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Take preferred CSC

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This commit is contained in:
Miodrag Milanovic 2024-08-22 08:49:32 +02:00
parent 6593101d8c
commit a22ace5e18
1 changed files with 20 additions and 16 deletions
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36
himbaechel/uarch/ng-ultra/pack.cc
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@ -2458,33 +2458,33 @@ void NgUltraImpl::postPlace()
ctx->assignArchInfo();
}
BelId getCSC(Context *ctx, Loc l) {
BelId getCSC(Context *ctx, Loc l, int row) {
BelId bel = ctx->getBelByLocation(Loc(l.x+1,l.y+2,0));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==1)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+1,l.y+2,15));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==2)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+1,l.y+2,16));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==3)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+1,l.y+2,31));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==4)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+2,l.y+3,0));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==1)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+2,l.y+3,15));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==2)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+2,l.y+3,16));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==3)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+2,l.y+3,31));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==4)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+3,l.y+2,0));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==1)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+3,l.y+2,15));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==2)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+3,l.y+2,16));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==3)) return bel;
bel = ctx->getBelByLocation(Loc(l.x+3,l.y+2,31));
if (!ctx->getBoundBelCell(bel)) return bel;
if (!ctx->getBoundBelCell(bel) && (row==0 || row==4)) return bel;
return BelId();
}
@ -2514,12 +2514,13 @@ void NgUltraPacker::insert_csc()
for (std::size_t i = 0; i < std::min<std::size_t>(fanout.size(),available_csc ); i++) {
auto &n = fanout.at(i);
if (lsm.second[n.second].size() < 4) break;
BelId newbel = getCSC(ctx,loc);
if (newbel==BelId()) break;
NetInfo *net = ctx->nets.at(n.second).get();
CellInfo *cell = net->driver.cell;
if (uarch->tile_name(cell->bel.tile) == lsm.first.c_str(ctx) && !cell->params.count(id_dff_used) && cell->cluster == ClusterId()) {
BelId newbel = getCSC(ctx,loc,0);
if (newbel==BelId()) break;
ctx->unbindBel(cell->bel);
cell->disconnectPort(id_LO);
NetInfo *new_out = ctx->createNet(ctx->id(cell->name.str(ctx) + "$o"));
@ -2534,7 +2535,10 @@ void NgUltraPacker::insert_csc()
change_to_csc++;
continue;
}
Loc cell_loc = ctx->getBelLocation(cell->bel);
BelId newbel = getCSC(ctx,loc,(cell_loc.y & 3)+1); // Take CSC from pefered row
if (newbel==BelId()) newbel = getCSC(ctx,loc,0); // Try getting any other CSC
if (newbel==BelId()) break;
CellInfo *fe = create_cell_ptr(id_BEYOND_FE, ctx->id(net->name.str(ctx) + "$" + lsm.first.c_str(ctx) + "$csc"));
NetInfo *new_out = ctx->createNet(ctx->id(fe->name.str(ctx) + "$o"));