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/*-------------------------------------------------------------------------
_fsrshift.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
static void dummy(void) __naked
{
__asm
.globl fs_rshift_a
fs_rshift_a:
jz 00020$
mov r0, a
add a, exp_a // adjust exponent
jnc 00001$
mov a, #255 // don't roll over
00001$:
mov exp_a, a
#ifdef FLOAT_SHIFT_SPEEDUP
mov a, r0
add a, #248
jnc 00003$
xch a, r4
xch a, r3
xch a, r2
mov r1, a
clr a
xch a, r4
//mov r1, ar2 // avoid dependence on register bank
//mov r2, ar3
//mov r3, ar4
//mov r4, #0
add a, #248
jnc 00003$
xch a, r3
xch a, r2
mov r1, a
clr a
xch a, r3
//mov r1, ar2
//mov r2, ar3
//mov r3, #0
add a, #248
jnc 00003$
xch a, r2
mov r1, a
clr a
xch a, r2
//mov r1, ar2
//mov r2, #0
add a, #248
jnc 00003$
mov r1, #0
ret
00003$:
add a, #8
jz 00020$
mov r0, a
#endif
00005$:
clr c
mov a, r4
rrc a
mov r4, a
mov a, r3
rrc a
mov r3, a
mov a, r2
rrc a
mov r2, a
mov a, r1
rrc a
mov r1, a
djnz r0, 00005$
00020$:
ret
__endasm;
}
#endif
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