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Pack adders not just accumulators

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This commit is contained in:
Eddie Hung 2019-07-22 13:01:49 -07:00
parent 3a7aeb028d
commit 5a14b6e1f6
2 changed files with 33 additions and 16 deletions
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38
passes/pmgen/ice40_dsp.cc
View file

@ -80,17 +80,25 @@ void create_ice40_dsp(ice40_dsp_pm &pm)
SigSpec B = st.sigB;
B.extend_u0(16, b_signed);
// MAC only if ffS exists and adder's other input (sigS)
// is output of ffS
bool accum = (st.ffS && st.sigS == st.ffS->getPort("\\Q"));
SigSpec CD;
if (st.muxA)
CD = st.muxA->getPort("\\B");
if (st.muxB)
CD = st.muxB->getPort("\\A");
if (st.ffS) {
if (st.muxA)
CD = st.muxA->getPort("\\B");
else if (st.muxB)
CD = st.muxB->getPort("\\A");
}
else if (!accum)
CD = st.sigS.extend_u0(32, st.sigS_signed);
CD.extend_u0(32, a_signed && b_signed);
cell->setPort("\\A", A);
cell->setPort("\\B", B);
cell->setPort("\\C", CD.extract(0, 16));
cell->setPort("\\D", CD.extract(16, 16));
cell->setPort("\\C", CD.extract(16, 16));
cell->setPort("\\D", CD.extract(0, 16));
cell->setParam("\\A_REG", st.ffA ? State::S1 : State::S0);
cell->setParam("\\B_REG", st.ffB ? State::S1 : State::S0);
@ -145,14 +153,19 @@ void create_ice40_dsp(ice40_dsp_pm &pm)
// SB_MAC16 Output Interface
SigSpec O = st.ffS ? st.sigS : st.sigY;
if (st.addAB) log_cell(st.addAB);
SigSpec O = st.ffS ? st.sigS : (st.addAB ? st.addAB->getPort("\\Y") : st.sigY);
if (GetSize(O) < 32)
O.append(pm.module->addWire(NEW_ID, 32-GetSize(O)));
cell->setPort("\\O", O);
if (st.addAB) {
log(" accumulator %s (%s)\n", log_id(st.addAB), log_id(st.addAB->type));
log_warning("sigS = %s\n", log_signal(st.sigS));
if (accum)
log(" accumulator %s (%s)\n", log_id(st.addAB), log_id(st.addAB->type));
else
log(" adder %s (%s)\n", log_id(st.addAB), log_id(st.addAB->type));
cell->setPort("\\ADDSUBTOP", st.addAB->type == "$add" ? State::S0 : State::S1);
cell->setPort("\\ADDSUBBOT", st.addAB->type == "$add" ? State::S0 : State::S1);
} else {
@ -185,14 +198,14 @@ void create_ice40_dsp(ice40_dsp_pm &pm)
cell->setParam("\\PIPELINE_16x16_MULT_REG1", st.ffY ? State::S1 : State::S0);
cell->setParam("\\PIPELINE_16x16_MULT_REG2", State::S0);
cell->setParam("\\TOPOUTPUT_SELECT", Const(st.ffS ? 1 : 3, 2));
cell->setParam("\\TOPOUTPUT_SELECT", Const(st.ffS ? 1 : (st.addAB ? 0 : 3), 2));
cell->setParam("\\TOPADDSUB_LOWERINPUT", Const(2, 2));
cell->setParam("\\TOPADDSUB_UPPERINPUT", State::S0);
cell->setParam("\\TOPADDSUB_UPPERINPUT", st.ffS ? State::S0 : State::S1);
cell->setParam("\\TOPADDSUB_CARRYSELECT", Const(3, 2));
cell->setParam("\\BOTOUTPUT_SELECT", Const(st.ffS ? 1 : 3, 2));
cell->setParam("\\BOTOUTPUT_SELECT", Const(st.ffS ? 1 : (st.addAB ? 0 : 3), 2));
cell->setParam("\\BOTADDSUB_LOWERINPUT", Const(2, 2));
cell->setParam("\\BOTADDSUB_UPPERINPUT", State::S0);
cell->setParam("\\BOTADDSUB_UPPERINPUT", st.ffS ? State::S0 : State::S1);
cell->setParam("\\BOTADDSUB_CARRYSELECT", Const(0, 2));
cell->setParam("\\MODE_8x8", State::S0);
@ -201,6 +214,7 @@ void create_ice40_dsp(ice40_dsp_pm &pm)
pm.autoremove(st.mul);
pm.autoremove(st.ffY);
pm.autoremove(st.addAB);
pm.autoremove(st.ffS);
}

11
passes/pmgen/ice40_dsp.pmg
View file

@ -1,7 +1,7 @@
pattern ice40_dsp
state <SigBit> clock
state <bool> clock_pol
state <bool> clock_pol sigS_signed
state <SigSpec> sigA sigB sigY sigS
state <Cell*> addAB muxAB
@ -92,14 +92,16 @@ match addB
optional
endmatch
code addAB sigS
code addAB sigS sigS_signed
if (addA) {
addAB = addA;
sigS = port(addA, \B);
sigS = port(addAB, \B);
sigS_signed = param(addAB, \B_SIGNED).as_bool();
}
if (addB) {
addAB = addB;
sigS = port(addB, \A);
sigS = port(addAB, \A);
sigS_signed = param(addAB, \A_SIGNED).as_bool();
}
if (addAB) {
int natural_mul_width = GetSize(sigA) + GetSize(sigB);
@ -144,6 +146,7 @@ match ffS
select nusers(port(ffS, \D)) == 2
index <SigSpec> port(ffS, \D) === port(muxAB, \Y)
index <SigSpec> port(ffS, \Q) === sigS
optional
endmatch
code clock clock_pol