sdcc/device/lib/_fscmp.c

   1 /*-------------------------------------------------------------------------
   2    _fscmp.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 static void dummy(void) __naked
  37 {
  38         __asm
  39
  40         .globl  fs_compare_uint32
  41 fs_compare_uint32:
  42         mov     r1, #1
  43         mov     r2, dpl
  44         mov     a, @r0
  45         mov     dpl, r7
  46         cjne    a, dpl, compare32_done
  47         dec     r0
  48         mov     a, @r0
  49         cjne    a, b, compare32_done
  50         dec     r0
  51         mov     a, @r0
  52         cjne    a, dph, compare32_done
  53         dec     r0
  54         mov     a, @r0
  55         mov     dpl, r2
  56         cjne    a, dpl, compare32_done
  57         mov     r1, #0
  58 compare32_done:
  59         ret
  60
  61
  62         .globl  fs_check_negative_zeros
  63 fs_check_negative_zeros:
  64 a_check:
  65         cjne    a, #0x80, a_not_neg_zero
  66         mov     a, b
  67         jnz     a_not_neg_zero_cleanup
  68         mov     a, dph
  69         jnz     a_not_neg_zero_cleanup
  70         mov     a, dpl
  71         jnz     a_not_neg_zero_cleanup
  72         mov     r7, #0
  73 a_not_neg_zero_cleanup:
  74         mov     a, r7
  75 a_not_neg_zero:
  76
  77 b_check:
  78         cjne    @r0, #0x80, b_not_neg_zero
  79         dec     r0
  80         cjne    @r0, #0, b_not_neg_zero_cleanup_1
  81         dec     r0
  82         cjne    @r0, #0, b_not_neg_zero_cleanup_2
  83         dec     r0
  84         cjne    @r0, #0, b_not_neg_zero_cleanup_3
  85         inc     r0
  86         inc     r0
  87         inc     r0
  88         mov     @r0, #0
  89         ret
  90 b_not_neg_zero_cleanup_3:
  91         inc     r0
  92 b_not_neg_zero_cleanup_2:
  93         inc     r0
  94 b_not_neg_zero_cleanup_1:
  95         inc     r0
  96 b_not_neg_zero:
  97         ret
  98
  99         __endasm;
 100 }
 101
 102 #endif