google / google/xls

[enhancement] Expose min_delay op in DSLX

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dslx enhancement
Dominant language
C++
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Description

### 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.

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