[all-commits] [llvm/llvm-project] ee572e: [AArch64] Optimize when storing symmetry constants...

[hanbeom via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ee572ed4ac2d9e2ff37217d6bedc20f530a5d3af
      https://github.com/llvm/llvm-project/commit/ee572ed4ac2d9e2ff37217d6bedc20f530a5d3af
  Author: hanbeom <kese111 at gmail.com>
  Date:   2024-08-20 (Tue, 20 Aug 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
    M llvm/test/CodeGen/AArch64/movimm-expand-ldst.ll
    M llvm/test/CodeGen/AArch64/movimm-expand-ldst.mir

  Log Message:
  -----------
  [AArch64] Optimize when storing symmetry constants (#93717)

This change looks for instructions of storing symmetric constants
instruction 32-bit units. usually consisting of several 'MOV' and
one or less 'ORR'.

If found, load only the lower 32-bit constant and change it to copy
and save to the upper 32-bit using the 'STP' instruction.

For example:
  renamable $x8 = MOVZXi 49370, 0
  renamable $x8 = MOVKXi $x8, 320, 16
  renamable $x8 = ORRXrs $x8, $x8, 32
  STRXui killed renamable $x8, killed renamable $x0, 0
becomes
  $w8 = MOVZWi 49370, 0
  $w8 = MOVKWi $w8, 320, 16
STPWi killed renamable $w8, killed renamable $w8, killed renamable $x0,
0


related issue : https://github.com/llvm/llvm-project/issues/51483



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