libgcc-math/dbl-64/MathLib.h

   1 /*
   2  * IBM Accurate Mathematical Library
   3  * Written by International Business Machines Corp.
   4  * Copyright (C) 2001 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, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /********************************************************************/
  22 /* Ultimate math functions. Each function computes the exact        */
  23 /* theoretical value of its argument rounded to nearest or even.    */
  24 /*                                                                  */
  25 /* Assumption: Machine arithmetic operations are performed in       */
  26 /* round nearest mode of IEEE 754 standard.                         */
  27 /********************************************************************/
  28
  29 #ifndef UMATH_LIB
  30 #define UMATH_LIB
  31 /********************************************************************/
  32 /* Function changes the precision mode to IEEE 754 double precision */
  33 /* and the rounding mode to nearest or even.                        */
  34 /* It returns the original status of these modes.                   */
  35 /* See further explanations of usage in DPChange.h                  */
  36 /********************************************************************/
  37 unsigned short Init_Lib(void);
  38
  39 /********************************************************************/
  40 /* Function that changes the precision and rounding modes to the    */
  41 /* specified by the argument received. See further explanations in  */
  42 /* DPChange.h                                                       */
  43 /********************************************************************/
  44 void Exit_Lib(unsigned short);
  45
  46
  47 /* The  asin() function calculates the arc sine of its argument.    */
  48 /* The  function returns the arc sine in radians                    */
  49 /* (between -PI/2 and PI/2).                                        */
  50 /* If the argument is greater than 1 or less than -1 it returns     */
  51 /* a NaN.                                                           */
  52 double uasin(double );
  53
  54
  55 /* The  acos() function calculates the arc cosine of its argument.  */
  56 /* The  function returns the arc cosine in radians                  */
  57 /* (between -PI/2 and PI/2).                                        */
  58 /* If the argument is greater than 1 or less than -1 it returns     */
  59 /* a NaN.                                                           */
  60 double uacos(double );
  61
  62 /* The  atan() function calculates the arctanget of its argument.   */
  63 /* The  function returns the arc tangent in radians                 */
  64 /* (between -PI/2 and PI/2).                                        */
  65 double uatan(double );
  66
  67
  68 /* The uatan2() function calculates the arc tangent of the two arguments x   */
  69 /* and y (x is the right argument and y is the left one).The signs of both   */
  70 /* arguments are used to determine the quadrant of the result.               */
  71 /* The function returns the result in radians, which is between -PI and PI   */
  72 double uatan2(double ,double );
  73
  74 /* Compute log(x). The base of log is e (natural logarithm)         */
  75 double ulog(double );
  76
  77 /* Compute e raised to the power of argument x.                     */
  78 double uexp(double );
  79
  80 /* Compute sin(x). The argument x is assumed to be given in radians.*/
  81 double usin(double );
  82
  83 /* Compute cos(x). The argument x is assumed to be given in radians.*/
  84 double ucos(double );
  85
  86 /* Compute tan(x). The argument x is assumed to be given in radians.*/
  87 double utan(double );
  88
  89 /* Compute the square root of non-negative argument x.              */
  90 /* If x is negative the returned value is NaN.                      */
  91 double usqrt(double );
  92
  93 /* Compute x raised to the power of y, where x is the left argument */
  94 /* and y is the right argument. The function returns a NaN if x<0.  */
  95 /* If x equals zero it returns -inf                                 */
  96 double upow(double , double );
  97
  98 /* Computing x mod y, where x is the left argument and y is the     */
  99 /* right one.                                                       */
 100 double uremainder(double , double );
 101
 102
 103 #endif