[enhancement] Expose min_delay op in DSLX

[hongted]

What's hard to do? (limit 100 words)

Currently IR supports the addition of a MIN_DELAY op to impose scheduling constraint between two nodes. This should be exposed to DSLX.

https://github.com/google/xls/blob/f231771f048112e74e23f9134a56606c16cdf634/xls/ir/ir_parser_test.cc#L886

Current best alternative workaround (limit 100 words)

Currently best alternative is the exposed scheduling constraint between send/recv channels.

Your view of the "best case XLS enhancement" (limit 100 words)

A min_delay op should be added to DSLX.

[hongted]

Related

https://github.com/google/xls/issues/911 https://github.com/google/xls/issues/899 https://github.com/google/xls/issues/1385 https://github.com/google/xls/issues/1386

[cdleary]

@hongted Are you proposing we introduce the first "cycle count" oriented construct into the DSL, or just that we make a way to sequence tokens with respect to other tokens independent of after_all?

[hongted]

For this, I'm proposing adding a "cycle count" oriented construct into the DSL. We already have it in the IR, and this issue would be to expose it.