[llvm] [RISCV] Decompose single source shuffles (without exact VLEN) (PR #126108)

[Craig Topper via llvm-commits]

================
@@ -5350,6 +5350,12 @@ static bool isLocalRepeatingShuffle(ArrayRef<int> Mask, int Span) {
   return true;
 }
 
+/// Is this mask only using elements from the first span of the input?
+static bool isLowSourceShuffle(ArrayRef<int> Mask, int Span) {
+  return !any_of(Mask,
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topperc wrote:

Use `none_of` instead of `!any_of` or invert the lambda and use all_of.

```
  return all_of(Mask,
                [&](const auto &Idx) { return Idx == -1 || Idx < Span; });
```

https://github.com/llvm/llvm-project/pull/126108