| /***************************************************************************** |
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| Licensed to Accellera Systems Initiative Inc. (Accellera) under one or |
| more contributor license agreements. See the NOTICE file distributed |
| with this work for additional information regarding copyright ownership. |
| Accellera licenses this file to you 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 |
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| 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. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| scfx_utils.cpp - |
| |
| Original Author: Martin Janssen, Synopsys, Inc. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| MODIFICATION LOG - modifiers, enter your name, affiliation, date and |
| changes you are making here. |
| |
| Name, Affiliation, Date: |
| Description of Modification: |
| |
| *****************************************************************************/ |
| |
| |
| // $Log: scfx_utils.cpp,v $ |
| // Revision 1.1.1.1 2006/12/15 20:20:04 acg |
| // SystemC 2.3 |
| // |
| // Revision 1.3 2006/01/13 18:53:58 acg |
| // Andy Goodrich: added $Log command so that CVS comments are reproduced in |
| // the source. |
| // |
| |
| #include "sysc/datatypes/fx/scfx_utils.h" |
| |
| |
| namespace sc_dt |
| { |
| |
| void |
| scfx_tc2csd( scfx_string& s, int w_prefix ) |
| { |
| if( w_prefix != 0 ) { |
| SC_ASSERT_( s[0] == '0' && s[1] == 'c' && |
| s[2] == 's' && s[3] == 'd', "invalid prefix" ); |
| } |
| |
| scfx_string csd; |
| |
| // copy bits from 's' into 'csd'; skip prefix, point, and exponent |
| int i = 0; |
| int j = (w_prefix != 0 ? 4 : 0); |
| while( s[j] ) |
| { |
| if( s[j] == '0' || s[j] == '1' ) |
| csd[i ++] = s[j]; |
| else if( s[j] != '.' ) |
| break; |
| ++ j; |
| } |
| csd[i] = '\0'; |
| |
| // convert 'csd' from two's complement to csd |
| -- i; |
| while( i >= 0 ) |
| { |
| if( csd[i] == '0' ) |
| -- i; |
| else |
| { |
| if( i > 0 && csd[i - 1] == '0' ) |
| -- i; |
| else if( i == 0 ) |
| csd[i --] = '-'; |
| else |
| { // i > 0 && csd[i - 1] == '1' |
| csd[i --] = '-'; |
| while( i >= 0 && csd[i] == '1' ) |
| csd[i --] = '0'; |
| if( i > 0 ) |
| csd[i] = '1'; |
| else if( i == 0 ) |
| csd[i --] = '1'; |
| } |
| } |
| } |
| |
| // copy bits from 'csd' back into 's' |
| i = 0; |
| j = (w_prefix != 0 ? 4 : 0); |
| while( csd[i] ) |
| { |
| if( s[j] == '.' ) |
| ++ j; |
| s[j ++] = csd[i ++]; |
| } |
| } |
| |
| |
| void |
| scfx_csd2tc( scfx_string& csd ) |
| { |
| SC_ASSERT_( csd[0] == '0' && csd[1] == 'c' && |
| csd[2] == 's' && csd[3] == 'd', "invalid prefix" ); |
| |
| scfx_string s; |
| |
| // copy bits from 'csd' into 's'; skip prefix, point, and exponent |
| int i = 0; |
| s[i ++] = '0'; |
| int j = 4; |
| while( csd[j] ) |
| { |
| if( csd[j] == '-' || csd[j] == '0' || csd[j] == '1' ) |
| s[i ++] = csd[j]; |
| else if( csd[j] != '.' ) |
| break; |
| ++ j; |
| } |
| s[i] = '\0'; |
| |
| // convert 's' from csd to two's complement |
| int len = i; |
| i = 1; |
| while( i < len ) |
| { |
| while( i < len && s[i] != '-' ) |
| i ++; |
| if( i < len ) |
| { |
| j = i ++; |
| s[j --] = '1'; |
| while( j >= 0 && s[j] == '0' ) |
| s[j --] = '1'; |
| if( j >= 0 ) |
| s[j] = '0'; |
| } |
| } |
| |
| // copy bits from 's' back into 'csd' |
| j = csd.length(); |
| csd[j + 1] = '\0'; |
| while( j > 4 ) |
| { |
| csd[j] = csd[j - 1]; |
| -- j; |
| } |
| |
| i = 0; |
| j = 4; |
| while( s[i] ) |
| { |
| if( csd[j] == '.' ) |
| ++ j; |
| csd[j ++] = s[i ++]; |
| } |
| } |
| |
| } // namespace sc_dt |
| |
| |
| // Taf! |