From ccdbf41be60f78df9f8f2347026aaaf03693bd35 Mon Sep 17 00:00:00 2001 From: Clifford Wolf Date: Sat, 31 Oct 2015 13:39:30 +0100 Subject: Improvements in wreduce --- passes/opt/wreduce.cc | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'passes') diff --git a/passes/opt/wreduce.cc b/passes/opt/wreduce.cc index df416e4c5..4f08da675 100644 --- a/passes/opt/wreduce.cc +++ b/passes/opt/wreduce.cc @@ -201,6 +201,31 @@ struct WreduceWorker if (max_port_b_size >= 0) run_reduce_inport(cell, 'B', max_port_b_size, port_b_signed, did_something); + if (cell->hasPort("\\A") && cell->hasPort("\\B") && port_a_signed && port_b_signed) { + SigSpec sig_a = mi.sigmap(cell->getPort("\\A")), sig_b = mi.sigmap(cell->getPort("\\B")); + if (GetSize(sig_a) > 0 && sig_a[GetSize(sig_a)-1] == State::S0 && + GetSize(sig_b) > 0 && sig_b[GetSize(sig_b)-1] == State::S0) { + log("Converting cell %s.%s (%s) from signed to unsigned.\n", + log_id(module), log_id(cell), log_id(cell->type)); + cell->setParam("\\A_SIGNED", 0); + cell->setParam("\\B_SIGNED", 0); + port_a_signed = false; + port_b_signed = false; + did_something = true; + } + } + + if (cell->hasPort("\\A") && !cell->hasPort("\\B") && port_a_signed) { + SigSpec sig_a = mi.sigmap(cell->getPort("\\A")); + if (GetSize(sig_a) > 0 && sig_a[GetSize(sig_a)-1] == State::S0) { + log("Converting cell %s.%s (%s) from signed to unsigned.\n", + log_id(module), log_id(cell), log_id(cell->type)); + cell->setParam("\\A_SIGNED", 0); + port_a_signed = false; + did_something = true; + } + } + // Reduce size of port Y based on sizes for A and B and unused bits in Y -- cgit v1.2.3