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Diffstat (limited to 'src/systemc/dt/fx/scfx_utils.cc')
| -rw-r--r-- | src/systemc/dt/fx/scfx_utils.cc | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/src/systemc/dt/fx/scfx_utils.cc b/src/systemc/dt/fx/scfx_utils.cc new file mode 100644 index 000000000..844e15df6 --- /dev/null +++ b/src/systemc/dt/fx/scfx_utils.cc @@ -0,0 +1,162 @@ +/***************************************************************************** + + 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 "systemc/ext/dt/fx/scfx_utils.hh" + +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 { + 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 |