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gowin: Place DFFs of different types in the slice.

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Allow the registers of the same type or pairs shown below to be
placed in the same slide:

|--------|--------|
| DFFS   | DFFR   |
| DFFSE  | DFFRE  |
| DFFP   | DFFC   |
| DFFPE  | DFFCE  |
| DFFNS  | DFFNR  |
| DFFNSE | DFFNRE |
| DFFNP  | DFFNC  |
| DFFNPE | DFFNCE |

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
This commit is contained in:
YRabbit 2021-08-31 07:53:15 +10:00
parent 23a5e91858
commit f3899696a7
1 changed files with 26 additions and 2 deletions
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28
gowin/arch.cc
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@ -804,6 +804,27 @@ Arch::Arch(ArchArgs args) : args(args)
}
}
}
// Permissible combinations of modes in a single slice
dff_comp_mode[id_DFF] = id_DFF;
dff_comp_mode[id_DFFE] = id_DFFE;
dff_comp_mode[id_DFFS] = id_DFFR;
dff_comp_mode[id_DFFR] = id_DFFS;
dff_comp_mode[id_DFFSE] = id_DFFRE;
dff_comp_mode[id_DFFRE] = id_DFFSE;
dff_comp_mode[id_DFFP] = id_DFFC;
dff_comp_mode[id_DFFC] = id_DFFP;
dff_comp_mode[id_DFFPE] = id_DFFCE;
dff_comp_mode[id_DFFCE] = id_DFFPE;
dff_comp_mode[id_DFFNS] = id_DFFNR;
dff_comp_mode[id_DFFNR] = id_DFFNS;
dff_comp_mode[id_DFFNSE] = id_DFFNRE;
dff_comp_mode[id_DFFNRE] = id_DFFNSE;
dff_comp_mode[id_DFFNP] = id_DFFNC;
dff_comp_mode[id_DFFNC] = id_DFFNP;
dff_comp_mode[id_DFFNPE] = id_DFFNCE;
dff_comp_mode[id_DFFNCE] = id_DFFNPE;
BaseArch::init_cell_types();
BaseArch::init_bel_buckets();
}
@ -1251,8 +1272,11 @@ bool Arch::cellsCompatible(const CellInfo **cells, int count) const
return false;
if (mode[cls] == IdString())
mode[cls] = ci->ff_type;
else if (mode[cls] != ci->ff_type)
return false;
else if (mode[cls] != ci->ff_type) {
auto res = dff_comp_mode.find(mode[cls]);
if (res == dff_comp_mode.end() || res->second != ci->ff_type)
return false;
}
}
}
return true;