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ice40/pack: Add helper to constain cells that are unique in the FPGA

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Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2018-11-19 01:59:53 +01:00
parent 519d4e2af8
commit 271cc7be11
1 changed files with 16 additions and 0 deletions
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16
ice40/pack.cc
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@ -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)
{