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Make single-cell placer less likely to get stuck

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-06-29 13:28:06 +02:00
parent b5f473cd7a
commit 1aa4be770c
1 changed files with 4 additions and 4 deletions
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8
common/place_common.cc
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@ -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) {