aaron.ballman added inline comments.
================
Comment at: include/clang/Basic/Attr.td:1792
+ let Spellings = [GNU<"aarch64_vector_pcs">,
+ CXX11<"clang", "aarch64_vector_pcs">,
+ Keyword<"__aarch64_vector_pcs">,
----------------
Rather than using GNU and CXX11 spellings, you should use the Clang spelling.
If the attribute is not useful in C, then set `allowInC` to 0 instead of its
default of 1.
================
Comment at: include/clang/Basic/Attr.td:1794
+ Keyword<"__aarch64_vector_pcs">,
+ Keyword<"_aarch64_vector_pcs">];
+ let Documentation = [AArch64VectorPcsDocs];
----------------
This steps on the user's namespace -- is that intended and necessary?
================
Comment at: include/clang/Basic/AttrDocs.td:1748
+ let Content = [{
+On 64 bit ARM targets, this argument causes the function to obey the vector
+procedural call standard (VPCS) rules as described in the Vector ABI for
----------------
64 bit -> 64-bit
https://reviews.llvm.org/D54425
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