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Handle real-valued unary subtract. 

the sub_net_from function is used by the ::synthesize method of the
NetEUnary class to make the expression 0-N. By making that function
handle a real-valued net, the NetEUnary suddenly supports real-valued
nets, and this probably helps in other places as well.
This commit is contained in:
Stephen Williams 2008-08-23 18:11:11 -07:00
parent 65c3bc91de
commit 0341679360
1 changed files with 15 additions and 5 deletions
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20
netmisc.cc
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@ -78,16 +78,26 @@ NetNet* add_to_net(Design*des, NetNet*sig, long val)
NetNet* sub_net_from(Design*des, NetScope*scope, long val, NetNet*sig)
{
verinum zero ((uint64_t)0, sig->vector_width());
NetConst*zero_obj = new NetConst(scope, scope->local_symbol(), zero);
des->add_node(zero_obj);
NetNet*zero_net = new NetNet(scope, scope->local_symbol(),
NetNet::WIRE, sig->vector_width());
zero_net->data_type(sig->data_type());
zero_net->local_flag(true);
connect(zero_net->pin(0), zero_obj->pin(0));
if (sig->data_type() == IVL_VT_REAL) {
verireal zero (val);
NetLiteral*zero_obj = new NetLiteral(scope, scope->local_symbol(), zero);
des->add_node(zero_obj);
connect(zero_net->pin(0), zero_obj->pin(0));
} else {
verinum zero ((int64_t)val);
zero = pad_to_width(zero, sig->vector_width());
NetConst*zero_obj = new NetConst(scope, scope->local_symbol(), zero);
des->add_node(zero_obj);
connect(zero_net->pin(0), zero_obj->pin(0));
}
NetAddSub*adder = new NetAddSub(scope, scope->local_symbol(), sig->vector_width());
des->add_node(adder);