pattern ice40_dsp
state <SigBit> clock
-state <bool> clock_pol cd_signed
+state <bool> clock_pol cd_signed o_lo
state <SigSpec> sigA sigB sigCD sigH sigO
-state <Cell*> addAB muxAB
+state <Cell*> add mux
+state <IdString> addAB muxAB
+
+state <Cell*> ffA ffB ffCD
+state <Cell*> ffFJKG ffH ffO
+
+// subpattern
+state <bool> argSdff
+state <SigSpec> argQ argD
+udata <SigSpec> dffD dffQ
+udata <SigBit> dffclock
+udata <Cell*> dff
+udata <bool> dffclock_pol
match mul
select mul->type.in($mul, \SB_MAC16)
endmatch
code sigA sigB sigH
+ auto unextend = [](const SigSpec &sig) {
+ int i;
+ for (i = GetSize(sig)-1; i > 0; i--)
+ if (sig[i] != sig[i-1])
+ break;
+ // Do not remove non-const sign bit
+ ++i;
+ return sig.extract(0, i);
+ };
+ sigA = unextend(port(mul, \A));
+ sigB = unextend(port(mul, \B));
+
SigSpec O;
if (mul->type == $mul)
O = mul->getPort(\Y);
if (GetSize(O) <= 10)
reject;
- sigA = port(mul, \A);
- int i;
- for (i = GetSize(sigA)-1; i > 0; i--)
- if (sigA[i] != sigA[i-1])
- break;
- // Do not remove non-const sign bit
- if (sigA[i].wire)
- ++i;
- sigA.remove(i, GetSize(sigA)-i);
- sigB = port(mul, \B);
- for (i = GetSize(sigB)-1; i > 0; i--)
- if (sigB[i] != sigB[i-1])
- break;
- // Do not remove non-const sign bit
- if (sigB[i].wire)
- ++i;
- sigB.remove(i, GetSize(sigB)-i);
-
// Only care about those bits that are used
+ int i;
for (i = 0; i < GetSize(O); i++) {
if (nusers(O[i]) <= 1)
break;
sigH.append(O[i]);
}
+ // This sigM could have no users if downstream sinks (e.g. $add) is
+ // narrower than $mul result, for example
+ if (i == 0)
+ reject;
+
log_assert(nusers(O.extract_end(i)) <= 1);
endcode
-match ffA
- if mul->type != \SB_MAC16 || !param(mul, \A_REG).as_bool()
- select ffA->type.in($dff)
- filter GetSize(port(ffA, \Q)) >= GetSize(sigA)
- slice offset GetSize(port(ffA, \Q))
- filter offset+GetSize(sigA) <= GetSize(port(ffA, \Q)) && port(ffA, \Q).extract(offset, GetSize(sigA)) == sigA
- optional
-endmatch
-
-code sigA clock clock_pol
- if (ffA) {
- for (auto b : port(ffA, \Q))
- if (b.wire->get_bool_attribute(\keep))
- reject;
-
- clock = port(ffA, \CLK).as_bit();
- clock_pol = param(ffA, \CLK_POLARITY).as_bool();
-
- sigA.replace(port(ffA, \Q), port(ffA, \D));
+code argQ ffA sigA clock clock_pol
+ if (mul->type != \SB_MAC16 || !param(mul, \A_REG).as_bool()) {
+ argQ = sigA;
+ subpattern(in_dffe);
+ if (dff) {
+ ffA = dff;
+ clock = dffclock;
+ clock_pol = dffclock_pol;
+ sigA = dffD;
+ }
}
endcode
-match ffB
- if mul->type != \SB_MAC16 || !param(mul, \B_REG).as_bool()
- select ffB->type.in($dff)
- filter GetSize(port(ffB, \Q)) >= GetSize(sigB)
- slice offset GetSize(port(ffB, \Q))
- filter offset+GetSize(sigB) <= GetSize(port(ffB, \Q)) && port(ffB, \Q).extract(offset, GetSize(sigB)) == sigB
- optional
-endmatch
-
-code sigB clock clock_pol
- if (ffB) {
- for (auto b : port(ffB, \Q))
- if (b.wire->get_bool_attribute(\keep))
- reject;
-
- SigBit c = port(ffB, \CLK).as_bit();
- bool cp = param(ffB, \CLK_POLARITY).as_bool();
-
- if (clock != SigBit() && (c != clock || cp != clock_pol))
- reject;
-
- clock = c;
- clock_pol = cp;
-
- sigB.replace(port(ffB, \Q), port(ffB, \D));
+code argQ ffB sigB clock clock_pol
+ if (mul->type != \SB_MAC16 || !param(mul, \B_REG).as_bool()) {
+ argQ = sigB;
+ subpattern(in_dffe);
+ if (dff) {
+ ffB = dff;
+ clock = dffclock;
+ clock_pol = dffclock_pol;
+ sigB = dffD;
+ }
}
endcode
-match ffFJKG
- // Ensure pipeline register is not already used
- if mul->type != \SB_MAC16 || (!param(mul, \TOP_8x8_MULT_REG).as_bool() && !param(mul, \BOT_8x8_MULT_REG).as_bool() && !param(mul, \PIPELINE_16x16_MULT_REG1).as_bool() && !param(mul, \PIPELINE_16x16_MULT_REG2).as_bool())
- select ffFJKG->type.in($dff)
- select nusers(port(ffFJKG, \D)) == 2
- index <SigSpec> port(ffFJKG, \D) === sigH
- optional
-endmatch
-
-code sigH sigO clock clock_pol
- if (ffFJKG) {
- sigH = port(ffFJKG, \Q);
- for (auto b : sigH)
- if (b.wire->get_bool_attribute(\keep))
- reject;
-
- SigBit c = port(ffFJKG, \CLK).as_bit();
- bool cp = param(ffFJKG, \CLK_POLARITY).as_bool();
-
- if (clock != SigBit() && (c != clock || cp != clock_pol))
- reject;
+code argD argSdff ffFJKG sigH clock clock_pol
+ if (nusers(sigH) == 2 &&
+ (mul->type != \SB_MAC16 ||
+ (!param(mul, \TOP_8x8_MULT_REG).as_bool() && !param(mul, \BOT_8x8_MULT_REG).as_bool() && !param(mul, \PIPELINE_16x16_MULT_REG1).as_bool() && !param(mul, \PIPELINE_16x16_MULT_REG1).as_bool()))) {
+ argD = sigH;
+ argSdff = false;
+ subpattern(out_dffe);
+ if (dff) {
+ // F/J/K/G do not have a CE-like (hold) input
+ if (dff->hasPort(\EN))
+ goto reject_ffFJKG;
+
+ // Reset signal of F/J (IRSTTOP) and K/G (IRSTBOT)
+ // shared with A and B
+ if (ffA) {
+ if (ffA->hasPort(\ARST) != dff->hasPort(\ARST))
+ goto reject_ffFJKG;
+ if (ffA->hasPort(\ARST)) {
+ if (port(ffA, \ARST) != port(dff, \ARST))
+ goto reject_ffFJKG;
+ if (param(ffA, \ARST_POLARITY) != param(dff, \ARST_POLARITY))
+ goto reject_ffFJKG;
+ }
+ }
+ if (ffB) {
+ if (ffB->hasPort(\ARST) != dff->hasPort(\ARST))
+ goto reject_ffFJKG;
+ if (ffB->hasPort(\ARST)) {
+ if (port(ffB, \ARST) != port(dff, \ARST))
+ goto reject_ffFJKG;
+ if (param(ffB, \ARST_POLARITY) != param(dff, \ARST_POLARITY))
+ goto reject_ffFJKG;
+ }
+ }
+
+ ffFJKG = dff;
+ clock = dffclock;
+ clock_pol = dffclock_pol;
+ sigH = dffQ;
+
+reject_ffFJKG: ;
+ }
+ }
+endcode
- clock = c;
- clock_pol = cp;
+code argD argSdff ffH sigH sigO clock clock_pol
+ if (ffFJKG && nusers(sigH) == 2 &&
+ (mul->type != \SB_MAC16 || !param(mul, \PIPELINE_16x16_MULT_REG2).as_bool())) {
+ argD = sigH;
+ argSdff = false;
+ subpattern(out_dffe);
+ if (dff) {
+ // H does not have a CE-like (hold) input
+ if (dff->hasPort(\EN))
+ goto reject_ffH;
+
+ // Reset signal of H (IRSTBOT) shared with B
+ if (ffB->hasPort(\ARST) != dff->hasPort(\ARST))
+ goto reject_ffH;
+ if (ffB->hasPort(\ARST)) {
+ if (port(ffB, \ARST) != port(dff, \ARST))
+ goto reject_ffH;
+ if (param(ffB, \ARST_POLARITY) != param(dff, \ARST_POLARITY))
+ goto reject_ffH;
+ }
+
+ ffH = dff;
+ clock = dffclock;
+ clock_pol = dffclock_pol;
+ sigH = dffQ;
+
+reject_ffH: ;
+ }
}
sigO = sigH;
endcode
-match addA
- select addA->type.in($add)
- select nusers(port(addA, \A)) == 2
- filter param(addA, \A_WIDTH).as_int() <= GetSize(sigH)
- //index <SigSpec> port(addA, \A) === sigH.extract(0, param(addA, \A_WIDTH).as_int())
- filter port(addA, \A) == sigH.extract(0, param(addA, \A_WIDTH).as_int())
- optional
-endmatch
+match add
+ if mul->type != \SB_MAC16 || (param(mul, \TOPOUTPUT_SELECT).as_int() == 3 && param(mul, \BOTOUTPUT_SELECT).as_int() == 3)
+
+ select add->type.in($add)
+ choice <IdString> AB {\A, \B}
+ select nusers(port(add, AB)) == 2
-match addB
- if !addA
- select addB->type.in($add, $sub)
- select nusers(port(addB, \B)) == 2
- filter param(addB, \B_WIDTH).as_int() <= GetSize(sigH)
- //index <SigSpec> port(addB, \B) === sigH.extract(0, param(addB, \B_WIDTH).as_int())
- filter port(addB, \B) == sigH.extract(0, param(addB, \B_WIDTH).as_int())
+ index <SigBit> port(add, AB)[0] === sigH[0]
+ filter GetSize(port(add, AB)) <= GetSize(sigH)
+ filter port(add, AB) == sigH.extract(0, GetSize(port(add, AB)))
+ filter nusers(sigH.extract_end(GetSize(port(add, AB)))) <= 1
+ set addAB AB
optional
endmatch
-code addAB sigCD sigO cd_signed
- if (addA) {
- addAB = addA;
- sigCD = port(addAB, \B);
- cd_signed = param(addAB, \B_SIGNED).as_bool();
- }
- else if (addB) {
- addAB = addB;
- sigCD = port(addAB, \A);
- cd_signed = param(addAB, \A_SIGNED).as_bool();
- }
- if (addAB) {
- if (mul->type == \SB_MAC16) {
- // Ensure that adder is not used
- if (param(mul, \TOPOUTPUT_SELECT).as_int() != 3 ||
- param(mul, \BOTOUTPUT_SELECT).as_int() != 3)
- reject;
- }
+code sigCD sigO cd_signed
+ if (add) {
+ sigCD = port(add, addAB == \A ? \B : \A);
+ cd_signed = param(add, addAB == \A ? \B_SIGNED : \A_SIGNED).as_bool();
int natural_mul_width = GetSize(sigA) + GetSize(sigB);
int actual_mul_width = GetSize(sigH);
if ((actual_acc_width > actual_mul_width) && (natural_mul_width > actual_mul_width))
reject;
// If accumulator, check adder width and signedness
- if (sigCD == sigH && (actual_acc_width != actual_mul_width) && (param(mul, \A_SIGNED).as_bool() != param(addAB, \A_SIGNED).as_bool()))
+ if (sigCD == sigH && (actual_acc_width != actual_mul_width) && (param(mul, \A_SIGNED).as_bool() != param(add, \A_SIGNED).as_bool()))
reject;
- sigO = port(addAB, \Y);
+ sigO = port(add, \Y);
}
endcode
-match muxA
- select muxA->type.in($mux)
- index <int> nusers(port(muxA, \A)) === 2
- index <SigSpec> port(muxA, \A) === sigO
+match mux
+ select mux->type == $mux
+ choice <IdString> AB {\A, \B}
+ select nusers(port(mux, AB)) == 2
+ index <SigSpec> port(mux, AB) === sigO
+ set muxAB AB
optional
endmatch
-match muxB
- if !muxA
- select muxB->type.in($mux)
- index <int> nusers(port(muxB, \B)) === 2
- index <SigSpec> port(muxB, \B) === sigO
- optional
-endmatch
-
-code muxAB sigO
- if (muxA)
- muxAB = muxA;
- else if (muxB)
- muxAB = muxB;
- if (muxAB)
- sigO = port(muxAB, \Y);
+code sigO
+ if (mux)
+ sigO = port(mux, \Y);
endcode
-match ffO
- // Ensure that register is not already used
- if mul->type != \SB_MAC16 || (mul->parameters.at(\TOPOUTPUT_SELECT, 0).as_int() != 1 && mul->parameters.at(\BOTOUTPUT_SELECT, 0).as_int() != 1)
- // Ensure that OLOADTOP/OLOADBOT is unused or zero
- if mul->type != \SB_MAC16 || (mul->connections_.at(\OLOADTOP, State::S0).is_fully_zero() && mul->connections_.at(\OLOADBOT, State::S0).is_fully_zero())
- if nusers(sigO) == 2
- select ffO->type.in($dff)
- filter GetSize(port(ffO, \D)) >= GetSize(sigO)
- slice offset GetSize(port(ffO, \D))
- filter offset+GetSize(sigO) <= GetSize(port(ffO, \D)) && port(ffO, \D).extract(offset, GetSize(sigO)) == sigO
- optional
-endmatch
-
-match ffO_lo
- if !ffO && GetSize(sigO) > 16
- // Ensure that register is not already used
- if mul->type != \SB_MAC16 || (mul->parameters.at(\TOPOUTPUT_SELECT, 0).as_int() != 1 && mul->parameters.at(\BOTOUTPUT_SELECT, 0).as_int() != 1)
- // Ensure that OLOADTOP/OLOADBOT is unused or zero
- if mul->type != \SB_MAC16 || (mul->connections_.at(\OLOADTOP, State::S0).is_fully_zero() && mul->connections_.at(\OLOADBOT, State::S0).is_fully_zero())
- if nusers(sigO.extract(0, 16)) == 2
- select ffO_lo->type.in($dff)
- filter GetSize(port(ffO_lo, \D)) >= 16
- slice offset GetSize(port(ffO_lo, \D))
- filter offset+GetSize(sigO) <= GetSize(port(ffO_lo, \D)) && port(ffO_lo, \D).extract(offset, 16) == sigO.extract(0, 16)
- optional
-endmatch
+code argD argSdff ffO sigO sigCD clock clock_pol cd_signed o_lo
+ if (mul->type != \SB_MAC16 ||
+ // Ensure that register is not already used
+ ((param(mul, \TOPOUTPUT_SELECT).as_int() != 1 && param(mul, \BOTOUTPUT_SELECT).as_int() != 1) &&
+ // Ensure that OLOADTOP/OLOADBOT is unused or zero
+ (port(mul, \OLOADTOP, State::S0).is_fully_zero() && port(mul, \OLOADBOT, State::S0).is_fully_zero()))) {
-code ffO clock clock_pol sigO sigCD cd_signed
- if (ffO_lo) {
- log_assert(!ffO);
- ffO = ffO_lo;
- }
- if (ffO) {
- for (auto b : port(ffO, \Q))
- if (b.wire->get_bool_attribute(\keep))
- reject;
+ dff = nullptr;
- SigBit c = port(ffO, \CLK).as_bit();
- bool cp = param(ffO, \CLK_POLARITY).as_bool();
+ // First try entire sigO
+ if (nusers(sigO) == 2) {
+ argD = sigO;
+ argSdff = !mux;
+ subpattern(out_dffe);
+ }
- if (clock != SigBit() && (c != clock || cp != clock_pol))
- reject;
+ // Otherwise try just its least significant 16 bits
+ if (!dff && GetSize(sigO) > 16) {
+ argD = sigO.extract(0, 16);
+ if (nusers(argD) == 2) {
+ argSdff = !mux;
+ subpattern(out_dffe);
+ o_lo = dff;
+ }
+ }
- clock = c;
- clock_pol = cp;
+ if (dff) {
+ ffO = dff;
+ clock = dffclock;
+ clock_pol = dffclock_pol;
- sigO.replace(port(ffO, \D), port(ffO, \Q));
+ sigO.replace(sigO.extract(0, GetSize(dffQ)), dffQ);
+ }
// Loading value into output register is not
// supported unless using accumulator
- if (muxAB) {
+ if (mux) {
if (sigCD != sigO)
reject;
- if (muxA)
- sigCD = port(muxAB, \B);
- else if (muxB)
- sigCD = port(muxAB, \A);
- else log_abort();
+ sigCD = port(mux, muxAB == \B ? \A : \B);
+
+ cd_signed = add && param(add, \A_SIGNED).as_bool() && param(add, \B_SIGNED).as_bool();
+ } else if (dff && dff->hasPort(\SRST)) {
+ if (sigCD != sigO)
+ reject;
+ sigCD = param(dff, \SRST_VALUE);
+
+ cd_signed = add && param(add, \A_SIGNED).as_bool() && param(add, \B_SIGNED).as_bool();
+ }
+ }
+endcode
- cd_signed = addAB && param(addAB, \A_SIGNED).as_bool() && param(addAB, \B_SIGNED).as_bool();
+code argQ ffCD sigCD clock clock_pol
+ if (!sigCD.empty() && sigCD != sigO &&
+ (mul->type != \SB_MAC16 || (!param(mul, \C_REG).as_bool() && !param(mul, \D_REG).as_bool()))) {
+ argQ = sigCD;
+ subpattern(in_dffe);
+ if (dff) {
+ // Reset signal of C (IRSTTOP) and D (IRSTBOT)
+ // shared with A and B
+ if (ffA) {
+ if (ffA->hasPort(\ARST) != dff->hasPort(\ARST))
+ goto reject_ffCD;
+ if (ffA->hasPort(\ARST)) {
+ if (port(ffA, \ARST) != port(dff, \ARST))
+ goto reject_ffCD;
+ if (param(ffA, \ARST_POLARITY) != param(dff, \ARST_POLARITY))
+ goto reject_ffCD;
+ }
+ }
+ if (ffB) {
+ if (ffB->hasPort(\ARST) != dff->hasPort(\ARST))
+ goto reject_ffCD;
+ if (ffB->hasPort(\ARST)) {
+ if (port(ffB, \ARST) != port(dff, \ARST))
+ goto reject_ffCD;
+ if (param(ffB, \ARST_POLARITY) != param(dff, \ARST_POLARITY))
+ goto reject_ffCD;
+ }
+ }
+
+ ffCD = dff;
+ clock = dffclock;
+ clock_pol = dffclock_pol;
+ sigCD = dffD;
+
+reject_ffCD: ;
}
}
+endcode
+
+code sigCD
sigCD.extend_u0(32, cd_signed);
endcode
code
accept;
endcode
+
+// #######################
+
+subpattern in_dffe
+arg argD argQ clock clock_pol
+
+code
+ dff = nullptr;
+ if (argQ.empty())
+ reject;
+ for (auto c : argQ.chunks()) {
+ if (!c.wire)
+ reject;
+ if (c.wire->get_bool_attribute(\keep))
+ reject;
+ Const init = c.wire->attributes.at(\init, State::Sx);
+ if (!init.is_fully_undef() && !init.is_fully_zero())
+ reject;
+ }
+endcode
+
+match ff
+ select ff->type.in($dff, $dffe)
+ // DSP48E1 does not support clock inversion
+ select param(ff, \CLK_POLARITY).as_bool()
+
+ slice offset GetSize(port(ff, \D))
+ index <SigBit> port(ff, \Q)[offset] === argQ[0]
+
+ // Check that the rest of argQ is present
+ filter GetSize(port(ff, \Q)) >= offset + GetSize(argQ)
+ filter port(ff, \Q).extract(offset, GetSize(argQ)) == argQ
+endmatch
+
+code argQ argD
+{
+ if (clock != SigBit()) {
+ if (port(ff, \CLK) != clock)
+ reject;
+ if (param(ff, \CLK_POLARITY).as_bool() != clock_pol)
+ reject;
+ }
+
+ SigSpec Q = port(ff, \Q);
+ dff = ff;
+ dffclock = port(ff, \CLK);
+ dffclock_pol = param(ff, \CLK_POLARITY).as_bool();
+ dffD = argQ;
+ argD = port(ff, \D);
+ argQ = Q;
+ dffD.replace(argQ, argD);
+}
+endcode
+
+// #######################
+
+subpattern out_dffe
+arg argD argSdff argQ clock clock_pol
+
+code
+ dff = nullptr;
+ for (auto c : argD.chunks())
+ if (c.wire->get_bool_attribute(\keep))
+ reject;
+endcode
+
+match ff
+ select ff->type.in($dff, $dffe, $sdff, $sdffce)
+ // SB_MAC16 does not support clock inversion
+ select param(ff, \CLK_POLARITY).as_bool()
+
+ slice offset GetSize(port(ff, \D))
+ index <SigBit> port(ff, \D)[offset] === argD[0]
+
+ // Only allow sync reset if requested.
+ filter argSdff || ff->type.in($dff, $dffe)
+ // Check that the rest of argD is present
+ filter GetSize(port(ff, \D)) >= offset + GetSize(argD)
+ filter port(ff, \D).extract(offset, GetSize(argD)) == argD
+endmatch
+
+code argQ
+ if (ff) {
+ if (clock != SigBit()) {
+ if (port(ff, \CLK) != clock)
+ reject;
+ if (param(ff, \CLK_POLARITY).as_bool() != clock_pol)
+ reject;
+ }
+ SigSpec D = port(ff, \D);
+ SigSpec Q = port(ff, \Q);
+ argQ = argD;
+ argQ.replace(D, Q);
+
+ for (auto c : argQ.chunks()) {
+ Const init = c.wire->attributes.at(\init, State::Sx);
+ if (!init.is_fully_undef() && !init.is_fully_zero())
+ reject;
+ }
+
+ dff = ff;
+ dffQ = argQ;
+ dffclock = port(ff, \CLK);
+ dffclock_pol = param(ff, \CLK_POLARITY).as_bool();
+ }
+endcode
projects / yosys.git / blobdiff