From 1ec6429bad4d793b389ee594b1cb2575bf73ddaf Mon Sep 17 00:00:00 2001 From: Clifford Wolf Date: Sat, 7 Nov 2015 19:10:43 +0100 Subject: [PATCH] Added "singleton" pass --- passes/hierarchy/Makefile.inc | 1 + passes/hierarchy/singleton.cc | 101 ++++++++++++++++++++++++++++++++++ 2 files changed, 102 insertions(+) create mode 100644 passes/hierarchy/singleton.cc diff --git a/passes/hierarchy/Makefile.inc b/passes/hierarchy/Makefile.inc index 99aa1e116..1fb669c11 100644 --- a/passes/hierarchy/Makefile.inc +++ b/passes/hierarchy/Makefile.inc @@ -1,4 +1,5 @@ OBJS += passes/hierarchy/hierarchy.o +OBJS += passes/hierarchy/singleton.o OBJS += passes/hierarchy/submod.o diff --git a/passes/hierarchy/singleton.cc b/passes/hierarchy/singleton.cc new file mode 100644 index 000000000..5715c0eb1 --- /dev/null +++ b/passes/hierarchy/singleton.cc @@ -0,0 +1,101 @@ +/* + * 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" + +USING_YOSYS_NAMESPACE +PRIVATE_NAMESPACE_BEGIN + +struct SingletonPass : public Pass { + SingletonPass() : Pass("singleton", "create singleton modules") { } + virtual void help() + { + // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| + log("\n"); + log(" singleton [selection]\n"); + log("\n"); + log("By default, a module that is instantiated by several other modules is only\n"); + log("kept once in the design. This preserves the original modularity of the design\n"); + log("and reduces the overall size of the design in memory. But it prevents certain\n"); + log("optimizations and other operations on the design. This pass creates singleton\n"); + log("modules for all selected cells. The created modules are marked with the\n"); + log("'singleton' attribute.\n"); + log("\n"); + log("This commands only operates on modules that by themself have the 'singleton'\n"); + log("attribute set (the 'top' module is a singleton implicitly).\n"); + log("\n"); + } + virtual void execute(std::vector args, RTLIL::Design *design) + { + log_header("Executing SINGLETON pass (creating singleton modules).\n"); + + size_t argidx; + for (argidx = 1; argidx < args.size(); argidx++) + { + // if (args[argidx] == "-check") { + // flag_check = true; + // continue; + // } + } + extra_args(args, argidx, design); + + bool did_something = true; + int singleton_cnt = 0; + + while (did_something) + { + did_something = false; + + for (auto module : design->selected_modules()) + { + if (!module->get_bool_attribute("\\singleton") && !module->get_bool_attribute("\\top")) + continue; + + for (auto cell : module->selected_cells()) + { + auto tmod = design->module(cell->type); + + if (tmod == nullptr) + continue; + + if (tmod->get_bool_attribute("\\blackbox")) + continue; + + if (tmod->get_bool_attribute("\\singleton")) + continue; + + cell->type = module->name.str() + "." + log_id(cell->name); + log("Creating singleton '%s'.\n", log_id(cell->type)); + + auto smod = tmod->clone(); + smod->name = cell->type; + smod->set_bool_attribute("\\singleton"); + design->add(smod); + + did_something = true; + singleton_cnt++; + } + } + } + + log("Created %d singleton modules.\n", singleton_cnt); + } +} SingletonPass; + +PRIVATE_NAMESPACE_END -- 2.30.2