Add news

gvanrossum · Apr 3, 2024 · f38d922 · f38d922
1 parent dcee362
commit f38d922
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-04-03-13-44-04.gh-issue-116968.zgcdG2.rst b/Misc/NEWS.d/next/Core and Builtins/2024-04-03-13-44-04.gh-issue-116968.zgcdG2.rst
@@ -0,0 +1,11 @@
+Introduce a unified 16-bit backoff counter type (``_Py_BackoffCounter``),
+shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The
+API used for adaptive specialization counters is changed but the behavior is
+(supposed to be) identical.
+
+The behavior of the Tier 2 counters is changed:
+
+- There are no longer dynamic thresholds (we never varied these). - All
+counters now use the same exponential backoff. - The counter for
+``JUMP_BACKWARD`` starts counting down from 16. - The ``temperature`` in
+side exits starts counting down from 64.