wzssyqa wrote:

> > 3. PowerPC: has some interaction with the behavior of `minnum/maxnum`: need 
> > define `fcanonicalize`.
> 
> AMDGPU has the same handling. This is to break the signaling nan handling 
> from IEEE to the broken old glibc libm behavior. If we fix the definition to 
> match IEEE, this is no longer necessary and the operation is directly legal

Added to TODO list.

https://github.com/llvm/llvm-project/pull/93841
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