diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/utils/kotlinTypeBasedUtils.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/utils/kotlinTypeBasedUtils.kt
index c59ee639a8b..3372f4475b4 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/utils/kotlinTypeBasedUtils.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/utils/kotlinTypeBasedUtils.kt
@@ -6,26 +6,10 @@
 package org.jetbrains.kotlin.backend.common.utils
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.types.IrType
-import org.jetbrains.kotlin.ir.types.toIrType
 import org.jetbrains.kotlin.ir.types.toKotlinType
-import org.jetbrains.kotlin.ir.util.SymbolTable
-import org.jetbrains.kotlin.resolve.DescriptorUtils
-import org.jetbrains.kotlin.types.CommonSupertypes
-import org.jetbrains.kotlin.types.typeUtil.isSubtypeOf
 
 // TODO: implement pure Ir-based function (see IrTypeUtils.kt)
 
 @Deprecated("Use pure Ir helper")
-fun IrType.getPrimitiveArrayElementType() = KotlinBuiltIns.getPrimitiveArrayElementType(toKotlinType())
-
-@Deprecated("Use pure Ir helper")
-fun List<IrType>.commonSupertype(symbolTable: SymbolTable) =
-    CommonSupertypes.commonSupertype(map(IrType::toKotlinType)).toIrType(symbolTable)!!
-
-@Deprecated("Use pure Ir helper")
-fun IrType.isSubtypeOf(superType: IrType) = toKotlinType().isSubtypeOf(superType.toKotlinType())
-
-@Deprecated("Use pure Ir helper")
-fun IrType.isSubtypeOfClass(superClass: IrClassSymbol) = DescriptorUtils.isSubtypeOfClass(toKotlinType(), superClass.descriptor)
+fun IrType.getPrimitiveArrayElementType() = KotlinBuiltIns.getPrimitiveArrayElementType(toKotlinType())
\ No newline at end of file