[all-commits] [llvm/llvm-project] b576a6: [X86][AMX] Fix a bug after #83628 (#91207)

[Phoebe Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b576a6b0452b9bfb634feaa215506d8a1afe857d
      https://github.com/llvm/llvm-project/commit/b576a6b0452b9bfb634feaa215506d8a1afe857d
  Author: Phoebe Wang <phoebe.wang at intel.com>
  Date:   2024-05-15 (Wed, 15 May 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86LowerTileCopy.cpp
    M llvm/test/CodeGen/X86/AMX/amx-tile-basic.ll

  Log Message:
  -----------
  [X86][AMX] Fix a bug after #83628 (#91207)

We need to check if `GR64Cand` a valid register before using it.

Test is not needed since it's covered in llvm-test-suite.

Fixes #90954



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