[codegen 1.5] Decouple channel ready/valid handshakes - #4818
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For each receive, we decouple the ready signal from that receive's own input valid signal, driving it instead by `inputs_valid & (all other active inputs are valid) & outputs_ready & active_outputs_ready`. This requires generating all-except-one conjunctions for the receive-valid conditions in each stage, which we do efficiently using a Brent-Kung-style parallel prefix/suffix construction. PiperOrigin-RevId: 966078768
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[codegen 1.5] Decouple channel ready/valid handshakes
For each receive, we decouple the ready signal from that receive's own input valid signal, driving it instead by
inputs_valid & (all other active inputs are valid) & outputs_ready & active_outputs_ready. This requires generating all-except-one conjunctions for the receive-valid conditions in each stage, which we do efficiently using a Brent-Kung-style parallel prefix/suffix construction.