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Fixed bug where counter extraction on non-GreenPAK devices incorrectly handled parallel counter output

This commit is contained in:
Andrew Zonenberg 2017-09-14 10:18:49 -07:00
parent c8f2f082c6
commit 367d6b2194
1 changed files with 27 additions and 32 deletions
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29
passes/techmap/extract_counter.cc
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@ -280,9 +280,6 @@ int counter_tryextract(
if(extract.has_ce)
max_loads = 3;
if(cnout_loads.size() > max_loads)
{
//If we specified a limited set of cells for parallel output, check that we only drive them
if(!parallel_cells.empty())
{
for(auto c : cnout_loads)
{
@ -293,13 +290,16 @@ int counter_tryextract(
if(c == muxload)
continue;
//If we specified a limited set of cells for parallel output, check that we only drive them
if(!parallel_cells.empty())
{
//Make sure we're in the whitelist
if( parallel_cells.find(c->type) == parallel_cells.end())
return 17;
}
//Figure out what port(s) are driven by it
//TODO: this can probably be done more efficiently w/o multiple iterations over our whole net?
RTLIL::IdString portname;
for(auto b : qport)
{
pool<ModIndex::PortInfo> ports = index.query_ports(b);
@ -307,19 +307,9 @@ int counter_tryextract(
{
if(x.cell != c)
continue;
if(portname == "")
portname = x.port;
//somehow our counter output is going to multiple ports
//this makes no sense, don't allow inference
else if(portname != x.port)
return 17;
extract.pouts.insert(ModIndex::PortInfo(c, x.port, 0));
}
}
//Save the other loads
extract.pouts.insert(ModIndex::PortInfo(c, portname, 0));
}
}
}
if(!is_full_bus(cnout, index, count_reg, "\\Q", underflow_inv, "\\A", true))
@ -529,10 +519,15 @@ void counter_worker(
string reset_type = "non-resettable";
if(extract.has_reset)
{
if(extract.rst_inverted)
reset_type = "negative";
else
reset_type = "positive";
//TODO: support other kind of reset
reset_type = "async resettable";
reset_type += " async resettable";
}
log(" Found %d-bit %s down counter %s (counting from %d) for register %s declared at %s\n",
log(" Found %d-bit (%s) down counter %s (counting from %d) for register %s, declared at %s\n",
extract.width,
reset_type.c_str(),
countname.c_str(),