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 #ifdef BUILD_FLOAT 58 LVM_FLOAT LVM_Power10(LVM_FLOAT X) 59 { 60 LVM_FLOAT Y,Coefficients[13]={0.999906f, 61 2.302475f, 62 2.652765f, 63 2.035494f, 64 1.165667f, 65 0.537676f, 66 0.213192f, 67 0.069603f, 68 0.016553f, 69 0.004373f, 70 0.001817f, 71 0.000367f, 72 0}; 73 Y=LVM_Polynomial((LVM_UINT16)11, 74 Coefficients, 75 X); 76 return Y; 77 } 78 #else 79 LVM_INT32 LVM_Power10(LVM_INT32 X) 80 { 81 LVM_INT32 Y,Coefficients[13]={ 16775636, 82 77258249, 83 178024032, 84 273199333, 85 312906284, 86 288662365, 87 228913700, 88 149470921, 89 71094558, 90 37565524, 91 31223618, 92 12619311, 93 0}; 94 Y=LVM_Polynomial((LVM_UINT16)11, 95 Coefficients, 96 X); 97 return Y; 98 } 99 #endif 100
