[all-commits] [llvm/llvm-project] 775d0f: [GVN] Handle scalable vectors with the same size i...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 775d0f36f74851172f84074d90cde29e181b3edd
      https://github.com/llvm/llvm-project/commit/775d0f36f74851172f84074d90cde29e181b3edd
  Author: David Green <david.green at arm.com>
  Date:   2025-01-23 (Thu, 23 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/Utils/VNCoercion.cpp
    M llvm/test/Transforms/GVN/vscale.ll

  Log Message:
  -----------
  [GVN] Handle scalable vectors with the same size in VNCoercion (#123984)

This allows us to forward to a load even if the types do not match
(nxv4i32 vs nxv2i64 for example). Scalable types are allowed in
canCoerceMustAliasedValueToLoad so long as the size (minelts *
scalarsize) is the same, and some follow-on code is adjusted to make
sure it handles scalable sizes correctly. Methods like
analyzeLoadFromClobberingWrite and analyzeLoadFromClobberingStore still
do nothing for scalable vectors, as Offsets and mismatching types are
not supported.



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