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  1. /*-------------------------------------------------------------------------
  2.    _fslt.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. // char __fslt (float a, float b)
  37. static void dummy(void) __naked
  38. {
  39.         __asm
  40.         .globl  ___fslt
  41. ___fslt:
  42.         mov     r7, a
  43.         mov     r0, sp
  44.         dec     r0
  45.         dec     r0
  46.         lcall   fs_check_negative_zeros
  47.         setb    sign_a
  48.         rlc     a
  49.         mov     a, @r0
  50.         jc      a_negative
  51. a_positive:
  52.         jnb     acc.7, ab_positive
  53.         // a is positive and b is negative, so a > b
  54.         mov     dpl, #0
  55.         ret
  56. a_negative:
  57.         jb      acc.7, ab_negative
  58.         // a is negative and b is positive, so a < b
  59.         mov     dpl, #1
  60.         ret
  61. ab_positive:
  62.         clr     sign_a
  63. ab_negative:
  64.         lcall   fs_compare_uint32
  65.         mov     a, r1
  66.         jnz     ab_different
  67.         // a and b are equal
  68.         mov     dpl, a
  69.         ret
  70. ab_different:
  71.         jb      sign_a, skip_invert
  72.         cpl     c
  73. skip_invert:
  74.         clr     a
  75.         rlc     a
  76.         mov     dpl, a
  77.         ret
  78.         __endasm;
  79. }
  80.  
  81. #else
  82.  
  83. /*
  84. ** libgcc support for software floating point.
  85. ** Copyright (C) 1991 by Pipeline Associates, Inc.  All rights reserved.
  86. ** Permission is granted to do *anything* you want with this file,
  87. ** commercial or otherwise, provided this message remains intact.  So there!
  88. ** I would appreciate receiving any updates/patches/changes that anyone
  89. ** makes, and am willing to be the repository for said changes (am I
  90. ** making a big mistake?).
  91. **
  92. ** Pat Wood
  93. ** Pipeline Associates, Inc.
  94. ** pipeline!phw@motown.com or
  95. ** sun!pipeline!phw or
  96. ** uunet!motown!pipeline!phw
  97. */
  98.  
  99. /* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
  100.  
  101. union float_long
  102.   {
  103.     float f;
  104.     long l;
  105.   };
  106.  
  107. /* compare two floats */
  108. char __fslt (float a1, float a2)
  109. {
  110.   volatile union float_long fl1, fl2;
  111.  
  112.   fl1.f = a1;
  113.   fl2.f = a2;
  114.  
  115.   if (((fl1.l | fl2.l) & 0x7FFFFFFF) == 0)
  116.     return (0);
  117.  
  118.   if (fl1.l<0 && fl2.l<0) {
  119.     if (fl2.l < fl1.l)
  120.       return (1);
  121.     return (0);
  122.   }
  123.  
  124.   if (fl1.l < fl2.l)
  125.     return (1);
  126.   return (0);
  127. }
  128.  
  129. #endif
  130.