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Fix for pr3452808. 

The tran island rework included an optimisation that meant that an
island port would only be resolved once the initial value for the net
attached to that port had propagated to the port. However, v0.9 does
not propagate initial values in some cases, so this optimisation
cannot be used.
This commit is contained in:
Martin Whitaker 2011-12-09 22:24:20 +00:00 committed by Cary R
parent 0fa7764eac
commit c96619527a
1 changed files with 17 additions and 2 deletions
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19
vvp/island_tran.cc
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@ -152,9 +152,24 @@ static void push_value_through_branch(const vvp_vector8_t&val,
if (dst_port->value.size() == 0)
dst_port->value = island_get_value(dst_net);
// If we don't yet have an initial value for the port, skip.
if (dst_port->value.size() == 0)
// If we don't yet have an initial value for this port, simply
// derive the port value from the pushed value. This does not
// need to be pushed back into the network.
if (dst_port->value.size() == 0) {
if (branch->width == 0) {
// There are no part selects.
dst_port->value = val;
} else if (dst_ab == 1) {
// The other side is a strict subset (part select)
// of this side.
dst_port->value = val.subvalue(branch->offset, branch->part);
} else {
// The other side is a superset of this side.
dst_port->value = part_expand(val, branch->width,
branch->offset);
}
return;
}
// Now resolve the pushed value with whatever values we have
// previously collected (and resolved) for the port.