[llvm-branch-commits] [llvm] [AArch64][GlobalISel] Avoid splitting loads of large vector types into individual element loads (PR #85042)

[David Green via llvm-branch-commits]

https://github.com/davemgreen commented:

It looks like this comes from the lowerIfMemSizeNotByteSizePow2. Custom is often best avoided unless there is not anther way, or the change is quite target-dependant.

Can we try something like this instead?
```
      .clampMaxNumElements(0, s8, 16)
      .clampMaxNumElements(0, s16, 8)
      .clampMaxNumElements(0, s32, 4)
      .clampMaxNumElements(0, s64, 2)
      .clampMaxNumElements(0, p0, 2)
      .lowerIfMemSizeNotByteSizePow2()
      ...
```

https://github.com/llvm/llvm-project/pull/85042