peepopt: Remove now-redundant dffmux pattern.

3 files changed, 0 insertions, 175 deletions

diff --git a/passes/pmgen/Makefile.inc b/passes/pmgen/Makefile.inc
index 1a57bef7d..c6bbc386a 100644
--- a/passes/pmgen/Makefile.inc
+++ b/passes/pmgen/Makefile.inc
@@ -36,7 +36,6 @@ $(eval $(call add_extra_objs,passes/pmgen/peepopt_pm.h))
 
 PEEPOPT_PATTERN  = passes/pmgen/peepopt_shiftmul.pmg
 PEEPOPT_PATTERN += passes/pmgen/peepopt_muldiv.pmg
-PEEPOPT_PATTERN += passes/pmgen/peepopt_dffmux.pmg
 
 passes/pmgen/peepopt_pm.h: passes/pmgen/pmgen.py $(PEEPOPT_PATTERN)
 	$(P) mkdir -p passes/pmgen && $(PYTHON_EXECUTABLE) $< -o $@ -p peepopt $(filter-out $<,$^)
diff --git a/passes/pmgen/peepopt.cc b/passes/pmgen/peepopt.cc
index c16b4486d..a9c62fcf6 100644
--- a/passes/pmgen/peepopt.cc
+++ b/passes/pmgen/peepopt.cc
@@ -67,8 +67,6 @@ struct PeepoptPass : public Pass {
 				GENERATE_PATTERN(peepopt_pm, shiftmul);
 			else if (genmode == "muldiv")
 				GENERATE_PATTERN(peepopt_pm, muldiv);
-			else if (genmode == "dffmux")
-				GENERATE_PATTERN(peepopt_pm, dffmux);
 			else
 				log_abort();
 			return;
@@ -106,7 +104,6 @@ struct PeepoptPass : public Pass {
 
 				pm.run_shiftmul();
 				pm.run_muldiv();
-				pm.run_dffmux();
 
 				for (auto w : module->wires()) {
 					auto it = w->attributes.find(ID::init);
diff --git a/passes/pmgen/peepopt_dffmux.pmg b/passes/pmgen/peepopt_dffmux.pmg
deleted file mode 100644
index 0069b0570..000000000
--- a/passes/pmgen/peepopt_dffmux.pmg
+++ /dev/null
@@ -1,171 +0,0 @@
-pattern dffmux
-
-state <IdString> cemuxAB rstmuxBA
-state <SigSpec> sigD
-
-match dff
-	select dff->type == $dff
-	select GetSize(port(dff, \D)) > 1
-endmatch
-
-code sigD
-	sigD = port(dff, \D);
-endcode
-
-match rstmux
-	select rstmux->type == $mux
-	select GetSize(port(rstmux, \Y)) > 1
-	index <SigSpec> port(rstmux, \Y) === sigD
-	choice <IdString> BA {\B, \A}
-	select port(rstmux, BA).is_fully_const()
-	set rstmuxBA BA
-	semioptional
-endmatch
-
-code sigD
-	if (rstmux)
-		sigD = port(rstmux, rstmuxBA == \B ? \A : \B);
-endcode
-
-match cemux
-	select cemux->type == $mux
-	select GetSize(port(cemux, \Y)) > 1
-	index <SigSpec> port(cemux, \Y) === sigD
-	choice <IdString> AB {\A, \B}
-	index <SigSpec> port(cemux, AB) === port(dff, \Q)
-	set cemuxAB AB
-	semioptional
-endmatch
-
-code
-	if (!cemux && !rstmux)
-		reject;
-endcode
-
-code
-	Const rst;
-	SigSpec D;
-	if (cemux) {
-		D = port(cemux, cemuxAB == \A ? \B : \A);
-		if (rstmux)
-			rst = port(rstmux, rstmuxBA).as_const();
-		else
-			rst = Const(State::Sx, GetSize(D));
-	}
-	else {
-		log_assert(rstmux);
-		D = port(rstmux, rstmuxBA  == \B ? \A : \B);
-		rst = port(rstmux, rstmuxBA).as_const();
-	}
-	SigSpec Q = port(dff, \Q);
-	int width = GetSize(D);
-
-	SigSpec dffD = dff->getPort(\D);
-	SigSpec dffQ = dff->getPort(\Q);
-
-	Const initval;
-	for (auto b : Q) {
-		auto it = initbits.find(b);
-		initval.bits.push_back(it == initbits.end() ? State::Sx : it->second);
-	}
-
-	auto cmpx = [=](State lhs, State rhs) {
-		if (lhs == State::Sx || rhs == State::Sx)
-			return true;
-		return lhs == rhs;
-	};
-
-	int i = width-1;
-	while (i > 1) {
-		if (D[i] != D[i-1])
-			break;
-		if (!cmpx(rst[i], rst[i-1]))
-			break;
-		if (!cmpx(initval[i], initval[i-1]))
-			break;
-		if (!cmpx(rst[i], initval[i]))
-			break;
-		rminitbits.insert(Q[i]);
-		module->connect(Q[i], Q[i-1]);
-		i--;
-	}
-	if (i < width-1) {
-		did_something = true;
-		if (cemux) {
-			SigSpec ceA = cemux->getPort(\A);
-			SigSpec ceB = cemux->getPort(\B);
-			SigSpec ceY = cemux->getPort(\Y);
-			ceA.remove(i, width-1-i);
-			ceB.remove(i, width-1-i);
-			ceY.remove(i, width-1-i);
-			cemux->setPort(\A, ceA);
-			cemux->setPort(\B, ceB);
-			cemux->setPort(\Y, ceY);
-			cemux->fixup_parameters();
-			blacklist(cemux);
-		}
-		if (rstmux) {
-			SigSpec rstA = rstmux->getPort(\A);
-			SigSpec rstB = rstmux->getPort(\B);
-			SigSpec rstY = rstmux->getPort(\Y);
-			rstA.remove(i, width-1-i);
-			rstB.remove(i, width-1-i);
-			rstY.remove(i, width-1-i);
-			rstmux->setPort(\A, rstA);
-			rstmux->setPort(\B, rstB);
-			rstmux->setPort(\Y, rstY);
-			rstmux->fixup_parameters();
-			blacklist(rstmux);
-		}
-		dffD.remove(i, width-1-i);
-		dffQ.remove(i, width-1-i);
-		dff->setPort(\D, dffD);
-		dff->setPort(\Q, dffQ);
-		dff->fixup_parameters();
-		blacklist(dff);
-
-		log("dffcemux pattern in %s: dff=%s, cemux=%s, rstmux=%s; removed top %d bits.\n", log_id(module), log_id(dff), log_id(cemux, "n/a"), log_id(rstmux, "n/a"), width-1-i);
-		width = i+1;
-	}
-	if (cemux) {
-		SigSpec ceA = cemux->getPort(\A);
-		SigSpec ceB = cemux->getPort(\B);
-		SigSpec ceY = cemux->getPort(\Y);
-
-		int count = 0;
-		for (int i = width-1; i >= 0; i--) {
-			if (D[i].wire)
-				continue;
-			if (cmpx(rst[i], D[i].data) && cmpx(initval[i], D[i].data)) {
-				count++;
-				rminitbits.insert(Q[i]);
-				module->connect(Q[i], D[i]);
-				ceA.remove(i);
-				ceB.remove(i);
-				ceY.remove(i);
-				dffD.remove(i);
-				dffQ.remove(i);
-			}
-		}
-		if (count > 0)
-		{
-			did_something = true;
-
-			cemux->setPort(\A, ceA);
-			cemux->setPort(\B, ceB);
-			cemux->setPort(\Y, ceY);
-			cemux->fixup_parameters();
-			blacklist(cemux);
-
-			dff->setPort(\D, dffD);
-			dff->setPort(\Q, dffQ);
-			dff->fixup_parameters();
-			blacklist(dff);
-
-			log("dffcemux pattern in %s: dff=%s, cemux=%s, rstmux=%s; removed %d constant bits.\n", log_id(module), log_id(dff), log_id(cemux), log_id(rstmux, "n/a"), count);
-		}
-	}
-
-	if (did_something)
-		accept;
-endcode