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  1. /*-------------------------------------------------------------------------
  2.    math.h: Floating point math function declarations
  3.  
  4.    Copyright (C) 2001, Jesus Calvino-Fraga, jesusc@ieee.org
  5.  
  6.    This library is free software; you can redistribute it and/or modify it
  7.    under the terms of the GNU General Public License as published by the
  8.    Free Software Foundation; either version 2, or (at your option) any
  9.    later version.
  10.  
  11.    This library 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 General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with this library; see the file COPYING. If not, write to the
  18.    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  19.    MA 02110-1301, USA.
  20.  
  21.    As a special exception, if you link this library with other files,
  22.    some of which are compiled with SDCC, to produce an executable,
  23.    this library does not by itself cause the resulting executable to
  24.    be covered by the GNU General Public License. This exception does
  25.    not however invalidate any other reasons why the executable file
  26.    might be covered by the GNU General Public License.
  27. -------------------------------------------------------------------------*/
  28.  
  29. /* Version 1.0 - Initial release */
  30.  
  31. #ifndef _INC_MATH
  32. #define _INC_MATH
  33.  
  34. #define HUGE_VALF   3.402823466e+38
  35.  
  36. #define PI          3.1415926536
  37. #define TWO_PI      6.2831853071
  38. #define HALF_PI     1.5707963268
  39. #define QUART_PI    0.7853981634
  40. #define iPI         0.3183098862
  41. #define iTWO_PI     0.1591549431
  42. #define TWO_O_PI    0.6366197724
  43.  
  44. /* EPS=B**(-t/2), where B is the radix of the floating-point representation
  45.    and there are t base-B digits in the significand.  Therefore, for floats
  46.    EPS=2**(-12).  Also define EPS2=EPS*EPS. */
  47. #define EPS 244.14062E-6
  48. #define EPS2 59.6046E-9
  49.  
  50. union float_long
  51. {
  52.     float f;
  53.     long l;
  54. };
  55.  
  56. #if defined(__SDCC_MATH_LIB) && defined(__SDCC_mcs51) && !defined(__SDCC_USE_XSTACK) && !defined(__SDCC_STACK_AUTO) && !defined(_SDCC_NO_ASM_LIB_FUNCS)
  57. /* Compile the mcs51 assembly version only when all these
  58.    conditions are met.  Since not all the functions are
  59.    reentrant, do not compile with --stack-auto is used. */
  60. #define MATH_ASM_MCS51
  61. #endif
  62.  
  63.  
  64. /* Functions on the z80 & gbz80 are always reentrant and so the "reentrant" */
  65. /* keyword is not defined. */
  66. #if defined(__SDCC_z80) || defined(__SDCC_z180) || defined(__SDCC_r2k) || defined(__SDCC_r3ka) || defined(__SDCC_tlcs90) || defined(__SDCC_gbz80) || defined(__SDCC_ez80_z80) || defined(__SDCC_stm8)
  67. #define _FLOAT_FUNC_REENTRANT
  68. #else
  69. #define _FLOAT_FUNC_REENTRANT __reentrant
  70. #endif
  71.  
  72. /**********************************************
  73.  * Prototypes for float ANSI C math functions *
  74.  **********************************************/
  75.  
  76. /* Trigonometric functions */
  77. float sinf(float x) _FLOAT_FUNC_REENTRANT;
  78. float cosf(float x) _FLOAT_FUNC_REENTRANT;
  79. float tanf(float x) _FLOAT_FUNC_REENTRANT;
  80. float cotf(float x) _FLOAT_FUNC_REENTRANT;
  81. float asinf(float x) _FLOAT_FUNC_REENTRANT;
  82. float acosf(float x) _FLOAT_FUNC_REENTRANT;
  83. float atanf(float x) _FLOAT_FUNC_REENTRANT;
  84. float atan2f(float x, float y);
  85.  
  86. /* Hyperbolic functions */
  87. float sinhf(float x) _FLOAT_FUNC_REENTRANT;
  88. float coshf(float x) _FLOAT_FUNC_REENTRANT;
  89. float tanhf(float x) _FLOAT_FUNC_REENTRANT;
  90.  
  91. /* Exponential, logarithmic and power functions */
  92. float expf(float x) _FLOAT_FUNC_REENTRANT;
  93. float logf(float x) _FLOAT_FUNC_REENTRANT;
  94. float log10f(float x) _FLOAT_FUNC_REENTRANT;
  95. float powf(float x, float y);
  96. float sqrtf(float a) _FLOAT_FUNC_REENTRANT;
  97.  
  98. /* Nearest integer, absolute value, and remainder functions */
  99. float fabsf(float x) _FLOAT_FUNC_REENTRANT;
  100. float frexpf(float x, int *pw2);
  101. float ldexpf(float x, int pw2);
  102. float ceilf(float x) _FLOAT_FUNC_REENTRANT;
  103. float floorf(float x) _FLOAT_FUNC_REENTRANT;
  104. float modff(float x, float * y);
  105.  
  106. int isnan(float f);
  107. int isinf(float f);
  108. #endif  /* _INC_MATH */
  109.