[all-commits] [llvm/llvm-project] b0ffaa: [AArch64] Prevent the AArch64LoadStoreOptimizer fr...

[Momchil Velikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0ffaa79050460d724eec1b12363c439b43d5ae5
      https://github.com/llvm/llvm-project/commit/b0ffaa79050460d724eec1b12363c439b43d5ae5
  Author: Momchil Velikov <momchil.velikov at arm.com>
  Date:   2024-09-10 (Tue, 10 Sep 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
    M llvm/test/CodeGen/AArch64/build-one-lane.ll
    M llvm/test/CodeGen/AArch64/insertextract.ll
    A llvm/test/CodeGen/AArch64/no-reorder-cfi-merge-back-load.mir
    A llvm/test/CodeGen/AArch64/no-reorder-cfi-merge-back-store.mir
    A llvm/test/CodeGen/AArch64/no-reorder-cfi-merge-fwd-load.mir
    A llvm/test/CodeGen/AArch64/no-reorder-cfi-merge-fwd.mir
    A llvm/test/CodeGen/AArch64/no-reorder-cfi-no-merge.mir
    A llvm/test/CodeGen/AArch64/no-reorder-cfi.ll
    M llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-bit-counting.ll
    M llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-insert-vector-elt.ll
    M llvm/test/CodeGen/AArch64/vector-compress.ll

  Log Message:
  -----------
  [AArch64] Prevent the AArch64LoadStoreOptimizer from reordering CFI instructions (#101317)

When AArch64LoadStoreOptimizer pass merges an SP update with a
load/store instruction and needs to adjust unwind information either:
* create the merged instruction at the location of the SP update
  (so no CFI  instructions are moved), or
* only move a CFI instruction if the move would not reorder it across
  other CFI  instructions

If neither of the above is possible, don't perform the optimisation.



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