target_clones: molehill or everest?

[Bruce Carneal]

On Tuesday, 7 June 2022 at 16:15:03 UTC, Bruce Carneal wrote:
> On Tuesday, 7 June 2022 at 15:50:56 UTC, kinke wrote:
>> On Tuesday, 7 June 2022 at 14:18:11 UTC, Bruce Carneal wrote:
>>> Would adding clang's *target_clones* attribute be difficult?
>>
>> Hmm, it's apparently not supported in LLVM IR directly; the IR 
>> changes for clang are substantial: 
>> https://cpp.godbolt.org/z/WT56axqj1
>>
>> So unless the LLVM API provides a helper (mainly generating 
>> the resolver with its conditions depending on some 
>> `__cpu_indicator_init()` and `__cpu_model`), it's probably 
>> difficult indeed.
>
> Thanks for checking.  I'll look at gcd (thanks Iain) and at 
> another CT hack that groups and manages the target funcs 
> manually.

Sorry, gdc.