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GH-125837: Split LOAD_CONST into three. (GH-125972)

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* Add LOAD_CONST_IMMORTAL opcode

* Add LOAD_SMALL_INT opcode

* Remove RETURN_CONST opcode
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Mark Shannon 2024-10-29 11:15:42 +00:00 • committed by GitHub
parent 67f5c5bd6f
commit faa3272fb8
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33 changed files with 706 additions and 538 deletions
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14
Python/specialize.c
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@ -442,11 +442,13 @@ _PyCode_Quicken(PyCodeObject *code)
{
#if ENABLE_SPECIALIZATION
int opcode = 0;
int oparg = 0;
_Py_CODEUNIT *instructions = _PyCode_CODE(code);
/* The last code unit cannot have a cache, so we don't need to check it */
for (int i = 0; i < Py_SIZE(code)-1; i++) {
opcode = instructions[i].op.code;
int caches = _PyOpcode_Caches[opcode];
oparg = (oparg << 8) | instructions[i].op.arg;
if (caches) {
// The initial value depends on the opcode
switch (opcode) {
@ -465,6 +467,18 @@ _PyCode_Quicken(PyCodeObject *code)
}
i += caches;
}
else if (opcode == LOAD_CONST) {
/* We can't do this in the bytecode compiler as
* marshalling can intern strings and make them immortal. */
PyObject *obj = PyTuple_GET_ITEM(code->co_consts, oparg);
if (_Py_IsImmortal(obj)) {
instructions[i].op.code = LOAD_CONST_IMMORTAL;
}
}
if (opcode != EXTENDED_ARG) {
oparg = 0;
}
}
#endif /* ENABLE_SPECIALIZATION */
}