Subversion Repositories NedoOS

Rev

Blame | Last modification | View Log | Download

  1. /*-------------------------------------------------------------------------
  2.    _fs2sint.c - Floating point library in optimized assembly for 8051
  3.  
  4.    Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
  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.  
  30. #define __SDCC_FLOAT_LIB
  31. #include <float.h>
  32.  
  33.  
  34. #ifdef FLOAT_ASM_MCS51
  35.  
  36. // int __fs2sint (float x)
  37. static void dummy(void) __naked
  38. {
  39.         __asm
  40.         .globl  ___fs2sint
  41. ___fs2sint:
  42.         lcall   ___fs2slong
  43.         jnz fs2sint_not_zero
  44.         mov a, dpl
  45.         orl a, dph
  46.         orl a, b
  47.         jnz fs2sint_clr_a
  48.         ret
  49. fs2sint_clr_a:
  50.         clr a
  51. fs2sint_not_zero:
  52.         jnb     sign_a, fs2sint_pos
  53. fs2sint_neg:
  54.         cpl     a
  55.         jnz     fs2sint_maxval_neg
  56.         mov     a, b
  57.         cpl     a
  58.         jnz     fs2sint_maxval_neg
  59.         mov     a, dph
  60.         jnb     acc.7, fs2sint_maxval_neg
  61.         ret
  62. fs2sint_maxval_neg:
  63.         mov     dptr, #0x8000
  64.         ret
  65. fs2sint_pos:
  66.         jnz     fs2sint_maxval_pos
  67.         mov     a, b
  68.         jnz     fs2sint_maxval_pos
  69.         mov     a, dph
  70.         jb      acc.7, fs2sint_maxval_pos
  71.         ret
  72. fs2sint_maxval_pos:
  73.         mov     dptr, #0x7FFF
  74.         ret
  75.         __endasm;
  76. }
  77.  
  78. #else
  79.  
  80. /* convert float to signed int */
  81. signed int __fs2sint (float f)
  82. {
  83.   signed long sl=__fs2slong(f);
  84.   if (sl>=INT_MAX)
  85.     return INT_MAX;
  86.   if (sl<=INT_MIN)
  87.     return -INT_MIN;
  88.   return sl;
  89. }
  90.  
  91. #endif
  92.