From: Clifford Wolf <clifford@clifford.at>
Date: Sat, 17 Jan 2015 14:39:54 +0000 (+0100)
Subject: Added MUXCY and XORCY support to synth_xilinx
X-Git-Tag: yosys-0.5~93
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=703123114530e6010b854b5e3a5a1c0a153fa4b6;p=yosys.git

Added MUXCY and XORCY support to synth_xilinx
---

diff --git a/techlibs/xilinx/Makefile.inc b/techlibs/xilinx/Makefile.inc
index b653660fa..646bd4c34 100644
--- a/techlibs/xilinx/Makefile.inc
+++ b/techlibs/xilinx/Makefile.inc
@@ -5,4 +5,5 @@ $(eval $(call add_share_file,share/xilinx,techlibs/xilinx/cells.v))
 $(eval $(call add_share_file,share/xilinx,techlibs/xilinx/cells_sim.v))
 $(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams.txt))
 $(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams.v))
+$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/arith.v))
 
diff --git a/techlibs/xilinx/arith.v b/techlibs/xilinx/arith.v
new file mode 100644
index 000000000..a154f7740
--- /dev/null
+++ b/techlibs/xilinx/arith.v
@@ -0,0 +1,91 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *  
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+(* techmap_celltype = "$lcu" *)
+module _80_xilinx_lcu (P, G, CI, CO);
+	parameter WIDTH = 2;
+
+	input [WIDTH-1:0] P, G;
+	input CI;
+
+	output [WIDTH-1:0] CO;
+
+	wire _TECHMAP_FAIL_ = WIDTH <= 2;
+
+	wire [WIDTH-1:0] C = {CO, CI};
+	wire [WIDTH-1:0] S = P & ~G;
+
+	genvar i;
+	generate for (i = 0; i < WIDTH; i = i + 1) begin:slice
+		MUXCY muxcy (
+			.CI(C[i]),
+			.DI(G[i]),
+			.S(S[i]),
+			.O(CO[i])
+		);
+	end endgenerate
+endmodule
+
+(* techmap_celltype = "$alu" *)
+module _80_xilinx_alu (A, B, CI, BI, X, Y, CO);
+	parameter A_SIGNED = 0;
+	parameter B_SIGNED = 0;
+	parameter A_WIDTH = 1;
+	parameter B_WIDTH = 1;
+	parameter Y_WIDTH = 1;
+
+	input [A_WIDTH-1:0] A;
+	input [B_WIDTH-1:0] B;
+	output [Y_WIDTH-1:0] X, Y;
+
+	input CI, BI;
+	output [Y_WIDTH-1:0] CO;
+
+	wire _TECHMAP_FAIL_ = Y_WIDTH <= 2;
+
+	wire [Y_WIDTH-1:0] A_buf, B_buf;
+	\$pos #(.A_SIGNED(A_SIGNED), .A_WIDTH(A_WIDTH), .Y_WIDTH(Y_WIDTH)) A_conv (.A(A), .Y(A_buf));
+	\$pos #(.A_SIGNED(B_SIGNED), .A_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) B_conv (.A(B), .Y(B_buf));
+
+	wire [Y_WIDTH-1:0] AA = A_buf;
+	wire [Y_WIDTH-1:0] BB = BI ? ~B_buf : B_buf;
+
+	wire [Y_WIDTH-1:0] P = AA ^ BB;
+	wire [Y_WIDTH-1:0] G = AA & BB;
+	wire [Y_WIDTH-1:0] C = {CO, CI};
+	wire [Y_WIDTH-1:0] S = P & ~G;
+
+	genvar i;
+	generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice
+		MUXCY muxcy (
+			.CI(C[i]),
+			.DI(G[i]),
+			.S(S[i]),
+			.O(CO[i])
+		);
+		XORCY xorcy (
+			.CI(C[i]),
+			.LI(S[i]),
+			.O(Y[i])
+		);
+	end endgenerate
+
+	assign X = P;
+endmodule
+
diff --git a/techlibs/xilinx/cells_sim.v b/techlibs/xilinx/cells_sim.v
index cb290db80..138a6470f 100644
--- a/techlibs/xilinx/cells_sim.v
+++ b/techlibs/xilinx/cells_sim.v
@@ -1,4 +1,8 @@
 
+// See Xilinx UG953 and UG474 for a description of the cell types below.
+// http://www.xilinx.com/support/documentation/user_guides/ug474_7Series_CLB.pdf
+// http://www.xilinx.com/support/documentation/sw_manuals/xilinx2014_4/ug953-vivado-7series-libraries.pdf
+
 module VCC(output P);
   assign P = 1;
 endmodule
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 289de4399..35bc4302e 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -73,7 +73,11 @@ struct SynthXilinxPass : public Pass {
 		log("        techmap -map +/xilinx/brams.v\n");
 		log("\n");
 		log("    fine:\n");
-		log("        synth -run fine\n");
+		log("        opt -fast -full\n");
+		log("        memory_map\n");
+		log("        opt -full\n");
+		log("        techmap -map +/techmap.v -map +/xilinx/arith.v\n");
+		log("        opt -fast\n");
 		log("\n");
 		log("    map_luts:\n");
 		log("        abc -lut 6:8\n");
@@ -144,7 +148,11 @@ struct SynthXilinxPass : public Pass {
 
 		if (check_label(active, run_from, run_to, "fine"))
 		{
-			Pass::call(design, "synth -run fine");
+			Pass::call(design, "opt -fast -full");
+			Pass::call(design, "memory_map");
+			Pass::call(design, "opt -full");
+			Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith.v");
+			Pass::call(design, "opt -fast");
 		}
 
 		if (check_label(active, run_from, run_to, "map_luts"))