1/***************************************************************************** 2 3 Licensed to Accellera Systems Initiative Inc. (Accellera) under one or 4 more contributor license agreements. See the NOTICE file distributed 5 with this work for additional information regarding copyright ownership. 6 Accellera licenses this file to you under the Apache License, Version 2.0 7 (the "License"); you may not use this file except in compliance with the 8 License. You may obtain a copy of the License at 9 10 http://www.apache.org/licenses/LICENSE-2.0 11 12 Unless required by applicable law or agreed to in writing, software 13 distributed under the License is distributed on an "AS IS" BASIS, 14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 15 implied. See the License for the specific language governing 16 permissions and limitations under the License. 17 18 *****************************************************************************/ 19 20/***************************************************************************** 21 22 scfx_utils.cpp - 23 24 Original Author: Martin Janssen, Synopsys, Inc. 25 26 *****************************************************************************/ 27 28/***************************************************************************** 29 30 MODIFICATION LOG - modifiers, enter your name, affiliation, date and 31 changes you are making here. 32 33 Name, Affiliation, Date: 34 Description of Modification: 35 36 *****************************************************************************/ 37 38 39// $Log: scfx_utils.cpp,v $ 40// Revision 1.1.1.1 2006/12/15 20:20:04 acg 41// SystemC 2.3 42// 43// Revision 1.3 2006/01/13 18:53:58 acg 44// Andy Goodrich: added $Log command so that CVS comments are reproduced in 45// the source. 46// 47 48#include "sysc/datatypes/fx/scfx_utils.h" 49 50 51namespace sc_dt 52{ 53 54void 55scfx_tc2csd( scfx_string& s, int w_prefix ) 56{ 57 if( w_prefix != 0 ) { 58 SC_ASSERT_( s[0] == '0' && s[1] == 'c' && 59 s[2] == 's' && s[3] == 'd', "invalid prefix" ); 60 } 61 62 scfx_string csd; 63 64 // copy bits from 's' into 'csd'; skip prefix, point, and exponent 65 int i = 0; 66 int j = (w_prefix != 0 ? 4 : 0); 67 while( s[j] ) 68 { 69 if( s[j] == '0' || s[j] == '1' ) 70 csd[i ++] = s[j]; 71 else if( s[j] != '.' ) 72 break; 73 ++ j; 74 } 75 csd[i] = '\0'; 76 77 // convert 'csd' from two's complement to csd 78 -- i; 79 while( i >= 0 ) 80 { 81 if( csd[i] == '0' ) 82 -- i; 83 else 84 { 85 if( i > 0 && csd[i - 1] == '0' ) 86 -- i; 87 else if( i == 0 ) 88 csd[i --] = '-'; 89 else 90 { // i > 0 && csd[i - 1] == '1' 91 csd[i --] = '-'; 92 while( i >= 0 && csd[i] == '1' ) 93 csd[i --] = '0'; 94 if( i > 0 ) 95 csd[i] = '1'; 96 else if( i == 0 ) 97 csd[i --] = '1'; 98 } 99 } 100 } 101 102 // copy bits from 'csd' back into 's' 103 i = 0; 104 j = (w_prefix != 0 ? 4 : 0); 105 while( csd[i] ) 106 { 107 if( s[j] == '.' ) 108 ++ j; 109 s[j ++] = csd[i ++]; 110 } 111} 112 113 114void 115scfx_csd2tc( scfx_string& csd ) 116{ 117 SC_ASSERT_( csd[0] == '0' && csd[1] == 'c' && 118 csd[2] == 's' && csd[3] == 'd', "invalid prefix" ); 119 120 scfx_string s; 121 122 // copy bits from 'csd' into 's'; skip prefix, point, and exponent 123 int i = 0; 124 s[i ++] = '0'; 125 int j = 4; 126 while( csd[j] ) 127 { 128 if( csd[j] == '-' || csd[j] == '0' || csd[j] == '1' ) 129 s[i ++] = csd[j]; 130 else if( csd[j] != '.' ) 131 break; 132 ++ j; 133 } 134 s[i] = '\0'; 135 136 // convert 's' from csd to two's complement 137 int len = i; 138 i = 1; 139 while( i < len ) 140 { 141 while( i < len && s[i] != '-' ) 142 i ++; 143 if( i < len ) 144 { 145 j = i ++; 146 s[j --] = '1'; 147 while( j >= 0 && s[j] == '0' ) 148 s[j --] = '1'; 149 if( j >= 0 ) 150 s[j] = '0'; 151 } 152 } 153 154 // copy bits from 's' back into 'csd' 155 j = csd.length(); 156 csd[j + 1] = '\0'; 157 while( j > 4 ) 158 { 159 csd[j] = csd[j - 1]; 160 -- j; 161 } 162 163 i = 0; 164 j = 4; 165 while( s[i] ) 166 { 167 if( csd[j] == '.' ) 168 ++ j; 169 csd[j ++] = s[i ++]; 170 } 171} 172 173} // namespace sc_dt 174 175 176// Taf! 177