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/* -*- Mode: Asm -*- */
/* Copyright (c) 2002 Michael Stumpf <mistumpf@de.pepperl-fuchs.com>
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.
*/
/*
modf.S is part of FPlib V 0.3.0 ported to avr-as
for details see readme.fplib
*----------------------------------------------------------------------------------------
*
* A = modf(A,&B) *B = integral part of A
* A = fractional part of A
*/
#include "gasava.inc"
#include "fplib.inc"
TEXT_SEG(fplib, modf)
FUNCTION(modf)
GLOBAL(modf)
BST rA3,7
RCALL _U(__fp_split1) ; clears rAE
PUSH YL
PUSH YH
MOV YH,rPH
MOV YL,rPL ; pointer to double
CLR rB3
CLR rB2
CLR rB1
CLR rB0 ; preset zero integral part
TST rA3 ; if zero return zero for *int and mantissa
BREQ _modf_200
CPI rA3,0x7F ; Exp < 0x7F -> arg < 1.0 -> no integer part
BRCS _modf_200 ;
_modf_100:
MOV rTI0,rA3 ; keep temporarily
RCALL _U(__fp_merge) ; rT0 must not be cleared : rAE=0 no rounding anyway
MOV rB3,rA3
MOV rB2,rA2
MOV rB1,rA1
MOV rB0,rA0
CPI rTI0,0x96 ; rA3 >= 0x96 -> no fractional part
BRCC _modf_150 ;
RCALL _U(__fixsfsi) ;
RCALL _U(__floatsisf) ;
CPI YL,0
CPC YL,YH
BREQ _modf_130
ST Y+,rA0
ST Y+,rA1
ST Y+,rA2
ST Y+,rA3 ; A = integer part
_modf_130:
SUBI rA3,0x80 ; A = -int(x)
POP YH
POP YL
RJMP _U(__addsf3)
_modf_150:
CLR rA3
CLR rA2
CLR rA1
CLR rA0
_modf_200:
CPI YL,0
CPC YL,YH
BREQ _modf_250
ST Y+,rB0
ST Y+,rB1
ST Y+,rB2
ST Y+,rB3 ; no fractional part
_modf_250:
POP YH
POP YL
RJMP _U(__fp_merge) ; rT0 must not be cleared : rAE=0 no rounding anyway
ENDFUNC
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