];
      if (d5 < nzeros)
	nzeros = d5;
      // get P*(2^M[extra_digits])/10^extra_digits
      __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);
      //__mul_128x128_to_256(P256, CQ, reciprocals10_128[nzeros]);Qh.w[1]=P256.w[3];Qh.w[0]=P256.w[2];

      // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
      amount = recip_scale[nzeros];
      __shr_128_long (CQ, Qh, amount);

      diff_expon += nzeros;
    } else {
      // decompose Q as Qh*10^17 + Ql
      //T128 = reciprocals10_128[17];
      T128.w[0] = 0x44909befeb9fad49ull;
      T128.w[1] = 0x000b877aa3236a4bull;
      __mul_128x128_to_256 (P256, CQ, T128);
      //amount = recip_scale[17];
      Q_high = (P256.w[2] >> 44) | (P256.w[3] << (64 - 44));
      Q_low = CQ.w[0] - Q_high * 100000000000000000ull;

      if (!Q_low) {
	diff_expon += 17;

	tdigit[0] = Q_high & 0x3ffffff;
	tdigit[1] = 0;
	QX = Q_high >> 26;
	QX32 = QX;
	nzeros = 0;

	for (j = 0; QX32; j++, QX32 >>= 7) {
	  k = (QX32 & 127);
	  tdigit[0] += convert_table[j][k][0];
	  tdigit[1] += convert_table[j][k][1];
	  if (tdigit[0] >= 100000000) {
	    tdigit[0] -= 100000000;
	    tdigit[1]++;
	  }
	}


	if (tdigit[1] >= 100000000) {
	  tdigit[1] -= 100000000;
	  if (tdigit[1] >= 100000000)
	    tdigit[1] -= 100000000;
	}

	digit = tdigit[0];
	if (!digit && !tdigit[1])
	  nzeros += 16;
	else {
	  if (!digit) {
	    nzeros += 8;
	    digit = tdigit[1];
	  }
	  // decompose digit
	  PD = (UINT64) digit *0x068DB8BBull;
	  digit_h = (UINT32) (PD >> 40);
	  digit_low = digit - digit_h * 10000;

	  if (!digit_low)
	    nzeros += 4;
	  else
	    digit_h = digit_low;

	  if (!(digit_h & 1))
	    nzeros +=
	      3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			    (digit_h & 7));
	}

	if (nzeros) {
	  __mul_64x64_to_128 (CQ, Q_high, reciprocals10_64[nzeros]);

	  // now get P/10^extra_digits: shift C64 right by M[extra_digits]-64
	  amount = short_recip_scale[nzeros];
	  CQ.w[0] = CQ.w[1] >> amount;
	} else
	  CQ.w[0] = Q_high;
	CQ.w[1] = 0;

	diff_expon += nzeros;
      } else {
	tdigit[0] = Q_low & 0x3ffffff;
	tdigit[1] = 0;
	QX = Q_low >> 26;
	QX32 = QX;
	nzeros = 0;

	for (j = 0; QX32; j++, QX32 >>= 7) {
	  k = (QX32 & 127);
	  tdigit[0] += convert_table[j][k][0];
	  tdigit[1] += convert_table[j][k][1];
	  if (tdigit[0] >= 100000000) {
	    tdigit[0] -= 100000000;
	    tdigit[1]++;
	  }
	}

	if (tdigit[1] >= 100000000) {
	  tdigit[1] -= 100000000;
	  if (tdigit[1] >= 100000000)
	    tdigit[1] -= 100000000;
	}

	digit = tdigit[0];
	if (!digit && !tdigit[1])
	  nzeros += 16;
	else {
	  if (!digit) {
	    nzeros += 8;
	    digit = tdigit[1];
	  }
	  // decompose digit
	  PD = (UINT64) digit *0x068DB8BBull;
	  digit_h = (UINT32) (PD >> 40);
	  digit_low = digit - digit_h * 10000;

	  if (!digit_low)
	    nzeros += 4;
	  else
	    digit_h = digit_low;

	  if (!(digit_h & 1))
	    nzeros +=
	      3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			    (digit_h & 7));
	}

	if (nzeros) {
	  // get P*(2^M[extra_digits])/10^extra_digits
	  __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);

	  // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
	  amount = recip_scale[nzeros];
	  __shr_128 (CQ, Qh, amount);
	}
	diff_expon += nzeros;

      }
    }
    get_BID128(&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
#endif

if (diff_expon >= 0) {
#ifdef IEEE_ROUND_NEAREST
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
#ifdef IEEE_ROUND_NEAREST_TIES_AWAY
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
  rmode = rnd_mode;
  if (sign_x ^ sign_y && (unsigned) (rmode - 1) < 2)
    rmode = 3 - rmode;
  switch (rmode) {
  case ROUNDING_TO_NEAREST:	// round to nearest code
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_TIES_AWAY:
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_DOWN:
  case ROUNDING_TO_ZERO:
    break;
  default:	// rounding up
    CQ.w[0]++;
    if (!CQ.w[0])
      CQ.w[1]++;
    break;
  }
#endif
#endif

} else {
#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#endif
  handle_UF_128_rem (&res, sign_x ^ sign_y, diff_expon, CQ,
		     CA4.w[1] | CA4.w[0], &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
  (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
  BID_RETURN (res);

}

get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
BID_RETURN (res);
}


BID128_FUNCTION_ARGTYPE1_ARG128 (bid128dq_div, UINT64, x, y)
     UINT256 CA4, CA4r, P256;
     UINT128 CX, CY, T128, CQ, CR, CA, TP128, Qh, res;
     UINT64 sign_x, sign_y, T, carry64, D, Q_high, Q_low, QX, valid_y,
       PD;
     int_float fx, fy, f64;
     UINT32 QX32, tdigit[3], digit, digit_h, digit_low;
     int exponent_x, exponent_y, bin_index, bin_expon, diff_expon, ed2,
       digits_q, amount;
     int nzeros, i, j, k, d5;
     unsigned rmode;
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
     fexcept_t binaryflags = 0;
#endif

valid_y = unpack_BID128_value (&sign_y, &exponent_y, &CY, y);

	// unpack arguments, check for NaN or Infinity
CX.w[1] = 0;
if (!unpack_BID64 (&sign_x, &exponent_x, &CX.w[0], x)) {
#ifdef SET_STATUS_FLAGS
if ((y.w[1] & SNAN_MASK64) == SNAN_MASK64)	// y is sNaN
  __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif

    // test if x is NaN
if ((x & NAN_MASK64) == NAN_MASK64) {
#ifdef SET_STATUS_FLAGS
  if ((x & SNAN_MASK64) == SNAN_MASK64)	// sNaN
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[0] = (CX.w[0] & 0x0003ffffffffffffull);
  __mul_64x64_to_128 (res, res.w[0], power10_table_128[18].w[0]);
  res.w[1] |= ((CX.w[0]) & 0xfc00000000000000ull);
  BID_RETURN (res);
}
	   // x is Infinity?
if ((x & 0x7800000000000000ull) == 0x7800000000000000ull) {
  // check if y is Inf.
  if (((y.w[1] & 0x7c00000000000000ull) == 0x7800000000000000ull))
    // return NaN 
  {
#ifdef SET_STATUS_FLAGS
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    res.w[1] = 0x7c00000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  if (((y.w[1] & 0x7c00000000000000ull) != 0x7c00000000000000ull)) {
  // otherwise return +/-Inf
  res.w[1] =
    ((x ^ y.w[1]) & 0x8000000000000000ull) | 0x7800000000000000ull;
  res.w[0] = 0;
  BID_RETURN (res);
  }
}
	   // x is 0
if ((y.w[1] & INFINITY_MASK64) != INFINITY_MASK64) {
  if ((!CY.w[0]) && !(CY.w[1] & 0x0001ffffffffffffull)) {
#ifdef SET_STATUS_FLAGS
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    // x=y=0, return NaN
    res.w[1] = 0x7c00000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // return 0
  res.w[1] = (x ^ y.w[1]) & 0x8000000000000000ull;
  exponent_x = exponent_x - exponent_y + (DECIMAL_EXPONENT_BIAS_128<<1) - DECIMAL_EXPONENT_BIAS;
  if (exponent_x > DECIMAL_MAX_EXPON_128)
    exponent_x = DECIMAL_MAX_EXPON_128;
  else if (exponent_x < 0)
    exponent_x = 0;
  res.w[1] |= (((UINT64) exponent_x) << 49);
  res.w[0] = 0;
  BID_RETURN (res);
}
}
exponent_x += (DECIMAL_EXPONENT_BIAS_128 - DECIMAL_EXPONENT_BIAS);

if (!valid_y) {
  // y is Inf. or NaN

  // test if y is NaN
  if ((y.w[1] & 0x7c00000000000000ull) == 0x7c00000000000000ull) {
#ifdef SET_STATUS_FLAGS
    if ((y.w[1] & 0x7e00000000000000ull) == 0x7e00000000000000ull)	// sNaN
      __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    res.w[1] = CY.w[1] & QUIET_MASK64;
    res.w[0] = CY.w[0];
    BID_RETURN (res);
  }
  // y is Infinity?
  if ((y.w[1] & 0x7800000000000000ull) == 0x7800000000000000ull) {
    // return +/-0
    res.w[1] = sign_x ^ sign_y;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // y is 0, return +/-Inf
  res.w[1] =
    ((x ^ y.w[1]) & 0x8000000000000000ull) | 0x7800000000000000ull;
  res.w[0] = 0;
#ifdef SET_STATUS_FLAGS
  __set_status_flags (pfpsf, ZERO_DIVIDE_EXCEPTION);
#endif
  BID_RETURN (res);
}
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fegetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
diff_expon = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS_128;

if (__unsigned_compare_gt_128 (CY, CX)) {
  // CX < CY

  // 2^64
  f64.i = 0x5f800000;

  // fx ~ CX,   fy ~ CY
  fx.d = (float) CX.w[1] * f64.d + (float) CX.w[0];
  fy.d = (float) CY.w[1] * f64.d + (float) CY.w[0];
  // expon_cy - expon_cx
  bin_index = (fy.i - fx.i) >> 23;

  if (CX.w[1]) {
    T = power10_index_binexp_128[bin_index].w[0];
    __mul_64x128_short (CA, T, CX);
  } else {
    T128 = power10_index_binexp_128[bin_index];
    __mul_64x128_short (CA, CX.w[0], T128);
  }

  ed2 = 33;
  if (__unsigned_compare_gt_128 (CY, CA))
    ed2++;

  T128 = power10_table_128[ed2];
  __mul_128x128_to_256 (CA4, CA, T128);

  ed2 += estimate_decimal_digits[bin_index];
  CQ.w[0] = CQ.w[1] = 0;
  diff_expon = diff_expon - ed2;

} else {
  // get CQ = CX/CY
  __div_128_by_128 (&CQ, &CR, CX, CY);

  if (!CR.w[1] && !CR.w[0]) {
    get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,
		pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
  // get number of decimal digits in CQ
  // 2^64
  f64.i = 0x5f800000;
  fx.d = (float) CQ.w[1] * f64.d + (float) CQ.w[0];
  // binary expon. of CQ
  bin_expon = (fx.i - 0x3f800000) >> 23;

  digits_q = estimate_decimal_digits[bin_expon];
  TP128.w[0] = power10_index_binexp_128[bin_expon].w[0];
  TP128.w[1] = power10_index_binexp_128[bin_expon].w[1];
  if (__unsigned_compare_ge_128 (CQ, TP128))
    digits_q++;

  ed2 = 34 - digits_q;
  T128.w[0] = power10_table_128[ed2].w[0];
  T128.w[1] = power10_table_128[ed2].w[1];
  __mul_128x128_to_256 (CA4, CR, T128);
  diff_expon = diff_expon - ed2;
  __mul_128x128_low (CQ, CQ, T128);

}

__div_256_by_128 (&CQ, &CA4, CY);

#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#ifndef LEAVE_TRAILING_ZEROS
  else
#endif
#else
#ifndef LEAVE_TRAILING_ZEROS
  if (!CA4.w[0] && !CA4.w[1])
#endif
#endif
#ifndef LEAVE_TRAILING_ZEROS
    // check whether result is exact
  {
    //printf("ed2=%d,nz=%d,a=%d,CQ="LX16","LX16", RH="LX16", RL="LX16"\n",ed2,nzeros,amount,CQ.w[1],CQ.w[0],reciprocals10_128[nzeros].w[1],reciprocals10_128[nzeros].w[0]);fflush(stdout);
    // check whether CX, CY are short
    if (!CX.w[1] && !CY.w[1] && (CX.w[0] <= 1024) && (CY.w[0] <= 1024)) {
      i = (int) CY.w[0] - 1;
      j = (int) CX.w[0] - 1;
      // difference in powers of 2 factors for Y and X
      nzeros = ed2 - factors[i][0] + factors[j][0];
      // difference in powers of 5 factors
      d5 = ed2 - factors[i][1] + factors[j][1];
      if (d5 < nzeros)
	nzeros = d5;
      // get P*(2^M[extra_digits])/10^extra_digits
      __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);
      //__mul_128x128_to_256(P256, CQ, reciprocals10_128[nzeros]);Qh.w[1]=P256.w[3];Qh.w[0]=P256.w[2];

      // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
      amount = recip_scale[nzeros];
      __shr_128_long (CQ, Qh, amount);

      diff_expon += nzeros;
    } else {
      // decompose Q as Qh*10^17 + Ql
      //T128 = reciprocals10_128[17];
      T128.w[0] = 0x44909befeb9fad49ull;
      T128.w[1] = 0x000b877aa3236a4bull;
      __mul_128x128_to_256 (P256, CQ, T128);
      //amount = recip_scale[17];
      Q_high = (P256.w[2] >> 44) | (P256.w[3] << (64 - 44));
      Q_low = CQ.w[0] - Q_high * 100000000000000000ull;

      if (!Q_low) {
	diff_expon += 17;

	tdigit[0] = Q_high & 0x3ffffff;
	tdigit[1] = 0;
	QX = Q_high >> 26;
	QX32 = QX;
	nzeros = 0;

	for (j = 0; QX32; j++, QX32 >>= 7) {
	  k = (QX32 & 127);
	  tdigit[0] += convert_table[j][k][0];
	  tdigit[1] += convert_table[j][k][1];
	  if (tdigit[0] >= 100000000) {
	    tdigit[0] -= 100000000;
	    tdigit[1]++;
	  }
	}


	if (tdigit[1] >= 100000000) {
	  tdigit[1] -= 100000000;
	  if (tdigit[1] >= 100000000)
	    tdigit[1] -= 100000000;
	}

	digit = tdigit[0];
	if (!digit && !tdigit[1])
	  nzeros += 16;
	else {
	  if (!digit) {
	    nzeros += 8;
	    digit = tdigit[1];
	  }
	  // decompose digit
	  PD = (UINT64) digit *0x068DB8BBull;
	  digit_h = (UINT32) (PD >> 40);
	  //printf("i=%d, nz=%d, digit=%d (%d, %016I64x %016I64x)\n",i,nzeros,digit_h,digit,PD,digit_h);fflush(stdout);
	  digit_low = digit - digit_h * 10000;

	  if (!digit_low)
	    nzeros += 4;
	  else
	    digit_h = digit_low;

	  if (!(digit_h & 1))
	    nzeros +=
	      3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			    (digit_h & 7));
	}

	if (nzeros) {
	  __mul_64x64_to_128 (CQ, Q_high, reciprocals10_64[nzeros]);

	  // now get P/10^extra_digits: shift C64 right by M[extra_digits]-64
	  amount = short_recip_scale[nzeros];
	  CQ.w[0] = CQ.w[1] >> amount;
	} else
	  CQ.w[0] = Q_high;
	CQ.w[1] = 0;

	diff_expon += nzeros;
      } else {
	tdigit[0] = Q_low & 0x3ffffff;
	tdigit[1] = 0;
	QX = Q_low >> 26;
	QX32 = QX;
	nzeros = 0;

	for (j = 0; QX32; j++, QX32 >>= 7) {
	  k = (QX32 & 127);
	  tdigit[0] += convert_table[j][k][0];
	  tdigit[1] += convert_table[j][k][1];
	  if (tdigit[0] >= 100000000) {
	    tdigit[0] -= 100000000;
	    tdigit[1]++;
	  }
	}

	if (tdigit[1] >= 100000000) {
	  tdigit[1] -= 100000000;
	  if (tdigit[1] >= 100000000)
	    tdigit[1] -= 100000000;
	}

	digit = tdigit[0];
	if (!digit && !tdigit[1])
	  nzeros += 16;
	else {
	  if (!digit) {
	    nzeros += 8;
	    digit = tdigit[1];
	  }
	  // decompose digit
	  PD = (UINT64) digit *0x068DB8BBull;
	  digit_h = (UINT32) (PD >> 40);
	  //printf("i=%d, nz=%d, digit=%d (%d, %016I64x %016I64x)\n",i,nzeros,digit_h,digit,PD,digit_h);fflush(stdout);
	  digit_low = digit - digit_h * 10000;

	  if (!digit_low)
	    nzeros += 4;
	  else
	    digit_h = digit_low;

	  if (!(digit_h & 1))
	    nzeros +=
	      3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			    (digit_h & 7));
	}

	if (nzeros) {
	  // get P*(2^M[extra_digits])/10^extra_digits
	  __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);

	  // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
	  amount = recip_scale[nzeros];
	  __shr_128 (CQ, Qh, amount);
	}
	diff_expon += nzeros;

      }
    }
    get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,
		pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
#endif

if (diff_expon >= 0) {
#ifdef IEEE_ROUND_NEAREST
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
#ifdef IEEE_ROUND_NEAREST_TIES_AWAY
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
  rmode = rnd_mode;
  if (sign_x ^ sign_y && (unsigned) (rmode - 1) < 2)
    rmode = 3 - rmode;
  switch (rmode) {
  case ROUNDING_TO_NEAREST:	// round to nearest code
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_TIES_AWAY:
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_DOWN:
  case ROUNDING_TO_ZERO:
    break;
  default:	// rounding up
    CQ.w[0]++;
    if (!CQ.w[0])
      CQ.w[1]++;
    break;
  }
#endif
#endif

} else {
#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#endif
  handle_UF_128_rem (&res, sign_x ^ sign_y, diff_expon, CQ,
		     CA4.w[1] | CA4.w[0], &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
  (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
  BID_RETURN (res);
}

get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
BID_RETURN (res);

}


BID128_FUNCTION_ARG128_ARGTYPE2 (bid128qd_div, x, UINT64, y)
     UINT256 CA4, CA4r, P256;
     UINT128 CX, CY, T128, CQ, CR, CA, TP128, Qh, res;
     UINT64 sign_x, sign_y, T, carry64, D, Q_high, Q_low, QX, PD,
       valid_y;
     int_float fx, fy, f64;
     UINT32 QX32, tdigit[3], digit, digit_h, digit_low;
     int exponent_x, exponent_y, bin_index, bin_expon, diff_expon, ed2,
       digits_q, amount;
     int nzeros, i, j, k, d5, rmode;
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
     fexcept_t binaryflags = 0;
#endif


valid_y = unpack_BID64 (&sign_y, &exponent_y, &CY.w[0], y);
	// unpack arguments, check for NaN or Infinity
if (!unpack_BID128_value (&sign_x, &exponent_x, &CX, x)) {
    // test if x is NaN
if ((x.w[1] & 0x7c00000000000000ull) == 0x7c00000000000000ull) {
#ifdef SET_STATUS_FLAGS
  if ((x.w[1] & 0x7e00000000000000ull) == 0x7e00000000000000ull ||	// sNaN
      (y & 0x7e00000000000000ull) == 0x7e00000000000000ull)
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[1] = (CX.w[1]) & QUIET_MASK64;
  res.w[0] = CX.w[0];
  BID_RETURN (res);
}
    // x is Infinity?
if ((x.w[1] & 0x7800000000000000ull) == 0x7800000000000000ull) {
  // check if y is Inf. 
  if (((y & 0x7c00000000000000ull) == 0x7800000000000000ull))
    // return NaN 
  {
#ifdef SET_STATUS_FLAGS
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    res.w[1] = 0x7c00000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // y is NaN?
  if (((y & 0x7c00000000000000ull) != 0x7c00000000000000ull))
    // return NaN 
  {
    // return +/-Inf
    res.w[1] = ((x.w[1] ^ y) & 0x8000000000000000ull) |
      0x7800000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
}
    // x is 0
if ((y & 0x7800000000000000ull) < 0x7800000000000000ull) {
	if (!CY.w[0]) {
#ifdef SET_STATUS_FLAGS
    __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
    // x=y=0, return NaN
    res.w[1] = 0x7c00000000000000ull;
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // return 0
  res.w[1] = (x.w[1] ^ y) & 0x8000000000000000ull;
  exponent_x = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS;
  if (exponent_x > DECIMAL_MAX_EXPON_128)
    exponent_x = DECIMAL_MAX_EXPON_128;
  else if (exponent_x < 0)
    exponent_x = 0;
  res.w[1] |= (((UINT64) exponent_x) << 49);
  res.w[0] = 0;
  BID_RETURN (res);
}
}
CY.w[1] = 0;
if (!valid_y) {
  // y is Inf. or NaN

  // test if y is NaN
  if ((y & NAN_MASK64) == NAN_MASK64) {
#ifdef SET_STATUS_FLAGS
    if ((y & SNAN_MASK64) == SNAN_MASK64)	// sNaN
      __set_status_flags (pfpsf, INVALID_EXCEPTION);
#endif
  res.w[0] = (CY.w[0] & 0x0003ffffffffffffull);
  __mul_64x64_to_128 (res, res.w[0], power10_table_128[18].w[0]);
  res.w[1] |= ((CY.w[0]) & 0xfc00000000000000ull);
    BID_RETURN (res);
  }
  // y is Infinity?
  if ((y & INFINITY_MASK64) == INFINITY_MASK64) {
    // return +/-0
    res.w[1] = ((x.w[1] ^ y) & 0x8000000000000000ull);
    res.w[0] = 0;
    BID_RETURN (res);
  }
  // y is 0
#ifdef SET_STATUS_FLAGS
  __set_status_flags (pfpsf, ZERO_DIVIDE_EXCEPTION);
#endif
  res.w[1] = (sign_x ^ sign_y) | INFINITY_MASK64;
  res.w[0] = 0;
  BID_RETURN (res);
}
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fegetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
diff_expon = exponent_x - exponent_y + DECIMAL_EXPONENT_BIAS;

if (__unsigned_compare_gt_128 (CY, CX)) {
  // CX < CY

  // 2^64
  f64.i = 0x5f800000;

  // fx ~ CX,   fy ~ CY
  fx.d = (float) CX.w[1] * f64.d + (float) CX.w[0];
  fy.d = (float) CY.w[1] * f64.d + (float) CY.w[0];
  // expon_cy - expon_cx
  bin_index = (fy.i - fx.i) >> 23;

  if (CX.w[1]) {
    T = power10_index_binexp_128[bin_index].w[0];
    __mul_64x128_short (CA, T, CX);
  } else {
    T128 = power10_index_binexp_128[bin_index];
    __mul_64x128_short (CA, CX.w[0], T128);
  }

  ed2 = 33;
  if (__unsigned_compare_gt_128 (CY, CA))
    ed2++;

  T128 = power10_table_128[ed2];
  __mul_128x128_to_256 (CA4, CA, T128);

  ed2 += estimate_decimal_digits[bin_index];
  CQ.w[0] = CQ.w[1] = 0;
  diff_expon = diff_expon - ed2;

} else {
  // get CQ = CX/CY
  __div_128_by_128 (&CQ, &CR, CX, CY);

  if (!CR.w[1] && !CR.w[0]) {
    get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,
		pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
  // get number of decimal digits in CQ
  // 2^64
  f64.i = 0x5f800000;
  fx.d = (float) CQ.w[1] * f64.d + (float) CQ.w[0];
  // binary expon. of CQ
  bin_expon = (fx.i - 0x3f800000) >> 23;

  digits_q = estimate_decimal_digits[bin_expon];
  TP128.w[0] = power10_index_binexp_128[bin_expon].w[0];
  TP128.w[1] = power10_index_binexp_128[bin_expon].w[1];
  if (__unsigned_compare_ge_128 (CQ, TP128))
    digits_q++;

  ed2 = 34 - digits_q;
  T128.w[0] = power10_table_128[ed2].w[0];
  T128.w[1] = power10_table_128[ed2].w[1];
  __mul_128x128_to_256 (CA4, CR, T128);
  diff_expon = diff_expon - ed2;
  __mul_128x128_low (CQ, CQ, T128);

}

__div_256_by_128 (&CQ, &CA4, CY);


#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#ifndef LEAVE_TRAILING_ZEROS
  else
#endif
#else
#ifndef LEAVE_TRAILING_ZEROS
  if (!CA4.w[0] && !CA4.w[1])
#endif
#endif
#ifndef LEAVE_TRAILING_ZEROS
    // check whether result is exact
  {
    // check whether CX, CY are short
    if (!CX.w[1] && !CY.w[1] && (CX.w[0] <= 1024) && (CY.w[0] <= 1024)) {
      i = (int) CY.w[0] - 1;
      j = (int) CX.w[0] - 1;
      // difference in powers of 2 factors for Y and X
      nzeros = ed2 - factors[i][0] + factors[j][0];
      // difference in powers of 5 factors
      d5 = ed2 - factors[i][1] + factors[j][1];
      if (d5 < nzeros)
	nzeros = d5;
      // get P*(2^M[extra_digits])/10^extra_digits
      __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);
      //__mul_128x128_to_256(P256, CQ, reciprocals10_128[nzeros]);Qh.w[1]=P256.w[3];Qh.w[0]=P256.w[2];

      // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
      amount = recip_scale[nzeros];
      __shr_128_long (CQ, Qh, amount);

      diff_expon += nzeros;
    } else {
      // decompose Q as Qh*10^17 + Ql
      //T128 = reciprocals10_128[17];
      T128.w[0] = 0x44909befeb9fad49ull;
      T128.w[1] = 0x000b877aa3236a4bull;
      __mul_128x128_to_256 (P256, CQ, T128);
      //amount = recip_scale[17];
      Q_high = (P256.w[2] >> 44) | (P256.w[3] << (64 - 44));
      Q_low = CQ.w[0] - Q_high * 100000000000000000ull;

      if (!Q_low) {
	diff_expon += 17;

	tdigit[0] = Q_high & 0x3ffffff;
	tdigit[1] = 0;
	QX = Q_high >> 26;
	QX32 = QX;
	nzeros = 0;

	for (j = 0; QX32; j++, QX32 >>= 7) {
	  k = (QX32 & 127);
	  tdigit[0] += convert_table[j][k][0];
	  tdigit[1] += convert_table[j][k][1];
	  if (tdigit[0] >= 100000000) {
	    tdigit[0] -= 100000000;
	    tdigit[1]++;
	  }
	}


	if (tdigit[1] >= 100000000) {
	  tdigit[1] -= 100000000;
	  if (tdigit[1] >= 100000000)
	    tdigit[1] -= 100000000;
	}

	digit = tdigit[0];
	if (!digit && !tdigit[1])
	  nzeros += 16;
	else {
	  if (!digit) {
	    nzeros += 8;
	    digit = tdigit[1];
	  }
	  // decompose digit
	  PD = (UINT64) digit *0x068DB8BBull;
	  digit_h = (UINT32) (PD >> 40);
	  digit_low = digit - digit_h * 10000;

	  if (!digit_low)
	    nzeros += 4;
	  else
	    digit_h = digit_low;

	  if (!(digit_h & 1))
	    nzeros +=
	      3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			    (digit_h & 7));
	}

	if (nzeros) {
	  __mul_64x64_to_128 (CQ, Q_high, reciprocals10_64[nzeros]);

	  // now get P/10^extra_digits: shift C64 right by M[extra_digits]-64
	  amount = short_recip_scale[nzeros];
	  CQ.w[0] = CQ.w[1] >> amount;
	} else
	  CQ.w[0] = Q_high;
	CQ.w[1] = 0;

	diff_expon += nzeros;
      } else {
	tdigit[0] = Q_low & 0x3ffffff;
	tdigit[1] = 0;
	QX = Q_low >> 26;
	QX32 = QX;
	nzeros = 0;

	for (j = 0; QX32; j++, QX32 >>= 7) {
	  k = (QX32 & 127);
	  tdigit[0] += convert_table[j][k][0];
	  tdigit[1] += convert_table[j][k][1];
	  if (tdigit[0] >= 100000000) {
	    tdigit[0] -= 100000000;
	    tdigit[1]++;
	  }
	}

	if (tdigit[1] >= 100000000) {
	  tdigit[1] -= 100000000;
	  if (tdigit[1] >= 100000000)
	    tdigit[1] -= 100000000;
	}

	digit = tdigit[0];
	if (!digit && !tdigit[1])
	  nzeros += 16;
	else {
	  if (!digit) {
	    nzeros += 8;
	    digit = tdigit[1];
	  }
	  // decompose digit
	  PD = (UINT64) digit *0x068DB8BBull;
	  digit_h = (UINT32) (PD >> 40);
	  digit_low = digit - digit_h * 10000;

	  if (!digit_low)
	    nzeros += 4;
	  else
	    digit_h = digit_low;

	  if (!(digit_h & 1))
	    nzeros +=
	      3 & (UINT32) (packed_10000_zeros[digit_h >> 3] >>
			    (digit_h & 7));
	}

	if (nzeros) {
	  // get P*(2^M[extra_digits])/10^extra_digits
	  __mul_128x128_high (Qh, CQ, reciprocals10_128[nzeros]);

	  // now get P/10^extra_digits: shift Q_high right by M[extra_digits]-128
	  amount = recip_scale[nzeros];
	  __shr_128 (CQ, Qh, amount);
	}
	diff_expon += nzeros;

      }
    }
    get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode,pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
    (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
    BID_RETURN (res);
  }
#endif

if (diff_expon >= 0) {
#ifdef IEEE_ROUND_NEAREST
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
#ifdef IEEE_ROUND_NEAREST_TIES_AWAY
  // rounding
  // 2*CA4 - CY
  CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
  CA4r.w[0] = CA4.w[0] + CA4.w[0];
  __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
  CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;

  D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
  carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;

  CQ.w[0] += carry64;
  if (CQ.w[0] < carry64)
    CQ.w[1]++;
#else
  rmode = rnd_mode;
  if (sign_x ^ sign_y && (unsigned) (rmode - 1) < 2)
    rmode = 3 - rmode;
  switch (rmode) {
  case ROUNDING_TO_NEAREST:	// round to nearest code
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 1 : 0;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) & ((CQ.w[0]) | D);
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_TIES_AWAY:
    // rounding
    // 2*CA4 - CY
    CA4r.w[1] = (CA4.w[1] + CA4.w[1]) | (CA4.w[0] >> 63);
    CA4r.w[0] = CA4.w[0] + CA4.w[0];
    __sub_borrow_out (CA4r.w[0], carry64, CA4r.w[0], CY.w[0]);
    CA4r.w[1] = CA4r.w[1] - CY.w[1] - carry64;
    D = (CA4r.w[1] | CA4r.w[0]) ? 0 : 1;
    carry64 = (1 + (((SINT64) CA4r.w[1]) >> 63)) | D;
    CQ.w[0] += carry64;
    if (CQ.w[0] < carry64)
      CQ.w[1]++;
    break;
  case ROUNDING_DOWN:
  case ROUNDING_TO_ZERO:
    break;
  default:	// rounding up
    CQ.w[0]++;
    if (!CQ.w[0])
      CQ.w[1]++;
    break;
  }
#endif
#endif

} else {
#ifdef SET_STATUS_FLAGS
  if (CA4.w[0] || CA4.w[1]) {
    // set status flags
    __set_status_flags (pfpsf, INEXACT_EXCEPTION);
  }
#endif
  handle_UF_128_rem (&res, sign_x ^ sign_y, diff_expon, CQ,
		     CA4.w[1] | CA4.w[0], &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
  (void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
  BID_RETURN (res);

}

get_BID128 (&res, sign_x ^ sign_y, diff_expon, CQ, &rnd_mode, pfpsf);
#ifdef UNCHANGED_BINARY_STATUS_FLAGS
(void) fesetexceptflag (&binaryflags, FE_ALL_FLAGS);
#endif
BID_RETURN (res);

}