[llvm] SelectionDAG: Use qNaN constant if FCANONICALIZE not LegalOrCustom (PR #104564)

[Pawan Nirpal via llvm-commits]

pawan-nirpal-031 wrote:

Hi @arsenm can you clarify my query? Is this PR trying to achieve the same goal as mine, If not I can keep preparing my patch, which I plan to submit in a few days.

https://github.com/llvm/llvm-project/pull/104564