[PATCH] D97788: [ARM] KnownBits for CSINC/CSNEG/CSINV

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: simon_tatham, ostannard, SjoerdMeijer, efriedma.
Herald added subscribers: danielkiss, zzheng, hiraditya, kristof.beyls, mgorny.
dmgreen requested review of this revision.
Herald added a project: LLVM.

This adds some simple known bits handling for the three CSINC/NEG/INV instructions. From the operands known bits we can compute the common bits of the first operand and incremented/negated/inverted second operand.  The first, especially `CSINC ZR, ZR`, comes up fair amount in the tests. The others are more rare so a unit test for them is added.


https://reviews.llvm.org/D97788

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/fast-fp-loops.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-float-loops.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-tail-data-types.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/reductions.ll
  llvm/test/CodeGen/Thumb2/active_lane_mask.ll
  llvm/test/CodeGen/Thumb2/mve-ctlz.ll
  llvm/test/CodeGen/Thumb2/mve-cttz.ll
  llvm/test/CodeGen/Thumb2/mve-fmas.ll
  llvm/test/CodeGen/Thumb2/mve-fmath.ll
  llvm/test/CodeGen/Thumb2/mve-laneinterleaving.ll
  llvm/test/CodeGen/Thumb2/mve-masked-store.ll
  llvm/test/CodeGen/Thumb2/mve-nounrolledremainder.ll
  llvm/test/CodeGen/Thumb2/mve-pred-and.ll
  llvm/test/CodeGen/Thumb2/mve-pred-bitcast.ll
  llvm/test/CodeGen/Thumb2/mve-pred-build-var.ll
  llvm/test/CodeGen/Thumb2/mve-pred-loadstore.ll
  llvm/test/CodeGen/Thumb2/mve-pred-not.ll
  llvm/test/CodeGen/Thumb2/mve-pred-or.ll
  llvm/test/CodeGen/Thumb2/mve-pred-vselect.ll
  llvm/test/CodeGen/Thumb2/mve-pred-xor.ll
  llvm/test/CodeGen/Thumb2/mve-saturating-arith.ll
  llvm/test/CodeGen/Thumb2/mve-selectcc.ll
  llvm/test/CodeGen/Thumb2/mve-vcmp.ll
  llvm/test/CodeGen/Thumb2/mve-vcmpf.ll
  llvm/test/CodeGen/Thumb2/mve-vcmpfr.ll
  llvm/test/CodeGen/Thumb2/mve-vcmpfz.ll
  llvm/test/CodeGen/Thumb2/mve-vcmpr.ll
  llvm/test/CodeGen/Thumb2/mve-vcmpz.ll
  llvm/test/CodeGen/Thumb2/mve-vecreduce-addpred.ll
  llvm/test/CodeGen/Thumb2/mve-vecreduce-mlapred.ll
  llvm/test/CodeGen/Thumb2/mve-vmovimm.ll
  llvm/unittests/Target/ARM/ARMSelectionDAGTest.cpp
  llvm/unittests/Target/ARM/CMakeLists.txt

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