From c0063288d699f4f3edf5e0ff6ee1bd5cfa9ac884 Mon Sep 17 00:00:00 2001
From: Jannis Harder <me@jix.one>
Date: Thu, 21 Jul 2022 14:22:15 +0200
Subject: Add the $anyinit cell and the formalff pass

These can be used to protect undefined flip-flop initialization values
from optimizations that are not sound for formal verification and can
help mapping all solver-provided values in witness traces for flows that
use different backends simultaneously.
---
 kernel/celltypes.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'kernel/celltypes.h')

diff --git a/kernel/celltypes.h b/kernel/celltypes.h
index 7e9cfb38d..d62ba1506 100644
--- a/kernel/celltypes.h
+++ b/kernel/celltypes.h
@@ -51,6 +51,7 @@ struct CellTypes
 
 		setup_internals();
 		setup_internals_mem();
+		setup_internals_anyinit();
 		setup_stdcells();
 		setup_stdcells_mem();
 	}
@@ -155,6 +156,11 @@ struct CellTypes
 		setup_type(ID($dlatchsr), {ID::EN, ID::SET, ID::CLR, ID::D}, {ID::Q});
 	}
 
+	void setup_internals_anyinit()
+	{
+		setup_type(ID($anyinit), {ID::D}, {ID::Q});
+	}
+
 	void setup_internals_mem()
 	{
 		setup_internals_ff();
-- 
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