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authorVincent Ambo <mail@tazj.in>2022-09-06T20·25+0300
committertazjin <tazjin@tvl.su>2022-09-11T12·26+0000
commite944c341a78fffe475ddbe866275737a21991dc5 (patch)
treed3fea8c448269e9e3d4e68e2b9eae4571e137bc3 /tvix/eval
parent627dfabef1dd3b640d07777de5535d074fb12f19 (diff)
docs(tvix/eval): add optimisation note on eliminating `with` thunks r/4803
Change-Id: I18d50ac8e157929a027f8bf284e65f1eb8950d5a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6488
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Diffstat (limited to 'tvix/eval')
-rw-r--r--tvix/eval/docs/known-optimisation-potential.md15
1 files changed, 9 insertions, 6 deletions
diff --git a/tvix/eval/docs/known-optimisation-potential.md b/tvix/eval/docs/known-optimisation-potential.md
index da9cf265ea5b..20884519cc44 100644
--- a/tvix/eval/docs/known-optimisation-potential.md
+++ b/tvix/eval/docs/known-optimisation-potential.md
@@ -50,12 +50,6 @@ optimisations, but note the most important ones here.
   can directly use the `value::function::Lambda` representation where
   possible.
 
-* Tail-call optimisation [hard]
-
-  We can statically detect the conditions for tail-call optimisation.
-  The compiler should do this, and it should then emit a new operation
-  for doing the tail-calls.
-
 * Optimise inner builtin access [medium]
 
   When accessing identifiers like `builtins.foo`, the compiler should
@@ -81,3 +75,12 @@ optimisations, but note the most important ones here.
   For details consult the commit with Gerrit change ID
   `I96828ab6a628136e0bac1bf03555faa4e6b74ece`, in which the initial
   attempt at doing this was reverted.
+
+* Avoid thunks if only identifier closing is required [medium]
+
+  Some constructs, like `with`, mostly do not change runtime behaviour
+  if thunked. However, they are wrapped in thunks to ensure that
+  deferred identifiers are resolved correctly.
+
+  This can be avoided, as we statically analyse the scope and should
+  be able to tell whether any such logic was required.