sdcc/device/lib/_uchar2fs.c

   1 /*-------------------------------------------------------------------------
   2    _uchar2fs.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 // float long __uchar2fs (float x)
  37 static void dummy(void) __naked
  38 {
  39         __asm
  40         .globl  ___uchar2fs
  41 ___uchar2fs:
  42         clr     a
  43         mov     r4, dpl
  44         mov     r3, a
  45         mov     r2, a
  46         mov     r1, a
  47         mov     a, #134
  48         ljmp    ulong2fs_doit
  49         __endasm;
  50 }
  51
  52 #else
  53
  54 /* convert unsigned char to float */
  55 float __uchar2fs (unsigned char uc) __SDCC_FLOAT_NONBANKED
  56 {
  57   return __ulong2fs(uc);
  58 }
  59
  60 #endif