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  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
  103.