Sanjay Patel 7393d7574c [InstSimplify] fold fcmp with infinity constant using isKnownNeverInfinity ...

This is a step towards trying to remove unnecessary FP compares
with infinity when compiling with -ffinite-math-only or similar.
I'm intentionally not checking FMF on the fcmp itself because
I'm assuming that will go away eventually.
The analysis part of this was added with rGcd481136 for use with
isKnownNeverNaN. Similarly, that could be an enhancement here to
get predicates like 'one' and 'ueq'.

Differential Revision: https://reviews.llvm.org/D84035

2020-07-19 09:24:52 -04:00

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