[PATCH] D152113: DAG: Lower is.fpclass fcSubnormal|fcZero to fabs(x) < smallest_normal

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: jcranmer-intel, sepavloff, kpn, andrew.w.kaylor, spatel, RKSimon.
Herald added subscribers: StephenFan, pengfei, hiraditya.
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arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

Produces better code on x86_64 only in the unordered case. Not
sure what the exact condition should be to avoid the regression. Free
fabs might do it, or maybe requires legality checks for the alternative
integer expansion.


https://reviews.llvm.org/D152113

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/X86/is_fpclass.ll

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