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[mypyc] Add comment about incref/decref and free-threaded builds #19155

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May 28, 2025
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[mypyc] Add comment about incref/decref and free-threaded builds #19155

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3 changes: 3 additions & 0 deletions mypyc/lib-rt/mypyc_util.h
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,9 @@
//
// Py_INCREF and other CPython operations check for immortality. This
// can be expensive when we know that an object cannot be immortal.
//
// This optimization cannot be performed in free-threaded mode so we
// fall back to just calling the normal incref/decref operations.

static inline void CPy_INCREF_NO_IMM(PyObject *op)
{
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