8000 bpo-45116: Add the Py_ALWAYS_INLINE macro by vstinner · Pull Request #28390 · python/cpython · GitHub
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bpo-45116: Add the Py_ALWAYS_INLINE macro #28390

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Merged
merged 3 commits into from
Sep 17, 2021
Merged

bpo-45116: Add the Py_ALWAYS_INLINE macro #28390

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bpo-45116: Add the Py_ALWAYS_INLINE macro
vstinner Sep 16, 2021
fa020c8
Rephrase the doc
vstinner Sep 16, 2021
73e5d10
Reformat the doc
vstinner Sep 16, 2021
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Rephrase the doc
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@vstinner
vstinner committed Sep 16, 2021
commit fa020c890a68c142bdfda1f4824ce697e4124fb1
5 changes: 2 additions & 3 deletions Doc/c-api/intro.rst
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Expand Up @@ -116,10 +116,9 @@ complete listing.
Ask the compiler to always inline a static inline function. The compiler can
ignore it and decides to not inline the function.

This attribute can be used to avoid increasing the stack memory usage when
It can be used to inline performance critical static inline functions when
building Python in debug mode with function inlining disabled. For example,
MSC disables function inlining when building in debug mode. It should be
used on the most commonly used static inline functions.
MSC disables function inlining when building in debug mode.

Marking blindly a static inline function with Py_ALWAYS_INLINE can result in
worse performances (due to increased code size for example). The compiler is
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5 changes: 2 additions & 3 deletions Include/pyport.h
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Expand Up @@ -560,10 +560,9 @@ extern "C" {
// Ask the compiler to always inline a static inline function. The compiler can
// ignore it and decides to not inline the function.
//
// This attribute can be used to avoid increasing the stack memory usage when
// It can be used to inline performance critical static inline functions when
// building Python in debug mode with function inlining disabled. For example,
// MSC disables function inlining when building in debug mode. It should be
// used on the most commonly used static inline functions.
// MSC disables function inlining when building in debug mode.
//
// Marking blindly a static inline function with Py_ALWAYS_INLINE can result in
// worse performances (due to increased code size for example). The compiler is
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