git.sur5r.net Git - cc65/blob - include/specialmath.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                              specialmath.h                                */
   4 /*                                                                           */
   5 /*                 Optimized math routines for special usages                */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2019 Christian 'Irgendwer' Krueger                                    */
  10 /*                                                                           */
  11 /* This software is provided 'as-is', without any expressed or implied       */
  12 /* warranty.  In no event will the authors be held liable for any damages    */
  13 /* arising from the use of this software.                                    */
  14 /*                                                                           */
  15 /* Permission is granted to anyone to use this software for any purpose,     */
  16 /* including commercial applications, and to alter it and redistribute it    */
  17 /* freely, subject to the following restrictions:                            */
  18 /*                                                                           */
  19 /* 1. The origin of this software must not be misrepresented; you must not   */
  20 /*    claim that you wrote the original software. If you use this software   */
  21 /*    in a product, an acknowledgment in the product documentation would be  */
  22 /*    appreciated but is not required.                                       */
  23 /* 2. Altered source versions must be plainly marked as such, and must not   */
  24 /*    be misrepresented as being the original software.                      */
  25 /* 3. This notice may not be removed or altered from any source              */
  26 /*    distribution.                                                          */
  27 /*                                                                           */
  28 /*****************************************************************************/
  29
  30 #ifndef _SPECIALMATH_H
  31 #define _SPECIALMATH_H
  32
  33
  34 /* Multiply an 8 bit unsigned value by 20 and return the 16 bit unsigned result */
  35
  36 unsigned int __fastcall__ mul20(unsigned char value);
  37
  38
  39 /* Multiply an 8 bit unsigned value by 40 and return the 16 bit unsigned result */
  40
  41 unsigned int __fastcall__ mul40(unsigned char value);
  42
  43
  44
  45 /* End of specialmath.h */
  46 #endif