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| author | Sylvain Munaut <tnt@246tNt.com> | 2018-11-19 01:59:53 +0100 |
|---|---|---|
| committer | Sylvain Munaut <tnt@246tNt.com> | 2018-11-19 18:20:20 +0100 |
| commit | 271cc7be115fc28ffe82a1bade235e41a3b43896 (patch) | |
| tree | c4237118666a155c9a084f9b5d2a603292dd7be9 /ice40 | |
| parent | 519d4e2af8d8e7d8e2d1d873b9cd9681ef83cc62 (diff) | |
| download | nextpnr-271cc7be115fc28ffe82a1bade235e41a3b43896.tar.gz nextpnr-271cc7be115fc28ffe82a1bade235e41a3b43896.tar.bz2 nextpnr-271cc7be115fc28ffe82a1bade235e41a3b43896.zip | |
ice40/pack: Add helper to constain cells that are unique in the FPGA
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Diffstat (limited to 'ice40')
| -rw-r--r-- | ice40/pack.cc | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/ice40/pack.cc b/ice40/pack.cc index a40f0878..255dc75f 100644 --- a/ice40/pack.cc +++ b/ice40/pack.cc @@ -695,6 +695,22 @@ static std::unique_ptr<CellInfo> spliceLUT(Context *ctx, CellInfo *ci, IdString return pt; } +// Force placement for cells that are unique anyway +static BelId cell_place_unique(Context *ctx, CellInfo *ci) +{ + for (auto bel : ctx->getBels()) { + if (ctx->getBelType(bel) != ci->type) + continue; + if (ctx->isBelLocked(bel)) + continue; + IdString bel_name = ctx->getBelName(bel); + ci->attrs[ctx->id("BEL")] = bel_name.str(ctx); + log_info(" constrained %s '%s' to %s\n", ci->type.c_str(ctx), ci->name.c_str(ctx), bel_name.c_str(ctx)); + return bel; + } + log_error("Unable to place cell '%s' of type '%s'\n", ci->name.c_str(ctx), ci->type.c_str(ctx)); +} + // Pack special functions static void pack_special(Context *ctx) { |