alexey-bataev wrote:

> > Yep, we see that memcpy intrinsics started to be expanded into loops
> 
> Are you using a custom pass pipeline? You will need something like 
> [halide/Halide#8892](https://github.com/halide/Halide/pull/8892) or all of 
> the libcalls will be marked as unsupported. If you have a custom target you 
> might need to update `RuntimeLibcalls.td` so that memcpy and friends are 
> enabled.
> 
> If this is with upstream clang/flang, this would be more concerning, but it 
> does not seem like there are any regressions there. There are a decent amount 
> of memory libcall lowering tests.

It is flang, at least

https://github.com/llvm/llvm-project/pull/171452
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