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feat(formal): first DUT-bound property sets — fifo and mac prove under z3 - #2267

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Aug 19, 2026
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feat(formal): first DUT-bound property sets — fifo and mac prove under z3#2267
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Closes #2265. Refs #2266 #2239. First genuine formal verdicts in the repo's history (proven locally through the full smt chain before pushing); uart parked on the latch finding #2266; ci-gates §11 records the seven layers. docs/NOW.md updated.

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…e under z3

The old props modules never instantiated anything: assertions floated over
undriven mirrors of a port interface the generated modules never had, in
SVA yosys cannot parse. The v1 sets bind the real DUTs in the yosys subset
(immediate assertions) and are proven locally through the full chain (yosys
prep -> write_smt2 -> yosys-smtbmc -s z3): fifo Status PASSED, mac Status
PASSED -- the first genuine formal verdicts in the repo's history. uart's
set is written and cross-checked by exhaustive simulation (256/256 bytes),
but its .sby is parked as .blocked on #: the module carries an LDCE
with real combinational feedback (module-var writes in the comb lowering)
that no SMT model accepts. ci-gates gains section 11 (the seven formal
layers and the rules they distill).

Closes #2265.
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gHashTag enabled auto-merge (squash) August 19, 2026 23:37
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Generated at: 2026-08-19 23:37:53 UTC

Summary

Status Count
Total Open PRs 24
PRs with Failing Checks 9
PRs with All Checks Green 15
READY 7
FAILING 9
PENDING 0

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=375b2f88cc2f != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

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gHashTag merged commit 6e66067 into master Aug 19, 2026
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Formal layer 7 (final): props never instantiate the DUT, use unsupported SVA, and model a port interface the generated modules do not have

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