[all-commits] [llvm/llvm-project] f5abf0: [ARM] Tail predication with constant loop bounds

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f5abf0bd485a1fa7e332f5f8266c25755d385a8a
      https://github.com/llvm/llvm-project/commit/f5abf0bd485a1fa7e332f5f8266c25755d385a8a
  Author: David Green <david.green at arm.com>
  Date:   2021-01-15 (Fri, 15 Jan 2021)

  Changed paths:
    M llvm/lib/Target/ARM/MVETailPredication.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/constbound.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/tp-multiple-vpst.ll

  Log Message:
  -----------
  [ARM] Tail predication with constant loop bounds

The TripCount for a predicated vector loop body will be
ceil(ElementCount/Width). This alters the conversion of an
active.lane.mask to a VCPT intrinsics to match.

Differential Revision: https://reviews.llvm.org/D94608