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Fixed handling of driver-driver conflicts in wreduce

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This commit is contained in:
Clifford Wolf 2015-10-24 13:44:35 +02:00
parent 4cec1c058d
commit 2a0f577f83
3 changed files with 42 additions and 9 deletions
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24
passes/opt/wreduce.cc
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@ -66,6 +66,9 @@ struct WreduceWorker
SigSpec sig_y = mi.sigmap(cell->getPort("\\Y"));
std::vector<SigBit> bits_removed;
if (sig_y.has_const())
return;
for (int i = GetSize(sig_y)-1; i >= 0; i--)
{
auto info = mi.query(sig_y[i]);
@ -173,6 +176,11 @@ struct WreduceWorker
if (cell->type.in("$mux", "$pmux"))
return run_cell_mux(cell);
SigSpec sig = mi.sigmap(cell->getPort("\\Y"));
if (sig.has_const())
return;
// Reduce size of ports A and B based on constant input bits and size of output port
@ -180,8 +188,8 @@ struct WreduceWorker
int max_port_b_size = cell->hasPort("\\B") ? GetSize(cell->getPort("\\B")) : -1;
if (cell->type.in("$not", "$pos", "$neg", "$and", "$or", "$xor", "$add", "$sub")) {
max_port_a_size = std::min(max_port_a_size, GetSize(cell->getPort("\\Y")));
max_port_b_size = std::min(max_port_b_size, GetSize(cell->getPort("\\Y")));
max_port_a_size = std::min(max_port_a_size, GetSize(sig));
max_port_b_size = std::min(max_port_b_size, GetSize(sig));
}
bool port_a_signed = false;
@ -196,8 +204,6 @@ struct WreduceWorker
// Reduce size of port Y based on sizes for A and B and unused bits in Y
SigSpec sig = mi.sigmap(cell->getPort("\\Y"));
int bits_removed = 0;
if (port_a_signed && cell->type == "$shr") {
// do not reduce size of output on $shr cells with signed A inputs
@ -358,10 +364,12 @@ struct WreducePass : public Pass {
"$lt", "$le", "$eq", "$ne", "$eqx", "$nex", "$ge", "$gt",
"$logic_not", "$logic_and", "$logic_or") && GetSize(c->getPort("\\Y")) > 1) {
SigSpec sig = c->getPort("\\Y");
c->setPort("\\Y", sig[0]);
c->setParam("\\Y_WIDTH", 1);
sig.remove(0);
module->connect(sig, Const(0, GetSize(sig)));
if (!sig.has_const()) {
c->setPort("\\Y", sig[0]);
c->setParam("\\Y_WIDTH", 1);
sig.remove(0);
module->connect(sig, Const(0, GetSize(sig)));
}
}
WreduceWorker worker(&config, module);