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router2: Some simple partitioning

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-11-19 10:42:43 +00:00
parent c21db8a0c1
commit 72f4721167
1 changed files with 44 additions and 0 deletions
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44
common/router2.cc
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@ -710,10 +710,54 @@ struct Router2
}
}
void partition_nets()
{
// Create a histogram of positions in X and Y positions
std::map<int, int> cxs, cys;
for (auto &n : nets) {
if (n.cx != -1)
++cxs[n.cx];
if (n.cy != -1)
++cys[n.cy];
}
// 4-way split for now
int accum_x = 0, accum_y = 0;
int mid_x = 0, mid_y = 0;
int halfway = int(nets.size()) / 2;
for (auto &p : cxs) {
if (accum_x < halfway && (accum_x + p.second) >= halfway)
mid_x = p.first;
accum_x += p.second;
}
for (auto &p : cys) {
if (accum_y < halfway && (accum_y + p.second) >= halfway)
mid_y = p.first;
accum_y += p.second;
}
log_info("x splitpoint: %d\n", mid_x);
log_info("y splitpoint: %d\n", mid_y);
std::vector<int> bins(5, 0);
for (auto &n : nets) {
if (n.bb.x0 < mid_x && n.bb.x1 < mid_x && n.bb.y0 < mid_y && n.bb.y1 < mid_y)
++bins[0]; // TL
else if (n.bb.x0 >= mid_x && n.bb.x1 >= mid_x && n.bb.y0 < mid_y && n.bb.y1 < mid_y)
++bins[1]; // TR
else if (n.bb.x0 < mid_x && n.bb.x1 < mid_x && n.bb.y0 >= mid_y && n.bb.y1 >= mid_y)
++bins[2]; // BL
else if (n.bb.x0 >= mid_x && n.bb.x1 >= mid_x && n.bb.y0 >= mid_y && n.bb.y1 >= mid_y)
++bins[3]; // BR
else
++bins[4]; // cross-boundary
}
for (int i = 0; i < 5; i++)
log_info("bin %d N=%d\n", i, bins[i]);
}
void router_test()
{
setup_nets();
setup_wires();
partition_nets();
curr_cong_weight = 0.5;
hist_cong_weight = 1.0;
ThreadContext st;