Sanjay Patel 5d7d689edf [InstCombine] fix propagation of FMF through select-of-fnegs ...

The existing code was unquestionably wrong - it looked at one
fneg and ignored the other 2 instructions.

It was also untested, so it didn't make the list of bugs
flagged by Alive2.

This is an unusual propagation, but Alive2 agress that we
can intersect the fnegs and union that with the select,
then apply the results to both new instructions:
https://alive2.llvm.org/ce/z/SF8_dt

2021-08-31 09:52:17 -04:00

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