Sanjay Patel 598721f866 [InstCombine] try harder to propagate 'nsz' through fneg-of-select ...

This can be viewed as swapping the select arms:
https://alive2.llvm.org/ce/z/jUvFMJ
...so we don't have the 'nsz' problem with the more general fold.

This unlocks other folds for the motivating fabs example.
This was discussed in issue #38828.

2022-03-15 11:05:29 -04:00

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