[all-commits] [llvm/llvm-project] 54d862: [AArch64] Redundant masks in downcast long multiply

[NickGuy-Arm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 54d8627852a60e648022392ca316175911025eb9
      https://github.com/llvm/llvm-project/commit/54d8627852a60e648022392ca316175911025eb9
  Author: Nicholas Guy <nicholas.guy at arm.com>
  Date:   2020-11-03 (Tue, 03 Nov 2020)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    A llvm/test/CodeGen/AArch64/aarch64-mull-masks.ll

  Log Message:
  -----------
  [AArch64] Redundant masks in downcast long multiply

Adds patterns to catch masks preceeding a long multiply,
and generating a single umull/smull instruction instead.

Differential revision: https://reviews.llvm.org/D89956