1/*
2 * Copyright (C) 2004-2010 NXP Software
3 * Copyright (C) 2010 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include "LVM_Types.h"
19#include "LVM_Macros.h"
20#include "ScalarArithmetic.h"
21#include "Filter.h"
22
23
24/*-------------------------------------------------------------------------*/
25/* FUNCTION:                                                               */
26/*   LVM_Power10                                                           */
27/*                                                                         */
28/* DESCRIPTION:                                                            */
29/*   This function calculates 10X using an 11th order polynomial. It uses  */
30/*   the following table of 32-bit integer polynomial coefficients:        */
31/*                                                                         */
32/*   Coefficient    Value                                                  */
33/*   A0             67102543                                               */
34/*   A1             309032995                                              */
35/*   A2             712096127                                              */
36/*   A3             1092797331                                             */
37/*   A4             1251625137                                             */
38/*   A5             1154649460                                             */
39/*   A6             915654800                                              */
40/*   A7             597883683                                              */
41/*   A8             284378230                                              */
42/*   A9             150262097                                              */
43/*   A10            124894471                                              */
44/*   A11            50477244                                               */
45/*   A12            -2                                                     */
46/*                                                                         */
47/*  Y = (A0 + A1*X + A2*X2 + A3*X3 + �.. + AN*xN) << AN+1                  */
48/*                                                                         */
49/*                                                                         */
50/* PARAMETERS:                                                             */
51/*                                                                         */
52/*  X               is the input variable in Q2.30 format                  */
53/*                                                                         */
54/* RETURNS:                                                                */
55/*   The result of the 10x expansion in Q8.24 format                       */
56/*-------------------------------------------------------------------------*/
57
58LVM_INT32 LVM_Power10(LVM_INT32     X)
59{
60    LVM_INT32 Y,Coefficients[13]={  16775636,
61                                        77258249,
62                                       178024032,
63                                       273199333,
64                                       312906284,
65                                       288662365,
66                                       228913700,
67                                       149470921,
68                                        71094558,
69                                        37565524,
70                                        31223618,
71                                        12619311,
72                                     0};
73    Y=LVM_Polynomial((LVM_UINT16)11,
74                        Coefficients,
75                        X);
76    return Y;
77}
78
79