diff options
Diffstat (limited to 'llvm/docs/LangRef.rst')
| -rw-r--r-- | llvm/docs/LangRef.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index 840272df33f..2105ce9d669 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -1017,7 +1017,7 @@ Currently, only the following parameter attributes are defined: opposed to memory, though some targets use it to distinguish between two different kinds of registers). Use of this attribute is target-specific. -``byval`` +``byval`` or ``byval(<ty>)`` This indicates that the pointer parameter should really be passed by value to the function. The attribute implies that a hidden copy of the pointee is made between the caller and the callee, so the callee @@ -1029,6 +1029,9 @@ Currently, only the following parameter attributes are defined: ``byval`` parameters). This is not a valid attribute for return values. + The byval attribute also supports an optional type argument, which must be + the same as the pointee type of the argument. + The byval attribute also supports specifying an alignment with the align attribute. It indicates the alignment of the stack slot to form and the known alignment of the pointer specified to the call |
