diff options
Diffstat (limited to 'techlibs')
| -rw-r--r-- | techlibs/common/synth.cc | 15 | ||||
| -rw-r--r-- | techlibs/intel/synth_intel.cc | 3 | ||||
| -rw-r--r-- | techlibs/xilinx/cells_map.v | 44 |
3 files changed, 41 insertions, 21 deletions
diff --git a/techlibs/common/synth.cc b/techlibs/common/synth.cc index 555de9fba..af70cc498 100644 --- a/techlibs/common/synth.cc +++ b/techlibs/common/synth.cc @@ -78,6 +78,9 @@ struct SynthPass : public ScriptPass log(" -abc9\n"); log(" use new ABC9 flow (EXPERIMENTAL)\n"); log("\n"); + log(" -keepdc\n"); + log(" do not optimize explicit don't-care values on $mux cells.\n"); + log("\n"); log("\n"); log("The following commands are executed by this synthesis command:\n"); help_script(); @@ -85,7 +88,7 @@ struct SynthPass : public ScriptPass } string top_module, fsm_opts, memory_opts, abc; - bool autotop, flatten, noalumacc, nofsm, noabc, noshare; + bool autotop, flatten, noalumacc, nofsm, noabc, noshare, keepdc; int lut; void clear_flags() YS_OVERRIDE @@ -102,6 +105,7 @@ struct SynthPass : public ScriptPass noabc = false; noshare = false; abc = "abc"; + keepdc = false; } void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE @@ -167,6 +171,10 @@ struct SynthPass : public ScriptPass abc = "abc9"; continue; } + if (args[argidx] == "-keepdc") { + keepdc = true; + continue; + } break; } extra_args(args, argidx, design); @@ -211,7 +219,10 @@ struct SynthPass : public ScriptPass run("opt_clean"); run("check"); run("opt"); - run("wreduce"); + if (help_mode) + run("wreduce [-keepdc]"); + else + run("wreduce" + std::string(keepdc ? " -keepdc" : "")); run("peepopt"); run("opt_clean"); if (help_mode) diff --git a/techlibs/intel/synth_intel.cc b/techlibs/intel/synth_intel.cc index 639cba2c2..09c9ba3af 100644 --- a/techlibs/intel/synth_intel.cc +++ b/techlibs/intel/synth_intel.cc @@ -48,6 +48,8 @@ struct SynthIntelPass : public ScriptPass { log(" -vqm <file>\n"); log(" write the design to the specified Verilog Quartus Mapping File. Writing of an\n"); log(" output file is omitted if this parameter is not specified.\n"); + log(" Note that this backend has not been tested and is likely incompatible\n"); + log(" with recent versions of Quartus.\n"); log("\n"); log(" -vpr <file>\n"); log(" write BLIF files for VPR flow experiments. The synthesized BLIF output file is not\n"); @@ -108,6 +110,7 @@ struct SynthIntelPass : public ScriptPass { } if (args[argidx] == "-vqm" && argidx + 1 < args.size()) { vout_file = args[++argidx]; + log_warning("The Quartus backend has not been tested recently and is likely incompatible with modern versions of Quartus.\n"); continue; } if (args[argidx] == "-vpr" && argidx + 1 < args.size()) { diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v index 9a316fc96..89671c0fc 100644 --- a/techlibs/xilinx/cells_map.v +++ b/techlibs/xilinx/cells_map.v @@ -56,7 +56,6 @@ module \$__XILINX_SHREG_ (input C, input D, input [31:0] L, input E, output Q, o localparam [DEPTH-1:0] INIT_R = brev(INIT); parameter _TECHMAP_CONSTMSK_L_ = 0; - parameter _TECHMAP_CONSTVAL_L_ = 0; wire CE; generate @@ -129,26 +128,33 @@ module \$__XILINX_SHREG_ (input C, input D, input [31:0] L, input E, output Q, o MUXF8 fpga_mux_2 (.O(Q), .I0(T7), .I1(T8), .S(L[6])); end end - else if (DEPTH <= 129 && ~&_TECHMAP_CONSTMSK_L_) begin - // Handle cases where fixed-length depth is - // just 1 over a convenient value - \$__XILINX_SHREG_ #(.DEPTH(DEPTH+1), .INIT({INIT,1'b0}), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) _TECHMAP_REPLACE_ (.C(C), .D(D), .L(L), .E(E), .Q(Q)); + // For fixed length, if just 1 over a convenient value, decompose + else if (DEPTH <= 129 && &_TECHMAP_CONSTMSK_L_) begin + wire T; + \$__XILINX_SHREG_ #(.DEPTH(DEPTH-1), .INIT(INIT[DEPTH-1:1]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl (.C(C), .D(D), .L({32{1'b1}}), .E(E), .Q(T)); + \$__XILINX_SHREG_ #(.DEPTH(1), .INIT(INIT[0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_last (.C(C), .D(T), .L(L), .E(E), .Q(Q)); end + // For variable length, if just 1 over a convenient value, then bump up one more + else if (DEPTH < 129 && ~&_TECHMAP_CONSTMSK_L_) + \$__XILINX_SHREG_ #(.DEPTH(DEPTH+1), .INIT({INIT,1'b0}), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) _TECHMAP_REPLACE_ (.C(C), .D(D), .L(L), .E(E), .Q(Q)); else begin - localparam lower_clog2 = $clog2((DEPTH+1)/2); - localparam lower_depth = 2 ** lower_clog2; - wire T0, T1, T2, T3; - if (&_TECHMAP_CONSTMSK_L_) begin - \$__XILINX_SHREG_ #(.DEPTH(lower_depth), .INIT(INIT[DEPTH-1:DEPTH-lower_depth]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .L(lower_depth-1), .E(E), .Q(T0)); - \$__XILINX_SHREG_ #(.DEPTH(DEPTH-lower_depth), .INIT(INIT[DEPTH-lower_depth-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .L(DEPTH-lower_depth-1), .E(E), .Q(Q), .SO(T3)); - end - else begin - \$__XILINX_SHREG_ #(.DEPTH(lower_depth), .INIT(INIT[DEPTH-1:DEPTH-lower_depth]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .L(L[lower_clog2-1:0]), .E(E), .Q(T0), .SO(T1)); - \$__XILINX_SHREG_ #(.DEPTH(DEPTH-lower_depth), .INIT(INIT[DEPTH-lower_depth-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T1), .L(L[lower_clog2-1:0]), .E(E), .Q(T2), .SO(T3)); - assign Q = L[lower_clog2] ? T2 : T0; - end - if (DEPTH == 2 * lower_depth) - assign SO = T3; + localparam depth0 = 128; + localparam num_srl128 = DEPTH / depth0; + localparam depthN = DEPTH % depth0; + wire [num_srl128 + (depthN > 0 ? 1 : 0) - 1:0] T; + wire [num_srl128 + (depthN > 0 ? 1 : 0) :0] S; + assign S[0] = D; + genvar i; + for (i = 0; i < num_srl128; i++) + \$__XILINX_SHREG_ #(.DEPTH(depth0), .INIT(INIT[DEPTH-1-i*depth0-:depth0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl (.C(C), .D(S[i]), .L(L[$clog2(depth0)-1:0]), .E(E), .Q(T[i]), .SO(S[i+1])); + + if (depthN > 0) + \$__XILINX_SHREG_ #(.DEPTH(depthN), .INIT(INIT[depthN-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_last (.C(C), .D(S[num_srl128]), .L(L[$clog2(depth0)-1:0]), .E(E), .Q(T[num_srl128])); + + if (&_TECHMAP_CONSTMSK_L_) + assign Q = T[num_srl128 + (depthN > 0 ? 1 : 0) - 1]; + else + assign Q = T[L[DEPTH-1:$clog2(depth0)]]; end endgenerate endmodule |