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Fine tune ice40_dsp.pmg, add support for packing subsets of registers

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This commit is contained in:
Eddie Hung 2019-07-19 10:57:32 -07:00
parent 8f0e796be1
commit 9ad11ea2cc
4 changed files with 47 additions and 35 deletions
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7
passes/pmgen/ice40_dsp.cc
View file

@ -23,13 +23,16 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
template<class T> bool includes(const T &lhs, const T &rhs) {
return std::includes(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
}
#include "passes/pmgen/ice40_dsp_pm.h"
void create_ice40_dsp(ice40_dsp_pm &pm)
{
auto &st = pm.st_ice40_dsp;
#if 0
#if 1
log("\n");
log("ffA: %s\n", log_id(st.ffA, "--"));
log("ffB: %s\n", log_id(st.ffB, "--"));
@ -100,7 +103,7 @@ void create_ice40_dsp(ice40_dsp_pm &pm)
cell->setPort("\\IRSTTOP", State::S0);
cell->setPort("\\IRSTBOT", State::S0);
if (st.clock_vld)
if (st.clock != SigBit())
{
cell->setPort("\\CLK", st.clock);
cell->setPort("\\CE", State::S1);

53
passes/pmgen/ice40_dsp.pmg
View file

@ -1,8 +1,9 @@
pattern ice40_dsp
state <SigBit> clock
state <bool> clock_pol clock_vld
state <bool> clock_pol
state <SigSpec> sigA sigB sigY sigS
state <SigSpec> sigYused
state <Cell*> addAB muxAB
match mul
@ -13,68 +14,77 @@ endmatch
match ffA
select ffA->type.in($dff)
// select nusers(port(ffA, \Q)) == 2
index <SigSpec> port(ffA, \Q) === port(mul, \A)
filter !port(mul, \A).remove_const().empty()
filter includes(port(ffA, \Q).to_sigbit_set(), port(mul, \A).remove_const().to_sigbit_set())
optional
endmatch
code sigA clock clock_pol clock_vld
code sigA clock clock_pol
sigA = port(mul, \A);
if (ffA) {
sigA = port(ffA, \D);
sigA.replace(port(ffA, \Q), port(ffA, \D));
clock = port(ffA, \CLK).as_bit();
clock_pol = param(ffA, \CLK_POLARITY).as_bool();
clock_vld = true;
}
endcode
match ffB
select ffB->type.in($dff)
// select nusers(port(ffB, \Q)) == 2
index <SigSpec> port(ffB, \Q) === port(mul, \B)
filter !port(mul, \B).remove_const().empty()
filter includes(port(ffB, \Q).to_sigbit_set(), port(mul, \B).remove_const().to_sigbit_set())
optional
endmatch
code sigB clock clock_pol clock_vld
code sigB clock clock_pol
sigB = port(mul, \B);
if (ffB) {
sigB = port(ffB, \D);
sigB.replace(port(ffB, \Q), port(ffB, \D));
SigBit c = port(ffB, \CLK).as_bit();
bool cp = param(ffB, \CLK_POLARITY).as_bool();
if (clock_vld && (c != clock || cp != clock_pol))
if (clock != SigBit() && (c != clock || cp != clock_pol))
reject;
clock = c;
clock_pol = cp;
clock_vld = true;
}
endcode
// Extract the bits of Y that actually have a consumer
// (as opposed to being a sign extension)
code sigY sigYused
sigY = port(mul, \Y);
int i;
for (i = GetSize(sigY); i > 0; i--)
if (nusers(sigY[i-1]) > 1)
break;
sigYused = sigY.extract(0, i).remove_const();
endcode
match ffY
select ffY->type.in($dff)
select nusers(port(ffY, \D)) == 2
index <SigSpec> port(ffY, \D) === port(mul, \Y)
filter param(ffY, \WIDTH).as_int() >= GetSize(sigYused)
filter includes(port(ffY, \D).to_sigbit_set(), sigYused.to_sigbit_set())
optional
endmatch
code sigY clock clock_pol clock_vld
sigY = port(mul, \Y);
code clock clock_pol sigY
if (ffY) {
sigY = port(ffY, \Q);
sigY.replace(port(ffY, \D), port(ffY, \Q));
SigBit c = port(ffY, \CLK).as_bit();
bool cp = param(ffY, \CLK_POLARITY).as_bool();
if (clock_vld && (c != clock || cp != clock_pol))
if (clock != SigBit() && (c != clock || cp != clock_pol))
reject;
clock = c;
clock_pol = cp;
clock_vld = true;
}
endcode
@ -147,16 +157,15 @@ match ffS
index <SigSpec> port(ffS, \Q) === sigS
endmatch
code clock clock_pol clock_vld
code clock clock_pol
if (ffS) {
SigBit c = port(ffS, \CLK).as_bit();
bool cp = param(ffS, \CLK_POLARITY).as_bool();
if (clock_vld && (c != clock || cp != clock_pol))
if (clock != SigBit() && (c != clock || cp != clock_pol))
reject;
clock = c;
clock_pol = cp;
clock_vld = true;
}
endcode

2
passes/pmgen/xilinx_dsp.cc
View file

@ -39,7 +39,7 @@ void pack_xilinx_dsp(xilinx_dsp_pm &pm)
log("dsp: %s\n", log_id(st.dsp, "--"));
log("ffP: %s\n", log_id(st.ffP, "--"));
log("muxP: %s\n", log_id(st.muxP, "--"));
log("P_used: %s\n", log_signal(st.P_used));
log("sigPused: %s\n", log_signal(st.sigPused));
log_module(pm.module);
#endif

20
passes/pmgen/xilinx_dsp.pmg
View file

@ -1,7 +1,7 @@
pattern xilinx_dsp
state <SigBit> clock
state <SigSpec> P_used
state <SigSpec> sigPused
match dsp
select dsp->type.in(\DSP48E1)
@ -43,23 +43,23 @@ endcode
// Extract the bits of P that actually have a consumer
// (as opposed to being a sign extension)
code P_used
code sigPused
SigSpec P = port(dsp, \P);
int i;
for (i = GetSize(P); i > 0; i--)
if (nusers(P[i-1]) > 1)
break;
P_used = P.extract(0, i).remove_const();
sigPused = P.extract(0, i).remove_const();
endcode
match ffP
if !P_used.empty()
if !sigPused.empty()
select ffP->type.in($dff, $dffe)
select nusers(port(ffP, \D)) == 2
// DSP48E1 does not support clock inversion
select param(ffP, \CLK_POLARITY).as_bool()
filter param(ffP, \WIDTH).as_int() >= GetSize(P_used)
filter includes(port(ffP, \D).to_sigbit_set(), P_used.to_sigbit_set())
filter param(ffP, \WIDTH).as_int() >= GetSize(sigPused)
filter includes(port(ffP, \D).to_sigbit_set(), sigPused.to_sigbit_set())
optional
endmatch
@ -68,12 +68,12 @@ endmatch
// since that would lose information helpful for
// efficient wide-mux inference
match muxP
if !P_used.empty() && !ffP
if !sigPused.empty() && !ffP
select muxP->type.in($mux)
select nusers(port(muxP, \B)) == 2
select port(muxP, \A).is_fully_undef()
filter param(muxP, \WIDTH).as_int() >= GetSize(P_used)
filter includes(port(muxP, \B).to_sigbit_set(), P_used.to_sigbit_set())
filter param(muxP, \WIDTH).as_int() >= GetSize(sigPused)
filter includes(port(muxP, \B).to_sigbit_set(), sigPused.to_sigbit_set())
optional
endmatch
@ -83,7 +83,7 @@ match ffY
select nusers(port(ffY, \D)) == 2
// DSP48E1 does not support clock inversion
select param(ffY, \CLK_POLARITY).as_bool()
filter param(ffY, \WIDTH).as_int() >= GetSize(P_used)
filter param(ffY, \WIDTH).as_int() >= GetSize(sigPused)
filter includes(port(ffY, \D).to_sigbit_set(), port(muxP, \Y).to_sigbit_set())
endmatch