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[interchange] Provide estimateDelay when USE_LOOKAHEAD is not defined.

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Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
This commit is contained in:
Keith Rothman 2021-04-02 16:23:29 -07:00
parent c43ad2fab6
commit ae2f7551c1
1 changed files with 16 additions and 1 deletions
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17
fpga_interchange/arch.cc
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@ -925,7 +925,22 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const
#ifdef USE_LOOKAHEAD
return lookahead.estimateDelay(getCtx(), src, dst);
#else
return 0;
// Note: Something is better than nothing when USE_LOOKAHEAD is not
// defined.
int src_tile = src.tile == -1 ? chip_info->nodes[src.index].tile_wires[0].tile : src.tile;
int dst_tile = dst.tile == -1 ? chip_info->nodes[dst.index].tile_wires[0].tile : dst.tile;
int src_x, src_y;
get_tile_x_y(src_tile, &src_x, &src_y);
int dst_x, dst_y;
get_tile_x_y(dst_tile, &dst_x, &dst_y);
delay_t base = 30 * std::min(std::abs(dst_x - src_x), 18) + 10 * std::max(std::abs(dst_x - src_x) - 18, 0) +
60 * std::min(std::abs(dst_y - src_y), 6) + 20 * std::max(std::abs(dst_y - src_y) - 6, 0) + 300;
base = (base * 3) / 2;
return base;
#endif
}