[PATCH] D64616: [ARM][LowOverheadLoops] Fix branch target codegen

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: dmgreen, SjoerdMeijer.
Herald added subscribers: kristof.beyls, javed.absar.

While lowering test.set.loop.iterations, it wasn't checked how the brcond was using the result and so the wls could branch to the loop preheader instead of not entering it. The same was true for loop.decrement.reg.
So brcond and br_cc and now lowered manually when using the hwloop intrinsics. During this we now check whether the result has been negated and whether we're using SETEQ or SETNE and 0 or 1. We can then figure out which basic block the WLS and LE should be targeting.


https://reviews.llvm.org/D64616

Files:
  lib/Target/ARM/ARMISelDAGToDAG.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/ARM/ARMInstrInfo.td
  test/CodeGen/Thumb2/LowOverheadLoops/branch-targets.ll

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