[llvm] [mlir] [mlir][spirv] Add vector.interleave to spirv.VectorShuffle conversion (PR #93240)

[Jakub Kuderski via llvm-commits]

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@@ -578,6 +578,49 @@ struct VectorShuffleOpConvert final
   }
 };
 
+struct VectorInterleaveOpConvert final
+    : public OpConversionPattern<vector::InterleaveOp> {
+  using OpConversionPattern::OpConversionPattern;
+
+  LogicalResult
+  matchAndRewrite(vector::InterleaveOp interleaveOp, OpAdaptor adaptor,
+                  ConversionPatternRewriter &rewriter) const override {
+    // Check the result vector type
+    VectorType oldResultType = interleaveOp.getResultVectorType();
+    Type newResultType = getTypeConverter()->convertType(oldResultType);
+    if (!newResultType)
+      return rewriter.notifyMatchFailure(interleaveOp,
+                                         "unsupported result vector type");
+
+    // Interleave the indices
+    VectorType sourceType = interleaveOp.getSourceVectorType();
+    int n = sourceType.getNumElements();
+
+    // Input vectors of size 1 are converted to scalars by the type converter.
+    // We cannot use spirv::VectorShuffleOp directly in this case, and need to
+    // use spirv::CompositeConstructOp.
+    if (n == 1) {
+      SmallVector<Value> newOperands(2);
+      newOperands[0] = adaptor.getLhs();
+      newOperands[1] = adaptor.getRhs();
+      rewriter.replaceOpWithNewOp<spirv::CompositeConstructOp>(
+          interleaveOp, newResultType, newOperands);
+      return success();
+    }
+
+    auto seq = llvm::seq<int64_t>(2 * n);
+    auto indices = llvm::to_vector(
+        llvm::map_range(seq, [n](int i) { return (i % 2 ? n : 0) + i / 2; }));
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kuhar wrote:

We can use `llvm::map_to_vector` here

https://github.com/llvm/llvm-project/pull/93240