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bpo-47053: Reduce deoptimization in BINARY_OP_INPLACE_ADD_UNICODE (GH-31318)

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* Don't deopt if refcounts are too big

* Detect more at specialization time
This commit is contained in:
Dennis Sweeney 2022-03-25 12:13:19 -04:00 • committed by GitHub
parent d7163bb35d
commit cca43b7d64
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4 changed files with 11 additions and 7 deletions
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9
Python/ceval.c
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@ -2002,10 +2002,10 @@ handle_eval_breaker:
PyObject *right = TOP();
DEOPT_IF(!PyUnicode_CheckExact(left), BINARY_OP);
DEOPT_IF(Py_TYPE(right) != Py_TYPE(left), BINARY_OP);
DEOPT_IF(Py_REFCNT(left) != 2, BINARY_OP);
_Py_CODEUNIT true_next = next_instr[INLINE_CACHE_ENTRIES_BINARY_OP];
int next_oparg = _Py_OPARG(true_next);
assert(_Py_OPCODE(true_next) == STORE_FAST);
assert(_Py_OPCODE(true_next) == STORE_FAST ||
_Py_OPCODE(true_next) == STORE_FAST__LOAD_FAST);
/* In the common case, there are 2 references to the value
* stored in 'variable' when the v = v + ... is performed: one
* on the value stack (in 'v') and one still stored in the
@ -2016,7 +2016,8 @@ handle_eval_breaker:
DEOPT_IF(var != left, BINARY_OP);
STAT_INC(BINARY_OP, hit);
GETLOCAL(next_oparg) = NULL;
Py_DECREF(left);
assert(Py_REFCNT(left) >= 2);
Py_DECREF(left); // XXX never need to dealloc
STACK_SHRINK(1);
PyUnicode_Append(&TOP(), right);
Py_DECREF(right);
@ -5378,7 +5379,7 @@ handle_eval_breaker:
PyObject *lhs = SECOND();
PyObject *rhs = TOP();
next_instr--;
_Py_Specialize_BinaryOp(lhs, rhs, next_instr, oparg);
_Py_Specialize_BinaryOp(lhs, rhs, next_instr, oparg, &GETLOCAL(0));
DISPATCH();
}
else {