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| author | David Shah <davey1576@gmail.com> | 2018-12-09 14:41:02 +0000 |
|---|---|---|
| committer | David Shah <dave@ds0.me> | 2019-03-22 10:31:54 +0000 |
| commit | 222abb5be29a95538f37ed28760df68b037b2a52 (patch) | |
| tree | b763b528381b2dd90be180bdf6222022607ce436 | |
| parent | c926b273ded6e6d805ae66d1f9c5be8a85156ca8 (diff) | |
| download | nextpnr-222abb5be29a95538f37ed28760df68b037b2a52.tar.gz nextpnr-222abb5be29a95538f37ed28760df68b037b2a52.tar.bz2 nextpnr-222abb5be29a95538f37ed28760df68b037b2a52.zip | |
placer1: Encourage chain swaps
Signed-off-by: David Shah <davey1576@gmail.com>
| -rw-r--r-- | common/placer1.cc | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/common/placer1.cc b/common/placer1.cc index db10b7d3..ecb61b5c 100644 --- a/common/placer1.cc +++ b/common/placer1.cc @@ -553,7 +553,7 @@ class SAPlacer (1 - lambda) * (double(moveChange.wirelen_delta) / last_wirelen_cost); n_move++; // SA acceptance criterea - if (delta < 0 || (temp > 1e-8 && (ctx->rng() / float(0x3fffffff)) <= std::exp(-delta / temp))) { + if (delta < 0 || (temp > 1e-9 && (ctx->rng() / float(0x3fffffff)) <= std::exp(-delta / (5 * temp)))) { n_accept++; if (ctx->debug) log_info("accepted chain swap %s\n", cell->name.c_str(ctx)); |