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bpo-45116: Py_DEBUG ignores Py_ALWAYS_INLINE (GH-28419)
If the Py_DEBUG macro is defined, the Py_ALWAYS_INLINE macro does nothing.
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@ -124,6 +124,9 @@ complete listing.
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worse performances (due to increased code size for example). The compiler is
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usually smarter than the developer for the cost/benefit analysis.
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If Python is :ref:`built in debug mode <debug-build>` (if the ``Py_DEBUG``
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macro is defined), the :c:macro:`Py_ALWAYS_INLINE` macro does nothing.
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It must be specified before the function return type. Usage::
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static inline Py_ALWAYS_INLINE int random(void) { return 4; }
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@ -568,10 +568,19 @@ extern "C" {
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// worse performances (due to increased code size for example). The compiler is
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// usually smarter than the developer for the cost/benefit analysis.
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//
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// If Python is built in debug mode (if the Py_DEBUG macro is defined), the
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// Py_ALWAYS_INLINE macro does nothing.
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//
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// It must be specified before the function return type. Usage:
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//
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// static inline Py_ALWAYS_INLINE int random(void) { return 4; }
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#if defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
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#if defined(Py_DEBUG)
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// If Python is built in debug mode, usually compiler optimizations are
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// disabled. In this case, Py_ALWAYS_INLINE can increase a lot the stack
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// memory usage. For example, forcing inlining using gcc -O0 increases the
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// stack usage from 6 KB to 15 KB per Python function call.
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# define Py_ALWAYS_INLINE
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#elif defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
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# define Py_ALWAYS_INLINE __attribute__((always_inline))
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#elif defined(_MSC_VER)
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# define Py_ALWAYS_INLINE __forceinline
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