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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: fp_round.S,v 1.1 2007/01/14 14:58:36 dmix Exp $ */
#include "fp32def.h"
#include "asmdef.h"
/* float __fp_round (<non_standart>);
The __fp_round() function rounds an input number. This is an internal
function intended to run after __addsf3x() and like.
Input:
rA3.rA2.rA1.rA0.rAE - number in the flt40_t format
ZH - more lower bits are nonzero flag
*/
ENTRY __fp_round
; is A finite ?
mov r0, rA3
inc r0
lsl r0
brne 1f
tst rA2
brmi 3f ; no, A is not a finite number
; rounding
1: lsl rAE
brcc 3f
or rAE, ZH
brne 2f
sbrs rA0, 0 ; round to even
rjmp 3f
2: subi rA0, -1
sbci rA1, -1
sbci rA2, -1
sbci rA3, -1
3: ret
ENDFUNC
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