From 8371c0dd09e5b59189a391fb1b867e5249442046 Mon Sep 17 00:00:00 2001 From: Eddie Hung Date: Mon, 30 Jul 2018 18:55:22 -0700 Subject: Speedup worst_slack computation --- common/place_common.cc | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'common') diff --git a/common/place_common.cc b/common/place_common.cc index 5673c847..9fba90f9 100644 --- a/common/place_common.cc +++ b/common/place_common.cc @@ -40,7 +40,7 @@ wirelen_t get_net_metric(const Context *ctx, const NetInfo *net, MetricType type WireId drv_wire = ctx->getBelPinWire(driver_cell->bel, ctx->portPinFromId(net->driver.port)); if (driver_gb) return 0; - float worst_slack = 1000; + delay_t worst_slack = std::numeric_limits::max(); int xmin = driver_loc.x, xmax = driver_loc.x, ymin = driver_loc.y, ymax = driver_loc.y; for (auto load : net->users) { if (load.cell == nullptr) @@ -51,7 +51,7 @@ wirelen_t get_net_metric(const Context *ctx, const NetInfo *net, MetricType type if (ctx->timing_driven && type == MetricType::COST) { WireId user_wire = ctx->getBelPinWire(load_cell->bel, ctx->portPinFromId(load.port)); delay_t raw_wl = ctx->estimateDelay(drv_wire, user_wire); - float slack = ctx->getDelayNS(load.budget) - ctx->getDelayNS(raw_wl); + auto slack = load.budget - raw_wl; if (slack < 0) tns += slack; worst_slack = std::min(slack, worst_slack); @@ -67,7 +67,7 @@ wirelen_t get_net_metric(const Context *ctx, const NetInfo *net, MetricType type ymax = std::max(ymax, load_loc.y); } if (ctx->timing_driven && type == MetricType::COST) { - wirelength = wirelen_t((((ymax - ymin) + (xmax - xmin)) * std::min(5.0, (1.0 + std::exp(-worst_slack / 5))))); + wirelength = wirelen_t((((ymax - ymin) + (xmax - xmin)) * std::min(5.0, (1.0 + std::exp(-ctx->getDelayNS(worst_slack) / 5))))); } else { wirelength = wirelen_t((ymax - ymin) + (xmax - xmin)); } -- cgit v1.2.3