newlib/libm/machine/i386/f_llrintl.c

   1 /*
   2  * ====================================================
   3  * x87 FP implementation contributed to Newlib by
   4  * Dave Korn, November 2007.  This file is placed in the
   5  * public domain.  Permission to use, copy, modify, and
   6  * distribute this software is freely granted.
   7  * ====================================================
   8  */
   9
  10 #ifdef __GNUC__
  11 #if !defined(_SOFT_FLOAT)
  12
  13 #include <math.h>
  14
  15 /*
  16  * Fast math version of llrintl(x)
  17  * Return x rounded to integral value according to the prevailing
  18  * rounding mode.
  19  * Method:
  20  *      Using inline x87 asms.
  21  * Exception:
  22  *      Governed by x87 FPCR.
  23  */
  24
  25 long long int _f_llrintl (long double x)
  26 {
  27   long long int _result;
  28   asm ("fistpll %0" : "=m" (_result) : "t" (x) : "st");
  29   return _result;
  30 }
  31
  32 /* For now, we only have the fast math version.  */
  33 long long int llrintl (long double x) {
  34   return _f_llrintl(x);
  35 }
  36
  37 #endif /* !_SOFT_FLOAT */
  38 #endif /* __GNUC__ */