[llvm] [IA][RISCV] Add support for vp.load/vp.store with shufflevector (PR #135445)

[Min-Yih Hsu via llvm-commits]

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@@ -249,11 +249,48 @@ static bool isReInterleaveMask(ShuffleVectorInst *SVI, unsigned &Factor,
   return false;
 }
 
+/// Return true if it's a non-all-zeros, interleaving mask. For instance,
+/// 111000111000 is interleaved from three 1010 masks.
+/// \p SubMask returns the mask of individual lane.
+static bool isInterleavedConstantMask(unsigned Factor, ConstantVector *Mask,
+                                      SmallVectorImpl<Constant *> &LaneMask) {
+  unsigned LaneMaskLen = LaneMask.size();
+  if (auto *Splat = Mask->getSplatValue()) {
+    // All-zeros mask.
+    if (Splat->isZeroValue())
+      return false;
+    // All-ones mask.
+    std::fill(LaneMask.begin(), LaneMask.end(),
+              ConstantInt::getTrue(Mask->getContext()));
+  } else {
+    for (unsigned Idx = 0U, N = LaneMaskLen * Factor; Idx < N; ++Idx) {
+      Constant *Ref = Mask->getAggregateElement((Idx / Factor) * Factor);
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mshockwave wrote:

Fixed.

https://github.com/llvm/llvm-project/pull/135445