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| author | David Shah <davey1576@gmail.com> | 2018-06-20 17:54:07 +0200 |
|---|---|---|
| committer | David Shah <davey1576@gmail.com> | 2018-06-20 17:54:07 +0200 |
| commit | c515e5da2df1003addc02ffa606f5bda1cf1f475 (patch) | |
| tree | 7e87a43b53976e193246b9e7f21d24dbbcefc032 /common/place_sa.cc | |
| parent | 4fc962504028f581cc1db9ada5770900d8dacae2 (diff) | |
| download | nextpnr-c515e5da2df1003addc02ffa606f5bda1cf1f475.tar.gz nextpnr-c515e5da2df1003addc02ffa606f5bda1cf1f475.tar.bz2 nextpnr-c515e5da2df1003addc02ffa606f5bda1cf1f475.zip | |
Improving placement timing heuristic
Signed-off-by: David Shah <davey1576@gmail.com>
Diffstat (limited to 'common/place_sa.cc')
| -rw-r--r-- | common/place_sa.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/common/place_sa.cc b/common/place_sa.cc index 485ddc88..2b8b960b 100644 --- a/common/place_sa.cc +++ b/common/place_sa.cc @@ -315,7 +315,10 @@ class SAPlacer // wirelength += std::abs(load_x - driver_x) + std::abs(load_y - // driver_y); delay_t raw_wl = ctx->estimateDelay(drv_wire, user_wire); - wirelength += 100 * (ctx->getDelayNS(raw_wl) / ctx->getDelayNS(load.budget)); + wirelength += pow(1.3, (ctx->getDelayNS(raw_wl) - + ctx->getDelayNS(load.budget)) / + 10) + + ctx->getDelayNS(raw_wl); // wirelength += pow(ctx->estimateDelay(drv_wire, user_wire), 2.0); } return wirelength; |