caiyu/nextpnr
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

HeAP: Make solver tolerance arch-configurable

Browse Source 
Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-02-02 15:28:11 +00:00
parent 7bda6f15a9
commit 1ff060c5ad
2 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
common/placer_heap.cc
View File

@ -97,7 +97,7 @@ template <typename T> struct EquationSystem
void add_rhs(int row, T val) { rhs[row] += val; }
void solve(std::vector<T> &x)
void solve(std::vector<T> &x, float tolerance)
{
using namespace Eigen;
if (x.empty())
@ -123,7 +123,7 @@ template <typename T> struct EquationSystem
vb[i] = rhs.at(i);
ConjugateGradient<SparseMatrix<T>, Lower | Upper> solver;
solver.setTolerance(1e-5);
solver.setTolerance(tolerance);
VectorXd xr = solver.compute(mat).solveWithGuess(vb, vx);
for (int i = 0; i < int(x.size()); i++)
x.at(i) = xr[i];
@ -712,7 +712,7 @@ class HeAPPlacer
auto cell_pos = [&](CellInfo *cell) { return yaxis ? cell_locs.at(cell->name).y : cell_locs.at(cell->name).x; };
std::vector<double> vals;
std::transform(solve_cells.begin(), solve_cells.end(), std::back_inserter(vals), cell_pos);
es.solve(vals);
es.solve(vals, cfg.solverTolerance);
for (size_t i = 0; i < vals.size(); i++)
if (yaxis) {
cell_locs.at(solve_cells.at(i)->name).rawy = vals.at(i);
@ -1610,6 +1610,7 @@ PlacerHeapCfg::PlacerHeapCfg(Context *ctx)
criticalityExponent = ctx->setting<int>("placerHeap/criticalityExponent", 2);
timingWeight = ctx->setting<int>("placerHeap/timingWeight", 10);
timing_driven = ctx->setting<bool>("timing_driven");
solverTolerance = 1e-5;
}
NEXTPNR_NAMESPACE_END

1
common/placer_heap.h
View File

@ -39,6 +39,7 @@ struct PlacerHeapCfg
float criticalityExponent;
float timingWeight;
bool timing_driven;
float solverTolerance;
std::unordered_set<IdString> ioBufTypes;
};