Sanjay Patel 3491f2f4b0 [InstCombine] replace negated operand in fcmp with 0.0 ...

X (any pred) -X --> X (any pred) 0.0

This works with all FP values and preserves FMF.
Alive2 examples:
https://alive2.llvm.org/ce/z/dj6jhp

This can also create one of the patterns that we match as "fabs"
as shown in one of the test diffs.

2022-03-10 12:53:32 -05:00

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