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Summary

  1. [SimplifyCFG] propagate fast-math-flags (FMF) from phi to select (details)
Commit ebf9bf2cbc8fa68d536e481e370c4ba40ce61a8a by spatel
[SimplifyCFG] propagate fast-math-flags (FMF) from phi to select
Similar to/extension of D70208 (rGee0882bdf866), but this one may
finally allow closing motivating bugs.
This is another step towards having FMF apply only to FP values rather
than those + fcmp. See PR38086 for one of the original
discussions/motivations: https://bugs.llvm.org/show_bug.cgi?id=38086
And the test here is derived from PR39535:
https://bugs.llvm.org/show_bug.cgi?id=39535
Currently, we lose FMF when converting any phi to select in SimplifyCFG.
There are a small number of similar changes needed to correct within
SimplifyCFG, so it should be quick to patch this pass up.
FMF was extended to select and phi with: D61917 D67564
The file was modifiedllvm/test/Transforms/SimplifyCFG/speculate-math.ll
The file was modifiedllvm/lib/Transforms/Utils/SimplifyCFG.cpp