[all-commits] [llvm/llvm-project] 35e056: [ARM] Add VREV MVE shuffle costs

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 35e0567d58c20fa7ee1cbc09de9f5c90036af6f5
      https://github.com/llvm/llvm-project/commit/35e0567d58c20fa7ee1cbc09de9f5c90036af6f5
  Author: David Green <david.green at arm.com>
  Date:   2021-03-17 (Wed, 17 Mar 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.h
    M llvm/test/Analysis/CostModel/ARM/shuffle.ll

  Log Message:
  -----------
  [ARM] Add VREV MVE shuffle costs

This uses the shuffle mask cost from D98206 to give a better cost of MVE
VREV instructions. This helps especially in VectorCombine where the cost
of shuffles is used to reorder bitcasts, which this helps keep the phase
ordering test for fp16 reductions producing optimal code. The isVREVMask
has been moved to a header file to allow it to be used across target
transform and isel lowering.

Differential Revision: https://reviews.llvm.org/D98210