caiyu/nextpnr
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

nexus: Tweak delay heuristics

Browse Source 
Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-11-12 11:48:21 +00:00
parent a69c595802
commit c7ad3cece6
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
nexus/arch.cc
View File

@ -545,19 +545,21 @@ 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; return 100 * dist_x + 100 * dist_y + 250;
} }
delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
{ {
if (net_info->driver.cell == nullptr || net_info->driver.cell->bel == BelId() || sink.cell->bel == BelId()) if (net_info->driver.cell == nullptr || net_info->driver.cell->bel == BelId() || sink.cell->bel == BelId())
return 0; return 0;
if (sink.port == id_FCI)
return 0;
int src_x = net_info->driver.cell->bel.tile % chip_info->width, int src_x = net_info->driver.cell->bel.tile % chip_info->width,
src_y = net_info->driver.cell->bel.tile / chip_info->width; src_y = net_info->driver.cell->bel.tile / chip_info->width;
int dst_x = sink.cell->bel.tile % chip_info->width, dst_y = sink.cell->bel.tile / chip_info->width; int dst_x = sink.cell->bel.tile % chip_info->width, dst_y = sink.cell->bel.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; return 100 * dist_x + 100 * dist_y + 250;
} }
bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const { return false; } bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const { return false; }