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gh-131798: JIT: Optimize _CALL_LEN when the length is known - #135260
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tomasr8 merged 4 commits intoJun 20, 2025
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tomasr8
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Jun 8, 2025
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Python/optimizer_bytecodes.c
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| int tuple_length = sym_tuple_length(arg); | ||
| if (tuple_length >= 0) { | ||
| PyObject *temp = PyLong_FromLong(tuple_length); | ||
| if (temp == NULL) { | ||
| goto error; | ||
| } | ||
| if (_Py_IsImmortal(temp)) { | ||
| REPLACE_OP(this_instr, _POP_CALL_ONE_LOAD_CONST_INLINE_BORROW, | ||
| 0, (uintptr_t)temp); | ||
| } | ||
| res = sym_new_const(ctx, temp); | ||
| Py_DECREF(temp); | ||
| } |
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This is basically copied from the recent _GET_LEN optimization
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Lib/test/test_capi/test_opt.py
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brandtbucher
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Jun 9, 2025
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Looks good! I'll leave this for you to merge yourself. ;)
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I'm planning to merge this once the tests pass :) |
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Pranjal095
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Jul 12, 2025
…thon#135260) * Add news entry * Optimize _CALL_LEN * Simplify tests
taegyunkim
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Aug 4, 2025
…thon#135260) * Add news entry * Optimize _CALL_LEN * Simplify tests
Agent-Hellboy
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Aug 19, 2025
…thon#135260) * Add news entry * Optimize _CALL_LEN * Simplify tests
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This uses the same principle as #135194 to completely remove _CALL_LEN when the length is known.
I don't know how common it is to actually know the length exactly so please let me know if this is not worth it, but given that _CALL_LEN is the most common builtin call, it felt worth to optimize this case.