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Evaluate constant unary minus.

This commit is contained in:
steve 2001-12-30 00:39:25 +00:00
parent 5de8e0555c
commit b397b10104
1 changed files with 21 additions and 1 deletions
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22
eval_tree.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: eval_tree.cc,v 1.30 2001/12/03 04:47:15 steve Exp $"
#ident "$Id: eval_tree.cc,v 1.31 2001/12/30 00:39:25 steve Exp $"
#endif
# include "config.h"
@ -911,6 +911,23 @@ NetEConst* NetEUnary::eval_tree()
switch (op_) {
case '+':
/* Unary + is a no-op. */
return new NetEConst(val);
case '-': {
if (val.is_defined()) {
verinum tmp (verinum::V0, val.len());
val = tmp - val;
} else {
for (unsigned idx = 0 ; idx < val.len() ; idx += 1)
val.set(idx, verinum::Vx);
}
return new NetEConst(val);
}
case '~': {
/* Bitwise not is even simpler then logical
@ -1002,6 +1019,9 @@ NetEConst* NetEUReduce::eval_tree()
/*
* $Log: eval_tree.cc,v $
* Revision 1.31 2001/12/30 00:39:25 steve
* Evaluate constant unary minus.
*
* Revision 1.30 2001/12/03 04:47:15 steve
* Parser and pform use hierarchical names as hname_t
* objects instead of encoded strings.