diff --git a/mlir/lib/Dialect/SPIRV/Transforms/UnifyAliasedResourcePass.cpp b/mlir/lib/Dialect/SPIRV/Transforms/UnifyAliasedResourcePass.cpp
--- a/mlir/lib/Dialect/SPIRV/Transforms/UnifyAliasedResourcePass.cpp
+++ b/mlir/lib/Dialect/SPIRV/Transforms/UnifyAliasedResourcePass.cpp
@@ -455,12 +455,14 @@
                                                       indices.back(), oneValue);
       auto componentAcOp =
           rewriter.create<spirv::AccessChainOp>(loc, acOp.base_ptr(), indices);
+      // Assuming little endian, this reads lower-ordered bits of the number to
+      // lower-numbered components of the vector.
       components.push_back(rewriter.create<spirv::LoadOp>(loc, componentAcOp));
     }
-    std::reverse(components.begin(), components.end()); // For little endian..
 
     // Create a vector of the components and then cast back to the larger
-    // bitwidth element type.
+    // bitwidth element type. For spv.bitcast, the lower-numbered components of
+    // the vector map to lower-ordered bits of the larger bitwidth element type.
     auto vectorType = VectorType::get({ratio}, dstElemType);
     Value vectorValue = rewriter.create<spirv::CompositeConstructOp>(
         loc, vectorType, components);
diff --git a/mlir/test/Dialect/SPIRV/Transforms/unify-aliased-resource.mlir b/mlir/test/Dialect/SPIRV/Transforms/unify-aliased-resource.mlir
--- a/mlir/test/Dialect/SPIRV/Transforms/unify-aliased-resource.mlir
+++ b/mlir/test/Dialect/SPIRV/Transforms/unify-aliased-resource.mlir
@@ -251,7 +251,7 @@
 //     CHECK:   %[[AC1:.+]] = spv.AccessChain %[[ADDR]][%[[ZERO]], %[[ADD]]]
 //     CHECK:   %[[LOAD1:.+]] = spv.Load "StorageBuffer" %[[AC1]] : f32
 
-//     CHECK:   %[[CC:.+]] = spv.CompositeConstruct %[[LOAD1]], %[[LOAD0]]
+//     CHECK:   %[[CC:.+]] = spv.CompositeConstruct %[[LOAD0]], %[[LOAD1]]
 //     CHECK:   %[[CAST:.+]] = spv.Bitcast %[[CC]] : vector<2xf32> to i64
 //     CHECK:   spv.ReturnValue %[[CAST]]