diff options
| author | David Shah <davey1576@gmail.com> | 2018-06-29 13:28:06 +0200 |
|---|---|---|
| committer | David Shah <davey1576@gmail.com> | 2018-06-29 13:28:06 +0200 |
| commit | 1aa4be770cf2162a617551bfbf76e371657cc8fe (patch) | |
| tree | 13df224e1ea836d2ae0935f576edb3c9aae80a82 /common | |
| parent | b5f473cd7a7412eb41e39cdf0b06dbcb6e4c137b (diff) | |
| download | nextpnr-1aa4be770cf2162a617551bfbf76e371657cc8fe.tar.gz nextpnr-1aa4be770cf2162a617551bfbf76e371657cc8fe.tar.bz2 nextpnr-1aa4be770cf2162a617551bfbf76e371657cc8fe.zip | |
Make single-cell placer less likely to get stuck
Signed-off-by: David Shah <davey1576@gmail.com>
Diffstat (limited to 'common')
| -rw-r--r-- | common/place_common.cc | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/common/place_common.cc b/common/place_common.cc index 12345a89..95faf67f 100644 --- a/common/place_common.cc +++ b/common/place_common.cc @@ -119,16 +119,16 @@ bool place_single_cell(Context *ctx, CellInfo *cell, bool require_legality) if (ctx->getBelType(bel) == targetType && (!require_legality || ctx->isValidBelForCell(cell, bel))) { if (ctx->checkBelAvail(bel)) { wirelen_t wirelen = get_cell_wirelength_at_bel(ctx, cell, bel); - if (wirelen == 0) - wirelen = ctx->rng(100); + if (iters >= 4) + wirelen += ctx->rng(25); if (wirelen <= best_wirelen) { best_wirelen = wirelen; best_bel = bel; } } else { wirelen_t wirelen = get_cell_wirelength_at_bel(ctx, cell, bel); - if (wirelen == 0) - wirelen = ctx->rng(100); + if (iters >= 4) + wirelen += ctx->rng(25); if (wirelen <= best_ripup_wirelen) { ripup_target = ctx->cells.at(ctx->getBoundBelCell(bel)).get(); if (ripup_target->belStrength < STRENGTH_STRONG) { |