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Merge branch 'master' of https://github.com/cliffordwolf/yosys

This commit is contained in:
Ahmed Irfan 2014-01-18 18:10:31 +01:00
parent 66198d8591 bef17eeb10
commit 1dd797ab09
13 changed files with 451 additions and 12 deletions
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66
frontends/verilog/verilog_frontend.cc
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@ -38,6 +38,9 @@ using namespace VERILOG_FRONTEND;
// use the Verilog bison/flex parser to generate an AST and use AST::process() to convert it to RTLIL // use the Verilog bison/flex parser to generate an AST and use AST::process() to convert it to RTLIL
static std::vector<std::string> verilog_defaults;
static std::list<std::vector<std::string>> verilog_defaults_stack;
struct VerilogFrontend : public Frontend { struct VerilogFrontend : public Frontend {
VerilogFrontend() : Frontend("verilog", "read modules from verilog file") { } VerilogFrontend() : Frontend("verilog", "read modules from verilog file") { }
virtual void help() virtual void help()
@ -108,6 +111,9 @@ struct VerilogFrontend : public Frontend {
log(" add 'dir' to the directories which are used when searching include\n"); log(" add 'dir' to the directories which are used when searching include\n");
log(" files\n"); log(" files\n");
log("\n"); log("\n");
log("The command 'verilog_defaults' can be used to register default options for\n");
log("subsequent calls to 'read_verilog'.\n");
log("\n");
} }
virtual void execute(FILE *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) virtual void execute(FILE *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
{ {
@ -128,6 +134,8 @@ struct VerilogFrontend : public Frontend {
log_header("Executing Verilog-2005 frontend.\n"); log_header("Executing Verilog-2005 frontend.\n");
args.insert(args.begin()+1, verilog_defaults.begin(), verilog_defaults.end());
size_t argidx; size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) { for (argidx = 1; argidx < args.size(); argidx++) {
std::string arg = args[argidx]; std::string arg = args[argidx];
@ -248,3 +256,61 @@ void frontend_verilog_yyerror(char const *fmt, ...)
exit(1); exit(1);
} }
struct VerilogDefaults : public Pass {
VerilogDefaults() : Pass("verilog_defaults", "set default options for read_verilog") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" verilog_defaults -add [options]\n");
log("\n");
log("Add the sepcified options to the list of default options to read_verilog.\n");
log("\n");
log("\n");
log(" verilog_defaults -clear");
log("\n");
log("Clear the list of verilog default options.\n");
log("\n");
log("\n");
log(" verilog_defaults -push");
log(" verilog_defaults -pop");
log("\n");
log("Push or pop the list of default options to a stack. Note that -push does\n");
log("not imply -clear.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design*)
{
if (args.size() == 0)
cmd_error(args, 1, "Missing argument.");
if (args[1] == "-add") {
verilog_defaults.insert(verilog_defaults.end(), args.begin()+2, args.end());
return;
}
if (args.size() != 2)
cmd_error(args, 2, "Extra argument.");
if (args[1] == "-clear") {
verilog_defaults.clear();
return;
}
if (args[1] == "-push") {
verilog_defaults_stack.push_back(verilog_defaults);
return;
}
if (args[1] == "-pop") {
if (verilog_defaults_stack.empty()) {
verilog_defaults.clear();
} else {
verilog_defaults.swap(verilog_defaults_stack.back());
verilog_defaults_stack.pop_back();
}
return;
}
}
} VerilogDefaults;

7
kernel/log.h
View File

@ -95,11 +95,16 @@ struct PerformanceTimer
// simple API for quickly dumping values when debugging // simple API for quickly dumping values when debugging
static inline void log_dump_val_worker(short v) { log("%d", v); }
static inline void log_dump_val_worker(unsigned short v) { log("%u", v); }
static inline void log_dump_val_worker(int v) { log("%d", v); } static inline void log_dump_val_worker(int v) { log("%d", v); }
static inline void log_dump_val_worker(size_t v) { log("%zd", v); } static inline void log_dump_val_worker(unsigned int v) { log("%u", v); }
static inline void log_dump_val_worker(long int v) { log("%ld", v); } static inline void log_dump_val_worker(long int v) { log("%ld", v); }
static inline void log_dump_val_worker(unsigned long int v) { log("%lu", v); }
static inline void log_dump_val_worker(long long int v) { log("%lld", v); } static inline void log_dump_val_worker(long long int v) { log("%lld", v); }
static inline void log_dump_val_worker(unsigned long long int v) { log("%lld", v); }
static inline void log_dump_val_worker(char c) { log(c >= 32 && c < 127 ? "'%c'" : "'\\x%02x'", c); } static inline void log_dump_val_worker(char c) { log(c >= 32 && c < 127 ? "'%c'" : "'\\x%02x'", c); }
static inline void log_dump_val_worker(unsigned char c) { log(c >= 32 && c < 127 ? "'%c'" : "'\\x%02x'", c); }
static inline void log_dump_val_worker(bool v) { log("%s", v ? "true" : "false"); } static inline void log_dump_val_worker(bool v) { log("%s", v ? "true" : "false"); }
static inline void log_dump_val_worker(double v) { log("%f", v); } static inline void log_dump_val_worker(double v) { log("%f", v); }
static inline void log_dump_val_worker(const char *v) { log("%s", v); } static inline void log_dump_val_worker(const char *v) { log("%s", v); }

3
kernel/rtlil.h
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@ -227,6 +227,9 @@ struct RTLIL::Selection {
if (!full_selection && selected_modules.count(module->name) == 0) if (!full_selection && selected_modules.count(module->name) == 0)
selected_members[module->name].insert(member->name); selected_members[module->name].insert(member->name);
} }
bool empty() const {
return !full_selection && selected_modules.empty() && selected_members.empty();
}
}; };
struct RTLIL::Design { struct RTLIL::Design {

1
passes/cmds/Makefile.inc
View File

@ -6,6 +6,7 @@ OBJS += passes/cmds/show.o
OBJS += passes/cmds/rename.o OBJS += passes/cmds/rename.o
OBJS += passes/cmds/connect.o OBJS += passes/cmds/connect.o
OBJS += passes/cmds/scatter.o OBJS += passes/cmds/scatter.o
OBJS += passes/cmds/setundef.o
OBJS += passes/cmds/splitnets.o OBJS += passes/cmds/splitnets.o
OBJS += passes/cmds/stat.o OBJS += passes/cmds/stat.o

51
passes/cmds/select.cc
View File

@ -656,6 +656,7 @@ struct SelectPass : public Pass {
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n"); log("\n");
log(" select [ -add | -del | -set <name> ] <selection>\n"); log(" select [ -add | -del | -set <name> ] <selection>\n");
log(" select [ -assert-none | -assert-any ] <selection>\n");
log(" select [ -list | -write <filename> | -count | -clear ]\n"); log(" select [ -list | -write <filename> | -count | -clear ]\n");
log(" select -module <modname>\n"); log(" select -module <modname>\n");
log("\n"); log("\n");
@ -676,6 +677,14 @@ struct SelectPass : public Pass {
log(" do not modify the current selection. instead save the new selection\n"); log(" do not modify the current selection. instead save the new selection\n");
log(" under the given name (see @<name> below).\n"); log(" under the given name (see @<name> below).\n");
log("\n"); log("\n");
log(" -assert-none\n");
log(" asserts that the given selection is empty. i.e. produce an error if\n");
log(" any object matching the selection is found.\n");
log("\n");
log(" -assert-any\n");
log(" asserts that the given selection is non-empty. i.e. produce an error\n");
log(" if no object matching the selection is found.\n");
log("\n");
log(" -list\n"); log(" -list\n");
log(" list all objects in the current selection\n"); log(" list all objects in the current selection\n");
log("\n"); log("\n");
@ -802,6 +811,8 @@ struct SelectPass : public Pass {
bool list_mode = false; bool list_mode = false;
bool count_mode = false; bool count_mode = false;
bool got_module = false; bool got_module = false;
bool assert_none = false;
bool assert_any = false;
std::string write_file; std::string write_file;
std::string set_name; std::string set_name;
@ -819,6 +830,14 @@ struct SelectPass : public Pass {
del_mode = true; del_mode = true;
continue; continue;
} }
if (arg == "-assert-none") {
assert_none = true;
continue;
}
if (arg == "-assert-any") {
assert_any = true;
continue;
}
if (arg == "-clear") { if (arg == "-clear") {
clear_mode = true; clear_mode = true;
continue; continue;
@ -853,16 +872,16 @@ struct SelectPass : public Pass {
} }
if (clear_mode && args.size() != 2) if (clear_mode && args.size() != 2)
log_cmd_error("Option -clear can not be combined with other options.\n"); log_cmd_error("Option -clear can not be combined with any other options.\n");
if (add_mode && del_mode) if (add_mode + del_mode + assert_none + assert_any > 1)
log_cmd_error("Options -add and -del can not be combined.\n"); log_cmd_error("Options -add, -del, -assert-none or -assert-any can not be combined.\n");
if ((list_mode || !write_file.empty() || count_mode) && (add_mode || del_mode)) if ((list_mode || !write_file.empty() || count_mode) && (add_mode || del_mode || assert_none || assert_any))
log_cmd_error("Options -list, -write and -count can not be combined with -add or -del.\n"); log_cmd_error("Options -list, -write and -count can not be combined with -add, -del, -assert-none or -assert-any.\n");
if (!set_name.empty() && (list_mode || !write_file.empty() || count_mode || add_mode || del_mode)) if (!set_name.empty() && (list_mode || !write_file.empty() || count_mode || add_mode || del_mode || assert_none || assert_any))
log_cmd_error("Option -set can not be combined with -list, -write, -count, -add or -del.\n"); log_cmd_error("Option -set can not be combined with -list, -write, -count, -add, -del, -assert-none or -assert-any.\n");
if (work_stack.size() == 0 && got_module) { if (work_stack.size() == 0 && got_module) {
RTLIL::Selection sel; RTLIL::Selection sel;
@ -943,6 +962,24 @@ struct SelectPass : public Pass {
return; return;
} }
if (assert_none)
{
if (work_stack.size() == 0)
log_cmd_error("No selection to check.\n");
if (!work_stack.back().empty())
log_error("Assertation failed: selection is not empty.\n");
return;
}
if (assert_any)
{
if (work_stack.size() == 0)
log_cmd_error("No selection to check.\n");
if (work_stack.back().empty())
log_error("Assertation failed: selection is empty.\n");
return;
}
if (!set_name.empty()) if (!set_name.empty())
{ {
if (work_stack.size() == 0) if (work_stack.size() == 0)

157
passes/cmds/setundef.cc Normal file
View File

@ -0,0 +1,157 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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/register.h"
#include "kernel/celltypes.h"
#include "kernel/sigtools.h"
#include "kernel/rtlil.h"
#include "kernel/log.h"
static int next_bit_mode;
static uint32_t next_bit_state;
static RTLIL::State next_bit()
{
if (next_bit_mode == 0)
return RTLIL::State::S0;
if (next_bit_mode == 1)
return RTLIL::State::S1;
// xorshift32
next_bit_state ^= next_bit_state << 13;
next_bit_state ^= next_bit_state >> 17;
next_bit_state ^= next_bit_state << 5;
log_assert(next_bit_state != 0);
return ((next_bit_state >> (next_bit_state & 15)) & 16) ? RTLIL::State::S0 : RTLIL::State::S1;
}
struct SetundefWorker
{
void operator()(RTLIL::SigSpec &sig)
{
sig.expand();
for (auto &c : sig.chunks)
if (c.wire == NULL && c.data.bits.at(0) > RTLIL::State::S1)
c.data.bits.at(0) = next_bit();
sig.optimize();
}
};
struct SetundefPass : public Pass {
SetundefPass() : Pass("setundef", "replace undef values with defined constants") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" setundef [options] [selection]\n");
log("\n");
log("This command replaced undef (x) constants with defined (0/1) constants.\n");
log("\n");
log(" -undriven\n");
log(" also set undriven nets to constant values\n");
log("\n");
log(" -zero\n");
log(" replace with bits cleared (0)\n");
log("\n");
log(" -one\n");
log(" replace with bits set (1)\n");
log("\n");
log(" -random <seed>\n");
log(" replace with random bits using the specified integer als seed\n");
log(" value for the random number generator.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
bool got_value = false;
bool undriven_mode = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-undriven") {
undriven_mode = true;
continue;
}
if (args[argidx] == "-zero") {
got_value = true;
next_bit_mode = 0;
continue;
}
if (args[argidx] == "-one") {
got_value = true;
next_bit_mode = 1;
continue;
}
if (args[argidx] == "-random" && !got_value && argidx+1 < args.size()) {
got_value = true;
next_bit_mode = 2;
next_bit_state = atoi(args[++argidx].c_str()) + 1;
for (int i = 0; i < 10; i++)
next_bit();
continue;
}
break;
}
extra_args(args, argidx, design);
if (!got_value)
log_cmd_error("One of the options -zero, -one, or -random <seed> must be specified.\n");
for (auto &mod_it : design->modules)
{
RTLIL::Module *module = mod_it.second;
if (!design->selected(module))
continue;
if (undriven_mode)
{
if (!module->processes.empty())
log_error("The 'setundef' command can't operate in -undriven mode on modules with processes. Run 'proc' first.\n");
SigMap sigmap(module);
SigPool undriven_signals;
for (auto &it : module->wires)
if (!it.second->port_input)
undriven_signals.add(sigmap(it.second));
CellTypes ct(design);
for (auto &it : module->cells)
for (auto &conn : it.second->connections)
if (!ct.cell_known(it.second->type) || ct.cell_output(it.second->type, conn.first))
undriven_signals.del(sigmap(conn.second));
RTLIL::SigSpec sig = undriven_signals.export_all();
for (auto &c : sig.chunks) {
RTLIL::SigSpec bits;
for (int i = 0; i < c.width; i++)
bits.append(next_bit());
bits.optimize();
module->connections.push_back(RTLIL::SigSig(c, bits));
}
}
module->rewrite_sigspecs(SetundefWorker());
}
}
} SetundefPass;

1
passes/memory/Makefile.inc
View File

@ -2,5 +2,6 @@
OBJS += passes/memory/memory.o OBJS += passes/memory/memory.o
OBJS += passes/memory/memory_dff.o OBJS += passes/memory/memory_dff.o
OBJS += passes/memory/memory_collect.o OBJS += passes/memory/memory_collect.o
OBJS += passes/memory/memory_unpack.o
OBJS += passes/memory/memory_map.o OBJS += passes/memory/memory_map.o

116
passes/memory/memory_unpack.cc Normal file
View File

@ -0,0 +1,116 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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/register.h"
#include "kernel/log.h"
#include <sstream>
#include <algorithm>
#include <stdlib.h>
#include <assert.h>
static void handle_memory(RTLIL::Module *module, RTLIL::Cell *memory)
{
log("Creating $memrd and $memwr for memory `%s' in module `%s':\n",
memory->name.c_str(), module->name.c_str());
RTLIL::IdString mem_name = RTLIL::escape_id(memory->parameters.at("\\MEMID").decode_string());
while (module->memories.count(mem_name) != 0)
mem_name += stringf("_%d", RTLIL::autoidx++);
RTLIL::Memory *mem = new RTLIL::Memory;
mem->name = mem_name;
mem->width = memory->parameters.at("\\WIDTH").as_int();
mem->start_offset = memory->parameters.at("\\OFFSET").as_int();
mem->size = memory->parameters.at("\\SIZE").as_int();
module->memories[mem_name] = mem;
int abits = memory->parameters.at("\\ABITS").as_int();
int num_rd_ports = memory->parameters.at("\\RD_PORTS").as_int();
int num_wr_ports = memory->parameters.at("\\WR_PORTS").as_int();
for (int i = 0; i < num_rd_ports; i++)
{
RTLIL::Cell *cell = new RTLIL::Cell;
cell->name = NEW_ID;
cell->type = "$memrd";
cell->parameters["\\MEMID"] = mem_name;
cell->parameters["\\ABITS"] = memory->parameters.at("\\ABITS");
cell->parameters["\\WIDTH"] = memory->parameters.at("\\WIDTH");
cell->parameters["\\CLK_ENABLE"] = RTLIL::SigSpec(memory->parameters.at("\\RD_CLK_ENABLE")).extract(i, 1).as_const();
cell->parameters["\\CLK_POLARITY"] = RTLIL::SigSpec(memory->parameters.at("\\RD_CLK_POLARITY")).extract(i, 1).as_const();
cell->connections["\\CLK"] = memory->connections.at("\\RD_CLK").extract(i, 1);
cell->connections["\\ADDR"] = memory->connections.at("\\RD_ADDR").extract(i*abits, abits);
cell->connections["\\DATA"] = memory->connections.at("\\RD_DATA").extract(i*mem->width, mem->width);
module->add(cell);
}
for (int i = 0; i < num_wr_ports; i++)
{
RTLIL::Cell *cell = new RTLIL::Cell;
cell->name = NEW_ID;
cell->type = "$memwr";
cell->parameters["\\MEMID"] = mem_name;
cell->parameters["\\ABITS"] = memory->parameters.at("\\ABITS");
cell->parameters["\\WIDTH"] = memory->parameters.at("\\WIDTH");
cell->parameters["\\CLK_ENABLE"] = RTLIL::SigSpec(memory->parameters.at("\\WR_CLK_ENABLE")).extract(i, 1).as_const();
cell->parameters["\\CLK_POLARITY"] = RTLIL::SigSpec(memory->parameters.at("\\WR_CLK_POLARITY")).extract(i, 1).as_const();
cell->parameters["\\PRIORITY"] = i;
cell->connections["\\CLK"] = memory->connections.at("\\WR_CLK").extract(i, 1);
cell->connections["\\EN"] = memory->connections.at("\\WR_EN").extract(i, 1);
cell->connections["\\ADDR"] = memory->connections.at("\\WR_ADDR").extract(i*abits, abits);
cell->connections["\\DATA"] = memory->connections.at("\\WR_DATA").extract(i*mem->width, mem->width);
module->add(cell);
}
module->cells.erase(memory->name);
delete memory;
}
static void handle_module(RTLIL::Design *design, RTLIL::Module *module)
{
std::vector<RTLIL::IdString> memcells;
for (auto &cell_it : module->cells)
if (cell_it.second->type == "$mem" && design->selected(module, cell_it.second))
memcells.push_back(cell_it.first);
for (auto &it : memcells)
handle_memory(module, module->cells.at(it));
}
struct MemoryUnpackPass : public Pass {
MemoryUnpackPass() : Pass("memory_unpack", "unpack multi-port memory cells") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" memory_unpack [selection]\n");
log("\n");
log("This pass converts the multi-port $mem memory cells into individual $memrd and\n");
log("$memwr cells. It is the counterpart to the memory_collect pass.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) {
log_header("Executing MEMORY_UNPACK pass (generating $memrd/$memwr cells form $mem cells).\n");
extra_args(args, 1, design);
for (auto &mod_it : design->modules)
if (design->selected(mod_it.second))
handle_module(design, mod_it.second);
}
} MemoryUnpackPass;

6
passes/opt/opt_rmdff.cc
View File

@ -92,6 +92,12 @@ static bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
} }
} }
if (sig_d.is_fully_undef() && sig_d.width == int(val_rv.bits.size())) {
RTLIL::SigSig conn(sig_q, val_rv);
mod->connections.push_back(conn);
goto delete_dff;
}
if (sig_d.is_fully_const() && sig_r.width == 0) { if (sig_d.is_fully_const() && sig_r.width == 0) {
RTLIL::SigSig conn(sig_q, sig_d); RTLIL::SigSig conn(sig_q, sig_d);
mod->connections.push_back(conn); mod->connections.push_back(conn);

6
techlibs/common/Makefile.inc
View File

@ -5,7 +5,7 @@ techlibs/common/blackbox.v: techlibs/common/blackbox.sed techlibs/common/simlib.
cat techlibs/common/simlib.v techlibs/common/simcells.v | sed -rf techlibs/common/blackbox.sed > techlibs/common/blackbox.v.new cat techlibs/common/simlib.v techlibs/common/simcells.v | sed -rf techlibs/common/blackbox.sed > techlibs/common/blackbox.v.new
mv techlibs/common/blackbox.v.new techlibs/common/blackbox.v mv techlibs/common/blackbox.v.new techlibs/common/blackbox.v
EXTRA_TARGETS += share/simlib.v share/simcells.v share/blackbox.v EXTRA_TARGETS += share/simlib.v share/simcells.v share/blackbox.v share/pmux2mux.v
share/simlib.v: techlibs/common/simlib.v share/simlib.v: techlibs/common/simlib.v
mkdir -p share mkdir -p share
@ -19,3 +19,7 @@ share/blackbox.v: techlibs/common/blackbox.v
mkdir -p share mkdir -p share
cp techlibs/common/blackbox.v share/blackbox.v cp techlibs/common/blackbox.v share/blackbox.v
share/pmux2mux.v: techlibs/common/pmux2mux.v
mkdir -p share
cp techlibs/common/pmux2mux.v share/pmux2mux.v

21
techlibs/common/pmux2mux.v Normal file
View File

@ -0,0 +1,21 @@
module \$pmux (A, B, S, Y);
wire [1023:0] _TECHMAP_DO_ = "proc; clean";
parameter WIDTH = 1;
parameter S_WIDTH = 1;
input [WIDTH-1:0] A;
input [WIDTH*S_WIDTH-1:0] B;
input [S_WIDTH-1:0] S;
output reg [WIDTH-1:0] Y;
integer i;
always @* begin
Y <= A;
for (i = 0; i < S_WIDTH; i=i+1)
if (S[i]) Y <= B[WIDTH*i +: WIDTH];
end
endmodule

22
techlibs/common/simlib.v
View File

@ -53,6 +53,28 @@ assign Y = ~A_BUF.val;
endmodule endmodule
// --------------------------------------------------------
module \$bu0 (A, Y);
parameter A_SIGNED = 0;
parameter A_WIDTH = 0;
parameter Y_WIDTH = 0;
`INPUT_A
output [Y_WIDTH-1:0] Y;
generate
if (!A_SIGNED && 0 < A_WIDTH && A_WIDTH < Y_WIDTH) begin:A
assign Y[A_WIDTH-1:0] = A_BUF.val;
assign Y[Y_WIDTH-1:A_WIDTH] = 0;
end else begin:B
assign Y = +A_BUF.val;
end
endgenerate
endmodule
// -------------------------------------------------------- // --------------------------------------------------------
module \$pos (A, Y); module \$pos (A, Y);

6
techlibs/common/stdcells.v
View File

@ -456,7 +456,7 @@ wire [WIDTH-1:0] A_buf, B_buf, Y_buf;
.Cin(1'b1), .Cin(1'b1),
.Y(Y_buf), .Y(Y_buf),
.Cout(carry), .Cout(carry),
.Csign(carry_sign), .Csign(carry_sign)
); );
// ALU flags // ALU flags
@ -505,7 +505,7 @@ wire [WIDTH-1:0] A_buf, B_buf, Y_buf;
.Cin(1'b1), .Cin(1'b1),
.Y(Y_buf), .Y(Y_buf),
.Cout(carry), .Cout(carry),
.Csign(carry_sign), .Csign(carry_sign)
); );
// ALU flags // ALU flags
@ -849,7 +849,7 @@ assign B_buf_u = B_SIGNED && B_buf[WIDTH-1] ? -B_buf : B_buf;
.A(A_buf_u), .A(A_buf_u),
.B(B_buf_u), .B(B_buf_u),
.Y(Y_u), .Y(Y_u),
.R(R_u), .R(R_u)
); );
assign Y = A_SIGNED && B_SIGNED && (A_buf[WIDTH-1] != B_buf[WIDTH-1]) ? -Y_u : Y_u; assign Y = A_SIGNED && B_SIGNED && (A_buf[WIDTH-1] != B_buf[WIDTH-1]) ? -Y_u : Y_u;