riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge branch 'eddie/xilinx_srl' into xaig_arrival

This commit is contained in:
Eddie Hung 2019-08-28 15:31:48 -07:00
parent 8d820a9884 52c4655de3
commit 1b08f861b6
13 changed files with 819 additions and 225 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
CHANGELOG
View File

@ -36,6 +36,8 @@ Yosys 0.9 .. Yosys 0.9-dev
- Added "ice40_wrapcarry" to encapsulate SB_LUT+SB_CARRY pairs for techmapping - Added "ice40_wrapcarry" to encapsulate SB_LUT+SB_CARRY pairs for techmapping
- Removed "ice40_unlut" - Removed "ice40_unlut"
- Improvements in pmgen: slices, choices, define, generate - Improvements in pmgen: slices, choices, define, generate
- Added "xilinx_srl" for Xilinx shift register extraction
- Removed "shregmap -tech xilinx" (superseded by "xilinx_srl")
Yosys 0.8 .. Yosys 0.9 Yosys 0.8 .. Yosys 0.9
---------------------- ----------------------

6
passes/pmgen/Makefile.inc
View File

@ -30,3 +30,9 @@ PEEPOPT_PATTERN += passes/pmgen/peepopt_muldiv.pmg
passes/pmgen/peepopt_pm.h: passes/pmgen/pmgen.py $(PEEPOPT_PATTERN) passes/pmgen/peepopt_pm.h: passes/pmgen/pmgen.py $(PEEPOPT_PATTERN)
$(P) mkdir -p passes/pmgen && python3 $< -o $@ -p peepopt $(filter-out $<,$^) $(P) mkdir -p passes/pmgen && python3 $< -o $@ -p peepopt $(filter-out $<,$^)
# --------------------------------------
OBJS += passes/pmgen/xilinx_srl.o
passes/pmgen/xilinx_srl.o: passes/pmgen/xilinx_srl_pm.h
$(eval $(call add_extra_objs,passes/pmgen/xilinx_srl_pm.h))

12
passes/pmgen/test_pmgen.cc
View File

@ -28,6 +28,7 @@ bool did_something;
#include "passes/pmgen/test_pmgen_pm.h" #include "passes/pmgen/test_pmgen_pm.h"
#include "passes/pmgen/ice40_dsp_pm.h" #include "passes/pmgen/ice40_dsp_pm.h"
#include "passes/pmgen/xilinx_srl_pm.h"
#include "passes/pmgen/peepopt_pm.h" #include "passes/pmgen/peepopt_pm.h"
void reduce_chain(test_pmgen_pm &pm) void reduce_chain(test_pmgen_pm &pm)
@ -180,7 +181,7 @@ void generate_pattern(std::function<void(pm&,std::function<void()>)> run, const
while (modcnt < maxmodcnt && submodcnt < maxsubcnt && itercnt++ < 1000) while (modcnt < maxmodcnt && submodcnt < maxsubcnt && itercnt++ < 1000)
{ {
if (timeout++ > 10000) if (timeout++ > 10000)
log_error("pmgen generator is stuck: 10000 iterations an no matching module generated.\n"); log_error("pmgen generator is stuck: 10000 iterations with no matching module generated.\n");
pm matcher(mod, mod->cells()); pm matcher(mod, mod->cells());
@ -216,7 +217,7 @@ void generate_pattern(std::function<void(pm&,std::function<void()>)> run, const
run(matcher, [](){}); run(matcher, [](){});
} }
if (submodcnt) if (submodcnt && maxsubcnt < (1 << 16))
maxsubcnt *= 2; maxsubcnt *= 2;
design->remove(mod); design->remove(mod);
@ -349,13 +350,18 @@ struct TestPmgenPass : public Pass {
if (pattern == "ice40_dsp") if (pattern == "ice40_dsp")
return GENERATE_PATTERN(ice40_dsp_pm, ice40_dsp); return GENERATE_PATTERN(ice40_dsp_pm, ice40_dsp);
if (pattern == "xilinx_srl.fixed")
return GENERATE_PATTERN(xilinx_srl_pm, fixed);
if (pattern == "xilinx_srl.variable")
return GENERATE_PATTERN(xilinx_srl_pm, variable);
if (pattern == "peepopt-muldiv") if (pattern == "peepopt-muldiv")
return GENERATE_PATTERN(peepopt_pm, muldiv); return GENERATE_PATTERN(peepopt_pm, muldiv);
if (pattern == "peepopt-shiftmul") if (pattern == "peepopt-shiftmul")
return GENERATE_PATTERN(peepopt_pm, shiftmul); return GENERATE_PATTERN(peepopt_pm, shiftmul);
log_cmd_error("Unkown pattern: %s\n", pattern.c_str()); log_cmd_error("Unknown pattern: %s\n", pattern.c_str());
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE

262
passes/pmgen/xilinx_srl.cc Normal file
View File

@ -0,0 +1,262 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
* (C) 2019 Eddie Hung <eddie@fpgeh.com>
*
* 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
// for peepopt_pm
bool did_something;
#include "passes/pmgen/xilinx_srl_pm.h"
#include "passes/pmgen/peepopt_pm.h"
void run_fixed(xilinx_srl_pm &pm)
{
auto &st = pm.st_fixed;
auto &ud = pm.ud_fixed;
log("Found fixed chain of length %d (%s):\n", GetSize(ud.longest_chain), log_id(st.first->type));
SigSpec initval;
for (auto cell : ud.longest_chain) {
log_debug(" %s\n", log_id(cell));
if (cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_))) {
SigBit Q = cell->getPort(ID(Q));
log_assert(Q.wire);
auto it = Q.wire->attributes.find(ID(init));
if (it != Q.wire->attributes.end()) {
auto &i = it->second[Q.offset];
initval.append(i);
i = State::Sx;
}
else
initval.append(State::Sx);
}
else if (cell->type.in(ID(FDRE), ID(FDRE_1))) {
if (cell->parameters.at(ID(INIT), State::S0).as_bool())
initval.append(State::S1);
else
initval.append(State::S0);
}
else
log_abort();
pm.autoremove(cell);
}
auto first_cell = ud.longest_chain.back();
auto last_cell = ud.longest_chain.front();
Cell *c = pm.module->addCell(NEW_ID, ID($__XILINX_SHREG_));
pm.module->swap_names(c, first_cell);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_), ID(FDRE), ID(FDRE_1))) {
c->setParam(ID(DEPTH), GetSize(ud.longest_chain));
c->setParam(ID(INIT), initval.as_const());
if (first_cell->type.in(ID($_DFF_P_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setParam(ID(CLKPOL), 1);
else if (first_cell->type.in(ID($_DFF_N_), ID($DFFE_NN_), ID($_DFFE_NP_), ID(FDRE_1)))
c->setParam(ID(CLKPOL), 0);
else if (first_cell->type.in(ID(FDRE))) {
if (!first_cell->parameters.at(ID(IS_C_INVERTED), State::S0).as_bool())
c->setParam(ID(CLKPOL), 1);
else
c->setParam(ID(CLKPOL), 0);
}
else
log_abort();
if (first_cell->type.in(ID($_DFFE_NP_), ID($_DFFE_PP_)))
c->setParam(ID(ENPOL), 1);
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_PN_)))
c->setParam(ID(ENPOL), 0);
else
c->setParam(ID(ENPOL), 2);
c->setPort(ID(C), first_cell->getPort(ID(C)));
c->setPort(ID(D), first_cell->getPort(ID(D)));
c->setPort(ID(Q), last_cell->getPort(ID(Q)));
c->setPort(ID(L), GetSize(ud.longest_chain)-1);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_)))
c->setPort(ID(E), State::S1);
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setPort(ID(E), first_cell->getPort(ID(E)));
else if (first_cell->type.in(ID(FDRE), ID(FDRE_1)))
c->setPort(ID(E), first_cell->getPort(ID(CE)));
else
log_abort();
}
else
log_abort();
log(" -> %s (%s)\n", log_id(c), log_id(c->type));
}
void run_variable(xilinx_srl_pm &pm)
{
auto &st = pm.st_variable;
auto &ud = pm.ud_variable;
log("Found variable chain of length %d (%s):\n", GetSize(ud.chain), log_id(st.first->type));
SigSpec initval;
for (const auto &i : ud.chain) {
auto cell = i.first;
auto slice = i.second;
log_debug(" %s\n", log_id(cell));
if (cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_), ID($dff), ID($dffe))) {
SigBit Q = cell->getPort(ID(Q))[slice];
log_assert(Q.wire);
auto it = Q.wire->attributes.find(ID(init));
if (it != Q.wire->attributes.end()) {
auto &i = it->second[Q.offset];
initval.append(i);
i = State::Sx;
}
else
initval.append(State::Sx);
}
else
log_abort();
}
pm.autoremove(st.shiftx);
auto first_cell = ud.chain.back().first;
auto first_slice = ud.chain.back().second;
Cell *c = pm.module->addCell(NEW_ID, ID($__XILINX_SHREG_));
pm.module->swap_names(c, first_cell);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_), ID($dff), ID($dffe))) {
c->setParam(ID(DEPTH), GetSize(ud.chain));
c->setParam(ID(INIT), initval.as_const());
Const clkpol, enpol;
if (first_cell->type.in(ID($_DFF_P_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
clkpol = 1;
else if (first_cell->type.in(ID($_DFF_N_), ID($DFFE_NN_), ID($_DFFE_NP_)))
clkpol = 0;
else if (first_cell->type.in(ID($dff), ID($dffe)))
clkpol = first_cell->getParam(ID(CLK_POLARITY));
else
log_abort();
if (first_cell->type.in(ID($_DFFE_NP_), ID($_DFFE_PP_)))
enpol = 1;
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_PN_)))
enpol = 0;
else if (first_cell->type.in(ID($dffe)))
enpol = first_cell->getParam(ID(EN_POLARITY));
else
enpol = 2;
c->setParam(ID(CLKPOL), clkpol);
c->setParam(ID(ENPOL), enpol);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setPort(ID(C), first_cell->getPort(ID(C)));
else if (first_cell->type.in(ID($dff), ID($dffe)))
c->setPort(ID(C), first_cell->getPort(ID(CLK)));
else
log_abort();
c->setPort(ID(D), first_cell->getPort(ID(D))[first_slice]);
c->setPort(ID(Q), st.shiftx->getPort(ID(Y)));
c->setPort(ID(L), st.shiftx->getPort(ID(B)));
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($dff)))
c->setPort(ID(E), State::S1);
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setPort(ID(E), first_cell->getPort(ID(E)));
else if (first_cell->type.in(ID($dffe)))
c->setPort(ID(E), first_cell->getPort(ID(EN)));
else
log_abort();
}
else
log_abort();
log(" -> %s (%s)\n", log_id(c), log_id(c->type));
}
struct XilinxSrlPass : public Pass {
XilinxSrlPass() : Pass("xilinx_srl", "Xilinx shift register extraction") { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" xilinx_srl [options] [selection]\n");
log("\n");
log("This pass converts chains of built-in flops (bit-level: $_DFF_[NP]_, $_DFFE_*\n");
log("and word-level: $dff, $dffe) as well as Xilinx flops (FDRE, FDRE_1) into a\n");
log("$__XILINX_SHREG cell. Chains must be of the same cell type, clock, clock polarity,\n");
log("enable, and enable polarity (where relevant).\n");
log("Flops with resets cannot be mapped to Xilinx devices and will not be inferred.");
log("\n");
log(" -minlen N\n");
log(" min length of shift register (default = 3)\n");
log("\n");
log(" -fixed\n");
log(" infer fixed-length shift registers.\n");
log("\n");
log(" -variable\n");
log(" infer variable-length shift registers (i.e. fixed-length shifts where\n");
log(" each element also fans-out to a $shiftx cell).\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
log_header(design, "Executing XILINX_SRL pass (Xilinx shift register extraction).\n");
bool fixed = false;
bool variable = false;
int minlen = 3;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-minlen" && argidx+1 < args.size()) {
minlen = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-fixed") {
fixed = true;
continue;
}
if (args[argidx] == "-variable") {
variable = true;
continue;
}
break;
}
extra_args(args, argidx, design);
if (!fixed && !variable)
log_cmd_error("'-fixed' and/or '-variable' must be specified.\n");
for (auto module : design->selected_modules()) {
auto pm = xilinx_srl_pm(module, module->selected_cells());
pm.ud_fixed.minlen = minlen;
pm.ud_variable.minlen = minlen;
if (fixed)
pm.run_fixed(run_fixed);
if (variable)
pm.run_variable(run_variable);
}
}
} XilinxSrlPass;
PRIVATE_NAMESPACE_END

326
passes/pmgen/xilinx_srl.pmg Normal file
View File

@ -0,0 +1,326 @@
pattern fixed
state <IdString> clk_port en_port
udata <vector<Cell*>> chain longest_chain
udata <pool<Cell*>> non_first_cells
udata <int> minlen
code
non_first_cells.clear();
subpattern(setup);
endcode
match first
select first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
select !first->has_keep_attr()
select !first->type.in(\FDRE) || !first->parameters.at(\IS_R_INVERTED, State::S0).as_bool()
select !first->type.in(\FDRE) || !first->parameters.at(\IS_D_INVERTED, State::S0).as_bool()
select !first->type.in(\FDRE, \FDRE_1) || first->connections_.at(\R, State::S0).is_fully_zero()
filter !non_first_cells.count(first)
generate
SigSpec C = module->addWire(NEW_ID);
SigSpec D = module->addWire(NEW_ID);
SigSpec Q = module->addWire(NEW_ID);
auto r = rng(8);
Cell* cell;
switch (r)
{
case 0:
case 1:
cell = module->addCell(NEW_ID, \FDRE);
cell->setPort(\C, C);
cell->setPort(\D, D);
cell->setPort(\Q, Q);
cell->setPort(\CE, module->addWire(NEW_ID));
if (r & 1)
cell->setPort(\R, module->addWire(NEW_ID));
else {
if (rng(2) == 0)
cell->setPort(\R, State::S0);
}
break;
case 2:
case 3:
cell = module->addDffGate(NEW_ID, C, D, Q, r & 1);
break;
case 4:
case 5:
case 6:
case 7:
cell = module->addDffeGate(NEW_ID, C, module->addWire(NEW_ID), D, Q, r & 1, r & 2);
break;
default: log_abort();
}
endmatch
code clk_port en_port
if (first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1))
clk_port = \C;
else log_abort();
if (first->type.in($_DFF_N_, $_DFF_P_))
en_port = IdString();
else if (first->type.in($_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_))
en_port = \E;
else if (first->type.in(\FDRE, \FDRE_1))
en_port = \CE;
else log_abort();
longest_chain.clear();
chain.push_back(first);
subpattern(tail);
finally
chain.pop_back();
log_assert(chain.empty());
if (GetSize(longest_chain) >= minlen)
accept;
endcode
// ------------------------------------------------------------------
subpattern setup
arg clk_port
arg en_port
match first
select first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
select !first->has_keep_attr()
select !first->type.in(\FDRE) || !first->parameters.at(\IS_R_INVERTED, State::S0).as_bool()
select !first->type.in(\FDRE) || !first->parameters.at(\IS_D_INVERTED, State::S0).as_bool()
select !first->type.in(\FDRE, \FDRE_1) || first->connections_.at(\R, State::S0).is_fully_zero()
endmatch
code clk_port en_port
if (first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1))
clk_port = \C;
else log_abort();
if (first->type.in($_DFF_N_, $_DFF_P_))
en_port = IdString();
else if (first->type.in($_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_))
en_port = \E;
else if (first->type.in(\FDRE, \FDRE_1))
en_port = \CE;
else log_abort();
endcode
match next
select next->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
select !next->has_keep_attr()
select !port(next, \D)[0].wire->get_bool_attribute(\keep)
select nusers(port(next, \Q)) == 2
index <IdString> next->type === first->type
index <SigBit> port(next, \Q) === port(first, \D)
filter port(next, clk_port) == port(first, clk_port)
filter en_port == IdString() || port(next, en_port) == port(first, en_port)
filter !first->type.in(\FDRE) || next->parameters.at(\IS_C_INVERTED, State::S0).as_bool() == first->parameters.at(\IS_C_INVERTED, State::S0).as_bool()
filter !first->type.in(\FDRE) || next->parameters.at(\IS_D_INVERTED, State::S0).as_bool() == first->parameters.at(\IS_D_INVERTED, State::S0).as_bool()
filter !first->type.in(\FDRE) || next->parameters.at(\IS_R_INVERTED, State::S0).as_bool() == first->parameters.at(\IS_R_INVERTED, State::S0).as_bool()
filter !first->type.in(\FDRE, \FDRE_1) || next->connections_.at(\R, State::S0).is_fully_zero()
endmatch
code
non_first_cells.insert(next);
endcode
// ------------------------------------------------------------------
subpattern tail
arg first
arg clk_port
arg en_port
match next
semioptional
select next->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, \FDRE, \FDRE_1)
select !next->has_keep_attr()
select !port(next, \D)[0].wire->get_bool_attribute(\keep)
select nusers(port(next, \Q)) == 2
index <IdString> next->type === chain.back()->type
index <SigBit> port(next, \Q) === port(chain.back(), \D)
filter port(next, clk_port) == port(first, clk_port)
filter en_port == IdString() || port(next, en_port) == port(first, en_port)
filter !first->type.in(\FDRE) || next->parameters.at(\IS_C_INVERTED, State::S0).as_bool() == first->parameters.at(\IS_C_INVERTED, State::S0).as_bool()
filter !first->type.in(\FDRE) || next->parameters.at(\IS_D_INVERTED, State::S0).as_bool() == first->parameters.at(\IS_D_INVERTED, State::S0).as_bool()
filter !first->type.in(\FDRE) || next->parameters.at(\IS_R_INVERTED, State::S0).as_bool() == first->parameters.at(\IS_R_INVERTED, State::S0).as_bool()
filter !first->type.in(\FDRE, \FDRE_1) || next->connections_.at(\R, State::S0).is_fully_zero()
generate
Cell *cell = module->addCell(NEW_ID, chain.back()->type);
cell->setPort(\C, chain.back()->getPort(\C));
cell->setPort(\D, module->addWire(NEW_ID));
cell->setPort(\Q, chain.back()->getPort(\D));
if (cell->type == \FDRE) {
if (rng(2) == 0)
cell->setPort(\R, chain.back()->connections_.at(\R, State::S0));
cell->setPort(\CE, chain.back()->getPort(\CE));
}
else if (cell->type.begins_with("$_DFFE_"))
cell->setPort(\E, chain.back()->getPort(\E));
endmatch
code
if (next) {
chain.push_back(next);
subpattern(tail);
} else {
if (GetSize(chain) > GetSize(longest_chain))
longest_chain = chain;
}
finally
if (next)
chain.pop_back();
endcode
// -----------
pattern variable
state <IdString> clk_port en_port
state <int> shiftx_width
state <int> slice
udata <int> minlen
udata <vector<pair<Cell*,int>>> chain
udata <pool<SigBit>> chain_bits
code
chain_bits.clear();
endcode
match shiftx
select shiftx->type.in($shiftx)
select !shiftx->has_keep_attr()
select param(shiftx, \Y_WIDTH).as_int() == 1
filter param(shiftx, \A_WIDTH).as_int() >= minlen
generate
minlen = 3;
module->addShiftx(NEW_ID, module->addWire(NEW_ID, rng(6)+minlen), module->addWire(NEW_ID, 3), module->addWire(NEW_ID));
endmatch
code shiftx_width
shiftx_width = param(shiftx, \A_WIDTH).as_int();
endcode
match first
select first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, $dff, $dffe)
select !first->has_keep_attr()
select !port(first, \Q)[0].wire->get_bool_attribute(\keep)
slice idx GetSize(port(first, \Q))
select nusers(port(first, \Q)[idx]) <= 2
index <SigBit> port(first, \Q)[idx] === port(shiftx, \A)[shiftx_width-1]
set slice idx
generate
SigSpec C = module->addWire(NEW_ID);
auto WIDTH = rng(3)+1;
SigSpec D = module->addWire(NEW_ID, WIDTH);
SigSpec Q = module->addWire(NEW_ID, WIDTH);
auto r = rng(8);
Cell *cell = nullptr;
switch (r)
{
case 0:
case 1:
cell = module->addDff(NEW_ID, C, D, Q, r & 1);
break;
case 2:
case 3:
case 4:
case 5:
//cell = module->addDffe(NEW_ID, C, module->addWire(NEW_ID), D, Q, r & 1, r & 4);
//break;
case 6:
case 7:
WIDTH = 1;
cell = module->addDffGate(NEW_ID, C, D[0], Q[0], r & 1);
break;
default: log_abort();
}
shiftx->connections_.at(\A)[shiftx_width-1] = port(cell, \Q)[rng(WIDTH)];
endmatch
code clk_port en_port
if (first->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_))
clk_port = \C;
else if (first->type.in($dff, $dffe))
clk_port = \CLK;
else log_abort();
if (first->type.in($_DFF_N_, $_DFF_P_, $dff))
en_port = IdString();
else if (first->type.in($_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_))
en_port = \E;
else if (first->type.in($dffe))
en_port = \EN;
else log_abort();
chain_bits.insert(port(first, \Q)[slice]);
chain.emplace_back(first, slice);
subpattern(tail);
finally
if (GetSize(chain) == shiftx_width)
accept;
chain.clear();
endcode
// ------------------------------------------------------------------
subpattern tail
arg first
arg shiftx
arg shiftx_width
arg slice
arg clk_port
arg en_port
match next
semioptional
select next->type.in($_DFF_N_, $_DFF_P_, $_DFFE_NN_, $_DFFE_NP_, $_DFFE_PN_, $_DFFE_PP_, $dff, $dffe)
select !next->has_keep_attr()
select !port(next, \D)[0].wire->get_bool_attribute(\keep)
slice idx GetSize(port(next, \Q))
select nusers(port(next, \Q)[idx]) <= 3
index <IdString> next->type === chain.back().first->type
index <SigBit> port(next, \Q)[idx] === port(chain.back().first, \D)[chain.back().second]
index <SigBit> port(next, \Q)[idx] === port(shiftx, \A)[shiftx_width-1-GetSize(chain)]
filter port(next, clk_port) == port(first, clk_port)
filter en_port == IdString() || port(next, en_port) == port(first, en_port)
filter !next->type.in($dff, $dffe) || param(next, \CLK_POLARITY).as_bool() == param(first, \CLK_POLARITY).as_bool()
filter !next->type.in($dffe) || param(next, \EN_POLARITY).as_bool() == param(first, \EN_POLARITY).as_bool()
filter !chain_bits.count(port(next, \D)[idx])
set slice idx
generate
if (GetSize(chain) < shiftx_width) {
auto back = chain.back().first;
auto slice = chain.back().second;
if (back->type.in($dff, $dffe)) {
auto WIDTH = GetSize(port(back, \D));
if (rng(2) == 0 && slice < WIDTH-1) {
auto new_slice = slice + rng(WIDTH-1-slice);
back->connections_.at(\D)[slice] = port(back, \Q)[new_slice];
}
else {
auto D = module->addWire(NEW_ID, WIDTH);
if (back->type == $dff)
module->addDff(NEW_ID, port(back, \CLK), D, port(back, \D), param(back, \CLK_POLARITY).as_bool());
else if (back->type == $dffe)
module->addDffe(NEW_ID, port(back, \CLK), port(back, \EN), D, port(back, \D), param(back, \CLK_POLARITY).as_bool(), param(back, \EN_POLARITY).as_bool());
else
log_abort();
}
}
else if (back->type.begins_with("$_DFF_")) {
Cell *cell = module->addCell(NEW_ID, back->type);
cell->setPort(\C, back->getPort(\C));
cell->setPort(\D, module->addWire(NEW_ID));
cell->setPort(\Q, back->getPort(\D));
}
else
log_abort();
shiftx->connections_.at(\A)[shiftx_width-1-GetSize(chain)] = port(back, \D)[slice];
}
endmatch
code
if (next) {
chain_bits.insert(port(next, \Q)[slice]);
chain.emplace_back(next, slice);
if (GetSize(chain) < shiftx_width)
subpattern(tail);
}
endcode

179
passes/techmap/shregmap.cc
View File

@ -26,9 +26,7 @@ PRIVATE_NAMESPACE_BEGIN
struct ShregmapTech struct ShregmapTech
{ {
virtual ~ShregmapTech() { } virtual ~ShregmapTech() { }
virtual void init(const Module * /*module*/, const SigMap &/*sigmap*/) {} virtual bool analyze(vector<int> &taps) = 0;
virtual void non_chain_user(const SigBit &/*bit*/, const Cell* /*cell*/, IdString /*port*/) {}
virtual bool analyze(vector<int> &taps, const vector<SigBit> &qbits) = 0;
virtual bool fixup(Cell *cell, dict<int, SigBit> &taps) = 0; virtual bool fixup(Cell *cell, dict<int, SigBit> &taps) = 0;
}; };
@ -56,7 +54,7 @@ struct ShregmapOptions
struct ShregmapTechGreenpak4 : ShregmapTech struct ShregmapTechGreenpak4 : ShregmapTech
{ {
bool analyze(vector<int> &taps, const vector<SigBit> &/*qbits*/) bool analyze(vector<int> &taps)
{ {
if (GetSize(taps) > 2 && taps[0] == 0 && taps[2] < 17) { if (GetSize(taps) > 2 && taps[0] == 0 && taps[2] < 17) {
taps.clear(); taps.clear();
@ -93,155 +91,6 @@ struct ShregmapTechGreenpak4 : ShregmapTech
} }
}; };
struct ShregmapTechXilinx7 : ShregmapTech
{
dict<SigBit, std::tuple<Cell*,int,int>> sigbit_to_shiftx_offset;
const ShregmapOptions &opts;
ShregmapTechXilinx7(const ShregmapOptions &opts) : opts(opts) {}
virtual void init(const Module* module, const SigMap &sigmap) override
{
for (const auto &i : module->cells_) {
auto cell = i.second;
if (cell->type == ID($shiftx)) {
if (cell->getParam(ID(Y_WIDTH)) != 1) continue;
int j = 0;
for (auto bit : sigmap(cell->getPort(ID::A)))
sigbit_to_shiftx_offset[bit] = std::make_tuple(cell, j++, 0);
log_assert(j == cell->getParam(ID(A_WIDTH)).as_int());
}
else if (cell->type == ID($mux)) {
int j = 0;
for (auto bit : sigmap(cell->getPort(ID::A)))
sigbit_to_shiftx_offset[bit] = std::make_tuple(cell, 0, j++);
j = 0;
for (auto bit : sigmap(cell->getPort(ID::B)))
sigbit_to_shiftx_offset[bit] = std::make_tuple(cell, 1, j++);
}
}
}
virtual void non_chain_user(const SigBit &bit, const Cell *cell, IdString port) override
{
auto it = sigbit_to_shiftx_offset.find(bit);
if (it == sigbit_to_shiftx_offset.end())
return;
if (cell) {
if (cell->type == ID($shiftx) && port == ID::A)
return;
if (cell->type == ID($mux) && port.in(ID::A, ID::B))
return;
}
sigbit_to_shiftx_offset.erase(it);
}
virtual bool analyze(vector<int> &taps, const vector<SigBit> &qbits) override
{
if (GetSize(taps) == 1)
return taps[0] >= opts.minlen-1 && sigbit_to_shiftx_offset.count(qbits[0]);
if (taps.back() < opts.minlen-1)
return false;
Cell *shiftx = nullptr;
int group = 0;
for (int i = 0; i < GetSize(taps); ++i) {
auto it = sigbit_to_shiftx_offset.find(qbits[i]);
if (it == sigbit_to_shiftx_offset.end())
return false;
// Check taps are sequential
if (i != taps[i])
return false;
// Check taps are not connected to a shift register,
// or sequential to the same shift register
if (i == 0) {
int offset;
std::tie(shiftx,offset,group) = it->second;
if (offset != i)
return false;
}
else {
Cell *shiftx_ = std::get<0>(it->second);
if (shiftx_ != shiftx)
return false;
int offset = std::get<1>(it->second);
if (offset != i)
return false;
int group_ = std::get<2>(it->second);
if (group_ != group)
return false;
}
}
log_assert(shiftx);
// Only map if $shiftx exclusively covers the shift register
if (shiftx->type == ID($shiftx)) {
if (GetSize(taps) > shiftx->getParam(ID(A_WIDTH)).as_int())
return false;
// Due to padding the most significant bits of A may be 1'bx,
// and if so, discount them
if (GetSize(taps) < shiftx->getParam(ID(A_WIDTH)).as_int()) {
const SigSpec A = shiftx->getPort(ID::A);
const int A_width = shiftx->getParam(ID(A_WIDTH)).as_int();
for (int i = GetSize(taps); i < A_width; ++i)
if (A[i] != RTLIL::Sx) return false;
}
else if (GetSize(taps) != shiftx->getParam(ID(A_WIDTH)).as_int())
return false;
}
else if (shiftx->type == ID($mux)) {
if (GetSize(taps) != 2)
return false;
}
else log_abort();
return true;
}
virtual bool fixup(Cell *cell, dict<int, SigBit> &taps) override
{
const auto &tap = *taps.begin();
auto bit = tap.second;
auto it = sigbit_to_shiftx_offset.find(bit);
log_assert(it != sigbit_to_shiftx_offset.end());
auto newcell = cell->module->addCell(NEW_ID, ID($__XILINX_SHREG_));
newcell->set_src_attribute(cell->get_src_attribute());
newcell->setParam(ID(DEPTH), cell->getParam(ID(DEPTH)));
newcell->setParam(ID(INIT), cell->getParam(ID(INIT)));
newcell->setParam(ID(CLKPOL), cell->getParam(ID(CLKPOL)));
newcell->setParam(ID(ENPOL), cell->getParam(ID(ENPOL)));
newcell->setPort(ID(C), cell->getPort(ID(C)));
newcell->setPort(ID(D), cell->getPort(ID(D)));
if (cell->hasPort(ID(E)))
newcell->setPort(ID(E), cell->getPort(ID(E)));
Cell* shiftx = std::get<0>(it->second);
RTLIL::SigSpec l_wire, q_wire;
if (shiftx->type == ID($shiftx)) {
l_wire = shiftx->getPort(ID::B);
q_wire = shiftx->getPort(ID::Y);
shiftx->setPort(ID::Y, cell->module->addWire(NEW_ID));
}
else if (shiftx->type == ID($mux)) {
l_wire = shiftx->getPort(ID(S));
q_wire = shiftx->getPort(ID::Y);
shiftx->setPort(ID::Y, cell->module->addWire(NEW_ID));
}
else log_abort();
newcell->setPort(ID(Q), q_wire);
newcell->setPort(ID(L), l_wire);
return false;
}
};
struct ShregmapWorker struct ShregmapWorker
{ {
Module *module; Module *module;
@ -264,10 +113,8 @@ struct ShregmapWorker
for (auto wire : module->wires()) for (auto wire : module->wires())
{ {
if (wire->port_output || wire->get_bool_attribute(ID::keep)) { if (wire->port_output || wire->get_bool_attribute(ID::keep)) {
for (auto bit : sigmap(wire)) { for (auto bit : sigmap(wire))
sigbit_with_non_chain_users.insert(bit); sigbit_with_non_chain_users.insert(bit);
if (opts.tech) opts.tech->non_chain_user(bit, nullptr, {});
}
} }
if (wire->attributes.count(ID(init))) { if (wire->attributes.count(ID(init))) {
@ -317,10 +164,8 @@ struct ShregmapWorker
for (auto conn : cell->connections()) for (auto conn : cell->connections())
if (cell->input(conn.first)) if (cell->input(conn.first))
for (auto bit : sigmap(conn.second)) { for (auto bit : sigmap(conn.second))
sigbit_with_non_chain_users.insert(bit); sigbit_with_non_chain_users.insert(bit);
if (opts.tech) opts.tech->non_chain_user(bit, cell, conn.first);
}
} }
} }
@ -425,7 +270,7 @@ struct ShregmapWorker
if (taps.empty() || taps.back() < depth-1) if (taps.empty() || taps.back() < depth-1)
taps.push_back(depth-1); taps.push_back(depth-1);
if (opts.tech->analyze(taps, qbits)) if (opts.tech->analyze(taps))
break; break;
taps.pop_back(); taps.pop_back();
@ -544,9 +389,6 @@ struct ShregmapWorker
ShregmapWorker(Module *module, const ShregmapOptions &opts) : ShregmapWorker(Module *module, const ShregmapOptions &opts) :
module(module), sigmap(module), opts(opts), dff_count(0), shreg_count(0) module(module), sigmap(module), opts(opts), dff_count(0), shreg_count(0)
{ {
if (opts.tech)
opts.tech->init(module, sigmap);
make_sigbit_chain_next_prev(); make_sigbit_chain_next_prev();
find_chain_start_cells(); find_chain_start_cells();
@ -617,11 +459,6 @@ struct ShregmapPass : public Pass {
log("\n"); log("\n");
log(" -tech greenpak4\n"); log(" -tech greenpak4\n");
log(" map to greenpak4 shift registers.\n"); log(" map to greenpak4 shift registers.\n");
log(" this option also implies -clkpol pos -zinit\n");
log("\n");
log(" -tech xilinx\n");
log(" map to xilinx dynamic-length shift registers.\n");
log(" this option also implies -params -init\n");
log("\n"); log("\n");
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@ -676,12 +513,6 @@ struct ShregmapPass : public Pass {
clkpol = "pos"; clkpol = "pos";
opts.zinit = true; opts.zinit = true;
opts.tech = new ShregmapTechGreenpak4; opts.tech = new ShregmapTechGreenpak4;
}
else if (tech == "xilinx") {
opts.init = true;
opts.params = true;
enpol = "any_or_none";
opts.tech = new ShregmapTechXilinx7(opts);
} else { } else {
argidx--; argidx--;
break; break;

37
techlibs/xilinx/synth_xilinx.cc
View File

@ -303,9 +303,8 @@ struct SynthXilinxPass : public ScriptPass
if (widemux > 0 || help_mode) if (widemux > 0 || help_mode)
run("muxpack", " ('-widemux' only)"); run("muxpack", " ('-widemux' only)");
// shregmap -tech xilinx can cope with $shiftx and $mux // xilinx_srl looks for $shiftx cells for identifying variable-length
// cells for identifying variable-length shift registers, // shift registers, so attempt to convert $pmux-es to this
// so attempt to convert $pmux-es to the former
// Also: wide multiplexer inference benefits from this too // Also: wide multiplexer inference benefits from this too
if (!(nosrl && widemux == 0) || help_mode) { if (!(nosrl && widemux == 0) || help_mode) {
run("pmux2shiftx", "(skip if '-nosrl' and '-widemux=0')"); run("pmux2shiftx", "(skip if '-nosrl' and '-widemux=0')");
@ -387,13 +386,8 @@ struct SynthXilinxPass : public ScriptPass
} }
run("opt -full"); run("opt -full");
if (!nosrl || help_mode) { if (!nosrl || help_mode)
// shregmap operates on bit-level flops, not word-level, run("xilinx_srl -variable -minlen 3", "(skip if '-nosrl')");
// so break those down here
run("simplemap t:$dff t:$dffe", " (skip if '-nosrl')");
// shregmap with '-tech xilinx' infers variable length shift regs
run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')");
}
std::string techmap_args = " -map +/techmap.v"; std::string techmap_args = " -map +/techmap.v";
if (help_mode) if (help_mode)
@ -421,6 +415,14 @@ struct SynthXilinxPass : public ScriptPass
run("clean"); run("clean");
} }
if (check_label("map_ffs")) {
if (abc9 || help_mode) {
run("techmap -map +/xilinx/ff_map.v", "('-abc9' only)");
run("dffinit -ff FDRE Q INIT -ff FDCE Q INIT -ff FDPE Q INIT -ff FDSE Q INIT "
"-ff FDRE_1 Q INIT -ff FDCE_1 Q INIT -ff FDPE_1 Q INIT -ff FDSE_1 Q INIT", "('-abc9' only)");
}
}
if (check_label("map_luts")) { if (check_label("map_luts")) {
run("opt_expr -mux_undef"); run("opt_expr -mux_undef");
if (flatten_before_abc) if (flatten_before_abc)
@ -448,13 +450,18 @@ struct SynthXilinxPass : public ScriptPass
// This shregmap call infers fixed length shift registers after abc // This shregmap call infers fixed length shift registers after abc
// has performed any necessary retiming // has performed any necessary retiming
if (!nosrl || help_mode) if (!nosrl || help_mode)
run("shregmap -minlen 3 -init -params -enpol any_or_none", "(skip if '-nosrl')"); run("xilinx_srl -fixed -minlen 3", "(skip if '-nosrl')");
std::string techmap_args = "-map +/xilinx/lut_map.v -map +/xilinx/ff_map.v"; std::string techmap_args = "-map +/xilinx/lut_map.v -map +/xilinx/cells_map.v";
if (abc9) if (help_mode)
techmap_args += " [-map +/xilinx/ff_map.v]";
else if (abc9)
techmap_args += " -map +/xilinx/abc_unmap.v"; techmap_args += " -map +/xilinx/abc_unmap.v";
else
techmap_args += " -map +/xilinx/ff_map.v";
run("techmap " + techmap_args); run("techmap " + techmap_args);
run("dffinit -ff FDRE Q INIT -ff FDCE Q INIT -ff FDPE Q INIT -ff FDSE Q INIT " if (!abc9 || help_mode)
"-ff FDRE_1 Q INIT -ff FDCE_1 Q INIT -ff FDPE_1 Q INIT -ff FDSE_1 Q INIT"); run("dffinit -ff FDRE Q INIT -ff FDCE Q INIT -ff FDPE Q INIT -ff FDSE Q INIT "
"-ff FDRE_1 Q INIT -ff FDCE_1 Q INIT -ff FDPE_1 Q INIT -ff FDSE_1 Q INIT", "(without '-abc9' only)");
run("clean"); run("clean");
} }

33
tests/various/shregmap.ys
View File

@ -31,36 +31,3 @@ sat -verify -prove-asserts -show-ports -seq 5 miter
#design -load gate #design -load gate
#stat #stat
##########
design -load read
design -copy-to model $__XILINX_SHREG_
hierarchy -top shregmap_variable_test
prep
design -save gold
simplemap t:$dff t:$dffe
shregmap -tech xilinx
#stat
# show -width
# write_verilog -noexpr -norename
select -assert-count 1 t:$_DFF_P_
select -assert-count 2 t:$__XILINX_SHREG_
design -stash gate
design -import gold -as gold
design -import gate -as gate
design -copy-from model -as $__XILINX_SHREG_ \$__XILINX_SHREG_
prep
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts -show-ports -seq 5 miter
# design -load gold
# stat
# design -load gate
# stat

3
tests/xilinx/.gitignore vendored Normal file
View File

@ -0,0 +1,3 @@
/*.log
/*.out
/run-test.mk

57
tests/xilinx/pmgen_xilinx_srl.ys Normal file
View File

@ -0,0 +1,57 @@
read_verilog -icells <<EOT
module \$__XILINX_SHREG_ (input C, input D, input [31:0] L, input E, output Q, output SO);
parameter DEPTH = 1;
parameter [DEPTH-1:0] INIT = 0;
parameter CLKPOL = 1;
parameter ENPOL = 2;
wire pos_clk = C == CLKPOL;
reg pos_en;
always @(E)
if (ENPOL == 2) pos_en = 1'b1;
else pos_en = (E == ENPOL[0]);
reg [DEPTH-1:0] r;
always @(posedge pos_clk)
if (pos_en)
r <= {r[DEPTH-2:0], D};
assign Q = r[L];
assign SO = r[DEPTH-1];
endmodule
EOT
read_verilog +/xilinx/cells_sim.v
proc
design -save model
test_pmgen -generate xilinx_srl.fixed
hierarchy -top pmtest_xilinx_srl_pm_fixed
flatten; opt_clean
design -save gold
xilinx_srl -fixed
techmap -autoproc -map %model
design -stash gate
design -copy-from gold -as gold pmtest_xilinx_srl_pm_fixed
design -copy-from gate -as gate pmtest_xilinx_srl_pm_fixed
dff2dffe -unmap # sat does not support flops-with-enable yet
miter -equiv -flatten -make_assert gold gate miter
sat -set-init-zero -seq 5 -verify -prove-asserts miter
design -load model
test_pmgen -generate xilinx_srl.variable
hierarchy -top pmtest_xilinx_srl_pm_variable
flatten; opt_clean
design -save gold
xilinx_srl -variable
techmap -autoproc -map %model
design -stash gate
design -copy-from gold -as gold pmtest_xilinx_srl_pm_variable
design -copy-from gate -as gate pmtest_xilinx_srl_pm_variable
dff2dffe -unmap # sat does not support flops-with-enable yet
miter -equiv -flatten -make_assert gold gate miter
sat -set-init-zero -seq 5 -verify -prove-asserts miter

20
tests/xilinx/run-test.sh Executable file
View File

@ -0,0 +1,20 @@
#!/usr/bin/env bash
set -e
{
echo "all::"
for x in *.ys; do
echo "all:: run-$x"
echo "run-$x:"
echo " @echo 'Running $x..'"
echo " @../../yosys -ql ${x%.ys}.log $x"
done
for s in *.sh; do
if [ "$s" != "run-test.sh" ]; then
echo "all:: run-$s"
echo "run-$s:"
echo " @echo 'Running $s..'"
echo " @bash $s"
fi
done
} > run-test.mk
exec ${MAKE:-make} -f run-test.mk

40
tests/xilinx/xilinx_srl.v Normal file
View File

@ -0,0 +1,40 @@
module xilinx_srl_static_test(input i, clk, output [1:0] q);
reg head = 1'b0;
reg [3:0] shift1 = 4'b0000;
reg [3:0] shift2 = 4'b0000;
always @(posedge clk) begin
head <= i;
shift1 <= {shift1[2:0], head};
shift2 <= {shift2[2:0], head};
end
assign q = {shift2[3], shift1[3]};
endmodule
module xilinx_srl_variable_test(input i, clk, input [1:0] l1, l2, output [1:0] q);
reg head = 1'b0;
reg [3:0] shift1 = 4'b0000;
reg [3:0] shift2 = 4'b0000;
always @(posedge clk) begin
head <= i;
shift1 <= {shift1[2:0], head};
shift2 <= {shift2[2:0], head};
end
assign q = {shift2[l2], shift1[l1]};
endmodule
module $__XILINX_SHREG_(input C, D, E, input [1:0] L, output Q);
parameter CLKPOL = 1;
parameter ENPOL = 1;
parameter DEPTH = 1;
parameter [DEPTH-1:0] INIT = {DEPTH{1'b0}};
reg [DEPTH-1:0] r = INIT;
wire clk = C ^ CLKPOL;
always @(posedge C)
if (E)
r <= { r[DEPTH-2:0], D };
assign Q = r[L];
endmodule

67
tests/xilinx/xilinx_srl.ys Normal file
View File

@ -0,0 +1,67 @@
read_verilog xilinx_srl.v
design -save read
design -copy-to model $__XILINX_SHREG_
hierarchy -top xilinx_srl_static_test
prep
design -save gold
techmap
xilinx_srl -fixed
opt
# stat
# show -width
select -assert-count 1 t:$_DFF_P_
select -assert-count 2 t:$__XILINX_SHREG_
design -stash gate
design -import gold -as gold
design -import gate -as gate
design -copy-from model -as $__XILINX_SHREG_ \$__XILINX_SHREG_
prep
miter -equiv -flatten -make_assert -make_outputs gold gate miter
dump gate
sat -verify -prove-asserts -show-ports -seq 5 miter
#design -load gold
#stat
#design -load gate
#stat
##########
design -load read
design -copy-to model $__XILINX_SHREG_
hierarchy -top xilinx_srl_variable_test
prep
design -save gold
xilinx_srl -variable
opt
#stat
# show -width
# write_verilog -noexpr -norename
select -assert-count 1 t:$dff
select -assert-count 1 t:$dff r:WIDTH=1 %i
select -assert-count 2 t:$__XILINX_SHREG_
design -stash gate
design -import gold -as gold
design -import gate -as gate
design -copy-from model -as $__XILINX_SHREG_ \$__XILINX_SHREG_
prep
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts -show-ports -seq 5 miter
# design -load gold
# stat
# design -load gate
# stat