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yosys/techlibs/ice40/ice40_dsp.cc
Krystine Sherwin 0ec5f1b756
pmgen: Move passes out of pmgen folder 
- Techlib pmgens are now in relevant techlibs/*.
- `peepopt` pmgens are now in passes/opt.
- `test_pmgen` is still in passes/pmgen.
- Update `Makefile.inc` and `.gitignore` file(s) to match new `*_pm.h` location,
  as well as the `#include`s.
- Change default `%_pm.h` make target to `techlibs/%_pm.h` and move it to the
  top level Makefile.
- Update pmgen target to use `$(notdir $*)` (where `$*` is the part of the file
  name that matched the '%' in the target) instead of `$(subst _pm.h,,$(notdir
  $@))`.
2025-01-31 15:18:28 +13:00

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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.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
#include "techlibs/ice40/ice40_dsp_pm.h"
void create_ice40_dsp(ice40_dsp_pm &pm)
{
auto &st = pm.st_ice40_dsp;
log("Checking %s.%s for iCE40 DSP inference.\n", log_id(pm.module), log_id(st.mul));
log_debug("ffA: %s\n", log_id(st.ffA, "--"));
log_debug("ffB: %s\n", log_id(st.ffB, "--"));
log_debug("ffCD: %s\n", log_id(st.ffCD, "--"));
log_debug("mul: %s\n", log_id(st.mul, "--"));
log_debug("ffFJKG: %s\n", log_id(st.ffFJKG, "--"));
log_debug("ffH: %s\n", log_id(st.ffH, "--"));
log_debug("add: %s\n", log_id(st.add, "--"));
log_debug("mux: %s\n", log_id(st.mux, "--"));
log_debug("ffO: %s\n", log_id(st.ffO, "--"));
log_debug("\n");
if (GetSize(st.sigA) > 16) {
log(" input A (%s) is too large (%d > 16).\n", log_signal(st.sigA), GetSize(st.sigA));
return;
}
if (GetSize(st.sigB) > 16) {
log(" input B (%s) is too large (%d > 16).\n", log_signal(st.sigB), GetSize(st.sigB));
return;
}
if (GetSize(st.sigO) > 33) {
log(" adder/accumulator (%s) is too large (%d > 33).\n", log_signal(st.sigO), GetSize(st.sigO));
return;
}
if (GetSize(st.sigH) > 32) {
log(" output (%s) is too large (%d > 32).\n", log_signal(st.sigH), GetSize(st.sigH));
return;
}
Cell *cell = st.mul;
if (cell->type == ID($mul)) {
log(" replacing %s with SB_MAC16 cell.\n", log_id(st.mul->type));
cell = pm.module->addCell(NEW_ID, ID(SB_MAC16));
pm.module->swap_names(cell, st.mul);
}
else log_assert(cell->type == ID(SB_MAC16));
// SB_MAC16 Input Interface
SigSpec A = st.sigA;
A.extend_u0(16, st.mul->getParam(ID::A_SIGNED).as_bool());
log_assert(GetSize(A) == 16);
SigSpec B = st.sigB;
B.extend_u0(16, st.mul->getParam(ID::B_SIGNED).as_bool());
log_assert(GetSize(B) == 16);
SigSpec CD = st.sigCD;
if (CD.empty())
CD = RTLIL::Const(0, 32);
else
log_assert(GetSize(CD) == 32);
cell->setPort(ID::A, A);
cell->setPort(ID::B, B);
cell->setPort(ID::C, CD.extract(16, 16));
cell->setPort(ID::D, CD.extract(0, 16));
cell->setParam(ID(A_REG), st.ffA ? State::S1 : State::S0);
cell->setParam(ID(B_REG), st.ffB ? State::S1 : State::S0);
cell->setParam(ID(C_REG), st.ffCD ? State::S1 : State::S0);
cell->setParam(ID(D_REG), st.ffCD ? State::S1 : State::S0);
SigSpec AHOLD, BHOLD, CDHOLD;
if (st.ffA && st.ffA->hasPort(ID::EN))
AHOLD = st.ffA->getParam(ID::EN_POLARITY).as_bool() ? pm.module->Not(NEW_ID, st.ffA->getPort(ID::EN)) : st.ffA->getPort(ID::EN);
else
AHOLD = State::S0;
if (st.ffB && st.ffB->hasPort(ID::EN))
BHOLD = st.ffB->getParam(ID::EN_POLARITY).as_bool() ? pm.module->Not(NEW_ID, st.ffB->getPort(ID::EN)) : st.ffB->getPort(ID::EN);
else
BHOLD = State::S0;
if (st.ffCD && st.ffCD->hasPort(ID::EN))
CDHOLD = st.ffCD->getParam(ID::EN_POLARITY).as_bool() ? pm.module->Not(NEW_ID, st.ffCD->getPort(ID::EN)) : st.ffCD->getPort(ID::EN);
else
CDHOLD = State::S0;
cell->setPort(ID(AHOLD), AHOLD);
cell->setPort(ID(BHOLD), BHOLD);
cell->setPort(ID(CHOLD), CDHOLD);
cell->setPort(ID(DHOLD), CDHOLD);
SigSpec IRSTTOP, IRSTBOT;
if (st.ffA && st.ffA->hasPort(ID::ARST))
IRSTTOP = st.ffA->getParam(ID::ARST_POLARITY).as_bool() ? st.ffA->getPort(ID::ARST) : pm.module->Not(NEW_ID, st.ffA->getPort(ID::ARST));
else
IRSTTOP = State::S0;
if (st.ffB && st.ffB->hasPort(ID::ARST))
IRSTBOT = st.ffB->getParam(ID::ARST_POLARITY).as_bool() ? st.ffB->getPort(ID::ARST) : pm.module->Not(NEW_ID, st.ffB->getPort(ID::ARST));
else
IRSTBOT = State::S0;
cell->setPort(ID(IRSTTOP), IRSTTOP);
cell->setPort(ID(IRSTBOT), IRSTBOT);
if (st.clock != SigBit())
{
cell->setPort(ID::CLK, st.clock);
cell->setPort(ID(CE), State::S1);
cell->setParam(ID(NEG_TRIGGER), st.clock_pol ? State::S0 : State::S1);
log(" clock: %s (%s)", log_signal(st.clock), st.clock_pol ? "posedge" : "negedge");
if (st.ffA)
log(" ffA:%s", log_id(st.ffA));
if (st.ffB)
log(" ffB:%s", log_id(st.ffB));
if (st.ffCD)
log(" ffCD:%s", log_id(st.ffCD));
if (st.ffFJKG)
log(" ffFJKG:%s", log_id(st.ffFJKG));
if (st.ffH)
log(" ffH:%s", log_id(st.ffH));
if (st.ffO)
log(" ffO:%s", log_id(st.ffO));
log("\n");
}
else
{
cell->setPort(ID::CLK, State::S0);
cell->setPort(ID(CE), State::S0);
cell->setParam(ID(NEG_TRIGGER), State::S0);
}
// SB_MAC16 Cascade Interface
cell->setPort(ID(SIGNEXTIN), State::Sx);
cell->setPort(ID(SIGNEXTOUT), pm.module->addWire(NEW_ID));
cell->setPort(ID::CI, State::Sx);
cell->setPort(ID(ACCUMCI), State::Sx);
cell->setPort(ID(ACCUMCO), pm.module->addWire(NEW_ID));
// SB_MAC16 Output Interface
SigSpec O = st.sigO;
int O_width = GetSize(O);
if (O_width == 33) {
log_assert(st.add);
// If we have a signed multiply-add, then perform sign extension
if (st.add->getParam(ID::A_SIGNED).as_bool() && st.add->getParam(ID::B_SIGNED).as_bool())
pm.module->connect(O[32], O[31]);
else
cell->setPort(ID::CO, O[32]);
O.remove(O_width-1);
}
else
cell->setPort(ID::CO, pm.module->addWire(NEW_ID));
log_assert(GetSize(O) <= 32);
if (GetSize(O) < 32)
O.append(pm.module->addWire(NEW_ID, 32-GetSize(O)));
cell->setPort(ID::O, O);
bool accum = false;
if (st.add) {
accum = (st.ffO && st.add->getPort(st.addAB == ID::A ? ID::B : ID::A) == st.sigO);
if (accum)
log(" accumulator %s (%s)\n", log_id(st.add), log_id(st.add->type));
else
log(" adder %s (%s)\n", log_id(st.add), log_id(st.add->type));
cell->setPort(ID(ADDSUBTOP), st.add->type == ID($add) ? State::S0 : State::S1);
cell->setPort(ID(ADDSUBBOT), st.add->type == ID($add) ? State::S0 : State::S1);
} else {
cell->setPort(ID(ADDSUBTOP), State::S0);
cell->setPort(ID(ADDSUBBOT), State::S0);
}
SigSpec OHOLD;
if (st.ffO && st.ffO->hasPort(ID::EN))
OHOLD = st.ffO->getParam(ID::EN_POLARITY).as_bool() ? pm.module->Not(NEW_ID, st.ffO->getPort(ID::EN)) : st.ffO->getPort(ID::EN);
else
OHOLD = State::S0;
cell->setPort(ID(OHOLDTOP), OHOLD);
cell->setPort(ID(OHOLDBOT), OHOLD);
SigSpec ORST;
if (st.ffO && st.ffO->hasPort(ID::ARST))
ORST = st.ffO->getParam(ID::ARST_POLARITY).as_bool() ? st.ffO->getPort(ID::ARST) : pm.module->Not(NEW_ID, st.ffO->getPort(ID::ARST));
else
ORST = State::S0;
cell->setPort(ID(ORSTTOP), ORST);
cell->setPort(ID(ORSTBOT), ORST);
SigSpec acc_reset = State::S0;
if (st.mux) {
if (st.muxAB == ID::A)
acc_reset = st.mux->getPort(ID::S);
else
acc_reset = pm.module->Not(NEW_ID, st.mux->getPort(ID::S));
} else if (st.ffO && st.ffO->hasPort(ID::SRST)) {
acc_reset = st.ffO->getParam(ID::SRST_POLARITY).as_bool() ? st.ffO->getPort(ID::SRST) : pm.module->Not(NEW_ID, st.ffO->getPort(ID::SRST));
}
cell->setPort(ID(OLOADTOP), acc_reset);
cell->setPort(ID(OLOADBOT), acc_reset);
// SB_MAC16 Remaining Parameters
cell->setParam(ID(TOP_8x8_MULT_REG), st.ffFJKG ? State::S1 : State::S0);
cell->setParam(ID(BOT_8x8_MULT_REG), st.ffFJKG ? State::S1 : State::S0);
cell->setParam(ID(PIPELINE_16x16_MULT_REG1), st.ffFJKG ? State::S1 : State::S0);
cell->setParam(ID(PIPELINE_16x16_MULT_REG2), st.ffH ? State::S1 : State::S0);
cell->setParam(ID(TOPADDSUB_LOWERINPUT), Const(2, 2));
cell->setParam(ID(TOPADDSUB_UPPERINPUT), accum ? State::S0 : State::S1);
cell->setParam(ID(TOPADDSUB_CARRYSELECT), Const(3, 2));
cell->setParam(ID(BOTADDSUB_LOWERINPUT), Const(2, 2));
cell->setParam(ID(BOTADDSUB_UPPERINPUT), accum ? State::S0 : State::S1);
cell->setParam(ID(BOTADDSUB_CARRYSELECT), Const(0, 2));
cell->setParam(ID(MODE_8x8), State::S0);
cell->setParam(ID::A_SIGNED, st.mul->getParam(ID::A_SIGNED).as_bool());
cell->setParam(ID::B_SIGNED, st.mul->getParam(ID::B_SIGNED).as_bool());
if (st.ffO) {
if (st.o_lo)
cell->setParam(ID(TOPOUTPUT_SELECT), Const(st.add ? 0 : 3, 2));
else
cell->setParam(ID(TOPOUTPUT_SELECT), Const(1, 2));
st.ffO->connections_.at(ID::Q).replace(O, pm.module->addWire(NEW_ID, GetSize(O)));
cell->setParam(ID(BOTOUTPUT_SELECT), Const(1, 2));
}
else {
cell->setParam(ID(TOPOUTPUT_SELECT), Const(st.add ? 0 : 3, 2));
cell->setParam(ID(BOTOUTPUT_SELECT), Const(st.add ? 0 : 3, 2));
}
if (cell != st.mul)
pm.autoremove(st.mul);
else
pm.blacklist(st.mul);
pm.autoremove(st.ffFJKG);
pm.autoremove(st.add);
}
struct Ice40DspPass : public Pass {
Ice40DspPass() : Pass("ice40_dsp", "iCE40: map multipliers") { }
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" ice40_dsp [options] [selection]\n");
log("\n");
log("Map multipliers ($mul/SB_MAC16) and multiply-accumulate ($mul/SB_MAC16 + $add)\n");
log("cells into iCE40 DSP resources.\n");
log("Currently, only the 16x16 multiply mode is supported and not the 2 x 8x8 mode.\n");
log("\n");
log("Pack input registers (A, B, {C,D}; with optional hold), pipeline registers\n");
log("({F,J,K,G}, H), output registers (O -- full 32-bits or lower 16-bits only; with\n");
log("optional hold), and post-adder into the SB_MAC16 resource.\n");
log("\n");
log("Multiply-accumulate operations using the post-adder with feedback on the {C,D}\n");
log("input will be folded into the DSP. In this scenario only, resetting the\n");
log("the accumulator to an arbitrary value can be inferred to use the {C,D} input.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
log_header(design, "Executing ICE40_DSP pass (map multipliers).\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_dsp_pm(module, module->selected_cells()).run_ice40_dsp(create_ice40_dsp);
}
} Ice40DspPass;
PRIVATE_NAMESPACE_END
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