Retro68/gcc/newlib/libc/stdlib/strtold.c

/*
(C) Copyright IBM Corp. 2009

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modification, are permitted provided that the following conditions are met:

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used to endorse or promote products derived from this software without
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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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 */