shafik added a comment.

In D146329#4207522 <https://reviews.llvm.org/D146329#4207522>, @royjacobson 
wrote:

> In D146329#4203174 <https://reviews.llvm.org/D146329#4203174>, @shafik wrote:
>
>> I would have loved to test the case from 
>> https://github.com/llvm/llvm-project/issues/61335 directly but I think in 
>> order to do it nicely I need `__builtin_memset` to be usable in a constant 
>> expression context. I will add this to my todo list. I am open to other 
>> alternatives for testing this.
>
> I managed to generate relatively readable LLVM IR for this: 
> https://godbolt.org/z/z1YzoEcr3 (the generated equality operators are 
> obviously not correct yet), I think matching against that is testing the 
> issue pretty well.
>
> (The trick to making it readable was turning on optimization, though. Not 
> sure if we usually do that)

I think in general we can't rely on optimizations in test like this but wdyt 
@erichkeane


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