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

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alex-t 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 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.


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