Sanjay Patel bfd512160f [InstCombine] improve analysis of FP->int->FP to eliminate fpextend ...

This was originally in D79116.
Converting from a narrow-enough FP source value to integer and
back to FP guarantees that the conversion to FP is exact because
of UB/poison-on-overflow.

This was suggested in PR36617:
https://bugs.llvm.org/show_bug.cgi?id=36617#c19

2020-05-17 09:06:57 -04:00

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