how to simplify FP ops with an undef operand?

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41

I agree. Tracking the signbit might be interesting sometimes, but it’s a second-order effect.

– Steve

42

For reference, some patches based on this discussion:
https://reviews.llvm.org/D44258
https://reviews.llvm.org/D44216
https://reviews.llvm.org/D44308
https://reviews.llvm.org/D44318

Thanks to all for your help cleaning this up.