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Diffstat (limited to 'docs/LangRef.rst')
| -rw-r--r-- | docs/LangRef.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 62ce112d57..07e94a9f84 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -792,7 +792,10 @@ Currently, only the following parameter attributes are defined: An argument allocation may be used by a call at most once because the call may deallocate it. The ``inalloca`` attribute cannot be used in conjunction with other attributes that affect argument - storage, like ``inreg``, ``nest``, ``sret``, or ``byval``. + storage, like ``inreg``, ``nest``, ``sret``, or ``byval``. The + ``inalloca`` attribute also disables LLVM's implicit lowering of + large aggregate return values, which means that frontend authors + must lower them with ``sret`` pointers. When the call site is reached, the argument allocation must have been the most recent stack allocation that is still live, or the |