| /* |
| * Copyright (C) 2004-2010 NXP Software |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "LVM_Types.h" |
| #include "LVM_Macros.h" |
| #include "ScalarArithmetic.h" |
| #include "Filter.h" |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| /* FUNCTION: */ |
| /* LVM_Power10 */ |
| /* */ |
| /* DESCRIPTION: */ |
| /* This function calculates 10X using an 11th order polynomial. It uses */ |
| /* the following table of 32-bit integer polynomial coefficients: */ |
| /* */ |
| /* Coefficient Value */ |
| /* A0 67102543 */ |
| /* A1 309032995 */ |
| /* A2 712096127 */ |
| /* A3 1092797331 */ |
| /* A4 1251625137 */ |
| /* A5 1154649460 */ |
| /* A6 915654800 */ |
| /* A7 597883683 */ |
| /* A8 284378230 */ |
| /* A9 150262097 */ |
| /* A10 124894471 */ |
| /* A11 50477244 */ |
| /* A12 -2 */ |
| /* */ |
| /* Y = (A0 + A1*X + A2*X2 + A3*X3 + �.. + AN*xN) << AN+1 */ |
| /* */ |
| /* */ |
| /* PARAMETERS: */ |
| /* */ |
| /* X is the input variable in Q2.30 format */ |
| /* */ |
| /* RETURNS: */ |
| /* The result of the 10x expansion in Q8.24 format */ |
| /*-------------------------------------------------------------------------*/ |
| #ifdef BUILD_FLOAT |
| LVM_FLOAT LVM_Power10(LVM_FLOAT X) |
| { |
| LVM_FLOAT Y,Coefficients[13]={0.999906f, |
| 2.302475f, |
| 2.652765f, |
| 2.035494f, |
| 1.165667f, |
| 0.537676f, |
| 0.213192f, |
| 0.069603f, |
| 0.016553f, |
| 0.004373f, |
| 0.001817f, |
| 0.000367f, |
| 0}; |
| Y=LVM_Polynomial((LVM_UINT16)11, |
| Coefficients, |
| X); |
| return Y; |
| } |
| #else |
| LVM_INT32 LVM_Power10(LVM_INT32 X) |
| { |
| LVM_INT32 Y,Coefficients[13]={ 16775636, |
| 77258249, |
| 178024032, |
| 273199333, |
| 312906284, |
| 288662365, |
| 228913700, |
| 149470921, |
| 71094558, |
| 37565524, |
| 31223618, |
| 12619311, |
| 0}; |
| Y=LVM_Polynomial((LVM_UINT16)11, |
| Coefficients, |
| X); |
| return Y; |
| } |
| #endif |
