New submission from Mark Shannon <m...@hotpy.org>:
Currently the unpacking of starred values in arguments and the right hand side of assignments is handled in the interpreter without any help from the compiler. The layout of arguments and values is visible to the compiler, so the compiler should do more of the work. We can replace the complex bytecodes used in unpacking with simpler more focused ones. Specifically the collection building operations BUILD_LIST_UNPACK, BUILD_TUPLE_UNPACK, BUILD_SET_UNPACK and BUILD_TUPLE_UNPACK_WITH_CALL can be replaced with simpler, and self-explanatory operations: LIST_TO_TUPLE, LIST_EXTEND, SET_UPDATE In addition, the mapping operations BUILD_MAP_UNPACK and BUILD_MAP_UNPACK_WITH_CALL can be replaced with DICT_UPDATE and DICT_MERGE. DICT_MERGE is like DICT_UPDATE but raises an exception for duplicate keys. This change would not have much of an effect of performance, as the bytecodes listed are relatively rarely used, but shrinking the interpreter is always beneficial. ---------- components: Interpreter Core messages: 359901 nosy: Mark.Shannon priority: normal severity: normal status: open title: Handle unpacking of */** arguments and rvalues in the compiler type: performance versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39320> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
