[llvm-dev] How to enable AArch64 V8.3A support in clang?

[Gerolf Hoflehner via llvm-dev]

We will push back the full implementation. Stay tuned.

-Gerolf


> On Apr 23, 2019, at 11:13 AM, Ahmed Bougacha via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi Zhang,
> 
> On Tue, Apr 23, 2019 at 10:22 AM Zhang via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>> 
>> Hey:
>> Apple's version of Clang has support for ``-arch arm64e``which enables ARM PAC support. IIRC a few years ago someone from Apple/ARM says they are planning to merge the support back to upstream and judging by my very limited experience with backend it seems to be the case. However I just couldn't get that part to work. Directly using ``-arch arm64e`` doesn't seem to work and results in a ``invalid arch name '-arch arm64e'``.
>> 
>> I then tried multiple combinations like ``-target arm64-apple-ios5.0.0 -march=armv8.3-a`` but has no effect. The binary still doesn't have any V8.3A instructions. Am I missing something here?
> 
> arm64e is only supported by Apple Clang at this time.
> Upstream LLVM/Clang has various bits and pieces, including: full
> assembler/disassembler for v8.3a, some basic codegen (for return
> address signing and v8.5a BTI), and minimal MachO object reading.
> 
> Let me know if you have any questions,
> -Ahmed
> 
>> 
>> Thanks
>> 
>> 
>> Zhang
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