[PATCH] D122281: [AArch64][SelectionDAG] Refactor to support more scalable vector extending loads

[Allen zhong via Phabricator via llvm-commits]

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Accord the discussion in D120953 <https://reviews.llvm.org/D120953>, we should firstly exclude all scalable vector
extending loads and then selectively enable those which we directly support.

This patch is intend to refactor for above (truncating stores is not touched).


https://reviews.llvm.org/D122281

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-intrinsics-ldst-ext.ll
  llvm/test/CodeGen/AArch64/sve-intrinsics-mask-ldst-ext.ll
  llvm/test/CodeGen/AArch64/sve-masked-ldst-sext.ll

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