[Mlir-commits] [mlir] [mlir][memref] Fix emulate narrow types for strided memref offset (PR #68181)

[llvmlistbot at llvm.org]

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@@ -209,6 +209,74 @@ struct ConvertMemRefLoad final : OpConversionPattern<memref::LoadOp> {
     return success();
   }
 };
+
+//===----------------------------------------------------------------------===//
+// ConvertMemRefSubview
+//===----------------------------------------------------------------------===//
+
+struct ConvertMemRefSubview final : OpConversionPattern<memref::SubViewOp> {
+  using OpConversionPattern::OpConversionPattern;
+
+  LogicalResult
+  matchAndRewrite(memref::SubViewOp op, OpAdaptor adaptor,
+                  ConversionPatternRewriter &rewriter) const override {
+    auto convertedType =
+        cast<MemRefType>(getTypeConverter()->convertType(op.getSourceType()));
+    auto convertedElementType = convertedType.getElementType();
+    auto oldElementType = op.getSourceType().getElementType();
+    int srcBits = oldElementType.getIntOrFloatBitWidth();
+    int dstBits = convertedElementType.getIntOrFloatBitWidth();
+    if (dstBits % srcBits != 0) {
+      return rewriter.notifyMatchFailure(
+          op, "only dstBits % srcBits == 0 supported");
+    }
+
+    MemRefType newTy =
+        cast<MemRefType>(getTypeConverter()->convertType(op.getType()));
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MaheshRavishankar wrote:

Use `dyn_cast`. Also you can probably just check this on the `op.getType()` directly.

https://github.com/llvm/llvm-project/pull/68181