sysdeps/ieee754/dbl-64/MathLib.h

   1 /*
   2  * IBM Accurate Mathematical Library
   3  * Written by International Business Machines Corp.
   4  * Copyright (C) 2001-2019 Free Software Foundation, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /********************************************************************/
  21 /* Ultimate math functions. Each function computes the exact        */
  22 /* theoretical value of its argument rounded to nearest or even.    */
  23 /*                                                                  */
  24 /* Assumption: Machine arithmetic operations are performed in       */
  25 /* round nearest mode of IEEE 754 standard.                         */
  26 /********************************************************************/
  27
  28 #ifndef UMATH_LIB
  29 #define UMATH_LIB
  30 /********************************************************************/
  31 /* Function changes the precision mode to IEEE 754 double precision */
  32 /* and the rounding mode to nearest or even.                        */
  33 /* It returns the original status of these modes.                   */
  34 /* See further explanations of usage in DPChange.h                  */
  35 /********************************************************************/
  36 unsigned short Init_Lib (void);
  37
  38 /********************************************************************/
  39 /* Function that changes the precision and rounding modes to the    */
  40 /* specified by the argument received. See further explanations in  */
  41 /* DPChange.h                                                       */
  42 /********************************************************************/
  43 void Exit_Lib (unsigned short);
  44
  45
  46 /* The  asin() function calculates the arc sine of its argument.    */
  47 /* The  function returns the arc sine in radians                    */
  48 /* (between -PI/2 and PI/2).                                        */
  49 /* If the argument is greater than 1 or less than -1 it returns     */
  50 /* a NaN.                                                           */
  51 double uasin (double);
  52
  53
  54 /* The  acos() function calculates the arc cosine of its argument.  */
  55 /* The  function returns the arc cosine in radians                  */
  56 /* (between -PI/2 and PI/2).                                        */
  57 /* If the argument is greater than 1 or less than -1 it returns     */
  58 /* a NaN.                                                           */
  59 double uacos (double);
  60
  61 /* The  atan() function calculates the arctanget of its argument.   */
  62 /* The  function returns the arc tangent in radians                 */
  63 /* (between -PI/2 and PI/2).                                        */
  64 double uatan (double);
  65
  66
  67 /* The uatan2() function calculates the arc tangent of the two arguments x   */
  68 /* and y (x is the right argument and y is the left one).The signs of both   */
  69 /* arguments are used to determine the quadrant of the result.               */
  70 /* The function returns the result in radians, which is between -PI and PI   */
  71 double uatan2 (double, double);
  72
  73 /* Compute log(x). The base of log is e (natural logarithm)         */
  74 double ulog (double);
  75
  76 /* Compute e raised to the power of argument x.                     */
  77 double uexp (double);
  78
  79 /* Compute sin(x). The argument x is assumed to be given in radians.*/
  80 double usin (double);
  81
  82 /* Compute cos(x). The argument x is assumed to be given in radians.*/
  83 double ucos (double);
  84
  85 /* Compute tan(x). The argument x is assumed to be given in radians.*/
  86 double utan (double);
  87
  88 /* Compute the square root of non-negative argument x.              */
  89 /* If x is negative the returned value is NaN.                      */
  90 double usqrt (double);
  91
  92 /* Compute x raised to the power of y, where x is the left argument */
  93 /* and y is the right argument. The function returns a NaN if x<0.  */
  94 /* If x equals zero it returns -inf                                 */
  95 double upow (double, double);
  96
  97 /* Computing x mod y, where x is the left argument and y is the     */
  98 /* right one.                                                       */
  99 double uremainder (double, double);
 100 #endif