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/* Copyright (c) 2002 Michael Stumpf <mistumpf@de.pepperl-fuchs.com>
Copyright (c) 2006 Dmitry Xmelkov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
/* $Id: floatsisf.S,v 1.7.2.1 2007/12/23 07:34:10 dmix Exp $ */
/* float __floatsisf (long)
float __floatunsisf (unsigned long)
*/
#include "fp32def.h"
#include "asmdef.h"
ENTRY __floatunsisf
clt
rjmp 1f
ENTRY __floatsisf
bst rA3, 7 ; sign
brtc 1f
; negate A
com rA3
com rA2
com rA1
neg rA0
sbci rA1, -1
sbci rA2, -1
sbci rA3, -1
1:
tst rA3
breq 4f
; shift to right
mov ZH, rA3
ldi rA3, 127 + 23 ; exponent
clr rAE
2: inc rA3
lsr ZH
ror rA2
ror rA1
ror rA0
ror rAE
cpse ZH, r1
rjmp 2b
; rounding
brpl .L_pack ; flags from 'ror rAE'
lsl rAE
brne 3f
sbrs rA0, 0 ; round to even
rjmp .L_pack
3: subi rA0, -1
sbci rA1, -1
sbci rA2, -1
sbci rA3, -1
rjmp .L_pack
4: tst rA2
breq 5f
ldi rA3, 127 + 23
rjmp 8f
5: tst rA1
breq 6f
ldi rA3, 127 + 15
mov rA2, rA1
mov rA1, rA0
rjmp 7f
6: tst rA0
breq 9f ; 0.0
ldi rA3, 127 + 7
mov rA2, rA0
ldi rA1, 0
7:
ldi rA0, 0
brmi .L_pack ; flag from 'tst rA*'
; shift to left by 1..7 positions
10: dec rA3
lsl rA0
rol rA1
rol rA2
8: brpl 10b
.L_pack:
lsl rA2
lsr rA3
ror rA2
bld rA3, 7 ; sign
9: ret
ENDFUNC
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