source: trunk/libs/newlib/src/newlib/libc/stdlib/strtold.c @ 577

/*
(C) Copyright IBM Corp. 2009

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specific prior written permission.

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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
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*/

#include <stdlib.h>
#include "local.h"
#include "mprec.h"
#undef FLT_ROUNDS

#ifdef _HAVE_LONG_DOUBLE

/* Intel MCU has no x87 floating point unit */
#if (defined (__x86_64__) || defined (__i386__)) && !defined (__iamcu__)
static const int map[] = {
        1,      /* round to nearest */
        3,      /* round to zero */
        2,      /* round to negative infinity */
        0       /* round to positive infinity */
};

int
__flt_rounds(void)
{
        int x;

        /* Assume that the x87 and the SSE unit agree on the rounding mode. */
        __asm("fnstcw %0" : "=m" (x));
        return (map[(x >> 10) & 0x03]);
}
#define FLT_ROUNDS __flt_rounds()
#else
#define FLT_ROUNDS 0
#endif

long double
_strtold_r (struct _reent *ptr, const char *__restrict s00,
            char **__restrict se)
{
#ifdef _LDBL_EQ_DBL
  /* On platforms where long double is as wide as double.  */
  return _strtod_l (ptr, s00, se, __get_current_locale ());
#else
  long double result;

  _strtorx_l (ptr, s00, se, FLT_ROUNDS, &result, __get_current_locale ());
  return result;
#endif
}

long double
strtold_l (const char *__restrict s00, char **__restrict se, locale_t loc)
{
#ifdef _LDBL_EQ_DBL
  /* On platforms where long double is as wide as double.  */
  return _strtod_l (_REENT, s00, se, loc);
#else
  long double result;

  _strtorx_l (_REENT, s00, se, FLT_ROUNDS, &result, loc);
  return result;
#endif
}

long double
strtold (const char *__restrict s00, char **__restrict se)
{
#ifdef _LDBL_EQ_DBL
  /* On platforms where long double is as wide as double.  */
  return _strtod_l (_REENT, s00, se, __get_current_locale ());
#else
  long double result;

  _strtorx_l (_REENT, s00, se, FLT_ROUNDS, &result, __get_current_locale ());
  return result;
#endif
}

#endif /* _HAVE_LONG_DOUBLE */