From 747690a6df9e51b4065003b50b0f07042712f112 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Thu, 8 Aug 2019 16:33:37 -0700
Subject: [PATCH] Remove muxY and ffY for now

---
 passes/pmgen/xilinx_dsp.cc  | 10 +++----
 passes/pmgen/xilinx_dsp.pmg | 58 ++++++++++++++++++-------------------
 2 files changed, 33 insertions(+), 35 deletions(-)

diff --git a/passes/pmgen/xilinx_dsp.cc b/passes/pmgen/xilinx_dsp.cc
index 74bcbf451..389f0cb56 100644
--- a/passes/pmgen/xilinx_dsp.cc
+++ b/passes/pmgen/xilinx_dsp.cc
@@ -38,7 +38,7 @@ void pack_xilinx_dsp(xilinx_dsp_pm &pm)
 	log("ffB:   %s\n", log_id(st.ffB, "--"));
 	log("dsp:   %s\n", log_id(st.dsp, "--"));
 	log("ffP:   %s\n", log_id(st.ffP, "--"));
-	log("muxP:  %s\n", log_id(st.muxP, "--"));
+	//log("muxP:  %s\n", log_id(st.muxP, "--"));
 	log("sigPused: %s\n", log_signal(st.sigPused));
 	log_module(pm.module);
 #endif
@@ -81,9 +81,9 @@ void pack_xilinx_dsp(xilinx_dsp_pm &pm)
 		if (st.ffP) {
 			SigSpec P = cell->getPort("\\P");
 			SigSpec D;
-			if (st.muxP)
-				D = st.muxP->getPort("\\B");
-			else
+			//if (st.muxP)
+			//	D = st.muxP->getPort("\\B");
+			//else
 				D = st.ffP->getPort("\\D");
 			SigSpec Q = st.ffP->getPort("\\Q");
 			P.replace(pm.sigmap(D), Q);
@@ -107,7 +107,7 @@ void pack_xilinx_dsp(xilinx_dsp_pm &pm)
 			log(" ffB:%s", log_id(st.ffB));
 
 		if (st.ffP)
-			log(" ffY:%s", log_id(st.ffP));
+			log(" ffP:%s", log_id(st.ffP));
 
 		log("\n");
 	}
diff --git a/passes/pmgen/xilinx_dsp.pmg b/passes/pmgen/xilinx_dsp.pmg
index 8abae9316..f95de9410 100644
--- a/passes/pmgen/xilinx_dsp.pmg
+++ b/passes/pmgen/xilinx_dsp.pmg
@@ -47,11 +47,9 @@ endcode
 // (as opposed to being a dummy)
 code sigPused
 	SigSpec P = port(dsp, \P);
-	int i;
-	for (i = GetSize(P); i > 0; i--)
-		if (nusers(P[i-1]) > 1)
-			break;
-	sigPused = P.extract(0, i).remove_const();
+	for (int i = 0; i < GetSize(P); i++)
+		if (P[i].wire && nusers(P[i]) > 1)
+			sigPused.append(P[i]);
 endcode
 
 match ffP
@@ -66,33 +64,33 @@ match ffP
 	optional
 endmatch
 
-// $mux cell left behind by dff2dffe
-//   would prefer not to run 'opt_expr -mux_undef'
-//   since that would lose information helpful for
-//   efficient wide-mux inference
-match muxP
-	if !sigPused.empty() && !ffP
-	select muxP->type.in($mux)
-	select nusers(port(muxP, \B)) == 2
-	select port(muxP, \A).is_fully_undef()
-	filter param(muxP, \WIDTH).as_int() >= GetSize(sigPused)
-	filter includes(port(muxP, \B).to_sigbit_set(), sigPused.to_sigbit_set())
-	optional
-endmatch
-
-match ffY
-	if muxP
-	select ffY->type.in($dff, $dffe)
-	select nusers(port(ffY, \D)) == 2
-	// DSP48E1 does not support clock inversion
-	select param(ffY, \CLK_POLARITY).as_bool()
-	filter param(ffY, \WIDTH).as_int() >= GetSize(sigPused)
-	filter includes(port(ffY, \D).to_sigbit_set(), port(muxP, \Y).to_sigbit_set())
-endmatch
+//// $mux cell left behind by dff2dffe
+////   would prefer not to run 'opt_expr -mux_undef'
+////   since that would lose information helpful for
+////   efficient wide-mux inference
+//match muxP
+//	if !sigPused.empty() && !ffP
+//	select muxP->type.in($mux)
+//	select nusers(port(muxP, \B)) == 2
+//	select port(muxP, \A).is_fully_undef()
+//	filter param(muxP, \WIDTH).as_int() >= GetSize(sigPused)
+//	filter includes(port(muxP, \B).to_sigbit_set(), sigPused.to_sigbit_set())
+//	optional
+//endmatch
+//
+//match ffY
+//	if muxP
+//	select ffY->type.in($dff, $dffe)
+//	select nusers(port(ffY, \D)) == 2
+//	// DSP48E1 does not support clock inversion
+//	select param(ffY, \CLK_POLARITY).as_bool()
+//	filter param(ffY, \WIDTH).as_int() >= GetSize(sigPused)
+//	filter includes(port(ffY, \D).to_sigbit_set(), port(muxP, \Y).to_sigbit_set())
+//endmatch
 
 code ffP clock
-	if (ffY)
-		ffP = ffY;
+//	if (ffY)
+//		ffP = ffY;
 
 	if (ffP) {
 		SigBit c = port(ffP, \CLK).as_bit();
-- 
2.30.2