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GH-131033: Enable the optimizing macros UNLIKELY and LIKELY for clang-cl on Windows #131019

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Merged
merged 4 commits into from
Aug 25, 2025
Merged

GH-131033: Enable the optimizing macros UNLIKELY and LIKELY for clang-cl on Windows #131019

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01183d7
Enable XML_ATTR_MALLOC and XML_ATTR_ALLOC_SIZE for
chris-eibl Mar 9, 2025
16a7f46
Enable UNLIKELY and LIKELY for clang-cl on Windows
chris-eibl Mar 9, 2025
1c4a55d
Revert "Enable XML_ATTR_MALLOC and XML_ATTR_ALLOC_SIZE "
chris-eibl Mar 10, 2025
577bba7
update comment
chris-eibl Aug 25, 2025
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4 changes: 2 additions & 2 deletions Objects/obmalloc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1455,9 +1455,9 @@ PyObject_Free(void *ptr)
}


/* If we're using GCC, use __builtin_expect() to reduce overhead of
/* Use __builtin_expect() where available to reduce overhead of
the valgrind checks */
#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#if (defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 2))) && defined(__OPTIMIZE__)
# define UNLIKELY(value) __builtin_expect((value), 0)
# define LIKELY(value) __builtin_expect((value), 1)
#else
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