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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: addsf3x.S,v 1.7 2007/01/14 15:05:48 dmix Exp $ */
/* <non_standart> __addsf3x (float_40 A, float_40 B);
Internal function to add float point numbers.
Input:
rA3.rA2.rA1.rA0.rAE - arg. A
rB3.rB2.rB1.rB0.rBE - arg. B
Output:
T
rA3
rA2.rA1.rA0.rAE.ZH
*/
#include "fp32def.h"
#include "asmdef.h"
FUNCTION __addsf3x
0: rcall _U(__fp_pscA)
brcs .L_nan
rcall _U(__fp_pscB)
brcs .L_nan
brne .L_inf ; B is finite --> return A
cpi rA3, 255
brne .L_infB ; A is finite --> return B
brtc .L_inf ; Inf + Inf with the same sign
.L_nan:
rjmp _U(__fp_nan)
.L_infB:
brtc .L_inf
com ZL
.L_inf:
bst ZL, 7
rjmp _U(__fp_inf)
ENTRY __addsf3x
mov ZL, rA3 ; save sign of A
rcall _U(__fp_split3)
brcs 0b
; compare A and B
cp rAE, rBE
cpc rA0, rB0
cpc rA1, rB1
cpc rA2, rB2
cpc rA3, rB3
brlo 2f ; fabs(A) < fabs(B)
brne 4f ; fabs(A) > fabs(B)
brtc .L_add
rjmp _U(__fp_zero) ; A + (-A) = +0.0
; swap A and B
2: brtc 3f
com ZL ; update sign
3: mov r0, rAE
mov rAE, rBE
mov rBE, r0
#if defined(__AVR_HAVE_MOVW__) && __AVR_HAVE_MOVW__
movw r0, rA0
movw rA0, rB0
movw rB0, r0
movw r0, rA2
movw rA2, rB2
movw rB2, r0
clr r1
#else
mov r0, rA0
mov rA0, rB0
mov rB0, r0
mov r0, rA1
mov rA1, rB1
mov rB1, r0
mov r0, rA2
mov rA2, rB2
mov rB2, r0
mov r0, rA3
mov rA3, rB3
mov rB3, r0
#endif
;
4: clr ZH
sub rB3, rA3
5: breq 7f ; shift is not needed
cpi rB3, -7
brsh 6f
cpi rB3, -32
brlo .L_ret
cp r1, rBE
sbci ZH, 0
mov rBE, rB0
mov rB0, rB1
mov rB1, rB2
clr rB2
subi rB3, -8
rjmp 5b
6: lsr rB2
ror rB1
ror rB0
ror rBE
sbci ZH, 0
inc rB3
brne 6b
7:
; direction ?
brtc .L_add
; A -= B
cp r1, ZH
sbc rAE, rBE
sbc rA0, rB0
sbc rA1, rB1
sbc rA2, rB2
brmi .L_ret
8: subi rA3, 1
breq 9f
lsl ZH
rol rAE
rol rA0
rol rA1
rol rA2
brpl 8b
rjmp .L_ret
.L_add:
add rAE, rBE
adc rA0, rB0
adc rA1, rB1
adc rA2, rB2
brcc .L_ret
ror rA2
ror rA1
ror rA0
ror rAE
ror ZH
cpi rA3, 254
brlo 9f
rjmp .L_inf
9: inc rA3
.L_ret:
lsl rA2
brcs 1f
clr rA3
1: lsl ZL ; sign
ror rA3
ror rA2
ret
ENDFUNC
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