[llvm-branch-commits] [llvm] [SelectionDAG] Legalize <1 x T> vector types for atomic load (PR #120385)

[James Y Knight via llvm-branch-commits]

jyknight wrote:

Running `llc -mtriple=x86_64-linux-gnu` on
```
define <2 x i32> @atomic_vec2_i32(ptr %x) #0 {
  %ret = load atomic <2 x i32>, ptr %x acquire, align 64
  ret <2 x i32> %ret
}
```
crashes with:
```
WidenVectorResult #0: t3: v2i32,ch = AtomicLoad<(load acquire (s64) from %ir.x, align 64)> t0, t2
LLVM ERROR: Do not know how to widen the result of this operator!
```

https://github.com/llvm/llvm-project/pull/120385