firrtl.md

FIRRTL

Constant propagation across module boundaries

FIRRTL will be able to check constant ports and propagate the const across module boundaries.

Here is an interesting remark about Rocket hartid:

Because deduplication is critical for hierarchical place and route. We can discuss changing the API for when deduplication does or does not occur but it seems prudent for this PR to preserve the status quo that is relied upon by users (in rocket-chip for example, see hartid which is an input to preserve deduplication)

[firrtl]