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gh-95913: edit description of opcodes changes #98566

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26 changes: 10 additions & 16 deletions Doc/whatsnew/3.11.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1493,35 +1493,29 @@ CPython bytecode changes
indicate failure with :const:`None` (where a tuple of extracted values would
otherwise be).

* Replace several stack manipulation instructions (``DUP_TOP``, ``DUP_TOP_TWO``,
* Replaced several stack manipulation instructions (``DUP_TOP``, ``DUP_TOP_TWO``,
``ROT_TWO``, ``ROT_THREE``, ``ROT_FOUR``, and ``ROT_N``) with new
:opcode:`COPY` and :opcode:`SWAP` instructions.

* Replaced :opcode:`JUMP_IF_NOT_EXC_MATCH` by :opcode:`CHECK_EXC_MATCH` which
performs the check but does not jump.

* Replaced :opcode:`JUMP_IF_NOT_EG_MATCH` by :opcode:`CHECK_EG_MATCH` which
performs the check but does not jump.
* Replaced :opcode:`JUMP_IF_NOT_EXC_MATCH` and :opcode:`JUMP_IF_NOT_EG_MATCH`
by :opcode:`CHECK_EXC_MATCH` and :opcode:`JUMP_IF_NOT_EG_MATCH` which
perform the check but do not jump.

* Replaced :opcode:`JUMP_ABSOLUTE` by the relative :opcode:`JUMP_BACKWARD`.

* Added :opcode:`JUMP_BACKWARD_NO_INTERRUPT`, which is used in certain loops where it
is undesirable to handle interrupts.

* Replaced :opcode:`POP_JUMP_IF_TRUE` and :opcode:`POP_JUMP_IF_FALSE` by
the relative :opcode:`POP_JUMP_FORWARD_IF_TRUE`, :opcode:`POP_JUMP_BACKWARD_IF_TRUE`,
:opcode:`POP_JUMP_FORWARD_IF_FALSE` and :opcode:`POP_JUMP_BACKWARD_IF_FALSE`.

* Added :opcode:`POP_JUMP_FORWARD_IF_NOT_NONE`, :opcode:`POP_JUMP_BACKWARD_IF_NOT_NONE`,
:opcode:`POP_JUMP_FORWARD_IF_NONE` and :opcode:`POP_JUMP_BACKWARD_IF_NONE`
opcodes to speed up conditional jumps.

* :opcode:`JUMP_IF_TRUE_OR_POP` and :opcode:`JUMP_IF_FALSE_OR_POP` are now
relative rather than absolute.
* All jump opcodes are now relative: the arg is an offset from the current
instruction rather than an absolute location to jump to, and the op name
typically includes the direction of the jump (FORWARD/BACKWARD).

* :opcode:`RESUME` has been added. It is a no-op. Performs internal tracing,
debugging and optimization checks.

* opcodes that work with exceptions were adjusted to the change in the
representation of exceptions on the stack from three items to one. (see
:issue:`45711`).

.. _whatsnew311-deprecated:
.. _whatsnew311-python-api-deprecated:
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