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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.
*/
/*
pow.S is part of FPlib V 0.3.0 ported to avr-as
for details see readme.fplib
*----------------------------------------------------------------------------------------
*
*
* A = pow(x,y) = exp( log(x)*y ) | x > 0
*/
#include "gasava.inc"
#include "fplib.inc"
TEXT_SEG(fplib, pow)
FUNCTION(pow)
GLOBAL(pow)
TST rB3
BREQ 10f ; x ^ 0 = 1.0
TST rA3
BRMI 1f
BREQ 10f
PUSH rB3
PUSH rB2
PUSH rB1
PUSH rB0
RCALL _U(log)
POP rB0
POP rB1
POP rB2
POP rB3
RCALL _U(__mulsf3)
RJMP _U(exp)
1:
/* x < 0 -> no rational power allowed
* check if B is an integer number
* if yes then pow(x,y) =
*/
PUSH rA3
PUSH rA2
PUSH rA1
PUSH rA0
PUSH rB3
PUSH rB2
PUSH rB1
PUSH rB0
MOV rA3,rB3
MOV rA2,rB2
MOV rA1,rB1
MOV rA0,rB0
RCALL _U(__fixsfsi)
RCALL _U(__subsf3)
CP rA3,rT1c
CPC rA2,rT1c
CPC rA1,rT1c
CPC rA0,rT1c
POP rB0
POP rB1
POP rB2
POP rB3
POP rA0
POP rA1
POP rA2
POP rA3
BREQ 2f
ANDI rA3,0x7F
SUBI rB3,0x80
RCALL 1b
SUBI rB3,0x80
2:
RJMP _U(__fp_nanEDOM)
10:
LDI rA3,0x3F
LDI rA2,0x80
CLR rA1
CLR rA0
RET
ENDFUNC
|
