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gatemate: Add LUT tree library script 

Co-authored-by: Claire Xenia Wolf <claire@clairexen.net>
Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2021-12-07 13:41:39 +00:00 committed by myrtle
parent 7c756c9959
commit 38a24ec5cc
6 changed files with 591 additions and 6 deletions
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4
techlibs/gatemate/.gitignore vendored Normal file
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@ -0,0 +1,4 @@
lut_tree_cells.genlib
lut_tree_map.v
lut_tree_lib.mk

16
techlibs/gatemate/Makefile.inc
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@ -1,5 +1,6 @@
OBJS += techlibs/gatemate/synth_gatemate.o
OBJS += techlibs/gatemate/gatemate_foldinv.o
$(eval $(call add_share_file,share/gatemate,techlibs/gatemate/reg_map.v))
$(eval $(call add_share_file,share/gatemate,techlibs/gatemate/mux_map.v))
@ -12,3 +13,18 @@ $(eval $(call add_share_file,share/gatemate,techlibs/gatemate/brams_map.v))
$(eval $(call add_share_file,share/gatemate,techlibs/gatemate/brams.txt))
$(eval $(call add_share_file,share/gatemate,techlibs/gatemate/brams_init_20.vh))
$(eval $(call add_share_file,share/gatemate,techlibs/gatemate/brams_init_40.vh))
$(eval $(call add_share_file,share/gatemate,techlibs/gatemate/inv_map.v))
EXTRA_OBJS += techlibs/gatemate/lut_tree_lib.mk
.SECONDARY: techlibs/gatemate/lut_tree_lib.mk
techlibs/gatemate/lut_tree_lib.mk: techlibs/gatemate/make_lut_tree_lib.py
$(Q) mkdir -p techlibs/gatemate
$(P) $(PYTHON_EXECUTABLE) $<
$(Q) touch $@
techlibs/gatemate/lut_tree_cells.genlib: techlibs/gatemate/lut_tree_lib.mk
techlibs/gatemate/lut_tree_map.v: techlibs/gatemate/lut_tree_lib.mk
$(eval $(call add_gen_share_file,share/gatemate,techlibs/gatemate/lut_tree_cells.genlib))
$(eval $(call add_gen_share_file,share/gatemate,techlibs/gatemate/lut_tree_map.v))

218
techlibs/gatemate/gatemate_foldinv.cc Normal file
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@ -0,0 +1,218 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2021 gatecat <gatecat@ds0.me>
* Copyright (C) 2021 Cologne Chip AG <support@colognechip.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
struct LUTPin {
int input_bit;
IdString init_param;
};
struct LUTType {
dict<IdString, LUTPin> inputs;
IdString output_param;
};
static const dict<IdString, LUTType> lut_types = {
{ID(CC_LUT2), {{
{ID(I0), {0, ID(INIT)}},
{ID(I1), {1, ID(INIT)}},
}, ID(INIT)}},
{ID(CC_L2T4), {{
{ID(I0), {0, ID(INIT_L00)}},
{ID(I1), {1, ID(INIT_L00)}},
{ID(I2), {0, ID(INIT_L01)}},
{ID(I3), {1, ID(INIT_L01)}},
}, ID(INIT_L10)}},
{ID(CC_L2T5), {{
{ID(I0), {0, ID(INIT_L02)}},
{ID(I1), {1, ID(INIT_L02)}},
{ID(I2), {0, ID(INIT_L03)}},
{ID(I3), {1, ID(INIT_L03)}},
{ID(I4), {0, ID(INIT_L20)}},
}, ID(INIT_L20)}},
};
struct FoldInvWorker {
FoldInvWorker(Module *module) : module(module), sigmap(module) {};
Module *module;
SigMap sigmap;
// Mapping from inverter output to inverter input
dict<SigBit, SigBit> inverted_bits;
// Mapping from inverter input to inverter
dict<SigBit, Cell*> inverter_input;
void find_inverted_bits()
{
for (auto cell : module->selected_cells()) {
if (cell->type != ID($__CC_NOT))
continue;
SigBit a = sigmap(cell->getPort(ID::A)[0]);
SigBit y = sigmap(cell->getPort(ID::Y)[0]);
inverted_bits[y] = a;
inverter_input[a] = cell;
}
}
Const invert_lut_input(Const lut, int bit)
{
Const result(State::S0, GetSize(lut));
for (int i = 0; i < GetSize(lut); i++) {
int j = i ^ (1 << bit);
result[j] = lut[i];
}
return result;
}
Const invert_lut_output(Const lut)
{
Const result(State::S0, GetSize(lut));
for (int i = 0; i < GetSize(lut); i++)
result[i] = (lut[i] == State::S1) ? State::S0 : State::S1;
return result;
}
void fold_input_inverters()
{
for (auto cell : module->selected_cells()) {
auto found_type = lut_types.find(cell->type);
if (found_type == lut_types.end())
continue;
const auto &type = found_type->second;
for (const auto &ipin : type.inputs) {
if (!cell->hasPort(ipin.first))
continue;
auto sig = cell->getPort(ipin.first);
if (GetSize(sig) == 0)
continue;
SigBit bit = sigmap(sig[0]);
auto inv = inverted_bits.find(bit);
if (inv == inverted_bits.end())
continue; // not the output of an inverter
// Rewire to inverter input
cell->unsetPort(ipin.first);
cell->setPort(ipin.first, inv->second);
// Rewrite init
cell->setParam(ipin.second.init_param,
invert_lut_input(cell->getParam(ipin.second.init_param), ipin.second.input_bit));
}
}
}
void fold_output_inverters()
{
pool<SigBit> used_bits;
// Find bits that are actually used
for (auto cell : module->selected_cells()) {
for (auto conn : cell->connections()) {
if (cell->output(conn.first))
continue;
for (auto bit : sigmap(conn.second))
used_bits.insert(bit);
}
}
// Find LUTs driving inverters
// (create a vector to avoid iterate-and-modify issues)
std::vector<std::pair<Cell *, Cell*>> lut_inv;
for (auto cell : module->selected_cells()) {
auto found_type = lut_types.find(cell->type);
if (found_type == lut_types.end())
continue;
if (!cell->hasPort(ID::O))
continue;
auto o_sig = cell->getPort(ID::O);
if (GetSize(o_sig) == 0)
continue;
SigBit o = sigmap(o_sig[0]);
auto found_inv = inverter_input.find(o);
if (found_inv == inverter_input.end())
continue; // doesn't drive an inverter
lut_inv.emplace_back(cell, found_inv->second);
}
for (auto pair : lut_inv) {
Cell *orig_lut = pair.first;
Cell *inv = pair.second;
// Find the inverter output
SigBit inv_y = sigmap(inv->getPort(ID::Y)[0]);
// Inverter output might not actually be used; if all users were folded into inputs already
if (!used_bits.count(inv_y))
continue;
// Create a duplicate of the LUT with an inverted output
// (if the uninverted version becomes unused it will be swept away)
Cell *dup_lut = module->addCell(NEW_ID, orig_lut->type);
inv->unsetPort(ID::Y);
dup_lut->setPort(ID::O, inv_y);
for (auto conn : orig_lut->connections()) {
if (conn.first == ID::O)
continue;
dup_lut->setPort(conn.first, conn.second);
}
for (auto param : orig_lut->parameters) {
if (param.first == lut_types.at(orig_lut->type).output_param)
dup_lut->parameters[param.first] = invert_lut_output(param.second);
else
dup_lut->parameters[param.first] = param.second;
}
}
}
void operator()()
{
find_inverted_bits();
fold_input_inverters();
fold_output_inverters();
}
};
struct GatemateFoldInvPass : public Pass {
GatemateFoldInvPass() : Pass("gatemate_foldinv", "fold inverters into Gatemate LUT trees") { }
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" gatemate_foldinv [selection]\n");
log("\n");
log("\n");
log("This pass searches for $__CC_NOT cells and folds them into CC_LUT2, CC_L2T4\n");
log("and CC_L2T5 cells as created by LUT tree mapping.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
log_header(design, "Executing GATEMATE_FOLDINV pass (folding LUT tree inverters).\n");
size_t argidx = 1;
extra_args(args, argidx, design);
for (Module *module : design->selected_modules()) {
FoldInvWorker worker(module);
worker();
}
}
} GatemateFoldInvPass;
PRIVATE_NAMESPACE_END

4
techlibs/gatemate/inv_map.v Normal file
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@ -0,0 +1,4 @@
// Any inverters not folded into LUTs are mapped to a LUT of their own
module \$__CC_NOT (input A, output Y);
CC_LUT1 #(.INIT(2'b01)) _TECHMAP_REPLACE_ (.I0(A), .O(Y));
endmodule

323
techlibs/gatemate/make_lut_tree_lib.py Normal file
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@ -0,0 +1,323 @@
#!/usr/bin/env python3
class FNode:
def __init__(self, fun, *args):
self.fun = fun
self.args = args
if len(self.args) == 0:
assert fun not in ("BUF", "NOT", "AND", "OR", "XOR", "MUX")
if len(self.args) == 1:
assert fun in ("BUF", "NOT")
if len(self.args) == 2:
assert fun in ("AND", "OR", "XOR")
if len(self.args) == 3:
assert fun in ("MUX")
def __str__(self):
if len(self.args) == 0:
return self.fun
if self.fun == "NOT" and len(self.args[0].args) == 0:
return "!" + self.args[0].fun
return self.fun + "(" + ",".join([str(a) for a in self.args]) + ")"
def as_genlib_term(self):
if len(self.args) == 0:
return self.fun
if self.fun == "NOT":
assert len(self.args[0].args) == 0
return "!" + self.args[0].fun
if self.fun == "AND":
return "(" + self.args[0].as_genlib_term() + "*" + self.args[1].as_genlib_term() + ")"
if self.fun == "OR":
return "(" + self.args[0].as_genlib_term() + "+" + self.args[1].as_genlib_term() + ")"
assert False
def mapMux(self):
if self.fun == "MUX":
A, B, C = self.args
return OR(AND(A, NOT(C)), AND(B, C)).mapMux()
return FNode(self.fun, *[a.mapMux() for a in self.args])
def mapXor(self):
if self.fun == "XOR":
A, B = self.args
return OR(AND(A, NOT(B)), AND(NOT(A), B)).mapXor()
return FNode(self.fun, *[a.mapXor() for a in self.args])
def mapNot(self):
if self.fun == "BUF":
return self.arg1.mapNot()
if self.fun == "NOT":
if self.args[0].fun == "AND":
return OR(NOT(self.args[0].args[0]),NOT(self.args[0].args[1])).mapNot()
if self.args[0].fun == "OR":
return AND(NOT(self.args[0].args[0]),NOT(self.args[0].args[1])).mapNot()
if self.args[0].fun == "NOT":
return self.args[0].args[0].mapNot()
return FNode(self.fun, *[a.mapNot() for a in self.args])
def map(self):
n = self
n = n.mapMux()
n = n.mapXor()
n = n.mapNot()
return n
def isInv(self):
if len(self.args) == 0:
return False
if self.fun == "XOR":
return False
if self.fun == "NOT":
return self.args[0].isNonInv()
for a in self.args:
if not a.isInv():
return False
return True
def isNonInv(self):
if len(self.args) == 0:
return True
if self.fun == "XOR":
return False
if self.fun == "NOT":
return self.args[0].isInv()
for a in self.args:
if not a.isNonInv():
return False
return True
A = FNode("A")
B = FNode("B")
C = FNode("C")
D = FNode("D")
E = FNode("E")
def BUF(arg): return FNode("BUF", arg)
def NOT(arg): return FNode("NOT", arg)
def AND(arg1, arg2): return FNode("AND", arg1, arg2)
def OR(arg1, arg2): return FNode( "OR", arg1, arg2)
def XOR(arg1, arg2): return FNode("XOR", arg1, arg2)
def MUX(arg1, arg2, arg3): return FNode("MUX", arg1, arg2, arg3)
# Genlib Format:
#
# GATE <cell-name> <cell-area> <cell-logic-function>
#
# PIN <pin-name> <phase> <input-load> <max-load>
# <rise-block-delay> <rise-fanout-delay>
# <fall-block-delay> <fall-fanout-delay>
#
# phase:
# INV, NONINV, or UNKNOWN
#
# cell-logic-function:
# <output> = <term with *(AND), +(OR), !(NOT)>
cells = [
["$__CC_BUF", 5, A],
["$__CC_NOT", 0, NOT(A)],
["$__CC_MUX", 5, MUX(A, B, C)],
]
base_cells = [
["$__CC2_A", AND(A, B)],
["$__CC2_O", OR(A, B)],
["$__CC2_X", XOR(A, B)],
["$__CC3_AA", AND(AND(A, B), C)],
["$__CC3_OO", OR( OR(A, B), C)],
["$__CC3_XX", XOR(XOR(A, B), C)],
["$__CC3_AO", OR(AND(A, B), C)],
["$__CC3_OA", AND( OR(A, B), C)],
["$__CC3_AX", XOR(AND(A, B), C)],
["$__CC3_XA", AND(XOR(A, B), C)],
# ["$__CC3_AAA", AND(AND(A,B),AND(A,C))],
# ["$__CC3_AXA", XOR(AND(A,B),AND(A,C))],
# ["$__CC3_XAX", AND(XOR(A,B),XOR(A,C))],
# ["$__CC3_AAX", AND(AND(A,B),XOR(A,C))],
# ["$__CC3_AXX", XOR(AND(A,B),XOR(A,C))],
# ["$__CC3_XXX", XOR(XOR(A,B),XOR(A,C))],
# ["$__CC3_AAO", AND(AND(A,B), OR(A,C))],
# ["$__CC3_AOA", OR(AND(A,B),AND(A,C))],
# ["$__CC3_AOX", OR(AND(A,B),XOR(A,C))],
# ["$__CC3_AAA_N", AND(AND(A,B),AND(NOT(A),C))],
# ["$__CC3_AXA_N", XOR(AND(A,B),AND(NOT(A),C))],
# ["$__CC3_XAX_N", AND(XOR(A,B),XOR(NOT(A),C))],
# ["$__CC3_AAX_N", AND(AND(A,B),XOR(NOT(A),C))],
# ["$__CC3_AXX_N", XOR(AND(A,B),XOR(NOT(A),C))],
# ["$__CC3_XXX_N", XOR(XOR(A,B),XOR(NOT(A),C))],
# ["$__CC3_AAO_N", AND(AND(A,B), OR(NOT(A),C))],
# ["$__CC3_AOA_N", OR(AND(A,B),AND(NOT(A),C))],
# ["$__CC3_AOX_N", OR(AND(A,B),XOR(NOT(A),C))],
["$__CC4_AAA", AND(AND(A,B),AND(C,D))],
["$__CC4_AXA", XOR(AND(A,B),AND(C,D))],
["$__CC4_XAX", AND(XOR(A,B),XOR(C,D))],
["$__CC4_AAX", AND(AND(A,B),XOR(C,D))],
["$__CC4_AXX", XOR(AND(A,B),XOR(C,D))],
["$__CC4_XXX", XOR(XOR(A,B),XOR(C,D))],
["$__CC4_AAO", AND(AND(A,B), OR(C,D))],
["$__CC4_AOA", OR(AND(A,B),AND(C,D))],
["$__CC4_AOX", OR(AND(A,B),XOR(C,D))],
]
for name, expr in base_cells:
cells.append([name, 10, expr])
name = (name
.replace("$__CC4_", "$__CC5_")
.replace("$__CC3_", "$__CC4_")
.replace("$__CC2_", "$__CC3_"))
# Cells such as $__CC4_AA_A are redundant, as $__CC4_AAA is equivalent
if name not in ("$__CC4_AA", "$__CC3_A"):
cells.append([name + "_A", 12, AND(E, expr)])
if name not in ("$__CC4_OO", "$__CC3_O"):
cells.append([name + "_O", 12, OR(E, expr)])
if name not in ("$__CC4_XX", "$__CC3_X"):
cells.append([name + "_X", 12, XOR(E, expr)])
with open("techlibs/gatemate/lut_tree_cells.genlib", "w") as glf:
def mkGate(name, cost, expr, max_load=9999, block_delay = 10, fanout_delay = 5):
name = name.replace(" ", "")
expr = expr.map()
phase = "UNKNOWN"
if expr.isInv(): phase = "INV"
if expr.isNonInv(): phase = "NONINV"
print("", file=glf)
print("GATE %s %d Y=%s;" % (name, cost, expr.as_genlib_term()), file=glf)
print("PIN * %s 1 %d %d %d %d %d" % (phase, max_load, block_delay, fanout_delay, block_delay, fanout_delay), file=glf)
print("GATE $__ZERO 0 Y=CONST0;", file=glf)
print("GATE $__ONE 0 Y=CONST1;", file=glf)
for name, cost, expr in cells:
mkGate(name, cost, expr)
class LUTTreeNode:
def __init__(self, name, width, inputs=None):
self.name = name
self.width = width
self.inputs = inputs
def is_input(self):
return self.width == 0
def map(self, expr, params, ports):
if self.is_input():
# Input to LUT tree
if expr is None:
ports[self.name] = "" # disconnected input
else:
assert(len(expr.args) == 0)
ports[self.name] = expr.fun
return
if expr is None:
# Unused part of tree
params[self.name] = "4'b0000"
for i in self.inputs:
i.map(None, params, ports)
return
elif len(expr.args) == 0:
# Input to the expression; but not LUT tree
# Insert a route through
params[self.name] = "4'b1010"
self.inputs[0].map(expr, params, ports)
for i in self.inputs[1:]:
i.map(None, params, ports)
return
# Map uphill LUTs; uninverting arguments and keeping track of that if needed
arg_inv = []
for (i, arg) in zip(self.inputs, expr.args):
if arg.fun == "NOT":
i.map(arg.args[0], params, ports)
arg_inv.append(True)
else:
i.map(arg, params, ports)
arg_inv.append(False)
# Determine base init value
assert self.width == 2
if expr.fun == "AND":
init = 0b1000
elif expr.fun == "OR":
init = 0b1110
elif expr.fun == "XOR":
init = 0b0110
else:
assert False, expr.fun
# Swap bits if init inverted
swapped_init = 0b0000
for b in range(4):
if ((init >> b) & 0x1) == 0: continue
for i in range(2):
if arg_inv[i]:
b ^= (1 << i)
swapped_init |= (1 << b)
# Set init param
params[self.name] = "4'b{:04b}".format(swapped_init)
def LUT2(name, i0, i1): return LUTTreeNode(name, 2, [i0, i1])
def I(name): return LUTTreeNode(name, 0)
lut_prims = {
"CC_LUT2": LUT2("INIT", I("I0"), I("I1")),
"CC_L2T4": LUT2(
"INIT_L10",
LUT2("INIT_L00", I("I0"), I("I1")),
LUT2("INIT_L01", I("I2"), I("I3")),
),
"CC_L2T5": LUT2(
"INIT_L20", I("I4"), LUT2("INIT_L11",
LUT2("INIT_L02", I("I0"), I("I1")),
LUT2("INIT_L03", I("I2"), I("I3")),
)
)
}
with open("techlibs/gatemate/lut_tree_map.v", "w") as vf:
# Non-automatic rules
print("""
module \\$__ZERO (output Y); assign Y = 1'b0; endmodule
module \\$__ONE (output Y); assign Y = 1'b1; endmodule
module \\$__CC_BUF (input A, output Y); assign Y = A; endmodule
module \\$__CC_MUX (input A, B, C, output Y);
CC_MX2 _TECHMAP_REPLACE_ (
.D0(A), .D1(B), .S0(C),
.Y(Y)
);
endmodule
""", file=vf)
for name, cost, expr in cells:
expr = expr.mapMux().mapNot() # Don't map XOR
if name in ("$__CC_BUF", "$__CC_NOT", "$__CC_MUX"):
# Special cases
continue
if name.startswith("$__CC2_"):
prim = "CC_LUT2"
elif name.startswith("$__CC5_") or (name.startswith("$__CC4_") and cost == 12):
prim = "CC_L2T5"
else:
prim = "CC_L2T4"
ports = {}
params = {}
lut_prims[prim].map(expr, params, ports)
print("", file=vf)
print("module \\%s (input %s, output Y);" % (name,
", ".join(sorted(set(x for x in ports.values() if x)))), file=vf)
print(" %s #(" % prim, file=vf)
for k, v in sorted(params.items(), key=lambda x: x[0]):
print(" .%s(%s)," % (k, v), file=vf)
print(" ) _TECHMAP_REPLACE_ (", file=vf)
print(" %s," % ", ".join(".%s(%s)" % (k, v) for k, v in sorted(ports.items(), key=lambda x:x[0])),
file=vf)
print(" .O(Y)", file=vf)
print(" );", file=vf)
print("endmodule", file=vf)

26
techlibs/gatemate/synth_gatemate.cc
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@ -67,7 +67,10 @@ struct SynthGateMatePass : public ScriptPass
log("\n");
log(" -nomx8, -nomx4\n");
log(" do not use CC_MX{8,4} multiplexer cells in output netlist.\n");
log("\n");;
log("\n");
log(" -luttree\n");
log(" use new LUT tree mapping approach (EXPERIMENTAL).\n");
log("\n");
log(" -dff\n");
log(" run 'abc' with -dff option\n");
log("\n");
@ -87,7 +90,7 @@ struct SynthGateMatePass : public ScriptPass
}
string top_opt, vlog_file, json_file;
bool noflatten, nobram, noaddf, nomult, nomx4, nomx8, dff, retime, noiopad, noclkbuf;
bool noflatten, nobram, noaddf, nomult, nomx4, nomx8, luttree, dff, retime, noiopad, noclkbuf;
void clear_flags() override
{
@ -100,6 +103,7 @@ struct SynthGateMatePass : public ScriptPass
nomult = false;
nomx4 = false;
nomx8 = false;
luttree = false;
dff = false;
retime = false;
noiopad = false;
@ -158,6 +162,10 @@ struct SynthGateMatePass : public ScriptPass
nomx8 = true;
continue;
}
if (args[argidx] == "-luttree") {
luttree = true;
continue;
}
if (args[argidx] == "-dff") {
dff = true;
continue;
@ -298,11 +306,23 @@ struct SynthGateMatePass : public ScriptPass
if (check_label("map_luts"))
{
if (luttree || help_mode) {
std::string abc_args = " -genlib +/gatemate/lut_tree_cells.genlib";
if (dff) {
abc_args += " -dff";
}
run("abc " + abc_args, "(with -luttree)");
run("techmap -map +/gatemate/lut_tree_map.v", "(with -luttree)");
run("gatemate_foldinv", "(with -luttree)");
run("techmap -map +/gatemate/inv_map.v", "(with -luttree)");
}
if (!luttree || help_mode) {
std::string abc_args = " -dress -lut 4";
if (dff) {
abc_args += " -dff";
}
run("abc " + abc_args);
run("abc " + abc_args, "(without -luttree)");
}
run("clean");
}