[all-commits] [llvm/llvm-project] 785337: [LV][AArch64] Don't query registers for illegal sc...

[Graham Hunter via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 785337e2d97a712612a5956657e8dbf1cd140e46
      https://github.com/llvm/llvm-project/commit/785337e2d97a712612a5956657e8dbf1cd140e46
  Author: Graham Hunter <graham.hunter at arm.com>
  Date:   2024-09-23 (Mon, 23 Sep 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    A llvm/test/Transforms/LoopVectorize/AArch64/scalable-fp-ext-trunc-illegal-type.ll

  Log Message:
  -----------
  [LV][AArch64] Don't query registers for illegal scalable vector elts (#109411)

When trying to maximize vector bandwidth we ask TTI for the number of
registers required for a given operation. If the type of that operation
happens to be something illegal for scalable vectors (e.g.
<vscale x 4 x fp128>) then we would see a crash.

Instead, just return a default value and let the cost model reject the
invalid operation later.



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