1 /*-------------------------------------------------------------------------
2 _schar2fs.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 // float __schar2fs (char c)
dummy(void)37 static void dummy(void) __naked
38 {
39 __asm
40 .globl ___schar2fs
41 ___schar2fs:
42 mov r4, dpl
43 clr a
44 mov r3, a
45 mov r2, a
46 mov r1, a
47 mov a, #134
48 ljmp slong2fs_doit
49 __endasm;
50 }
51
52 #else
53
54 /* convert signed char to float */
__schar2fs(signed char sc)55 float __schar2fs (signed char sc) {
56 return __slong2fs(sc);
57 }
58
59 #endif
60