[llvm] [AMDGPU] Automatic conversion from wave32 to wave64 (PR #137376)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> > I am not sure what do you mean, but it sounds you are referring to intrinsics accessing wave size since these need such mangling. That shall not be allowed.
> 
> @llvm.read_register.i32( some regular reg) is allowed as it is not convergent and does not read/write exec or vcc. We should use llvm.read_register.i64 instead if convert the caller kernel to wave64, otherwise it only will read a low half of the register.

You cannot do it and keep the semantics. Just bail on any use of these intrinsics regardless of a register accessed.

https://github.com/llvm/llvm-project/pull/137376