[clang][docs] Clarify the tail padding considered by __datasizeof
#125981
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@llvm/pr-subscribers-clang Author: A. Jiang (frederick-vs-ja) ChangesSome tail padding are not reusable due to the ABI specification, and Closes #125863. Full diff: https://github.com/llvm/llvm-project/pull/125981.diff 1 Files Affected:
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index dd7513ceaa4e4b..a779064e84cb40 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -432,7 +432,7 @@ __datasizeof
------------
``__datasizeof`` behaves like ``sizeof``, except that it returns the size of the
-type ignoring tail padding.
+type ignoring reusable tail padding according to the ABI.
_BitInt, _ExtInt
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Some tail padding are not reusable due to the ABI specification, and
__datasizeofintentionally doesn't consider them.Closes #125863.