diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassLayoutBuilder.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassLayoutBuilder.kt
index b1f3f563558..a0bfcbdf6c6 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassLayoutBuilder.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/descriptors/ClassLayoutBuilder.kt
@@ -5,10 +5,12 @@
 
 package org.jetbrains.kotlin.backend.konan.descriptors
 
+import llvm.LLVMStoreSizeOfType
 import org.jetbrains.kotlin.backend.common.ir.simpleFunctions
 import org.jetbrains.kotlin.backend.konan.*
 import org.jetbrains.kotlin.backend.konan.ir.*
 import org.jetbrains.kotlin.backend.konan.llvm.functionName
+import org.jetbrains.kotlin.backend.konan.llvm.llvmType
 import org.jetbrains.kotlin.backend.konan.llvm.localHash
 import org.jetbrains.kotlin.backend.konan.lower.bridgeTarget
 import org.jetbrains.kotlin.descriptors.Modality
@@ -439,7 +441,7 @@ internal class ClassLayoutBuilder(val irClass: IrClass, val context: Context) {
         if (irClass.hasAnnotation(FqName.fromSegments(listOf("kotlin", "native", "internal", "NoReorderFields"))))
             return fields
 
-        return fields.sortedBy { it.fqNameForIrSerialization.localHash.value }
+        return fields.sortedByDescending{ LLVMStoreSizeOfType(context.llvm.runtime.targetData, it.type.llvmType(context)) }
     }
 
     private val IrClass.sortedOverridableOrOverridingMethods: List<IrSimpleFunction>
@@ -451,4 +453,4 @@ internal class ClassLayoutBuilder(val irClass: IrClass, val context: Context) {
     private val functionIds = mutableMapOf<IrFunction, Long>()
 
     private val IrFunction.uniqueId get() = functionIds.getOrPut(this) { functionName.localHash.value }
-}
\ No newline at end of file
+}
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/ContextUtils.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/ContextUtils.kt
index 0cdaf77f1a8..340849ddada 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/ContextUtils.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/ContextUtils.kt
@@ -554,6 +554,7 @@ internal class Llvm(val context: Context, val llvmModule: LLVMModuleRef) {
     val llvmInt64 = int64Type
     val llvmFloat = floatType
     val llvmDouble = doubleType
+    val llvmVector128 = vector128Type
 }
 
 class IrStaticInitializer(val file: IrFile, val initializer: LLVMValueRef)
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/DebugUtils.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/DebugUtils.kt
index 1a5c03400c9..ec08152c24a 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/DebugUtils.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/DebugUtils.kt
@@ -219,6 +219,7 @@ internal fun IrType.llvmType(context:Context): LLVMTypeRef = context.debugInfo.l
         PrimitiveBinaryType.LONG -> context.llvm.llvmInt64
         PrimitiveBinaryType.FLOAT -> context.llvm.llvmFloat
         PrimitiveBinaryType.DOUBLE -> context.llvm.llvmDouble
+        PrimitiveBinaryType.VECTOR128 -> context.llvm.llvmVector128
         else -> context.debugInfo.otherLlvmType
     }
 }