add docs

Author: iritkatriel

Doc/library/dis.rst

@@ -1721,6 +1721,13 @@ iterations of the loop.
       Previously, this instruction also pushed a boolean value indicating
       success (``True``) or failure (``False``).
 
+.. opcode:: CHECK_PERIODIC
+
+   Detects and handles certain conditions of interpreter state, such as
+   signals and async exceptions. This bytecode is emitted alongside calls
+   and backward jumps to ensure that it appears in any long execution path.
+
+   .. versionadded:: 3.14
 
 .. opcode:: RESUME (context)
 

Doc/whatsnew/3.14.rst

@@ -1696,6 +1696,9 @@ CPython Bytecode Changes
 * Replaced the opcode ``BINARY_SUBSCR`` by :opcode:`BINARY_OP` with oparg ``NB_SUBSCR``.
   (Contributed by Irit Katriel in :gh:`100239`.)
 
+* Added opcode ``CHECK_PERIODIC`` which detects and handles signals, async exceptions,
+  etc. (Contributed by Irit Katriel in :gh:`132532`.)
+
 Porting to Python 3.14
 ======================
 

Misc/NEWS.d/next/Core_and_Builtins/2025-04-15-12-58-44.gh-issue-132532.TDwWhv.rst

@@ -0,0 +1 @@
+Add :opcode:`CHECK_PERIODIC` for signal checks, etc.