sdcc/device/lib/_uint2fs.c

   1 /*-------------------------------------------------------------------------
   2    _uint2fs.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 #define __SDCC_FLOAT_LIB
  30 #include <float.h>
  31
  32
  33 #ifdef FLOAT_ASM_MCS51
  34
  35 // float long __uint2fs (float x)
  36 static void dummy(void) __naked
  37 {
  38         __asm
  39         .globl  ___uint2fs
  40 ___uint2fs:
  41         clr     a
  42         mov     r4, dph
  43         mov     r3, dpl
  44         mov     r2, a
  45         mov     r1, a
  46         mov     a, #142
  47         ljmp    ulong2fs_doit
  48         __endasm;
  49 }
  50
  51 #else
  52
  53 /* convert unsigned int to float */
  54 float __uint2fs (unsigned int ui) __SDCC_FLOAT_NONBANKED
  55 {
  56   return __ulong2fs(ui);
  57 }
  58
  59 #endif