[PATCH] D79636: [LangRef] Clarify the semantics of the `byval` attribute

[Reid Kleckner via Phabricator via cfe-commits]

rnk added a comment.

Some copy editing comments, but I agree with the semantics: From the IR perspective, it is better to think of argument stack memory as belonging to the callee. A byval argument has more in common with a local static alloca than a passed in pointer.



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Comment at: llvm/docs/LangRef.rst:1046
     structs and arrays by value, but is also valid on pointers to
-    scalars. The copy is considered to belong to the caller not the
-    callee (for example, ``readonly`` functions should not write to
-    ``byval`` parameters). This is not a valid attribute for return
-    values.
+    scalars The copy is conceptually made on the call edge. This means that
+    the pointer argument at the call site refers to the original memmory and
----------------
Missing period? "scalars The copy"


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Comment at: llvm/docs/LangRef.rst:1047
+    scalars The copy is conceptually made on the call edge. This means that
+    the pointer argument at the call site refers to the original memmory and
+    the pointer argument in the callee is refering to the copy. Attributes on
----------------
typo "memmory"


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