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Change synth_xilinx's -nomux to -minmuxf <int>

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This commit is contained in:
Eddie Hung 2019-06-24 10:04:01 -07:00
parent d54dceb547
commit 36e6da5396
3 changed files with 82 additions and 54 deletions
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52
techlibs/xilinx/cells_map.v
View file

@ -155,6 +155,7 @@ module \$__XILINX_SHREG_ (input C, input D, input [31:0] L, input E, output Q, o
endgenerate endgenerate
endmodule endmodule
`ifdef MIN_MUX_INPUTS
module \$__XILINX_SHIFTX (A, B, Y); module \$__XILINX_SHIFTX (A, B, Y);
parameter A_SIGNED = 0; parameter A_SIGNED = 0;
parameter B_SIGNED = 0; parameter B_SIGNED = 0;
@ -207,10 +208,10 @@ module \$__XILINX_SHIFTX (A, B, Y);
localparam B_WIDTH_new = $clog2(A_WIDTH_new); localparam B_WIDTH_new = $clog2(A_WIDTH_new);
\$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(A_WIDTH_new), .B_WIDTH(B_WIDTH_new), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(A[A_WIDTH_new-1:0]), .B(B[B_WIDTH_new-1:0]), .Y(Y)); \$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(A_WIDTH_new), .B_WIDTH(B_WIDTH_new), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(A[A_WIDTH_new-1:0]), .B(B[B_WIDTH_new-1:0]), .Y(Y));
end end
else if (B_WIDTH < 3 || A_WIDTH <= 4) begin else if (A_WIDTH < `MIN_MUX_INPUTS) begin
\$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(A_WIDTH), .B_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(A), .B(B), .Y(Y)); wire _TECHMAP_FAIL_ = 1;
end end
else if (B_WIDTH == 3) begin else if (A_WIDTH <= 2 ** 3) begin
localparam a_width0 = 2 ** 2; localparam a_width0 = 2 ** 2;
localparam a_widthN = A_WIDTH - a_width0; localparam a_widthN = A_WIDTH - a_width0;
wire T0, T1; wire T0, T1;
@ -219,47 +220,61 @@ module \$__XILINX_SHIFTX (A, B, Y);
\$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux_last (.A(A[A_WIDTH-1:a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T1)); \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux_last (.A(A[A_WIDTH-1:a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T1));
else else
assign T1 = A[A_WIDTH-1]; assign T1 = A[A_WIDTH-1];
MUXF7 fpga_hard_mux (.I0(T0), .I1(T1), .S(B[B_WIDTH-1]), .O(Y)); MUXF7 fpga_hard_mux (.I0(T0), .I1(T1), .S(B[2]), .O(Y));
end end
else if (B_WIDTH == 4) begin else if (A_WIDTH <= 2 ** 4) begin
localparam a_width0 = 2 ** 2; localparam a_width0 = 2 ** 2;
localparam num_mux8 = A_WIDTH / a_width0; localparam num_mux8 = A_WIDTH / a_width0;
localparam a_widthN = A_WIDTH - num_mux8*a_width0; localparam a_widthN = A_WIDTH - num_mux8*a_width0;
wire [4-1:0] T; wire [4-1:0] T;
for (i = 0; i < 4; i++) for (i = 0; i < num_mux8; i++)
if (i < num_mux8) if (i < num_mux8)
\$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(2), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux (.A(A[i*a_width0+:a_width0]), .B(B[2-1:0]), .Y(T[i])); \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(2), .Y_WIDTH(Y_WIDTH)) fpga_mux (.A(A[i*a_width0+:a_width0]), .B(B[2-1:0]), .Y(T[i]));
else if (i == num_mux8 && a_widthN > 0) begin if (a_widthN > 0) begin
if (a_widthN > 1) if (a_widthN > 1)
\$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux_last (.A(A[A_WIDTH-1:i*a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T[i])); \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_mux_last (.A(A[A_WIDTH-1:num_mux8*a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T[num_mux8]));
else else
assign T[i] = A[A_WIDTH-1]; assign T[num_mux8] = A[A_WIDTH-1];
end end
else else
assign T[i] = 1'bx; assign T[num_mux8] = 1'bx;
\$__XILINX_MUXF78 fpga_hard_mux (.I0(T[0]), .I1(T[1]), .I2(T[2]), .I3(T[3]), .S0(B[2]), .S1(B[3]), .O(Y)); \$__XILINX_MUXF78 fpga_hard_mux (.I0(T[0]), .I1(T[1]), .I2(T[2]), .I3(T[3]), .S0(B[2]), .S1(B[3]), .O(Y));
end end
else begin else begin
localparam a_width0 = 2 ** 4; localparam a_width0 = 2 ** 4;
localparam num_mux16 = A_WIDTH / a_width0; localparam num_mux16 = A_WIDTH / a_width0;
localparam a_widthN = A_WIDTH - num_mux16*a_width0; localparam a_widthN = A_WIDTH - num_mux16*a_width0;
wire [(2**(B_WIDTH-4))-1:0] T; wire [num_mux16-1:0] T;
for (i = 0; i < 2 ** (B_WIDTH-4); i++) for (i = 0; i < num_mux16; i++)
if (i < num_mux16)
\$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(4), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux (.A(A[i*a_width0+:a_width0]), .B(B[4-1:0]), .Y(T[i])); \$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(4), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux (.A(A[i*a_width0+:a_width0]), .B(B[4-1:0]), .Y(T[i]));
else if (i == num_mux16 && a_widthN > 0) begin if (a_widthN > 0) begin
if (a_widthN > 1) if (a_widthN > 1)
\$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux_last (.A(A[A_WIDTH-1:i*a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T[i])); \$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_soft_mux_last (.A(A[A_WIDTH-1:num_mux16*a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T[num_mux16]));
else else
assign T[i] = A[A_WIDTH-1]; assign T[num_mux16] = A[A_WIDTH-1];
end end
else else
assign T[i] = 1'bx; assign T[num_mux16] = 1'bx;
\$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(2**(B_WIDTH-4)), .B_WIDTH(B_WIDTH-4), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(T), .B(B[B_WIDTH-1:4]), .Y(Y)); \$__XILINX_SHIFTX #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(2**(B_WIDTH-4)), .B_WIDTH(B_WIDTH-4), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(T), .B(B[B_WIDTH-1:4]), .Y(Y));
end end
endgenerate endgenerate
endmodule endmodule
(* techmap_celltype = "$__XILINX_SHIFTX" *)
module _90__XILINX_SHIFTX (A, B, Y);
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] Y;
\$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(A_WIDTH), .B_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(A), .B(B), .Y(Y));
endmodule
module \$_MUX8_ (A, B, C, D, E, F, G, H, S, T, U, Y); module \$_MUX8_ (A, B, C, D, E, F, G, H, S, T, U, Y);
input A, B, C, D, E, F, G, H, S, T, U; input A, B, C, D, E, F, G, H, S, T, U;
output Y; output Y;
@ -271,6 +286,7 @@ input A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, S, T, U, V;
output Y; output Y;
\$__XILINX_SHIFTX #(.A_SIGNED(0), .B_SIGNED(0), .A_WIDTH(16), .B_WIDTH(4), .Y_WIDTH(1)) _TECHMAP_REPLACE_ (.A({P,O,N,M,L,K,J,I,H,G,F,E,D,C,B,A}), .B({V,U,T,S}), .Y(Y)); \$__XILINX_SHIFTX #(.A_SIGNED(0), .B_SIGNED(0), .A_WIDTH(16), .B_WIDTH(4), .Y_WIDTH(1)) _TECHMAP_REPLACE_ (.A({P,O,N,M,L,K,J,I,H,G,F,E,D,C,B,A}), .B({V,U,T,S}), .Y(Y));
endmodule endmodule
`endif
`ifndef _ABC `ifndef _ABC
module \$__XILINX_MUXF78 (O, I0, I1, I2, I3, S0, S1); module \$__XILINX_MUXF78 (O, I0, I1, I2, I3, S0, S1);

2
techlibs/xilinx/mux_map.v
View file

@ -54,7 +54,7 @@ module \$shiftx (A, B, Y);
wire _TECHMAP_FAIL_ = 1; wire _TECHMAP_FAIL_ = 1;
end end
else begin else begin
if (B_WIDTH < 3 || A_WIDTH <= 4) if (((A_WIDTH + Y_WIDTH - 1) / Y_WIDTH) < `MIN_MUX_INPUTS)
wire _TECHMAP_FAIL_ = 1; wire _TECHMAP_FAIL_ = 1;
else else
\$__XILINX_SHIFTX #( \$__XILINX_SHIFTX #(

62
techlibs/xilinx/synth_xilinx.cc
View file

@ -73,8 +73,10 @@ struct SynthXilinxPass : public ScriptPass
log(" -nosrl\n"); log(" -nosrl\n");
log(" disable inference of shift registers\n"); log(" disable inference of shift registers\n");
log("\n"); log("\n");
log(" -nomux\n"); log(" -minmuxf <int>\n");
log(" disable inference of wide multiplexers\n"); log(" enable inference of hard multiplexer resources (MuxFx) for muxes at or\n");
log(" above this number of inputs (minimum value 5).\n");
log(" default: 0 (no inference)\n");
log("\n"); log("\n");
log(" -run <from_label>:<to_label>\n"); log(" -run <from_label>:<to_label>\n");
log(" only run the commands between the labels (see below). an empty\n"); log(" only run the commands between the labels (see below). an empty\n");
@ -97,7 +99,8 @@ struct SynthXilinxPass : public ScriptPass
} }
std::string top_opt, edif_file, blif_file, abc, arch; std::string top_opt, edif_file, blif_file, abc, arch;
bool flatten, retime, vpr, nocarry, nobram, nodram, nosrl, nomux; bool flatten, retime, vpr, nocarry, nobram, nodram, nosrl;
int minmuxf;
void clear_flags() YS_OVERRIDE void clear_flags() YS_OVERRIDE
{ {
@ -112,8 +115,8 @@ struct SynthXilinxPass : public ScriptPass
nobram = false; nobram = false;
nodram = false; nodram = false;
nosrl = false; nosrl = false;
nomux = false;
arch = "xc7"; arch = "xc7";
minmuxf = 0;
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@ -176,8 +179,8 @@ struct SynthXilinxPass : public ScriptPass
nosrl = true; nosrl = true;
continue; continue;
} }
if (args[argidx] == "-nomux") { if (args[argidx] == "-minmuxf" && argidx+1 < args.size()) {
nomux = true; minmuxf = atoi(args[++argidx].c_str());
continue; continue;
} }
if (args[argidx] == "-abc9") { if (args[argidx] == "-abc9") {
@ -191,6 +194,9 @@ struct SynthXilinxPass : public ScriptPass
if (arch != "xcup" && arch != "xcu" && arch != "xc7" && arch != "xc6s") if (arch != "xcup" && arch != "xcu" && arch != "xc7" && arch != "xc6s")
log_cmd_error("Invalid Xilinx -arch setting: %s\n", arch.c_str()); log_cmd_error("Invalid Xilinx -arch setting: %s\n", arch.c_str());
if (minmuxf != 0 && minmuxf < 5)
log_cmd_error("-minmuxf value must be 0 or >= 5.\n");
if (!design->full_selection()) if (!design->full_selection())
log_cmd_error("This command only operates on fully selected designs!\n"); log_cmd_error("This command only operates on fully selected designs!\n");
@ -227,9 +233,9 @@ struct SynthXilinxPass : public ScriptPass
run("check"); run("check");
run("opt"); run("opt");
if (help_mode) if (help_mode)
run("wreduce [c:* t:$mux %d]", "(no selection if -nomux)"); run("wreduce [c:* t:$mux %d]", "(selection for '-minmuxf' only)");
else else
run("wreduce" + std::string(nomux ? "" : " c:* t:$mux %d")); run("wreduce" + std::string(minmuxf > 0 ? " c:* t:$mux %d" : ""));
run("peepopt"); run("peepopt");
run("opt_clean"); run("opt_clean");
run("alumacc"); run("alumacc");
@ -240,15 +246,15 @@ struct SynthXilinxPass : public ScriptPass
run("memory -nomap"); run("memory -nomap");
run("opt_clean"); run("opt_clean");
if (!nomux || help_mode) if (minmuxf > 0 || help_mode)
run("muxpack", " (skip if '-nomux')"); run("muxpack", " ('-minmuxf' only)");
// shregmap -tech xilinx can cope with $shiftx and $mux // shregmap -tech xilinx can cope with $shiftx and $mux
// cells for identifying variable-length shift registers, // cells for identifying variable-length shift registers,
// so attempt to convert $pmux-es to the former // so attempt to convert $pmux-es to the former
// Also: wide multiplexer inference benefits from this too // Also: wide multiplexer inference benefits from this too
if (!(nosrl && nomux) || help_mode) if (!(nosrl && minmuxf == 0) || help_mode)
run("pmux2shiftx", "(skip if '-nosrl' and '-nomux')"); run("pmux2shiftx", "(skip if '-nosrl' and '-minmuxf' < 5)");
} }
if (check_label("bram", "(skip if '-nobram')")) { if (check_label("bram", "(skip if '-nobram')")) {
@ -270,12 +276,15 @@ struct SynthXilinxPass : public ScriptPass
run("memory_map"); run("memory_map");
run("dffsr2dff"); run("dffsr2dff");
run("dff2dffe"); run("dff2dffe");
if (!nomux || help_mode) { if (minmuxf > 0 || help_mode) {
run("simplemap t:$mux", " (skip if -nomux)"); run("simplemap t:$mux", " ('-minmuxf' only)");
if (minmuxf > 0 || help_mode) {
// NB: Cost of mux2 is 100; mux8 should cost between 3 and 4 // NB: Cost of mux2 is 100; mux8 should cost between 3 and 4
// of those so that 4:1 muxes and below are implemented // of those so that 4:1 muxes and below are implemented
// out of mux2s // out of mux2s
run("muxcover -mux8=350 -mux16=400 -dmux=0", "(skip if -nomux)"); std::string muxcover_args = " -dmux=0 -mux8=350 -mux16=400";
run("muxcover " + muxcover_args, "('-minmuxf' only)");
}
} }
run("opt -full"); run("opt -full");
@ -287,26 +296,29 @@ struct SynthXilinxPass : public ScriptPass
run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')"); run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')");
} }
std::string techmap_files = " -map +/techmap.v"; std::string techmap_args = " -map +/techmap.v";
if (help_mode) if (help_mode)
techmap_files += " [-map +/xilinx/mux_map.v]"; techmap_args += " [-map +/xilinx/mux_map.v]";
else if (!nomux) else if (minmuxf > 0)
techmap_files += " -map +/xilinx/mux_map.v"; techmap_args += stringf(" -D MIN_MUX_INPUTS=%d -map +/xilinx/mux_map.v", minmuxf);
if (help_mode) if (help_mode)
techmap_files += " [-map +/xilinx/arith_map.v]"; techmap_args += " [-map +/xilinx/arith_map.v]";
else if (!nocarry) { else if (!nocarry) {
techmap_files += " -map +/xilinx/arith_map.v"; techmap_args += " -map +/xilinx/arith_map.v";
if (vpr) if (vpr)
techmap_files += " -D _EXPLICIT_CARRY"; techmap_args += " -D _EXPLICIT_CARRY";
else if (abc == "abc9") else if (abc == "abc9")
techmap_files += " -D _CLB_CARRY"; techmap_args += " -D _CLB_CARRY";
} }
run("techmap " + techmap_files); run("techmap " + techmap_args);
run("opt -fast"); run("opt -fast");
} }
if (check_label("map_cells")) { if (check_label("map_cells")) {
run("techmap -map +/techmap.v -D _ABC -map +/xilinx/cells_map.v"); std::string techmap_args = "-map +/techmap.v -D _ABC -map +/xilinx/cells_map.v";
if (minmuxf > 0)
techmap_args += stringf(" -D MIN_MUX_INPUTS=%d", minmuxf);
run("techmap " + techmap_args);
run("clean"); run("clean");
} }