1 /* Floating point library in optimized assembly for 8051
2 * Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #define SDCC_FLOAT_LIB
24 #ifdef FLOAT_ASM_MCS51
26 //float __fssub (float a, float b) reentrant
27 static void dummy(void) _naked
48 ** libgcc support for software floating point.
49 ** Copyright (C) 1991 by Pipeline Associates, Inc. All rights reserved.
50 ** Permission is granted to do *anything* you want with this file,
51 ** commercial or otherwise, provided this message remains intact. So there!
52 ** I would appreciate receiving any updates/patches/changes that anyone
53 ** makes, and am willing to be the repository for said changes (am I
54 ** making a big mistake?).
57 ** Pipeline Associates, Inc.
58 ** pipeline!phw@motown.com or
59 ** sun!pipeline!phw or
60 ** uunet!motown!pipeline!phw
63 /* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
72 /* subtract two floats */
73 float __fssub (float a1, float a2)
75 volatile union float_long fl1, fl2;
80 /* check for zero args */
86 /* twiddle sign bit and add */