[circt-synth] Partially lower Comb operations and run canonicalizations #8218
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uenoku
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Previously CombToAIG lowers every comb operations into AIG operations in a single pass. The issue is the size of IR lowered from Comb is very large, and it heavily relies on AIG canonicalizations clean up. This is some times very inefficient, and it's much better to clean up at Comb level. So this commits adds another run of CombToAIG that paratially lowers Comb operations, specifically arithmetic operations (add, sub, mul, shift etc).
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Previously CombToAIG lowers every comb operations into AIG operations
in a single pass. The issue is the size of IR lowered from Comb is
very large, and it heavily relies on AIG canonicalizations clean up.
This is some times very inefficient, and it's much better to clean up
at Comb level.
So this commits adds another run of CombToAIG that paratially lowers
Comb operations, specifically arithmetic operations (add, sub, mul, shift etc).