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fabulous: remove legacy arith_map.v mapping

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Signed-off-by: Leo Moser <leomoser99@gmail.com>
This commit is contained in:
Leo Moser 2026-06-24 15:03:48 +02:00
parent f79c0ad214
commit aa84f4a13b
2 changed files with 3 additions and 67 deletions
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64
techlibs/fabulous/arith_map.v
View file

@ -1,64 +0,0 @@
`default_nettype none
`ifdef ARITH_ha
(* techmap_celltype = "$alu" *)
module _80_fabulous_ha_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;
parameter _TECHMAP_CONSTMSK_CI_ = 0;
parameter _TECHMAP_CONSTVAL_CI_ = 0;
(* force_downto *)
input [A_WIDTH-1:0] A;
(* force_downto *)
input [B_WIDTH-1:0] B;
input CI, BI;
(* force_downto *)
output [Y_WIDTH-1:0] X, Y, CO;
(* force_downto *)
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));
(* force_downto *)
wire [Y_WIDTH-1:0] AA = A_buf;
(* force_downto *)
wire [Y_WIDTH-1:0] BB = BI ? ~B_buf : B_buf;
wire [Y_WIDTH:0] CARRY;
LUT4_HA #(
.INIT(16'b0),
.I0MUX(1'b1)
) carry_statrt (
.I0(), .I1(CI), .I2(CI), .I3(),
.Ci(),
.Co(CARRY[0])
);
// Carry chain
genvar i;
generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice
LUT4_HA #(
.INIT(16'b1001_0110_1001_0110), // full adder sum over (I2, I1, I0)
.I0MUX(1'b1)
) lut_i (
.I0(), .I1(AA[i]), .I2(BB[i]), .I3(),
.Ci(CARRY[i]),
.O(Y[i]),
.Co(CARRY[i+1])
);
assign CO[i] = (AA[i] && BB[i]) || ((Y[i] ^ AA[i] ^ BB[i]) && (AA[i] || BB[i]));
end endgenerate
assign X = AA ^ BB;
endmodule
`endif

6
techlibs/fabulous/synth_fabulous.cc
View file

@ -357,8 +357,7 @@ struct SynthPass : public ScriptPass
if (check_label("map_gates")) {
run("opt -full");
run(stringf("techmap -map +/techmap.v -map +/fabulous/arith_map.v -D ARITH_%s",
help_mode ? "<carry>" : carry_mode.c_str()));
run("techmap -map +/techmap.v");
run("opt -fast");
}
@ -386,11 +385,12 @@ struct SynthPass : public ScriptPass
if (check_label("map_extra")) {
if (help_mode) {
run("techmap -map <extra_map.v>...", "(for each -extra-map)");
run("techmap -map <extra_map.v> -D ARITH_<carry>...", "(for each -extra-map)");
} else if (!extra_map.empty()) {
std::string map_str = "techmap";
for (auto map : extra_map)
map_str += stringf(" -map %s", map);
map_str += stringf(" -D ARITH_%s", carry_mode.c_str());
run(map_str);
}
run("simplemap");