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fabulous: add --cells-map option

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Signed-off-by: Leo Moser <leomoser99@gmail.com>
This commit is contained in:
Leo Moser 2026-06-30 15:29:26 +02:00
parent 4fac567673
commit 655cb40d0f
3 changed files with 13 additions and 3 deletions
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1
techlibs/fabulous/CMakeLists.txt
View file

@ -30,5 +30,4 @@ yosys_pass(synth_fabulous
DATA_DIR
fabulous
DATA_FILES
cells_map.v
)

30
techlibs/fabulous/cells_map.v
View file

@ -1,30 +0,0 @@
module \$lut (A, Y);
parameter WIDTH = 0;
parameter LUT = 0;
input [WIDTH-1:0] A;
output Y;
generate
if (WIDTH == 1) begin
LUT1 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.O(Y), .I0(A[0]));
end else
if (WIDTH == 2) begin
LUT2 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.O(Y), .I0(A[0]), .I1(A[1]));
end else
if (WIDTH == 3) begin
LUT3 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.O(Y), .I0(A[0]), .I1(A[1]), .I2(A[2]));
end else
if (WIDTH == 4) begin
LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.O(Y), .I0(A[0]), .I1(A[1]), .I2(A[2]), .I3(A[3]));
end else
if (WIDTH == 5) begin
LUT5 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.O(Y), .I0(A[0]), .I1(A[1]), .I2(A[2]), .I3(A[3]), .I4(A[4]));
end else
if (WIDTH == 6) begin
LUT6 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.O(Y), .I0(A[0]), .I1(A[1]), .I2(A[2]), .I3(A[3]), .I4(A[4]), .I5(A[5]));
end else begin
wire _TECHMAP_FAIL_ = 1;
end
endgenerate
endmodule

15
techlibs/fabulous/synth_fabulous.cc
View file

@ -57,6 +57,9 @@ struct SynthPass : public ScriptPass {
log(" -ff <cell_type_pattern> <init_values>\n");
log(" convert FFs to cell types via dfflegalize (can be specified multiple times).\n");
log("\n");
log(" -cells-map <cells_map>\n");
log(" map luts to corresponding cells.\n");
log("\n");
log(" -arith-map <arith_map>\n");
log(" mapping file for arithmetic operations.\n");
log("\n");
@ -117,7 +120,7 @@ struct SynthPass : public ScriptPass {
log("\n");
}
string top_module, json_file, blif_file, fsm_opts, memory_opts, carry_mode, arith_map, clkbuf_map, multiplier_map;
string top_module, json_file, blif_file, fsm_opts, memory_opts, carry_mode, cells_map, arith_map, clkbuf_map, multiplier_map;
std::vector<string> extra_plib, extra_map, extra_mlibmap;
std::vector<std::pair<string, string>> extra_ffs;
@ -183,6 +186,10 @@ struct SynthPass : public ScriptPass {
extra_ffs.push_back({cell, init});
continue;
}
if (args[argidx] == "-cells-map" && argidx + 1 < args.size()) {
cells_map = args[++argidx];
continue;
}
if (args[argidx] == "-arith-map" && argidx + 1 < args.size()) {
arith_map = args[++argidx];
continue;
@ -409,7 +416,11 @@ struct SynthPass : public ScriptPass {
}
if (check_label("map_cells")) {
run(stringf("techmap -D LUT_K=%d -map +/fabulous/cells_map.v", lut));
if (help_mode) {
run("techmap -D LUT_K=<lut> -map <cells_map.v>");
} else if (!cells_map.empty()) {
run(stringf("techmap -D LUT_K=%d -map %s", lut, cells_map.c_str()));
}
run("clean");
}