[PATCH] D71816: [DAGCombiner] Add combine for (not (strict_fsetcc)) to create a strict_fsetcc with the opposite condition.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: spatel, RKSimon.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
craig.topper added reviewers: uweigand, andrew.w.kaylor, kpn, pengfei, LiuChen3.

Unlike the existing code that I modified here, I only handle the
case where the strict_fsetcc has a single use. Not sure exactly
how to handle multiples uses.

Testing this on X86 is hard because we already have a other
combines that rid of lowered version of the integer setcc that
this xor will eventually become. So this combine really just
saves a bunch of extra nodes being created. Not sure about other
targets.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71816

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/X86/fp-strict-scalar-cmp.ll

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