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/*-------------------------------------------------------------------------
_fslt.c - Floating point library in optimized assembly for 8051
Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
As a special exception, if you link this library with other files,
some of which are compiled with SDCC, to produce an executable,
this library does not by itself cause the resulting executable to
be covered by the GNU General Public License. This exception does
not however invalidate any other reasons why the executable file
might be covered by the GNU General Public License.
-------------------------------------------------------------------------*/
#define __SDCC_FLOAT_LIB
#include <float.h>
#ifdef FLOAT_ASM_MCS51
// _Bool __fslt (float a, float b)
static void dummy(void) __naked
{
__asm
.globl ___fslt
___fslt:
mov r7, a
mov r0, sp
dec r0
dec r0
lcall fs_check_negative_zeros
setb sign_a
rlc a
mov a, @r0
jc a_negative
a_positive:
jnb acc.7, ab_positive
// a is positive and b is negative, so a > b
mov dpl, #0
ret
a_negative:
jb acc.7, ab_negative
// a is negative and b is positive, so a < b
mov dpl, #1
ret
ab_positive:
clr sign_a
ab_negative:
lcall fs_compare_uint32
mov a, r1
jnz ab_different
// a and b are equal
mov dpl, a
ret
ab_different:
jb sign_a, skip_invert
cpl c
skip_invert:
clr a
rlc a
mov dpl, a
ret
__endasm;
}
#else
/*
** libgcc support for software floating point.
** Copyright (C) 1991 by Pipeline Associates, Inc. All rights reserved.
** Permission is granted to do *anything* you want with this file,
** commercial or otherwise, provided this message remains intact. So there!
** I would appreciate receiving any updates/patches/changes that anyone
** makes, and am willing to be the repository for said changes (am I
** making a big mistake?).
**
** Pat Wood
** Pipeline Associates, Inc.
** pipeline!phw@motown.com or
** sun!pipeline!phw or
** uunet!motown!pipeline!phw
*/
/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
union float_long
{
float f;
long l;
};
/* compare two floats */
_Bool __fslt (float a1, float a2)
{
volatile union float_long fl1, fl2;
fl1.f = a1;
fl2.f = a2;
if (((fl1.l | fl2.l) & 0x7FFFFFFF) == 0)
return (0);
if (fl1.l<0 && fl2.l<0) {
if (fl2.l < fl1.l)
return (1);
return (0);
}
if (fl1.l < fl2.l)
return (1);
return (0);
}
#endif
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