[mlir][vector] Fix parser of vector.transfer_read

mlir/lib/Dialect/Vector/IR/VectorOps.cpp

@@ -164,6 +164,10 @@ AffineMap mlir::vector::getTransferMinorIdentityMap(ShapedType shapedType,
     return AffineMap::get(
         /*numDims=*/0, /*numSymbols=*/0,
         getAffineConstantExpr(0, shapedType.getContext()));
+  if (shapedType.getRank() < vectorType.getRank() - elementVectorRank) {
+    return AffineMap(); // Not enough dimensions in the shaped type to form a
+                        // minor identity map.
+  }
   return AffineMap::getMinorIdentityMap(
       shapedType.getRank(), vectorType.getRank() - elementVectorRank,
       shapedType.getContext());
@@ -4260,6 +4264,10 @@ ParseResult TransferReadOp::parse(OpAsmParser &parser, OperationState &result) {
   AffineMap permMap;
   if (!permMapAttr) {
     permMap = getTransferMinorIdentityMap(shapedType, vectorType);
+    if (!permMap) {
+      return parser.emitError(
+          typesLoc, "failed to create minor identity permutation map");
+    }
     result.attributes.set(permMapAttrName, AffineMapAttr::get(permMap));
   } else {
     permMap = llvm::cast<AffineMapAttr>(permMapAttr).getValue();

mlir/test/Dialect/Vector/invalid.mlir

@@ -525,6 +525,15 @@ func.func @test_vector.transfer_read(%arg0: memref<?x?xvector<2x3xf32>>) {
 
 // -----
 
+func.func @test_vector.transfer_read(%arg1: memref<?xindex>) -> vector<3x4xi32> {
+  %c3_i32 = arith.constant 3 : i32
+  // expected-error@+1 {{failed to create minor identity permutation map}}
+  %0 = vector.transfer_read %arg1[%c3_i32, %c3_i32], %c3_i32 : memref<?xindex>, vector<3x4xi32>
+  return %0 : vector<3x4xi32>
+}
+
+// -----
+
 func.func @test_vector.transfer_write(%arg0: memref<?x?xf32>) {
   %c3 = arith.constant 3 : index
   %cst = arith.constant 3.0 : f32