diff options
Diffstat (limited to 'fpga_interchange/luts.h')
| -rw-r--r-- | fpga_interchange/luts.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/fpga_interchange/luts.h b/fpga_interchange/luts.h index 5a46b3ed..980fe530 100644 --- a/fpga_interchange/luts.h +++ b/fpga_interchange/luts.h @@ -27,6 +27,7 @@ #include "nextpnr_namespaces.h" #include "dynamic_bitarray.h" +#include "hash_table.h" NEXTPNR_NAMESPACE_BEGIN @@ -91,9 +92,20 @@ struct LutMapper std::vector<CellInfo *> cells; - bool remap_luts(const Context *ctx); + bool remap_luts(const Context *ctx, HashTables::HashSet<const LutBel *> *blocked_luts); + + // Determine which wires given the current mapping must be tied to the + // default constant. + // + // Returns a bit mask, 1 meaning it must be tied. Otherwise means that + // the pin is free to be a signal. uint32_t check_wires(const std::vector<std::vector<int32_t>> &bel_to_cell_pin_remaps, - const std::vector<const LutBel *> &lut_bels, uint32_t used_pins) const; + const std::vector<const LutBel *> &lut_bels, uint32_t used_pins, + HashTables::HashSet<const LutBel *> *blocked_luts) const; + + // Version of check_wires that uses current state of cells based on pin + // mapping in cells variable. + uint32_t check_wires(const Context *ctx) const; }; // Rotate and merge a LUT equation into an array of levels. |