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/*-------------------------------------------------------------------------
_ulong2fs.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
// float long __ulong2fs (float x)
static void dummy(void) __naked
{
__asm
.globl ___ulong2fs
___ulong2fs:
mov r4, a
mov r3, b
mov r2, dph
mov r1, dpl
mov a, #158
.globl ulong2fs_doit
ulong2fs_doit:
clr sign_a
long2fs_doit:
mov exp_a, a
lcall fs_normalize_a
ljmp fs_round_and_return
__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;
};
float __ulong2fs (unsigned long a )
{
unsigned char exp = 24 + EXCESS;
volatile union float_long fl;
if (!a)
{
return 0.0;
}
while (a < HIDDEN)
{
a <<= 1;
exp--;
}
while (a & NORM)
{
// we lose accuracy here
if (a & 1)
a += 2;
a >>= 1;
exp++;
}
a &= ~HIDDEN ;
/* pack up and go home */
fl.l = PACK(0,(unsigned long)exp, a);
return (fl.f);
}
#endif
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