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-rw-r--r--techlibs/xilinx/arith_map.v114
-rw-r--r--techlibs/xilinx/cells_sim.v23
-rw-r--r--techlibs/xilinx/synth_xilinx.cc44
3 files changed, 13 insertions, 168 deletions
diff --git a/techlibs/xilinx/arith_map.v b/techlibs/xilinx/arith_map.v
index 2fc216908..eb8a04bde 100644
--- a/techlibs/xilinx/arith_map.v
+++ b/techlibs/xilinx/arith_map.v
@@ -35,13 +35,7 @@ module _80_xilinx_lcu (P, G, CI, CO);
genvar i;
-`ifdef _EXPLICIT_CARRY
- localparam EXPLICIT_CARRY = 1'b1;
-`else
- localparam EXPLICIT_CARRY = 1'b0;
-`endif
-
-generate if (EXPLICIT_CARRY || `LUT_SIZE == 4) begin
+generate if (`LUT_SIZE == 4) begin
(* force_downto *)
wire [WIDTH-1:0] C = {CO, CI};
@@ -135,12 +129,6 @@ module _80_xilinx_alu (A, B, CI, BI, X, Y, CO);
genvar i;
-`ifdef _EXPLICIT_CARRY
- localparam EXPLICIT_CARRY = 1'b1;
-`else
- localparam EXPLICIT_CARRY = 1'b0;
-`endif
-
generate if (`LUT_SIZE == 4) begin
(* force_downto *)
@@ -163,106 +151,6 @@ generate if (`LUT_SIZE == 4) begin
);
end endgenerate
-end else if (EXPLICIT_CARRY) begin
-
- (* force_downto *)
- wire [Y_WIDTH-1:0] S = AA ^ BB;
-
- wire CINIT;
- // Carry chain.
- //
- // VPR requires that the carry chain never hit the fabric. The CO input
- // to this techmap is the carry outputs for synthesis, e.g. might hit the
- // fabric.
- //
- // So we maintain two wire sets, CO_CHAIN is the carry that is for VPR,
- // e.g. off fabric dedicated chain. CO is the carry outputs that are
- // available to the fabric.
- (* force_downto *)
- wire [Y_WIDTH-1:0] CO_CHAIN;
- (* force_downto *)
- wire [Y_WIDTH-1:0] C = {CO_CHAIN, CINIT};
-
- // If carry chain is being initialized to a constant, techmap the constant
- // source. Otherwise techmap the fabric source.
- generate for (i = 0; i < 1; i = i + 1) begin:slice
- CARRY0 #(.CYINIT_FABRIC(1)) carry(
- .CI_INIT(CI),
- .DI(AA[0]),
- .S(S[0]),
- .CO_CHAIN(CO_CHAIN[0]),
- .CO_FABRIC(CO[0]),
- .O(Y[0])
- );
- end endgenerate
-
- generate for (i = 1; i < Y_WIDTH-1; i = i + 1) begin:slice
- if(i % 4 == 0) begin
- CARRY0 carry (
- .CI(C[i]),
- .DI(AA[i]),
- .S(S[i]),
- .CO_CHAIN(CO_CHAIN[i]),
- .CO_FABRIC(CO[i]),
- .O(Y[i])
- );
- end
- else
- begin
- CARRY carry (
- .CI(C[i]),
- .DI(AA[i]),
- .S(S[i]),
- .CO_CHAIN(CO_CHAIN[i]),
- .CO_FABRIC(CO[i]),
- .O(Y[i])
- );
- end
- end endgenerate
-
- generate for (i = Y_WIDTH-1; i < Y_WIDTH; i = i + 1) begin:slice
- if(i % 4 == 0) begin
- CARRY0 top_of_carry (
- .CI(C[i]),
- .DI(AA[i]),
- .S(S[i]),
- .CO_CHAIN(CO_CHAIN[i]),
- .O(Y[i])
- );
- end
- else
- begin
- CARRY top_of_carry (
- .CI(C[i]),
- .DI(AA[i]),
- .S(S[i]),
- .CO_CHAIN(CO_CHAIN[i]),
- .O(Y[i])
- );
- end
- // Turns out CO_FABRIC and O both use [ABCD]MUX, so provide
- // a non-congested path to output the top of the carry chain.
- // Registering the output of the CARRY block would solve this, but not
- // all designs do that.
- if((i+1) % 4 == 0) begin
- CARRY0 carry_output (
- .CI(CO_CHAIN[i]),
- .DI(0),
- .S(0),
- .O(CO[i])
- );
- end
- else
- begin
- CARRY carry_output (
- .CI(CO_CHAIN[i]),
- .DI(0),
- .S(0),
- .O(CO[i])
- );
- end
- end endgenerate
-
end else begin
localparam CARRY4_COUNT = (Y_WIDTH + 3) / 4;
diff --git a/techlibs/xilinx/cells_sim.v b/techlibs/xilinx/cells_sim.v
index f5850d8a2..a04587e87 100644
--- a/techlibs/xilinx/cells_sim.v
+++ b/techlibs/xilinx/cells_sim.v
@@ -455,29 +455,6 @@ module CARRY8(
assign CO[7] = S[7] ? CO[6] : DI[7];
endmodule
-`ifdef _EXPLICIT_CARRY
-
-module CARRY0(output CO_CHAIN, CO_FABRIC, O, input CI, CI_INIT, DI, S);
- parameter CYINIT_FABRIC = 0;
- wire CI_COMBINE;
- if(CYINIT_FABRIC) begin
- assign CI_COMBINE = CI_INIT;
- end else begin
- assign CI_COMBINE = CI;
- end
- assign CO_CHAIN = S ? CI_COMBINE : DI;
- assign CO_FABRIC = S ? CI_COMBINE : DI;
- assign O = S ^ CI_COMBINE;
-endmodule
-
-module CARRY(output CO_CHAIN, CO_FABRIC, O, input CI, DI, S);
- assign CO_CHAIN = S ? CI : DI;
- assign CO_FABRIC = S ? CI : DI;
- assign O = S ^ CI;
-endmodule
-
-`endif
-
module ORCY (output O, input CI, I);
assign O = CI | I;
endmodule
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 421602e62..0adec57a2 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -77,10 +77,6 @@ struct SynthXilinxPass : public ScriptPass
log(" write the design to the specified BLIF file. writing of an output file\n");
log(" is omitted if this parameter is not specified.\n");
log("\n");
- log(" -vpr\n");
- log(" generate an output netlist (and BLIF file) suitable for VPR\n");
- log(" (this feature is experimental and incomplete)\n");
- log("\n");
log(" -ise\n");
log(" generate an output netlist suitable for ISE\n");
log("\n");
@@ -142,7 +138,7 @@ struct SynthXilinxPass : public ScriptPass
}
std::string top_opt, edif_file, blif_file, family;
- bool flatten, retime, vpr, ise, noiopad, noclkbuf, nobram, nolutram, nosrl, nocarry, nowidelut, nodsp, uram;
+ bool flatten, retime, ise, noiopad, noclkbuf, nobram, nolutram, nosrl, nocarry, nowidelut, nodsp, uram;
bool abc9, dff;
bool flatten_before_abc;
int widemux;
@@ -157,7 +153,6 @@ struct SynthXilinxPass : public ScriptPass
family = "xc7";
flatten = false;
retime = false;
- vpr = false;
ise = false;
noiopad = false;
noclkbuf = false;
@@ -229,10 +224,6 @@ struct SynthXilinxPass : public ScriptPass
nowidelut = true;
continue;
}
- if (args[argidx] == "-vpr") {
- vpr = true;
- continue;
- }
if (args[argidx] == "-ise") {
ise = true;
continue;
@@ -345,8 +336,6 @@ struct SynthXilinxPass : public ScriptPass
if (check_label("begin")) {
std::string read_args;
- if (vpr)
- read_args += " -D_EXPLICIT_CARRY";
read_args += " -lib -specify +/xilinx/cells_sim.v";
run("read_verilog" + read_args);
@@ -368,6 +357,8 @@ struct SynthXilinxPass : public ScriptPass
run("opt_expr");
run("opt_clean");
run("check");
+ run("opt -nodffe -nosdff");
+ run("fsm");
run("opt");
if (help_mode)
run("wreduce [-keepdc]", "(option for '-widemux')");
@@ -455,8 +446,6 @@ struct SynthXilinxPass : public ScriptPass
run("alumacc");
run("share");
run("opt");
- run("fsm");
- run("opt -fast");
run("memory -nomap");
run("opt_clean");
}
@@ -515,28 +504,21 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("map_ffram")) {
- // Required for dff2dffs to work.
- run("simplemap t:$dff t:$adff t:$mux");
- // Needs to be done before opt -mux_bool happens.
- if (help_mode)
- run("dff2dffs [-match-init]", "(-match-init for xc6s only)");
- else if (family == "xc6s")
- run("dff2dffs -match-init");
- else
- run("dff2dffs");
- if (widemux > 0)
+ if (widemux > 0) {
run("opt -fast -mux_bool -undriven -fine"); // Necessary to omit -mux_undef otherwise muxcover
// performs less efficiently
- else
+ } else {
run("opt -fast -full");
+ }
run("memory_map");
}
if (check_label("fine")) {
- run("dff2dffe -direct-match $_DFF_* -direct-match $_SDFF_*");
- if (help_mode)
- run("muxcover <internal options> ('-widemux' only)");
- else if (widemux > 0) {
+ if (help_mode) {
+ run("simplemap t:$mux", "('-widemux' only)");
+ run("muxcover <internal options>", "('-widemux' only)");
+ } else if (widemux > 0) {
+ run("simplemap t:$mux");
constexpr int cost_mux2 = 100;
std::string muxcover_args = stringf(" -nodecode -mux2=%d", cost_mux2);
switch (widemux) {
@@ -570,8 +552,6 @@ struct SynthXilinxPass : public ScriptPass
techmap_args += stringf(" -D MIN_MUX_INPUTS=%d -map +/xilinx/mux_map.v", widemux);
if (!nocarry) {
techmap_args += " -map +/xilinx/arith_map.v";
- if (vpr)
- techmap_args += " -D _EXPLICIT_CARRY";
}
run("techmap " + techmap_args);
run("opt -fast");
@@ -603,7 +583,7 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("map_luts")) {
- run("opt_expr -mux_undef");
+ run("opt_expr -mux_undef -noclkinv");
if (flatten_before_abc)
run("flatten");
if (help_mode)
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-27 17:27:58 +0000