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Support subtraction as well

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This commit is contained in:
Eddie Hung 2019-09-09 21:39:42 -07:00
parent 31e60353ac
commit 02cf9933b9
1 changed files with 114 additions and 103 deletions
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63
passes/pmgen/xilinx_dsp.cc
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@ -59,10 +59,11 @@ static Cell* addDsp(Module *module) {
void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
{
std::deque<Cell*> simd12, simd24;
std::deque<Cell*> simd12_add, simd12_sub;
std::deque<Cell*> simd24_add, simd24_sub;
for (auto cell : selected_cells) {
if (!cell->type.in("$add"))
if (!cell->type.in("$add", "$sub"))
continue;
SigSpec Y = cell->getPort("\\Y");
if (!Y.is_chunk())
@ -78,24 +79,26 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
continue;
if (GetSize(B) > 12)
continue;
simd12.push_back(cell);
if (cell->type == "$add")
simd12_add.push_back(cell);
else if (cell->type == "$sub")
simd12_sub.push_back(cell);
}
else if (GetSize(Y) <= 25) {
if (GetSize(A) > 24)
continue;
if (GetSize(B) > 24)
continue;
simd24.push_back(cell);
if (cell->type == "$add")
simd24_add.push_back(cell);
else if (cell->type == "$sub")
simd24_sub.push_back(cell);
}
else
log_abort();
}
SigSpec AB;
SigSpec C;
SigSpec P;
SigSpec CARRYOUT;
auto f12 = [&AB,&C,&P,&CARRYOUT,module](Cell *lane) {
auto f12 = [module](SigSpec &AB, SigSpec &C, SigSpec &P, SigSpec &CARRYOUT, Cell *lane) {
SigSpec A = lane->getPort("\\A");
SigSpec B = lane->getPort("\\B");
SigSpec Y = lane->getPort("\\Y");
@ -110,11 +113,9 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
P.append(Y.extract(0, 12));
CARRYOUT.append(Y[12]);
};
auto g12 = [&f12,module](std::deque<Cell*> &simd12) {
while (simd12.size() > 1) {
AB = SigSpec();
C = SigSpec();
P = SigSpec();
CARRYOUT = SigSpec();
SigSpec AB, C, P, CARRYOUT;
Cell *lane1 = simd12.front();
simd12.pop_front();
@ -143,12 +144,12 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
log_assert(lane1);
log_assert(lane2);
f12(lane1);
f12(lane2);
f12(AB, C, P, CARRYOUT, lane1);
f12(AB, C, P, CARRYOUT, lane2);
if (lane3) {
f12(lane3);
f12(AB, C, P, CARRYOUT, lane3);
if (lane4)
f12(lane4);
f12(AB, C, P, CARRYOUT, lane4);
else {
AB.append(Const(0, 12));
C.append(Const(0, 12));
@ -171,6 +172,8 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
cell->setPort("\\C", C);
cell->setPort("\\P", P);
cell->setPort("\\CARRYOUT", CARRYOUT);
if (lane1->type == "$sub")
cell->setPort("\\ALUMODE", Const::from_string("0011"));
module->remove(lane1);
module->remove(lane2);
@ -179,15 +182,17 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
module->design->select(module, cell);
}
};
g12(simd12_add);
g12(simd12_sub);
auto f24 = [&AB,&C,&P,&CARRYOUT,module](Cell *lane) {
auto f24 = [module](SigSpec &AB, SigSpec &C, SigSpec &P, SigSpec &CARRYOUT, Cell *lane) {
SigSpec A = lane->getPort("\\A");
SigSpec B = lane->getPort("\\B");
SigSpec Y = lane->getPort("\\Y");
A.extend_u0(24, lane->getParam("\\A_SIGNED").as_bool());
B.extend_u0(24, lane->getParam("\\B_SIGNED").as_bool());
AB.append(A);
C.append(B);
AB.append(B);
if (GetSize(Y) < 25)
Y.append(module->addWire(NEW_ID, 25-GetSize(Y)));
else
@ -196,11 +201,12 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
CARRYOUT.append(module->addWire(NEW_ID)); // TWO24 uses every other bit
CARRYOUT.append(Y[24]);
};
auto g24 = [&f24,module](std::deque<Cell*> &simd24) {
while (simd24.size() > 1) {
AB = SigSpec();
C = SigSpec();
P = SigSpec();
CARRYOUT = SigSpec();
SigSpec AB;
SigSpec C;
SigSpec P;
SigSpec CARRYOUT;
Cell *lane1 = simd24.front();
simd24.pop_front();
@ -218,8 +224,8 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
log_assert(lane1);
log_assert(lane2);
f24(lane1);
f24(lane2);
f24(AB, C, P, CARRYOUT, lane1);
f24(AB, C, P, CARRYOUT, lane2);
log_assert(GetSize(AB) == 48);
log_assert(GetSize(C) == 48);
log_assert(GetSize(P) == 48);
@ -229,12 +235,17 @@ void pack_xilinx_simd(Module *module, const std::vector<Cell*> &selected_cells)
cell->setPort("\\C", C);
cell->setPort("\\P", P);
cell->setPort("\\CARRYOUT", CARRYOUT);
if (lane1->type == "$sub")
cell->setPort("\\ALUMODE", Const::from_string("0011"));
module->remove(lane1);
module->remove(lane2);
module->design->select(module, cell);
}
};
g24(simd24_add);
g24(simd24_sub);
}