[mlir][linalg] Fix the semantic use of a flag (#90081)

`useInBoundsInsteadOfMasking` was doing the opposite i.e., when set to
true; was updating the mask instead of updating the inBounds.

mlir/include/mlir/Dialect/Vector/Utils/VectorUtils.h

@@ -194,7 +194,7 @@ bool isLinearizableVector(VectorType type);
 /// for each dimension of the passed in tensor.
 Value createReadOrMaskedRead(OpBuilder &builder, Location loc, Value source,
                              ArrayRef<int64_t> readShape, Value padValue,
-                             bool useInBoundsInsteadOfMasking = true);
+                             bool useInBoundsInsteadOfMasking);
 
 /// Returns success if `inputVectorSizes` is a valid masking configuraion for
 /// given `shape`, i.e., it meets:

mlir/lib/Dialect/Linalg/Transforms/Vectorization.cpp

@@ -1499,11 +1499,11 @@ vectorizeAsTensorPackOp(RewriterBase &rewriter, tensor::PackOp packOp,
   // If the input vector sizes are not provided, then the vector sizes are
   // determined by the result tensor shape. In case the vector sizes aren't
   // provided, we update the inBounds attribute instead of masking.
-  bool useInBoundsInsteadOfMasking = true;
+  bool useInBoundsInsteadOfMasking = false;
   if (inputVectorSizes.empty()) {
     ArrayRef<int64_t> resultTensorShape = packOp.getDestType().getShape();
     inputVectorSizes = resultTensorShape.take_front(packOp.getSourceRank());
-    useInBoundsInsteadOfMasking = false;
+    useInBoundsInsteadOfMasking = true;
   }
 
   // Create masked TransferReadOp.
@@ -1612,7 +1612,8 @@ vectorizeAsTensorUnpackOp(RewriterBase &rewriter, tensor::UnPackOp unpackOp,
   // to shape of source, then a mask is necessary.
   Value readResult = vector::createReadOrMaskedRead(
       rewriter, loc, unpackOp.getSource(),
-      ArrayRef<int64_t>(readMaskShape.begin(), readMaskShape.end()), padValue);
+      ArrayRef<int64_t>(readMaskShape.begin(), readMaskShape.end()), padValue,
+      /*useInBoundsInsteadOfMasking=*/false);
 
   PackingMetadata packMetadata;
   SmallVector<int64_t> lastDimToInsertPosPerm =
@@ -1669,7 +1670,8 @@ vectorizeAsTensorPadOp(RewriterBase &rewriter, tensor::PadOp padOp,
   (void)status; // prevent unused variable warning on non-assert builds
   assert(succeeded(status) && "failed to reify result shapes");
   auto maskedRead = vector::createReadOrMaskedRead(
-      rewriter, loc, padOp.getSource(), inputVectorSizes, padValue);
+      rewriter, loc, padOp.getSource(), inputVectorSizes, padValue,
+      /*useInBoundsInsteadOfMasking=*/false);
   Operation *write = createWriteOrMaskedWrite(
       rewriter, loc, maskedRead, reifiedReturnShapes[0], inputVectorSizes);
   newResults.push_back(write->getResult(0));

mlir/lib/Dialect/Vector/Utils/VectorUtils.cpp

@@ -345,7 +345,7 @@ Value vector::createReadOrMaskedRead(OpBuilder &builder, Location loc,
   int64_t readRank = readShape.size();
   auto zero = builder.create<arith::ConstantIndexOp>(loc, 0);
   SmallVector<bool> inBoundsVal(readRank, true);
-  if (!useInBoundsInsteadOfMasking) {
+  if (useInBoundsInsteadOfMasking) {
     // Update the inBounds attribute.
     for (unsigned i = 0; i < readRank; i++)
       inBoundsVal[i] = (sourceShape[i] == readShape[i]) &&
@@ -359,7 +359,7 @@ Value vector::createReadOrMaskedRead(OpBuilder &builder, Location loc,
       /*padding=*/padValue,
       /*inBounds=*/inBoundsVal);
 
-  if (llvm::equal(readShape, sourceShape) || !useInBoundsInsteadOfMasking)
+  if (llvm::equal(readShape, sourceShape) || useInBoundsInsteadOfMasking)
     return transferReadOp;
   SmallVector<OpFoldResult> mixedSourceDims =
       tensor::getMixedSizes(builder, loc, source);