diff --git a/passes/pmgen/Makefile.inc b/passes/pmgen/Makefile.inc index 7911132db..c03606152 100644 --- a/passes/pmgen/Makefile.inc +++ b/passes/pmgen/Makefile.inc @@ -1,4 +1,5 @@ OBJS += passes/pmgen/ice40_dsp.o +OBJS += passes/pmgen/ice40_wrapcarry.o OBJS += passes/pmgen/peepopt.o # -------------------------------------- @@ -12,6 +13,15 @@ passes/pmgen/ice40_dsp_pm.h: passes/pmgen/pmgen.py passes/pmgen/ice40_dsp.pmg # -------------------------------------- +passes/pmgen/ice40_wrapcarry.o: passes/pmgen/ice40_wrapcarry_pm.h +EXTRA_OBJS += passes/pmgen/ice40_wrapcarry_pm.h +.SECONDARY: passes/pmgen/ice40_wrapcarry_pm.h + +passes/pmgen/ice40_wrapcarry_pm.h: passes/pmgen/pmgen.py passes/pmgen/ice40_wrapcarry.pmg + $(P) mkdir -p passes/pmgen && python3 $< -o $@ -p ice40_wrapcarry $(filter-out $<,$^) + +# -------------------------------------- + passes/pmgen/peepopt.o: passes/pmgen/peepopt_pm.h EXTRA_OBJS += passes/pmgen/peepopt_pm.h .SECONDARY: passes/pmgen/peepopt_pm.h diff --git a/passes/pmgen/ice40_wrapcarry.cc b/passes/pmgen/ice40_wrapcarry.cc new file mode 100644 index 000000000..69ef3cd82 --- /dev/null +++ b/passes/pmgen/ice40_wrapcarry.cc @@ -0,0 +1,90 @@ +/* + * yosys -- Yosys Open SYnthesis Suite + * + * Copyright (C) 2012 Clifford Wolf + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + +#include "kernel/yosys.h" +#include "kernel/sigtools.h" + +USING_YOSYS_NAMESPACE +PRIVATE_NAMESPACE_BEGIN + +#include "passes/pmgen/ice40_wrapcarry_pm.h" + +void create_ice40_wrapcarry(ice40_wrapcarry_pm &pm) +{ + auto &st = pm.st_ice40_wrapcarry; + +#if 0 + log("\n"); + log("carry: %s\n", log_id(st.carry, "--")); + log("lut: %s\n", log_id(st.lut, "--")); +#endif + + log(" replacing SB_LUT + SB_CARRY with $__ICE40_CARRY_WRAPPER cell.\n"); + + Cell *cell = pm.module->addCell(NEW_ID, "$__ICE40_CARRY_WRAPPER"); + pm.module->swap_names(cell, st.carry); + + cell->setPort("\\A", st.carry->getPort("\\I0")); + cell->setPort("\\B", st.carry->getPort("\\I1")); + cell->setPort("\\CI", st.carry->getPort("\\CI")); + cell->setPort("\\CO", st.carry->getPort("\\CO")); + + cell->setPort("\\I0", st.lut->getPort("\\I0")); + cell->setPort("\\I3", st.lut->getPort("\\I3")); + cell->setPort("\\O", st.lut->getPort("\\O")); + cell->setParam("\\LUT", st.lut->getParam("\\LUT_INIT")); + + pm.autoremove(st.carry); + pm.autoremove(st.lut); +} + +struct Ice40WrapCarryPass : public Pass { + Ice40WrapCarryPass() : Pass("ice40_wrapcarry", "iCE40: wrap carries") { } + void help() YS_OVERRIDE + { + // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| + log("\n"); + log(" ice40_wrapcarry [selection]\n"); + log("\n"); + log("Wrap manually instantiated SB_CARRY cells, along with their associated SB_LUTs,\n"); + log("into an internal $__ICE40_CARRY_WRAPPER cell for preservation across technology\n"); + log("mapping."); + log("\n"); + } + void execute(std::vector args, RTLIL::Design *design) YS_OVERRIDE + { + log_header(design, "Executing ICE40_WRAPCARRY pass (wrap carries).\n"); + + size_t argidx; + for (argidx = 1; argidx < args.size(); argidx++) + { + // if (args[argidx] == "-singleton") { + // singleton_mode = true; + // continue; + // } + break; + } + extra_args(args, argidx, design); + + for (auto module : design->selected_modules()) + ice40_wrapcarry_pm(module, module->selected_cells()).run_ice40_wrapcarry(create_ice40_wrapcarry); + } +} Ice40WrapCarryPass; + +PRIVATE_NAMESPACE_END diff --git a/passes/pmgen/ice40_wrapcarry.pmg b/passes/pmgen/ice40_wrapcarry.pmg new file mode 100644 index 000000000..9e64c7467 --- /dev/null +++ b/passes/pmgen/ice40_wrapcarry.pmg @@ -0,0 +1,11 @@ +pattern ice40_wrapcarry + +match carry + select carry->type.in(\SB_CARRY) +endmatch + +match lut + select lut->type.in(\SB_LUT4) + index port(lut, \I1) === port(carry, \I0) + index port(lut, \I2) === port(carry, \I1) +endmatch diff --git a/techlibs/ice40/arith_map.v b/techlibs/ice40/arith_map.v index 65f28c585..26b24db9e 100644 --- a/techlibs/ice40/arith_map.v +++ b/techlibs/ice40/arith_map.v @@ -44,10 +44,18 @@ module _80_ice40_alu (A, B, CI, BI, X, Y, CO); genvar i; generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice - \$__ICE40_FULL_ADDER carry ( + \$__ICE40_CARRY_WRAPPER #( + // A[0]: 1010 1010 1010 1010 + // A[1]: 1100 1100 1100 1100 + // A[2]: 1111 0000 1111 0000 + // A[3]: 1111 1111 0000 0000 + .LUT(16'b 0110_1001_1001_0110) + ) fadd ( .A(AA[i]), .B(BB[i]), .CI(C[i]), + .I0(1'b0), + .I3(C[i]), .CO(CO[i]), .O(Y[i]) ); diff --git a/techlibs/ice40/cells_map.v b/techlibs/ice40/cells_map.v index 511b7f6c6..0c10c9ac4 100644 --- a/techlibs/ice40/cells_map.v +++ b/techlibs/ice40/cells_map.v @@ -63,7 +63,8 @@ endmodule `endif `ifndef NO_ADDER -module \$__ICE40_FULL_ADDER (output CO, O, input A, B, CI); +module \$__ICE40_CARRY_WRAPPER (output CO, O, input A, B, CI, I0, I3); + parameter LUT = 0; SB_CARRY carry ( .I0(A), .I1(B), @@ -72,13 +73,9 @@ module \$__ICE40_FULL_ADDER (output CO, O, input A, B, CI); ); \$lut #( .WIDTH(4), - // A[0]: 1010 1010 1010 1010 - // A[1]: 1100 1100 1100 1100 - // A[2]: 1111 0000 1111 0000 - // A[3]: 1111 1111 0000 0000 - .LUT(16'b 0110_1001_1001_0110) - ) adder ( - .A({CI,B,A,1'b0}), + .LUT(LUT) + ) lut ( + .A({I3,B,A,I0}), .Y(O) ); endmodule diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc index 93d5dcbd4..8f4a0f377 100644 --- a/techlibs/ice40/synth_ice40.cc +++ b/techlibs/ice40/synth_ice40.cc @@ -293,8 +293,10 @@ struct SynthIce40Pass : public ScriptPass { if (nocarry) run("techmap"); - else + else { + run("ice40_wrapcarry"); run("techmap -map +/techmap.v -map +/ice40/arith_map.v"); + } if (retime || help_mode) run(abc + " -dff", "(only if -retime)"); run("ice40_opt");