[llvm] [RISCV] Recognize VLA shift pairs from shuffle masks (PR #127710)

[Craig Topper via llvm-commits]

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@@ -4563,6 +4563,49 @@ static bool isInterleaveShuffle(ArrayRef<int> Mask, MVT VT, int &EvenSrc,
   return ((EvenSrc % HalfNumElts) == 0) && ((OddSrc % HalfNumElts) == 0);
 }
 
+/// Is this mask representing a masked combination of two slides?
+static bool isMaskedSlidePair(ArrayRef<int> Mask,
+                              std::pair<int, int> SrcInfo[2]) {
+  int NumElts = Mask.size();
+  int SIGNAL_VAL = NumElts * 2;
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topperc wrote:

Can we rename this to match variable naming rules?

https://github.com/llvm/llvm-project/pull/127710