Add mul2dsp multiplier splitting rule and ECP5 mapping

Signed-off-by: David Shah <dave@ds0.me>

3 files changed, 42 insertions, 2 deletions

diff --git a/techlibs/ecp5/Makefile.inc b/techlibs/ecp5/Makefile.inc
index ff39ba4fe..a2f5cadee 100644
--- a/techlibs/ecp5/Makefile.inc
+++ b/techlibs/ecp5/Makefile.inc
@@ -10,6 +10,7 @@ $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/brams_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/bram.txt))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/arith_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/latches_map.v))
+$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/dsp_map.v))
 
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/abc_5g.box))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/abc_5g.lut))
diff --git a/techlibs/ecp5/dsp_map.v b/techlibs/ecp5/dsp_map.v
new file mode 100644
index 000000000..22e30574c
--- /dev/null
+++ b/techlibs/ecp5/dsp_map.v
@@ -0,0 +1,10 @@
+module \$__MUL18X18 (input [17:0] A, input [17:0] B, output [35:0] OUT);
+	MULT18X18D mult_i(
+		.A0(A[0]), .A1(A[1]), .A2(A[2]), .A3(A[3]), .A4(A[4]), .A5(A[5]), .A6(A[6]), .A7(A[7]), .A8(A[8]), .A9(A[9]), .A10(A[10]), .A11(A[11]), .A12(A[12]), .A13(A[13]), .A14(A[14]), .A15(A[15]), .A16(A[16]), .A17(A[17]),
+		.B0(B[0]), .B1(B[1]), .B2(B[2]), .B3(B[3]), .B4(B[4]), .B5(B[5]), .B6(B[6]), .B7(B[7]), .B8(B[8]), .B9(B[9]), .B10(B[10]), .B11(B[11]), .B12(B[12]), .B13(B[13]), .B14(B[14]), .B15(B[15]), .B16(B[16]), .B17(B[17]),
+		.C17(1'b0), .C16(1'b0), .C15(1'b0), .C14(1'b0), .C13(1'b0), .C12(1'b0), .C11(1'b0), .C10(1'b0), .C9(1'b0), .C8(1'b0), .C7(1'b0), .C6(1'b0), .C5(1'b0), .C4(1'b0), .C3(1'b0), .C2(1'b0), .C1(1'b0), .C0(1'b0),
+		.SIGNEDA(1'b0), .SIGNEDB(1'b0), .SOURCEA(1'b0), .SOURCEB(1'b0),
+
+		.P0(OUT[0]), .P1(OUT[1]), .P2(OUT[2]), .P3(OUT[3]), .P4(OUT[4]), .P5(OUT[5]), .P6(OUT[6]), .P7(OUT[7]), .P8(OUT[8]), .P9(OUT[9]), .P10(OUT[10]), .P11(OUT[11]), .P12(OUT[12]), .P13(OUT[13]), .P14(OUT[14]), .P15(OUT[15]), .P16(OUT[16]), .P17(OUT[17]), .P18(OUT[18]), .P19(OUT[19]), .P20(OUT[20]), .P21(OUT[21]), .P22(OUT[22]), .P23(OUT[23]), .P24(OUT[24]), .P25(OUT[25]), .P26(OUT[26]), .P27(OUT[27]), .P28(OUT[28]), .P29(OUT[29]), .P30(OUT[30]), .P31(OUT[31]), .P32(OUT[32]), .P33(OUT[33]), .P34(OUT[34]), .P35(OUT[35])
+	);
+endmodule
\ No newline at end of file
diff --git a/techlibs/ecp5/synth_ecp5.cc b/techlibs/ecp5/synth_ecp5.cc
index f16a47f01..3b4185930 100644
--- a/techlibs/ecp5/synth_ecp5.cc
+++ b/techlibs/ecp5/synth_ecp5.cc
@@ -89,6 +89,9 @@ struct SynthEcp5Pass : public ScriptPass
 		log("        generate an output netlist (and BLIF file) suitable for VPR\n");
 		log("        (this feature is experimental and incomplete)\n");
 		log("\n");
+		log("    -dsp\n");
+		log("        map multipliers to MULT18X18D (EXPERIMENTAL)\n");
+		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
 		help_script();
@@ -96,7 +99,7 @@ struct SynthEcp5Pass : public ScriptPass
 	}
 
 	string top_opt, blif_file, edif_file, json_file;
-	bool noccu2, nodffe, nobram, nodram, nowidelut, flatten, retime, abc2, abc9, vpr;
+	bool noccu2, nodffe, nobram, nodram, nowidelut, flatten, retime, abc2, abc9, dsp, vpr;
 
 	void clear_flags() YS_OVERRIDE
 	{
@@ -114,6 +117,7 @@ struct SynthEcp5Pass : public ScriptPass
 		abc2 = false;
 		vpr = false;
 		abc9 = false;
+		dsp = false;
 	}
 
 	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -192,6 +196,10 @@ struct SynthEcp5Pass : public ScriptPass
 				abc9 = true;
 				continue;
 			}
+			if (args[argidx] == "-dsp") {
+				dsp = true;
+				continue;
+			}
 			break;
 		}
 		extra_args(args, argidx, design);
@@ -225,7 +233,28 @@ struct SynthEcp5Pass : public ScriptPass
 
 		if (check_label("coarse"))
 		{
-			run("synth -run coarse");
+			run("opt_expr");
+			run("opt_clean");
+			run("check");
+			run("opt");
+			run("wreduce");
+			run("peepopt");
+			run("opt_clean");
+			run("share");
+			run("techmap -map +/cmp2lut.v -D LUT_WIDTH=4");
+			run("opt_expr");
+			run("opt_clean");
+			if (dsp) {
+				run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=18 -D DSP_B_MAXWIDTH=18 -D DSP_NAME=$__MUL18X18");
+				run("clean");
+				run("techmap -map +/ecp5/dsp_map.v");
+			}
+			run("alumacc");
+			run("opt");
+			run("fsm");
+			run("opt -fast");
+			run("memory -nomap");
+			run("opt_clean");
 		}
 
 		if (!nobram && check_label("bram", "(skip if -nobram)"))