xilinx: Improve flip-flop handling.

This adds support for infering more kinds of flip-flops:

- FFs with async set/reset and clock enable
- FFs with sync set/reset
- FFs with sync set/reset and clock enable

Some passes have been moved (and some added) in order for dff2dffs to
work correctly.

This gives us complete coverage of Virtex 6+ and Spartan 6 flip-flop
capabilities (though not latch capabilities).  Older FPGAs also support
having both a set and a reset input, which will be handled at a later
data.

4 files changed, 228 insertions, 38 deletions

diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v
index de2068bc5..cc180f2b9 100644
--- a/techlibs/xilinx/cells_map.v
+++ b/techlibs/xilinx/cells_map.v
@@ -28,6 +28,33 @@ module _90_dff_nn1_to_np1 (input D, C, R, output Q); \$_DFF_NP1_   _TECHMAP_REPL
 (* techmap_celltype = "$_DFF_PN1_" *)
 module _90_dff_pn1_to_pp1 (input D, C, R, output Q); \$_DFF_PP1_   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R)); endmodule
 
+(* techmap_celltype = "$__DFFE_NN0" *)
+module _90_dffe_nn0_to_np0 (input D, C, R, E, output Q); \$__DFFE_NP0  _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+(* techmap_celltype = "$__DFFE_PN0" *)
+module _90_dffe_pn0_to_pp0 (input D, C, R, E, output Q); \$__DFFE_PP0  _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+(* techmap_celltype = "$__DFFE_NN1" *)
+module _90_dffe_nn1_to_np1 (input D, C, R, E, output Q); \$__DFFE_NP1   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+(* techmap_celltype = "$__DFFE_PN1" *)
+module _90_dffe_pn1_to_pp1 (input D, C, R, E, output Q); \$__DFFE_PP1   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+
+(* techmap_celltype = "$__DFFS_NN0_" *)
+module _90_dffs_nn0_to_np0 (input D, C, R, output Q); \$__DFFS_NP0_  _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R)); endmodule
+(* techmap_celltype = "$__DFFS_PN0_" *)
+module _90_dffs_pn0_to_pp0 (input D, C, R, output Q); \$__DFFS_PP0_  _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R)); endmodule
+(* techmap_celltype = "$__DFFS_NN1_" *)
+module _90_dffs_nn1_to_np1 (input D, C, R, output Q); \$__DFFS_NP1_   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R)); endmodule
+(* techmap_celltype = "$__DFFS_PN1_" *)
+module _90_dffs_pn1_to_pp1 (input D, C, R, output Q); \$__DFFS_PP1_   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R)); endmodule
+
+(* techmap_celltype = "$__DFFSE_NN0" *)
+module _90_dffse_nn0_to_np0 (input D, C, R, E, output Q); \$__DFFSE_NP0  _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+(* techmap_celltype = "$__DFFSE_PN0" *)
+module _90_dffse_pn0_to_pp0 (input D, C, R, E, output Q); \$__DFFSE_PP0  _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+(* techmap_celltype = "$__DFFSE_NN1" *)
+module _90_dffse_nn1_to_np1 (input D, C, R, E, output Q); \$__DFFSE_NP1   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+(* techmap_celltype = "$__DFFSE_PN1" *)
+module _90_dffse_pn1_to_pp1 (input D, C, R, E, output Q); \$__DFFSE_PP1   _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .R(~R), .E(E)); endmodule
+
 module \$__SHREG_ (input C, input D, input E, output Q);
   parameter DEPTH = 0;
   parameter [DEPTH-1:0] INIT = 0;
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 2c5686a35..a061c8dc0 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -444,6 +444,16 @@ struct SynthXilinxPass : public ScriptPass
 		}
 
 		if (check_label("map_ffram")) {
+			// Required for dffsr2dff to work.
+			run("simplemap t:$dff t:$adff t:$mux");
+			// Needs to be done before opt -mux_bool happens.
+			run("dffsr2dff");
+			if (help_mode)
+				run("dff2dffs [-match-init]", "(-match-init for xc6s only)");
+			else if (family == "xc6s")
+				run("dff2dffs -match-init");
+			else
+				run("dff2dffs");
 			if (widemux > 0)
 				run("opt -fast -mux_bool -undriven -fine"); // Necessary to omit -mux_undef otherwise muxcover
 									    // performs less efficiently
@@ -453,14 +463,11 @@ struct SynthXilinxPass : public ScriptPass
 		}
 
 		if (check_label("fine")) {
-			run("dffsr2dff");
-			run("dff2dffe");
+			run("dff2dffe -direct-match $_DFF_* -direct-match $__DFFS_*");
 			if (help_mode) {
-				run("simplemap t:$mux", "         ('-widemux' only)");
 				run("muxcover <internal options>, ('-widemux' only)");
 			}
 			else if (widemux > 0) {
-				run("simplemap t:$mux");
 				constexpr int cost_mux2 = 100;
 				std::string muxcover_args = stringf(" -nodecode -mux2=%d", cost_mux2);
 				switch (widemux) {
diff --git a/techlibs/xilinx/xc6s_ff_map.v b/techlibs/xilinx/xc6s_ff_map.v
index bf35b09e5..c40f446e0 100644
--- a/techlibs/xilinx/xc6s_ff_map.v
+++ b/techlibs/xilinx/xc6s_ff_map.v
@@ -27,6 +27,8 @@
 
 `ifndef _NO_FFS
 
+// No reset.
+
 module  \$_DFF_N_   (input D, C, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
@@ -46,6 +48,8 @@ module  \$_DFF_P_   (input D, C, output Q);
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
+// No reset, enable.
+
 module  \$_DFFE_NP_ (input D, C, E, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
@@ -65,80 +69,168 @@ module  \$_DFFE_PP_ (input D, C, E, output Q);
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
-module  \$_DFF_NN0_ (input D, C, R, output Q);
+// Async reset.
+
+module  \$_DFF_NP0_ (input D, C, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
     $error("Spartan 6 doesn't support FFs with asynchronous reset initialized to 1");
   else
-    FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR(!R));
+    FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_NP0_ (input D, C, R, output Q);
+module  \$_DFF_PP0_ (input D, C, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
     $error("Spartan 6 doesn't support FFs with asynchronous reset initialized to 1");
   else
-    FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
+    FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PN0_ (input D, C, R, output Q);
+
+module  \$_DFF_NP1_ (input D, C, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
+    $error("Spartan 6 doesn't support FFs with asynchronous set initialized to 0");
+  else
+    FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+module  \$_DFF_PP1_ (input D, C, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
+    $error("Spartan 6 doesn't support FFs with asynchronous set initialized to 0");
+  else
+    FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// Async reset, enable.
+
+module  \$__DFFE_NP0 (input D, C, E, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
     $error("Spartan 6 doesn't support FFs with asynchronous reset initialized to 1");
   else
-    FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR(!R));
+    FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .CLR( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PP0_ (input D, C, R, output Q);
+module  \$__DFFE_PP0 (input D, C, E, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
     $error("Spartan 6 doesn't support FFs with asynchronous reset initialized to 1");
   else
-    FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
+    FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .CLR( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
-module  \$_DFF_NN1_ (input D, C, R, output Q);
+module  \$__DFFE_NP1 (input D, C, E, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
     $error("Spartan 6 doesn't support FFs with asynchronous set initialized to 0");
   else
-    FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE(!R));
+    FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .PRE( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_NP1_ (input D, C, R, output Q);
+module  \$__DFFE_PP1 (input D, C, E, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
     $error("Spartan 6 doesn't support FFs with asynchronous set initialized to 0");
   else
-    FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
+    FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .PRE( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// Sync reset.
+
+module  \$__DFFS_NP0_ (input D, C, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+    $error("Spartan 6 doesn't support FFs with reset initialized to 1");
+  else
+    FDRE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .R( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PN1_ (input D, C, R, output Q);
+module  \$__DFFS_PP0_ (input D, C, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+    $error("Spartan 6 doesn't support FFs with reset initialized to 1");
+  else
+    FDRE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .R( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+module  \$__DFFS_NP1_ (input D, C, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
-    $error("Spartan 6 doesn't support FFs with asynchronous set initialized to 0");
+    $error("Spartan 6 doesn't support FFs with set initialized to 0");
   else
-    FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE(!R));
+    FDSE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .S( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PP1_ (input D, C, R, output Q);
+module  \$__DFFS_PP1_ (input D, C, R, output Q);
   parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
-    $error("Spartan 6 doesn't support FFs with asynchronous set initialized to 0");
+    $error("Spartan 6 doesn't support FFs with set initialized to 0");
   else
-    FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
+    FDSE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .S( R));
   endgenerate
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
+// Sync reset, enable.
+
+module  \$__DFFSE_NP0 (input D, C, E, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+    $error("Spartan 6 doesn't support FFs with reset initialized to 1");
+  else
+    FDRE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .R( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+module  \$__DFFSE_PP0 (input D, C, E, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+    $error("Spartan 6 doesn't support FFs with reset initialized to 1");
+  else
+    FDRE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .R( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+module  \$__DFFSE_NP1 (input D, C, E, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
+    $error("Spartan 6 doesn't support FFs with set initialized to 0");
+  else
+    FDSE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .S( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+module  \$__DFFSE_PP1 (input D, C, E, R, output Q);
+  parameter [0:0] _TECHMAP_WIREINIT_Q_ = 1'bx;
+  generate if (_TECHMAP_WIREINIT_Q_ === 1'b0)
+    $error("Spartan 6 doesn't support FFs with set initialized to 0");
+  else
+    FDSE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .S( R));
+  endgenerate
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// Latches (no reset).
+
 module  \$_DLATCH_N_ (input E, D, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
   generate if (_TECHMAP_WIREINIT_Q_ === 1'b1)
@@ -158,5 +250,7 @@ module  \$_DLATCH_P_ (input E, D, output Q);
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
+// Latches with reset (TODO).
+
 `endif
 
diff --git a/techlibs/xilinx/xc7_ff_map.v b/techlibs/xilinx/xc7_ff_map.v
index 32ca9f560..2bd874457 100644
--- a/techlibs/xilinx/xc7_ff_map.v
+++ b/techlibs/xilinx/xc7_ff_map.v
@@ -37,6 +37,8 @@
 
 `ifndef _NO_FFS
 
+// No reset.
+
 module  \$_DFF_N_   (input D, C, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
   FDRE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .R(1'b0));
@@ -48,6 +50,8 @@ module  \$_DFF_P_   (input D, C, output Q);
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
+// No reset, enable.
+
 module  \$_DFFE_NP_ (input D, C, E, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
   FDRE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E),    .R(1'b0));
@@ -59,47 +63,103 @@ module  \$_DFFE_PP_ (input D, C, E, output Q);
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
-module  \$_DFF_NN0_ (input D, C, R, output Q);
+// Async reset.
+
+module  \$_DFF_NP0_ (input D, C, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR(!R));
+  FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_NP0_ (input D, C, R, output Q);
+module  \$_DFF_PP0_ (input D, C, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
+  FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PN0_ (input D, C, R, output Q);
+
+module  \$_DFF_NP1_ (input D, C, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR(!R));
+  FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PP0_ (input D, C, R, output Q);
+module  \$_DFF_PP1_ (input D, C, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .CLR( R));
+  FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
-module  \$_DFF_NN1_ (input D, C, R, output Q);
+// Async reset, enable.
+
+module  \$__DFFE_NP0 (input D, C, E, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE(!R));
+  FDCE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .CLR( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_NP1_ (input D, C, R, output Q);
+module  \$__DFFE_PP0 (input D, C, E, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
+  FDCE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .CLR( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PN1_ (input D, C, R, output Q);
+
+module  \$__DFFE_NP1 (input D, C, E, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE(!R));
+  FDPE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .PRE( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
-module  \$_DFF_PP1_ (input D, C, R, output Q);
+module  \$__DFFE_PP1 (input D, C, E, R, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
-  FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .PRE( R));
+  FDPE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .PRE( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// Sync reset.
+
+module  \$__DFFS_NP0_ (input D, C, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDRE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .R( R));
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
+module  \$__DFFS_PP0_ (input D, C, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDRE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .R( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+module  \$__DFFS_NP1_ (input D, C, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDSE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .S( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+module  \$__DFFS_PP1_ (input D, C, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDSE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(1'b1), .S( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// Sync reset, enable.
+
+module  \$__DFFSE_NP0 (input D, C, E, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDRE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .R( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+module  \$__DFFSE_PP0 (input D, C, E, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDRE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .R( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+module  \$__DFFSE_NP1 (input D, C, E, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDSE_1 #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .S( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+module  \$__DFFSE_PP1 (input D, C, E, R, output Q);
+  parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
+  FDSE   #(.INIT(_TECHMAP_WIREINIT_Q_)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(E), .S( R));
+  wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// Latches (no reset).
 
 module  \$_DLATCH_N_ (input E, D, output Q);
   parameter _TECHMAP_WIREINIT_Q_ = 1'bx;
@@ -112,5 +172,7 @@ module  \$_DLATCH_P_ (input E, D, output Q);
   wire _TECHMAP_REMOVEINIT_Q_ = 1;
 endmodule
 
+// Latches with reset (TODO).
+
 `endif