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Diffstat (limited to 'ext/systemc/src/sysc/datatypes/fx/scfx_utils.cpp')
| -rw-r--r-- | ext/systemc/src/sysc/datatypes/fx/scfx_utils.cpp | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/ext/systemc/src/sysc/datatypes/fx/scfx_utils.cpp b/ext/systemc/src/sysc/datatypes/fx/scfx_utils.cpp new file mode 100644 index 000000000..0735a6c25 --- /dev/null +++ b/ext/systemc/src/sysc/datatypes/fx/scfx_utils.cpp @@ -0,0 +1,176 @@ +/***************************************************************************** + + 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 + + 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! |