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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_powser.S 2191 2010-11-05 13:45:57Z arcanum $ */
#if !defined(__AVR_TINY__)
#include "fp32def.h"
#include "asmdef.h"
/* flt40_t __fp_powser (float x, ZH.ZL);
The __fp_powser() function calculates the polynom.
Input:
rA3.rA2.rA1.rA0 - an 'x' arg
ZH.ZL - table address (in low 64K flash memory)
Output:
rA3.rA2.rA1.rA0.rAE - result (is't rounded)
Table format:
; example for 3 power: C0 + x*(C1 + x*(C2 + x*C3))
; all floats are little-endian
.byte 3 ; polynom power
.byte C3,C3,C3,C3 ; flt32_t C3
.byte C2,C2,C2,C2,C2 ; flt40_t C2
.byte C1,C1,C1,C1,C1 ; flt40_t C1
.byte C0,C0,C0,C0,C0 ; flt40_t C0
*/
#define rC3 r17
#define rC2 r16
#define rC1 r15
#define rC0 r14
#define rcntr r13
ENTRY __fp_powser
push YH
push YL
push rC3
push rC2
push rC1
push rC0
push rcntr
X_movw rC0, rA0
X_movw rC2, rA2
set ; as flag to return
rjmp .Load5
1: mov rcntr, rBE
.Loop: X_movw YL, ZL
rcall _U(__mulsf3x)
X_movw ZL, YL
clt
.Load5:
X_lpm rBE, Z+
X_lpm rB0, Z+
X_lpm rB1, Z+
X_lpm rB2, Z+
X_lpm rB3, Z+
brts 1b
X_movw YL, ZL
rcall _U(__addsf3x)
X_movw ZL, YL
X_movw rB0, rC0
X_movw rB2, rC2
dec rcntr
brne .Loop
pop rcntr
pop rC0
pop rC1
pop rC2
pop rC3
pop YL
pop YH
ret
ENDFUNC
#endif /* !defined(__AVR_TINY__) */
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