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-rw-r--r--tvix/eval/docs/known-optimisation-potential.md10
1 files changed, 10 insertions, 0 deletions
diff --git a/tvix/eval/docs/known-optimisation-potential.md b/tvix/eval/docs/known-optimisation-potential.md
index f45f1ee6c48a..e2e0497aeea1 100644
--- a/tvix/eval/docs/known-optimisation-potential.md
+++ b/tvix/eval/docs/known-optimisation-potential.md
@@ -128,3 +128,13 @@ optimisations, but note the most important ones here.
   very least [immutable data structures](https://docs.rs/im/latest/im/) that can
   be copied more efficiently than the stock structures we are using at the
   moment.
+
+* Skip finalising unfinalised thunks or non-thunks instead of crashing [easy]
+
+  Currently `OpFinalise` crashes the VM if it is called on values that don't
+  need to be finalised. This helps catching miscompilations where `OpFinalise`
+  operates on the wrong `StackIdx`. In the case of function argument patterns,
+  however, this means extra VM stack and instruction overhead for dynamically
+  determining if finalisation is necessary or not. This wouldn't be necessary
+  if `OpFinalise` would just noop on any values that don't need to be finalised
+  (anymore).