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gh-130704: Strength reduce LOAD_FAST{_LOAD_FAST} (#130708)

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Optimize `LOAD_FAST` opcodes into faster versions that load borrowed references onto the operand stack when we can prove that the lifetime of the local outlives the lifetime of the temporary that is loaded onto the stack.
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mpage 2025-04-01 10:18:42 -07:00 • committed by GitHub
parent e9556e1004
commit 053c285f6b
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35 changed files with 1282 additions and 345 deletions
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31
Objects/floatobject.c
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@ -135,8 +135,6 @@ PyFloat_FromDouble(double fval)
return (PyObject *) op;
}
#ifdef Py_GIL_DISABLED
_PyStackRef _PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value)
{
PyStackRef_CLOSE_SPECIALIZED(left, _PyFloat_ExactDealloc);
@ -144,35 +142,6 @@ _PyStackRef _PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef righ
return PyStackRef_FromPyObjectSteal(PyFloat_FromDouble(value));
}
#else // Py_GIL_DISABLED
_PyStackRef _PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value)
{
PyObject *left_o = PyStackRef_AsPyObjectBorrow(left);
PyObject *right_o = PyStackRef_AsPyObjectBorrow(right);
if (Py_REFCNT(left_o) == 1) {
((PyFloatObject *)left_o)->ob_fval = value;
PyStackRef_CLOSE_SPECIALIZED(right, _PyFloat_ExactDealloc);
return left;
}
else if (Py_REFCNT(right_o) == 1) {
((PyFloatObject *)right_o)->ob_fval = value;
PyStackRef_CLOSE_SPECIALIZED(left, _PyFloat_ExactDealloc);
return right;
}
else {
PyObject *result = PyFloat_FromDouble(value);
PyStackRef_CLOSE_SPECIALIZED(left, _PyFloat_ExactDealloc);
PyStackRef_CLOSE_SPECIALIZED(right, _PyFloat_ExactDealloc);
if (result == NULL) {
return PyStackRef_NULL;
}
return PyStackRef_FromPyObjectStealMortal(result);
}
}
#endif // Py_GIL_DISABLED
static PyObject *
float_from_string_inner(const char *s, Py_ssize_t len, void *obj)
{