[all-commits] [llvm/llvm-project] e73bb4: [ARM] VQMOVN demand bits analysis

[David Green via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: e73bb45c2b7bb20eaac230d1708d07c55da47ee2
      https://github.com/llvm/llvm-project/commit/e73bb45c2b7bb20eaac230d1708d07c55da47ee2
  Author: David Green <david.green at arm.com>
  Date:   2020-06-05 (Fri, 05 Jun 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/test/CodeGen/Thumb2/mve-satmul-loops.ll

  Log Message:
  -----------
  [ARM] VQMOVN demand bits analysis

Similar to VMOVN, a VQMOVN will only demand the top/bottom lanes of it's
first input. However unlike VMOVN it will need access to the entire
second argument, as that value is saturated not just moved in place.

Differential Revision: https://reviews.llvm.org/D80515