[llvm] [SPIR-V] Lower llvm.x.with.overflow intrinsics (PR #95012)

[Michal Paszkowski via llvm-commits]

michalpaszkowski wrote:

> > for special handling we have there for aggregates.
> 
> These shouldn't need treatment as aggregates, they will IRTranslate to a return of tuple?

We generate InsertValue instructions which we directly replace in the SPIRVEmitIntrinsics.

https://github.com/llvm/llvm-project/pull/95012