[all-commits] [llvm/llvm-project] e7a4a2: [TargetLowering] Improve expansion of ROTL/ROTR

[jayfoad via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: e7a4a24dc50ab115cd0838bbf47d61251530a0cd
      https://github.com/llvm/llvm-project/commit/e7a4a24dc50ab115cd0838bbf47d61251530a0cd
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2020-07-06 (Mon, 06 Jul 2020)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

  Log Message:
  -----------
  [TargetLowering] Improve expansion of ROTL/ROTR

Using a negation instead of a subtraction from a constant can save an
instruction on some targets.

Nothing much uses this until D77152 changes the translation of fshl and
fshr intrinsics.

Differential Revision: https://reviews.llvm.org/D82539