[Mlir-commits] [mlir] [MLIR] VectorEmulateNarrowType to support loading of unaligned vectors (PR #113411)

[Han-Chung Wang]

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@@ -102,6 +124,33 @@ static FailureOr<Operation *> getCompressedMaskOp(OpBuilder &rewriter,
   return newMask;
 }
 
+static std::optional<int64_t>
+getFrontPaddingSize(ConversionPatternRewriter &rewriter, Location loc,
+                    const memref::LinearizedMemRefInfo linearizedInfo,
+                    bool isUnalignedEmulation) {
+  if (!isUnalignedEmulation)
+    return 0;
+  auto foldedFrontPaddingSize = getValueOrCreateConstantIndexOp(
+      rewriter, loc, linearizedInfo.frontPaddingSize);
+  // try to fold the front padding size into a constant
+  if (auto frontPadding = dyn_cast_or_null<arith::ConstantIndexOp>(
+          foldedFrontPaddingSize.getDefiningOp())) {
+    return frontPadding.value();
+  }
+  return std::nullopt;
----------------
hanhanW wrote:

Here is the method that you're looking for: `getConstantIntValue`.

https://github.com/llvm/llvm-project/blob/564fd62aedfde6358baa1776a2de975b45bc7778/mlir/include/mlir/Dialect/Utils/StaticValueUtils.h#L87-L88

https://github.com/llvm/llvm-project/pull/113411