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Cannot pack MUXF8 with new yosys master+wip #1425

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acomodi opened this issue Apr 16, 2020 · 0 comments
Open

Cannot pack MUXF8 with new yosys master+wip #1425

acomodi opened this issue Apr 16, 2020 · 0 comments

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@acomodi
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acomodi commented Apr 16, 2020

With a local master+wip version updated to the latest upstream master, there is a packing issue related to the MUXF8 primitive.

Failed route at end, repack cluster trying detailed routing at each stage.
Complex block 1904: '$abc$314123$auto$dff2dffe.cc:175:make_patterns_logic$54569' (BLK-TL-SLICEL) .Net '$abc$314123$auto$dff2dffe.cc:175:make_patterns_logic$54569' is impossible to route within proposed BLK-TL-SLICEL cluster
.Net '$abc$314123$auto$dff2dffe.cc:175:make_patterns_logic$54569' is impossible to route within proposed BLK-TL-SLICEL cluster
.Net '$abc$314123$auto$dff2dffe.cc:175:make_patterns_logic$54569' is impossible to route within proposed BLK-TL-SLICEL cluster
.Error 1:
Type: Packing
File: /data/vtr-symbiflow/vpr/src/pack/cluster.cpp
Line: 2048
Message: Can not find any logic block that can implement molecule.
        Atom $abc$314123$lut$aiger314122$40697.mux8 (MUXF8)

To temporary solve the problem the -nowidelut parameter had to be added to the synthesys script.

We want eventually to re-enable the wide lut inference to be able to use MUXF78.
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