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nexus: Tweak heuristics to improve routeability

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-11-18 10:54:52 +00:00
parent e3b3201d53
commit 76543d05e7
1 changed files with 2 additions and 2 deletions
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4
nexus/arch.cc
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@ -545,7 +545,7 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const
int dst_x = dst.tile % chip_info->width, dst_y = dst.tile / chip_info->width; int dst_x = dst.tile % chip_info->width, dst_y = dst.tile / chip_info->width;
int dist_x = std::abs(src_x - dst_x); int dist_x = std::abs(src_x - dst_x);
int dist_y = std::abs(src_y - dst_y); int dist_y = std::abs(src_y - dst_y);
return 100 * dist_x + 100 * dist_y + 250; return 75 * dist_x + 75 * dist_y + 200;
} }
delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
{ {
@ -608,7 +608,7 @@ bool Arch::place()
cfg.cellGroups.back().insert(id_OXIDE_COMB); cfg.cellGroups.back().insert(id_OXIDE_COMB);
cfg.cellGroups.back().insert(id_OXIDE_FF); cfg.cellGroups.back().insert(id_OXIDE_FF);
cfg.beta = 0.7; cfg.beta = 0.6;
cfg.criticalityExponent = 7; cfg.criticalityExponent = 7;
if (!placer_heap(getCtx(), cfg)) if (!placer_heap(getCtx(), cfg))
return false; return false;