/*

 * Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

 *

 * Copyright (c) 1999

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1999

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 */

#include "stlport_prefix.h"

#include <limits>

#include <locale>

#include <istream>

#if defined (__GNUC__) && !defined (__sun) || \

    defined (__DMC__)

#  include <stdint.h>

#endif

#if defined (__linux__)

#  include <ieee754.h>

union _ll {

  uint64_t i64;

  struct {

#  if defined (_STLP_BIG_ENDIAN)

    uint32_t hi;

    uint32_t lo;

#  elif defined (_STLP_LITTLE_ENDIAN)

    uint32_t lo;

    uint32_t hi;

#  else

#    error Unknown endianess

#  endif

  } i32;

};

#endif

#if defined (N_PLAT_NLM)

#  include <nlm/nwintxx.h>

#  if defined (INT64)

typedef unsigned INT64 uint64_t;

#  else

// #error "Can't find INT64"

// 64-bit int really not defined in headers

// (_INTEGRAL_MAX_BITS < 64 in any case?), but compiler indeed know __int64

//        - ptr, 2005-05-06

typedef unsigned __int64 uint64_t;

#  endif

#  if defined (INT32)

typedef unsigned INT32 uint32_t;

#  else

#    error Can not find INT32

#  endif

union _ll {

  uint64_t i64;

  struct {

    uint32_t lo;

    uint32_t hi;

  } i32;

};

#endif

_STLP_BEGIN_NAMESPACE

_STLP_MOVE_TO_PRIV_NAMESPACE

//----------------------------------------------------------------------

// num_get

// Helper functions for _M_do_get_float.

#if !defined (_STLP_NO_WCHAR_T)

void  _STLP_DECLSPEC _STLP_CALL

_Initialize_get_float( const ctype<wchar_t>& ct,

                       wchar_t& Plus, wchar_t& Minus,

                       wchar_t& pow_e, wchar_t& pow_E,

                       wchar_t* digits) {

  char ndigits[11] = "0123456789";

  Plus  = ct.widen('+');

  Minus = ct.widen('-');

  pow_e = ct.widen('e');

  pow_E = ct.widen('E');

  ct.widen(ndigits + 0, ndigits + 10, digits);

}

#endif /* WCHAR_T */

/*

 * __string_to_double is just lifted from atof, the difference being

 * that we just use '.' for the decimal point, rather than let it

 * be taken from the current C locale, which of course is not accessible

 * to us.

 */

#if defined (_STLP_MSVC) || defined (__BORLANDC__) || defined (__ICL)

typedef unsigned long uint32;

typedef unsigned __int64 uint64;

#  define ULL(x) x##Ui64

#elif defined (__MRC__) || defined (__SC__)

typedef unsigned long uint32;

#  include "uint64.h"    //*TY 03/25/2000 - added 64bit math type definition

#elif defined (__unix) || defined (__MINGW32__) || defined (N_PLAT_NLM) || \

      (defined (__DMC__) && (__LONGLONG)) || defined(__SYMBIAN32__)

#if defined(__SYMBIAN32__)

#  include <sys/types.h>

#endif

typedef uint32_t uint32;

typedef uint64_t uint64;

#  define ULL(x) x##ULL

#else

#  error There should be some unsigned 64-bit integer on the system!

#endif

// Multiplication of two 64-bit integers, giving a 128-bit result.

// Taken from Algorithm M in Knuth section 4.3.1, with the loop

// hand-unrolled.

static void _Stl_mult64(const uint64 u, const uint64 v,

                        uint64& high, uint64& low) {

  const uint64 low_mask = ULL(0xffffffff);

  const uint64 u0 = u & low_mask;

  const uint64 u1 = u >> 32;

  const uint64 v0 = v & low_mask;

  const uint64 v1 = v >> 32;

  uint64 t = u0 * v0;

  low = t & low_mask;

  t = u1 * v0 + (t >> 32);

  uint64 w1 = t & low_mask;

  uint64 w2 = t >> 32;

  uint64 x = u0 * v1 + w1;

  low += (x & low_mask) << 32;

  high = u1 * v1 + w2 + (x >> 32);

}

#define bit11 ULL(0x7ff)

#define exponent_mask (bit11 << 52)

#if !defined (__GNUC__) || (__GNUC__ != 3) || (__GNUC_MINOR__ != 4) || \

    (!defined (__CYGWIN__) && !defined (__MINGW32__))

//Generate bad code when compiled with -O2 option.

inline

#endif

void _Stl_set_exponent(uint64 &val, uint64 exp)

{ val = (val & ~exponent_mask) | ((exp & bit11) << 52); }

/* Power of ten fractions for tenscale*/

/* The constants are factored so that at most two constants

 * and two multiplies are needed. Furthermore, one of the constants

 * is represented exactly - 10**n where 1<= n <= 27.

 */

#if !defined (__SC__)    //*TY 03/25/2000 - no native 64bit integer under SCpp

static const uint64 _Stl_tenpow[80] = {

ULL(0xa000000000000000), /* _Stl_tenpow[0]=(10**1)/(2**4) */

ULL(0xc800000000000000), /* _Stl_tenpow[1]=(10**2)/(2**7) */

ULL(0xfa00000000000000), /* _Stl_tenpow[2]=(10**3)/(2**10) */

ULL(0x9c40000000000000), /* _Stl_tenpow[3]=(10**4)/(2**14) */

ULL(0xc350000000000000), /* _Stl_tenpow[4]=(10**5)/(2**17) */

ULL(0xf424000000000000), /* _Stl_tenpow[5]=(10**6)/(2**20) */

ULL(0x9896800000000000), /* _Stl_tenpow[6]=(10**7)/(2**24) */

ULL(0xbebc200000000000), /* _Stl_tenpow[7]=(10**8)/(2**27) */

ULL(0xee6b280000000000), /* _Stl_tenpow[8]=(10**9)/(2**30) */

ULL(0x9502f90000000000), /* _Stl_tenpow[9]=(10**10)/(2**34) */

ULL(0xba43b74000000000), /* _Stl_tenpow[10]=(10**11)/(2**37) */

ULL(0xe8d4a51000000000), /* _Stl_tenpow[11]=(10**12)/(2**40) */

ULL(0x9184e72a00000000), /* _Stl_tenpow[12]=(10**13)/(2**44) */

ULL(0xb5e620f480000000), /* _Stl_tenpow[13]=(10**14)/(2**47) */

ULL(0xe35fa931a0000000), /* _Stl_tenpow[14]=(10**15)/(2**50) */

ULL(0x8e1bc9bf04000000), /* _Stl_tenpow[15]=(10**16)/(2**54) */

ULL(0xb1a2bc2ec5000000), /* _Stl_tenpow[16]=(10**17)/(2**57) */

ULL(0xde0b6b3a76400000), /* _Stl_tenpow[17]=(10**18)/(2**60) */

ULL(0x8ac7230489e80000), /* _Stl_tenpow[18]=(10**19)/(2**64) */

ULL(0xad78ebc5ac620000), /* _Stl_tenpow[19]=(10**20)/(2**67) */

ULL(0xd8d726b7177a8000), /* _Stl_tenpow[20]=(10**21)/(2**70) */

ULL(0x878678326eac9000), /* _Stl_tenpow[21]=(10**22)/(2**74) */

ULL(0xa968163f0a57b400), /* _Stl_tenpow[22]=(10**23)/(2**77) */

ULL(0xd3c21bcecceda100), /* _Stl_tenpow[23]=(10**24)/(2**80) */

ULL(0x84595161401484a0), /* _Stl_tenpow[24]=(10**25)/(2**84) */

ULL(0xa56fa5b99019a5c8), /* _Stl_tenpow[25]=(10**26)/(2**87) */

ULL(0xcecb8f27f4200f3a), /* _Stl_tenpow[26]=(10**27)/(2**90) */

ULL(0xd0cf4b50cfe20766), /* _Stl_tenpow[27]=(10**55)/(2**183) */

ULL(0xd2d80db02aabd62c), /* _Stl_tenpow[28]=(10**83)/(2**276) */

ULL(0xd4e5e2cdc1d1ea96), /* _Stl_tenpow[29]=(10**111)/(2**369) */

ULL(0xd6f8d7509292d603), /* _Stl_tenpow[30]=(10**139)/(2**462) */

ULL(0xd910f7ff28069da4), /* _Stl_tenpow[31]=(10**167)/(2**555) */

ULL(0xdb2e51bfe9d0696a), /* _Stl_tenpow[32]=(10**195)/(2**648) */

ULL(0xdd50f1996b947519), /* _Stl_tenpow[33]=(10**223)/(2**741) */

ULL(0xdf78e4b2bd342cf7), /* _Stl_tenpow[34]=(10**251)/(2**834) */

ULL(0xe1a63853bbd26451), /* _Stl_tenpow[35]=(10**279)/(2**927) */

ULL(0xe3d8f9e563a198e5), /* _Stl_tenpow[36]=(10**307)/(2**1020) */

ULL(0xfd87b5f28300ca0e), /* _Stl_tenpow[37]=(10**-28)/(2**-93) */

ULL(0xfb158592be068d2f), /* _Stl_tenpow[38]=(10**-56)/(2**-186) */

ULL(0xf8a95fcf88747d94), /* _Stl_tenpow[39]=(10**-84)/(2**-279) */

ULL(0xf64335bcf065d37d), /* _Stl_tenpow[40]=(10**-112)/(2**-372) */

ULL(0xf3e2f893dec3f126), /* _Stl_tenpow[41]=(10**-140)/(2**-465) */

ULL(0xf18899b1bc3f8ca2), /* _Stl_tenpow[42]=(10**-168)/(2**-558) */

ULL(0xef340a98172aace5), /* _Stl_tenpow[43]=(10**-196)/(2**-651) */

ULL(0xece53cec4a314ebe), /* _Stl_tenpow[44]=(10**-224)/(2**-744) */

ULL(0xea9c227723ee8bcb), /* _Stl_tenpow[45]=(10**-252)/(2**-837)     */

ULL(0xe858ad248f5c22ca), /* _Stl_tenpow[46]=(10**-280)/(2**-930) */

ULL(0xe61acf033d1a45df), /* _Stl_tenpow[47]=(10**-308)/(2**-1023)    */

ULL(0xe3e27a444d8d98b8), /* _Stl_tenpow[48]=(10**-336)/(2**-1116) */

ULL(0xe1afa13afbd14d6e)  /* _Stl_tenpow[49]=(10**-364)/(2**-1209) */

#else    //*TY 03/20/2000 - added support for SCpp which lacks native 64bit integer type

static const UnsignedWide _Stl_tenpow[80] = {

ULL2(0xa0000000,0x00000000), /* _Stl_tenpow[0]=(10**1)/(2**4) */

ULL2(0xc8000000,0x00000000), /* _Stl_tenpow[1]=(10**2)/(2**7) */

ULL2(0xfa000000,0x00000000), /* _Stl_tenpow[2]=(10**3)/(2**10) */

ULL2(0x9c400000,0x00000000), /* _Stl_tenpow[3]=(10**4)/(2**14) */

ULL2(0xc3500000,0x00000000), /* _Stl_tenpow[4]=(10**5)/(2**17) */

ULL2(0xf4240000,0x00000000), /* _Stl_tenpow[5]=(10**6)/(2**20) */

ULL2(0x98968000,0x00000000), /* _Stl_tenpow[6]=(10**7)/(2**24) */

ULL2(0xbebc2000,0x00000000), /* _Stl_tenpow[7]=(10**8)/(2**27) */

ULL2(0xee6b2800,0x00000000), /* _Stl_tenpow[8]=(10**9)/(2**30) */

ULL2(0x9502f900,0x00000000), /* _Stl_tenpow[9]=(10**10)/(2**34) */

ULL2(0xba43b740,0x00000000), /* _Stl_tenpow[10]=(10**11)/(2**37) */

ULL2(0xe8d4a510,0x00000000), /* _Stl_tenpow[11]=(10**12)/(2**40) */

ULL2(0x9184e72a,0x00000000), /* _Stl_tenpow[12]=(10**13)/(2**44) */

ULL2(0xb5e620f4,0x80000000), /* _Stl_tenpow[13]=(10**14)/(2**47) */

ULL2(0xe35fa931,0xa0000000), /* _Stl_tenpow[14]=(10**15)/(2**50) */

ULL2(0x8e1bc9bf,0x04000000), /* _Stl_tenpow[15]=(10**16)/(2**54) */

ULL2(0xb1a2bc2e,0xc5000000), /* _Stl_tenpow[16]=(10**17)/(2**57) */

ULL2(0xde0b6b3a,0x76400000), /* _Stl_tenpow[17]=(10**18)/(2**60) */

ULL2(0x8ac72304,0x89e80000), /* _Stl_tenpow[18]=(10**19)/(2**64) */

ULL2(0xad78ebc5,0xac620000), /* _Stl_tenpow[19]=(10**20)/(2**67) */

ULL2(0xd8d726b7,0x177a8000), /* _Stl_tenpow[20]=(10**21)/(2**70) */

ULL2(0x87867832,0x6eac9000), /* _Stl_tenpow[21]=(10**22)/(2**74) */

ULL2(0xa968163f,0x0a57b400), /* _Stl_tenpow[22]=(10**23)/(2**77) */

ULL2(0xd3c21bce,0xcceda100), /* _Stl_tenpow[23]=(10**24)/(2**80) */

ULL2(0x84595161,0x401484a0), /* _Stl_tenpow[24]=(10**25)/(2**84) */

ULL2(0xa56fa5b9,0x9019a5c8), /* _Stl_tenpow[25]=(10**26)/(2**87) */

ULL2(0xcecb8f27,0xf4200f3a), /* _Stl_tenpow[26]=(10**27)/(2**90) */

ULL2(0xd0cf4b50,0xcfe20766), /* _Stl_tenpow[27]=(10**55)/(2**183) */

ULL2(0xd2d80db0,0x2aabd62c), /* _Stl_tenpow[28]=(10**83)/(2**276) */

ULL2(0xd4e5e2cd,0xc1d1ea96), /* _Stl_tenpow[29]=(10**111)/(2**369) */

ULL2(0xd6f8d750,0x9292d603), /* _Stl_tenpow[30]=(10**139)/(2**462) */

ULL2(0xd910f7ff,0x28069da4), /* _Stl_tenpow[31]=(10**167)/(2**555) */

ULL2(0xdb2e51bf,0xe9d0696a), /* _Stl_tenpow[32]=(10**195)/(2**648) */

ULL2(0xdd50f199,0x6b947519), /* _Stl_tenpow[33]=(10**223)/(2**741) */

ULL2(0xdf78e4b2,0xbd342cf7), /* _Stl_tenpow[34]=(10**251)/(2**834) */

ULL2(0xe1a63853,0xbbd26451), /* _Stl_tenpow[35]=(10**279)/(2**927) */

ULL2(0xe3d8f9e5,0x63a198e5), /* _Stl_tenpow[36]=(10**307)/(2**1020) */

ULL2(0xfd87b5f2,0x8300ca0e), /* _Stl_tenpow[37]=(10**-28)/(2**-93) */

ULL2(0xfb158592,0xbe068d2f), /* _Stl_tenpow[38]=(10**-56)/(2**-186) */

ULL2(0xf8a95fcf,0x88747d94), /* _Stl_tenpow[39]=(10**-84)/(2**-279) */

ULL2(0xf64335bc,0xf065d37d), /* _Stl_tenpow[40]=(10**-112)/(2**-372) */

ULL2(0xf3e2f893,0xdec3f126), /* _Stl_tenpow[41]=(10**-140)/(2**-465) */

ULL2(0xf18899b1,0xbc3f8ca2), /* _Stl_tenpow[42]=(10**-168)/(2**-558) */

ULL2(0xef340a98,0x172aace5), /* _Stl_tenpow[43]=(10**-196)/(2**-651) */

ULL2(0xece53cec,0x4a314ebe), /* _Stl_tenpow[44]=(10**-224)/(2**-744) */

ULL2(0xea9c2277,0x23ee8bcb), /* _Stl_tenpow[45]=(10**-252)/(2**-837)     */

ULL2(0xe858ad24,0x8f5c22ca), /* _Stl_tenpow[46]=(10**-280)/(2**-930) */

ULL2(0xe61acf03,0x3d1a45df), /* _Stl_tenpow[47]=(10**-308)/(2**-1023)    */

ULL2(0xe3e27a44,0x4d8d98b8), /* _Stl_tenpow[48]=(10**-336)/(2**-1116) */

ULL2(0xe1afa13a,0xfbd14d6e)  /* _Stl_tenpow[49]=(10**-364)/(2**-1209) */

#endif

};

static const short _Stl_twoexp[80] = {

4,7,10,14,17,20,24,27,30,34,37,40,44,47,50,54,57,60,64,67,70,74,77,80,84,87,90,

183,276,369,462,555,648,741,834,927,1020,

-93,-186,-279,-372,-465,-558,-651,-744,-837,-930,-1023,-1116,-1209

};

#define  TEN_1  0           /* offset to 10 **   1 */

#define  TEN_27   26        /* offset to 10 **  27 */

#define  TEN_M28  37        /* offset to 10 ** -28 */

#define  NUM_HI_P 11

#define  NUM_HI_N 13

#define _Stl_HIBITULL (ULL(1) << 63)

static void _Stl_norm_and_round(uint64& p, int& norm, uint64 prodhi, uint64 prodlo) {

  norm = 0;

  if ((prodhi & _Stl_HIBITULL) == 0) {

                                /* leading bit is a zero

                                 * may have to normalize

                                 */

    if ((prodhi == ~_Stl_HIBITULL) &&

        ((prodlo >> 62) == 0x3)) {  /* normalization followed by round

                                     * would cause carry to create

                                     * extra bit, so don't normalize

                                     */

      p = _Stl_HIBITULL;

      return;

    }

    p = (prodhi << 1) | (prodlo >> 63); /* normalize */

    norm = 1;

    prodlo <<= 1;

  }

  else {

    p = prodhi;

  }

  if ((prodlo & _Stl_HIBITULL) != 0) {     /* first guard bit a one */    //*TY 03/25/2000 - added explicit comparison to zero to avoid reliance to the implicit conversion from uint64 to bool

#if !defined (__SC__)                  //*TY 03/25/2000 -

    if (((p & 0x1) != 0) ||

        prodlo != _Stl_HIBITULL ) {    /* not borderline for round to even */

#else                                 //*TY 03/25/2000 - added workaround for SCpp compiler

    bool b1 = ((p & 0x1) != 0);

    if (b1 || prodlo != _Stl_HIBITULL) { //*TY 03/25/2000 - SCpp confuses on this particular original boolean expression

#endif                                    //*TY 03/25/2000 -

      /* round */

      ++p;

      if (p == 0)

        ++p;

    }

  }

  return;

}

// Convert a 64-bitb fraction * 10^exp to a 64-bit fraction * 2^bexp.

// p:    64-bit fraction

// exp:  base-10 exponent

// bexp: base-2 exponent (output parameter)

static void _Stl_tenscale(uint64& p, int exp, int& bexp) {

  uint64 prodhi, prodlo;        /* 128b product */

  int exp_hi, exp_lo;           /* exp = exp_hi*32 + exp_lo */

  int hi, lo, tlo, thi;         /* offsets in power of ten table */

  int norm;                     /* number of bits of normalization */

  int num_hi;                   /* number of high exponent powers */

  bexp = 0;

  if (exp > 0) {                 /* split exponent */

    exp_lo = exp;

    exp_hi = 0;

    if (exp_lo > 27) {

      exp_lo++;

      while (exp_lo > 27) {

        exp_hi++;

        exp_lo -= 28;

      }

    }

    tlo = TEN_1;

    thi = TEN_27;

    num_hi = NUM_HI_P;

  }

  else if (exp < 0) {

    exp_lo = exp;

    exp_hi = 0;

    while (exp_lo < 0) {

      exp_hi++;

      exp_lo += 28;

    }

    tlo = TEN_1;

    thi = TEN_M28;

    num_hi = NUM_HI_N;

  }

  else {                        /* no scaling needed */

    return;

  }

  while (exp_hi) {               /* scale */

    hi = (min) (exp_hi, num_hi);    /* only a few large powers of 10 */

    exp_hi -= hi;               /* could iterate in extreme case */

    hi += thi-1;

    _Stl_mult64(p, _Stl_tenpow[hi], prodhi, prodlo);

    _Stl_norm_and_round(p, norm, prodhi, prodlo);

    bexp += _Stl_twoexp[hi] - norm;

  }

  if (exp_lo) {

    lo = tlo + exp_lo -1;

    _Stl_mult64(p, _Stl_tenpow[lo], prodhi, prodlo);

    _Stl_norm_and_round(p, norm, prodhi, prodlo);

    bexp += _Stl_twoexp[lo] - norm;

  }

  return;

}

// First argument is a buffer of values from 0 to 9, NOT ascii.

// Second argument is number of digits in buffer, 1 <= digits <= 17.

// Third argument is base-10 exponent.

#if defined (__SC__) || defined (__MRC__)

//*TY 04/06/2000 - powermac's 68K emulator utilizes apple's SANE floating point, which is not compatible with IEEE format.

_STLP_MOVE_TO_STD_NAMESPACE

_STLP_END_NAMESPACE

#  include <fp.h>

_STLP_BEGIN_NAMESPACE

_STLP_MOVE_TO_PRIV_NAMESPACE

static inline double _Stl_atod(char *buffer, int ndigit, int dexp) {

  decimal d;  // ref. inside macintosh powerpc numerics p.9-13

  d.sgn = 0;

  d.exp = dexp;

  d.sig.length = ndigit;

  for (int i = 0; i < ndigit; ++i) {

    d.sig.text[i] = buffer[i] + '0';

  }

  return dec2num(&d);

}

#else  /* IEEE representation */

#  if !defined (__linux__)

static double _Stl_atod(char *buffer, int ndigit, int dexp) {

  uint64 value;         /* Value develops as follows:

                                 * 1) decimal digits as an integer

                                 * 2) left adjusted fraction

                                 * 3) right adjusted fraction

                                 * 4) exponent and fraction

                                 */

  uint32 guard;         /* First guard bit */

  uint64 rest;          /* Remaining guard bits */

  int bexp;             /* binary exponent */

  int nzero;            /* number of non-zero bits */

  int sexp;             /* scaling exponent */

  char *bufferend;              /* pointer to char after last digit */

  /* Check for zero and treat it as a special case */

  if (buffer == 0){

    return 0.0;

  }

  /* Convert the decimal digits to a binary integer. */

  bufferend = buffer + ndigit;

  value = 0;

  while (buffer < bufferend) {

    value *= 10;

    value += *buffer++;

  }

  /* Check for zero and treat it as a special case */

  if (value == 0) {

    return 0.0;

  }

  /* Normalize value */

  bexp = 64;                    /* convert from 64b int to fraction */

  /* Count number of non-zeroes in value */

  nzero = 0;

  if ((value >> 32) != 0) { nzero  = 32; }    //*TY 03/25/2000 - added explicit comparison to zero to avoid uint64 to bool conversion operator

  if ((value >> (16 + nzero)) != 0) { nzero += 16; }

  if ((value >> ( 8 + nzero)) != 0) { nzero +=  8; }

  if ((value >> ( 4 + nzero)) != 0) { nzero +=  4; }

  if ((value >> ( 2 + nzero)) != 0) { nzero +=  2; }

  if ((value >> ( 1 + nzero)) != 0) { nzero +=  1; }

  if ((value >> (     nzero)) != 0) { nzero +=  1; }

  /* Normalize */

  value <<= /*(uint64)*/ (64 - nzero);    //*TY 03/25/2000 - removed extraneous cast to uint64

  bexp -= 64 - nzero;

  /* At this point we have a 64b fraction and a binary exponent

   * but have yet to incorporate the decimal exponent.

   */

  /* multiply by 10^dexp */

  _Stl_tenscale(value, dexp, sexp);

  bexp += sexp;

  if (bexp <= -1022) {          /* HI denorm or underflow */

    bexp += 1022;

    if (bexp < -53) {          /* guaranteed underflow */

      value = 0;

    }

    else {                      /* denorm or possible underflow */

      int lead0 = 12 - bexp;          /* 12 sign and exponent bits */

      /* we must special case right shifts of more than 63 */

      if (lead0 > 64) {

        rest = value;

        guard = 0;

        value = 0;

      }

      else if (lead0 == 64) {

        rest = value & ((ULL(1)<< 63)-1);

#if !defined(__SC__)

        guard = (uint32) ((value>> 63) & 1 );

#else

        guard = to_ulong((value>> 63) & 1 );   //*TY 03/25/2000 - use member function instead of problematic conversion operator utilization

#endif

        value = 0;

      }

      else {

        rest = value & (((ULL(1) << lead0)-1)-1);

#if !defined(__SC__)

        guard = (uint32) (((value>> lead0)-1) & 1);

#else     //*TY 03/25/2000 -

        guard = to_ulong(((value>> lead0)-1) & 1);

#endif    //*TY 03/25/2000 -

        value >>= /*(uint64)*/ lead0; /* exponent is zero */

      }

      /* Round */

      if (guard && ((value & 1) || rest) ) {

        ++value;

        if (value == (ULL(1) << 52)) { /* carry created normal number */

          value = 0;

          _Stl_set_exponent(value, 1);

        }

      }

    }

  }

  else {                        /* not zero or denorm */

    /* Round to 53 bits */

    rest = value & (1<<10)-1;