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Add real comparisons in continuous assignments.
This patch adds real comparisons in continuous assignments. It also converts bit based constants to real values when needed by the comparisons.
This commit is contained in:
Cary R
Stephen Williams
+33
-99
@@ -1,5 +1,5 @@
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/*
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* Copyright (c) 1998-2000 Stephen Williams ([email protected])
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* Copyright (c) 1998-2008 Stephen Williams ([email protected])
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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@@ -16,15 +16,15 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CVS_IDENT
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#ident "$Id: verinum.cc,v 1.52 2007/02/25 23:08:24 steve Exp $"
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#endif
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# include "config.h"
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# include "verinum.h"
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# include <iostream>
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# include <cassert>
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# include <math.h> // Needed to get pow for as_double().
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static verinum::V add_with_carry(verinum::V l, verinum::V r, verinum::V&c);
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verinum::verinum()
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: bits_(0), nbits_(0), has_len_(false), has_sign_(false), string_flag_(false)
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@@ -332,6 +332,35 @@ signed long verinum::as_long() const
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return val;
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}
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double verinum::as_double() const
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{
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if (nbits_ == 0) return 0.0;
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/* Do we have a signed value? */
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bool signed_flag = false;
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if (bits_[nbits_-1] == V1) {
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signed_flag = true;
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}
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double val = 0.0;
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if (signed_flag) {
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V carry = V1;
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for (unsigned idx = 0; idx < nbits_; idx += 1) {
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V sum = add_with_carry(~bits_[idx], V0, carry);
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if (sum == V1)
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val += pow(2.0, (double)idx);
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}
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val *= -1.0;
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// val = (double) as_long();
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} else {
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for (unsigned idx = 0; idx < nbits_; idx += 1) {
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if (bits_[idx] == V1)
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val += pow(2.0, (double)idx);
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}
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}
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return val;
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}
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string verinum::as_string() const
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{
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assert( nbits_%8 == 0 );
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@@ -1158,98 +1187,3 @@ verinum::V operator ^ (verinum::V l, verinum::V r)
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return verinum::Vx;
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}
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/*
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* $Log: verinum.cc,v $
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* Revision 1.52 2007/02/25 23:08:24 steve
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* Process Verilog escape sequences much earlier.
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*
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* Revision 1.51 2007/01/27 05:36:11 steve
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* Fix padding of x when literal is sized and unsigned.
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*
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* Revision 1.50 2007/01/19 05:42:04 steve
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* Fix calculation of verinum pow operation.
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*
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* Revision 1.49 2006/12/08 19:56:09 steve
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* Handle very wide signed divide.
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*
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* Revision 1.48 2006/08/08 05:11:37 steve
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* Handle 64bit delay constants.
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*
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* Revision 1.47 2006/07/31 03:50:17 steve
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* Add support for power in constant expressions.
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*
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* Revision 1.46 2006/06/02 04:48:50 steve
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* Make elaborate_expr methods aware of the width that the context
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* requires of it. In the process, fix sizing of the width of unary
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* minus is context determined sizes.
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*
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* Revision 1.45 2006/06/01 03:54:51 steve
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* Fix broken subtraction of small constants.
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*
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* Revision 1.44 2005/12/07 04:04:24 steve
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* Allow constant concat expressions.
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*
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* Revision 1.43 2004/05/18 18:43:15 steve
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* Handle null string as a single nul character.
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*
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* Revision 1.42 2004/02/17 06:52:55 steve
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* Support unsigned divide of huge numbers.
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*
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* Revision 1.41 2003/10/26 04:54:56 steve
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* Support constant evaluation of binary ^ operator.
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*
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* Revision 1.40 2003/05/25 03:01:19 steve
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* Get length of trimed unsigned value right.
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*
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* Revision 1.39 2003/04/14 03:40:21 steve
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* Make some effort to preserve bits while
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* operating on constant values.
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*
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* Revision 1.38 2003/04/03 04:30:00 steve
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* Prevent overrun comparing verinums to zero.
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*
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* Revision 1.37 2003/02/02 00:43:16 steve
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* Fix conversion of signed numbes to long
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*
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* Revision 1.36 2003/01/30 16:23:08 steve
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* Spelling fixes.
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*
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* Revision 1.35 2002/08/19 02:39:17 steve
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* Support parameters with defined ranges.
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*
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* Revision 1.34 2002/08/12 01:35:01 steve
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* conditional ident string using autoconfig.
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*
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* Revision 1.33 2002/04/27 23:26:24 steve
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* Trim leading nulls from string forms.
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*
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* Revision 1.32 2002/04/27 04:48:43 steve
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* Display string verinums as strings.
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*
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* Revision 1.31 2002/02/01 05:09:14 steve
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* Propagate sign in unary minus.
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*
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* Revision 1.30 2001/12/31 00:02:33 steve
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* Include s indicator in dump of signed numbers.
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*
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* Revision 1.29 2001/11/19 02:54:12 steve
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* Handle division and modulus by zero while
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* evaluating run-time constants.
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*
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* Revision 1.28 2001/11/06 06:11:55 steve
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* Support more real arithmetic in delay constants.
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*
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* Revision 1.27 2001/07/25 03:10:50 steve
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* Create a config.h.in file to hold all the config
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* junk, and support gcc 3.0. (Stephan Boettcher)
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*
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* Revision 1.26 2001/02/09 05:44:23 steve
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* support evaluation of constant < in expressions.
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*
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* Revision 1.25 2001/02/08 05:38:18 steve
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* trim the length of unsized numbers.
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*
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* Revision 1.24 2001/02/07 21:47:13 steve
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* Fix expression widths for rvalues and parameters (PR#131,132)
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*/
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