[llvm-dev] [RFC] We are running out of slots in the Attribute::AttrKind enum

[Snider, Todd via llvm-dev]

I would like to add a target-dependent attribute to the LLVM IR, and the guidance in http://llvm.org/docs/HowToUseAttributes.html says that target-dependent attributes should not occupy a slot in the Attribute::AttrKind enum, but I have yet to find an attribute that is represented in the IR that does not also have a slot in the AttrKind enum.

We are limited to 63 slots in the AttrKind enum because it is represented in the bitcode with a 64-bit bitmask. There is only one free slot left and I don't want to use it for a target-dependent attribute. I had anticipated that only target-independent attributes would have analogous ATTR_KIND identifiers in the AtttrKind enum, yet the ARM-specific CMSE_NS_CALL and CMSE_NS_ENTRY occupy slots in the AttrKind enum.

Can someone point me to an example of a target-dependent attribute represented in the LLVM IR that does not occupy a slot in the AttrKind enum?

Thanks,

Todd Snider
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