diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt
index 94e42601ae6..469669e4460 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/ConversionUtils.kt
@@ -51,6 +51,7 @@ import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl
+import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.name.StandardClassIds
@@ -495,6 +496,15 @@ internal fun FirReference.statementOrigin(): IrStatementOrigin? = when (this) {
             source?.kind is KtFakeSourceElementKind.DesugaredComponentFunctionCall ->
                 IrStatementOrigin.COMPONENT_N.withIndex(name.asString().removePrefix(DATA_CLASS_COMPONENT_PREFIX).toInt())
 
+            source?.kind is KtFakeSourceElementKind.DesugaredCompoundAssignment -> when (name) {
+                OperatorNameConventions.PLUS_ASSIGN -> IrStatementOrigin.PLUSEQ
+                OperatorNameConventions.MINUS_ASSIGN -> IrStatementOrigin.MINUSEQ
+                OperatorNameConventions.TIMES_ASSIGN -> IrStatementOrigin.MULTEQ
+                OperatorNameConventions.DIV_ASSIGN -> IrStatementOrigin.DIVEQ
+                OperatorNameConventions.MOD_ASSIGN, OperatorNameConventions.REM_ASSIGN -> IrStatementOrigin.PERCEQ
+                else -> null
+            }
+
             else ->
                 null
         }
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt
index 344d9c8bae1..4e368c4e28a 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/arrayAccessCompositeOperators.fir.ir.txt
@@ -177,7 +177,7 @@ FILE fqName:<root> fileName:/arrayAccessCompositeOperators.kt
           FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> ($receiver:kotlin.Int) returnType:kotlin.Unit
             $receiver: VALUE_PARAMETER name:$this$with type:kotlin.Int
             BLOCK_BODY
-              CALL 'public final fun plusAssign ($context_receiver_0: kotlin.Int, other: <root>.MyContainer): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+              CALL 'public final fun plusAssign ($context_receiver_0: kotlin.Int, other: <root>.MyContainer): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PLUSEQ
                 $receiver: GET_VAR 'var myContainer: <root>.MyContainer declared in <root>.box' type=<root>.MyContainer origin=null
                 $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                 other: CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) declared in <root>.MyContainer' type=<root>.MyContainer origin=null
diff --git a/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt b/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt
index e71366a7211..1b38af09a45 100644
--- a/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/contextReceivers/compoundAssignmentOperators.fir.ir.txt
@@ -260,7 +260,7 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
           FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> ($receiver:kotlin.Int) returnType:kotlin.Unit
             $receiver: VALUE_PARAMETER name:$this$with type:kotlin.Int
             BLOCK_BODY
-              CALL 'public final fun plusAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+              CALL 'public final fun plusAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PLUSEQ
                 $receiver: GET_VAR 'val result: <root>.Result declared in <root>.box' type=<root>.Result origin=null
                 $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                 other: CALL 'public final fun plus ($context_receiver_0: kotlin.Int, other: <root>.Result): <root>.Result declared in <root>' type=<root>.Result origin=PLUS
@@ -269,7 +269,7 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
                   $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                   other: CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) declared in <root>.Result' type=<root>.Result origin=null
                     i: CONST Int type=kotlin.Int value=1
-              CALL 'public final fun minusAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+              CALL 'public final fun minusAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=MINUSEQ
                 $receiver: GET_VAR 'val result: <root>.Result declared in <root>.box' type=<root>.Result origin=null
                 $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                 other: CALL 'public final fun minus ($context_receiver_0: kotlin.Int, other: <root>.Result): <root>.Result declared in <root>' type=<root>.Result origin=MINUS
@@ -278,7 +278,7 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
                   $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                   other: CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) declared in <root>.Result' type=<root>.Result origin=null
                     i: CONST Int type=kotlin.Int value=0
-              CALL 'public final fun timesAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+              CALL 'public final fun timesAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=MULTEQ
                 $receiver: GET_VAR 'val result: <root>.Result declared in <root>.box' type=<root>.Result origin=null
                 $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                 other: CALL 'public final fun times ($context_receiver_0: kotlin.Int, other: <root>.Result): <root>.Result declared in <root>' type=<root>.Result origin=MUL
@@ -287,7 +287,7 @@ FILE fqName:<root> fileName:/compoundAssignmentOperators.kt
                   $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                   other: CONSTRUCTOR_CALL 'public constructor <init> (i: kotlin.Int) declared in <root>.Result' type=<root>.Result origin=null
                     i: CONST Int type=kotlin.Int value=2
-              CALL 'public final fun divAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+              CALL 'public final fun divAssign ($context_receiver_0: kotlin.Int, other: <root>.Result): kotlin.Unit declared in <root>' type=kotlin.Unit origin=DIVEQ
                 $receiver: GET_VAR 'val result: <root>.Result declared in <root>.box' type=<root>.Result origin=null
                 $context_receiver_0: GET_VAR '$this$with: kotlin.Int declared in <root>.box.<anonymous>' type=kotlin.Int origin=null
                 other: CALL 'public final fun div ($context_receiver_0: kotlin.Int, other: <root>.Result): <root>.Result declared in <root>' type=<root>.Result origin=DIV
diff --git a/compiler/testData/ir/irText/expressions/augmentedAssignment2.fir.ir.txt b/compiler/testData/ir/irText/expressions/augmentedAssignment2.fir.ir.txt
index 291131f9098..f21dd559feb 100644
--- a/compiler/testData/ir/irText/expressions/augmentedAssignment2.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/augmentedAssignment2.fir.ir.txt
@@ -51,35 +51,35 @@ FILE fqName:<root> fileName:/augmentedAssignment2.kt
     BLOCK_BODY
       VAR name:a type:<root>.A [val]
         CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.A' type=<root>.A origin=null
-      CALL 'public final fun plusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PLUSEQ
         $receiver: GET_VAR 'val a: <root>.A declared in <root>.testVariable' type=<root>.A origin=null
         s: CONST String type=kotlin.String value="+="
-      CALL 'public final fun minusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun minusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=MINUSEQ
         $receiver: GET_VAR 'val a: <root>.A declared in <root>.testVariable' type=<root>.A origin=null
         s: CONST String type=kotlin.String value="-="
-      CALL 'public final fun timesAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun timesAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=MULTEQ
         $receiver: GET_VAR 'val a: <root>.A declared in <root>.testVariable' type=<root>.A origin=null
         s: CONST String type=kotlin.String value="*="
-      CALL 'public final fun divAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun divAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=DIVEQ
         $receiver: GET_VAR 'val a: <root>.A declared in <root>.testVariable' type=<root>.A origin=null
         s: CONST String type=kotlin.String value="/="
-      CALL 'public final fun remAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun remAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PERCEQ
         $receiver: GET_VAR 'val a: <root>.A declared in <root>.testVariable' type=<root>.A origin=null
         s: CONST String type=kotlin.String value="*="
   FUN name:testProperty visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
-      CALL 'public final fun plusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PLUSEQ
         $receiver: CALL 'public final fun <get-p> (): <root>.A declared in <root>' type=<root>.A origin=GET_PROPERTY
         s: CONST String type=kotlin.String value="+="
-      CALL 'public final fun minusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun minusAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=MINUSEQ
         $receiver: CALL 'public final fun <get-p> (): <root>.A declared in <root>' type=<root>.A origin=GET_PROPERTY
         s: CONST String type=kotlin.String value="-="
-      CALL 'public final fun timesAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun timesAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=MULTEQ
         $receiver: CALL 'public final fun <get-p> (): <root>.A declared in <root>' type=<root>.A origin=GET_PROPERTY
         s: CONST String type=kotlin.String value="*="
-      CALL 'public final fun divAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun divAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=DIVEQ
         $receiver: CALL 'public final fun <get-p> (): <root>.A declared in <root>' type=<root>.A origin=GET_PROPERTY
         s: CONST String type=kotlin.String value="/="
-      CALL 'public final fun remAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun remAssign (s: kotlin.String): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PERCEQ
         $receiver: CALL 'public final fun <get-p> (): <root>.A declared in <root>' type=<root>.A origin=GET_PROPERTY
         s: CONST String type=kotlin.String value="%="
diff --git a/compiler/testData/ir/irText/expressions/augmentedAssignmentWithExpression.fir.ir.txt b/compiler/testData/ir/irText/expressions/augmentedAssignmentWithExpression.fir.ir.txt
index 4e335fd60d4..470f0dfd1bc 100644
--- a/compiler/testData/ir/irText/expressions/augmentedAssignmentWithExpression.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/augmentedAssignmentWithExpression.fir.ir.txt
@@ -12,7 +12,7 @@ FILE fqName:<root> fileName:/augmentedAssignmentWithExpression.kt
     FUN name:test1 visibility:public modality:FINAL <> ($this:<root>.Host) returnType:kotlin.Unit
       $this: VALUE_PARAMETER name:<this> type:<root>.Host
       BLOCK_BODY
-        CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=null
+        CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=PLUSEQ
           $this: GET_VAR '<this>: <root>.Host declared in <root>.Host.test1' type=<root>.Host origin=null
           x: CONST Int type=kotlin.Int value=1
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
@@ -35,18 +35,18 @@ FILE fqName:<root> fileName:/augmentedAssignmentWithExpression.kt
   FUN name:test2 visibility:public modality:FINAL <> ($receiver:<root>.Host) returnType:kotlin.Unit
     $receiver: VALUE_PARAMETER name:<this> type:<root>.Host
     BLOCK_BODY
-      CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=PLUSEQ
         $this: GET_VAR '<this>: <root>.Host declared in <root>.test2' type=<root>.Host origin=null
         x: CONST Int type=kotlin.Int value=1
   FUN name:test3 visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
-      CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=PLUSEQ
         $this: CALL 'public final fun foo (): <root>.Host declared in <root>' type=<root>.Host origin=null
         x: CONST Int type=kotlin.Int value=1
   FUN name:test4 visibility:public modality:FINAL <> (a:kotlin.Function0<<root>.Host>) returnType:kotlin.Unit
     VALUE_PARAMETER name:a index:0 type:kotlin.Function0<<root>.Host>
     BLOCK_BODY
-      CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=PLUSEQ
         $this: CALL 'public abstract fun invoke (): R of kotlin.Function0 declared in kotlin.Function0' type=<root>.Host origin=INVOKE
           $this: GET_VAR 'a: kotlin.Function0<<root>.Host> declared in <root>.test4' type=kotlin.Function0<<root>.Host> origin=VARIABLE_AS_FUNCTION
         x: CONST Int type=kotlin.Int value=1
diff --git a/compiler/testData/ir/irText/expressions/complexAugmentedAssignment.fir.ir.txt b/compiler/testData/ir/irText/expressions/complexAugmentedAssignment.fir.ir.txt
index 546da584309..bb40aca467f 100644
--- a/compiler/testData/ir/irText/expressions/complexAugmentedAssignment.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/complexAugmentedAssignment.fir.ir.txt
@@ -247,7 +247,7 @@ FILE fqName:<root> fileName:/complexAugmentedAssignment.kt
     $receiver: VALUE_PARAMETER name:<this> type:<root>.Host
     VALUE_PARAMETER name:v index:0 type:<root>.B
     BLOCK_BODY
-      CALL 'public final fun plusAssign (b: <root>.B): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (b: <root>.B): kotlin.Unit declared in <root>.Host' type=kotlin.Unit origin=PLUSEQ
         $this: GET_VAR '<this>: <root>.Host declared in <root>.test3' type=<root>.Host origin=null
         $receiver: GET_VAR 'v: <root>.B declared in <root>.test3' type=<root>.B origin=null
         b: CONSTRUCTOR_CALL 'public constructor <init> (s: kotlin.Int) declared in <root>.B' type=<root>.B origin=null
diff --git a/compiler/testData/ir/irText/expressions/kt16904.fir.ir.txt b/compiler/testData/ir/irText/expressions/kt16904.fir.ir.txt
index 786549e9653..398bf685f95 100644
--- a/compiler/testData/ir/irText/expressions/kt16904.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/kt16904.fir.ir.txt
@@ -77,7 +77,7 @@ FILE fqName:<root> fileName:/kt16904.kt
       BLOCK_BODY
         DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in <root>.A'
         INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:Test1 modality:FINAL visibility:public superTypes:[<root>.A]'
-        CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.B' type=kotlin.Unit origin=null
+        CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit declared in <root>.B' type=kotlin.Unit origin=PLUSEQ
           $this: CALL 'public final fun <get-x> (): <root>.B declared in <root>.Test1' type=<root>.B origin=GET_PROPERTY
             $this: GET_VAR '<this>: <root>.Test1 declared in <root>.Test1' type=<root>.Test1 origin=null
           x: CONST Int type=kotlin.Int value=42
diff --git a/compiler/testData/ir/irText/expressions/kt30020.fir.ir.txt b/compiler/testData/ir/irText/expressions/kt30020.fir.ir.txt
index 71062355a41..14bc2310c39 100644
--- a/compiler/testData/ir/irText/expressions/kt30020.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/kt30020.fir.ir.txt
@@ -24,29 +24,29 @@ FILE fqName:<root> fileName:/kt30020.kt
     VALUE_PARAMETER name:x index:0 type:<root>.X
     VALUE_PARAMETER name:nx index:1 type:<root>.X?
     BLOCK_BODY
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any> origin=GET_PROPERTY
           $this: GET_VAR 'x: <root>.X declared in <root>.test' type=<root>.X origin=null
         element: CONST Int type=kotlin.Int value=1
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: CALL 'public abstract fun f (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any> origin=null
           $this: GET_VAR 'x: <root>.X declared in <root>.test' type=<root>.X origin=null
         element: CONST Int type=kotlin.Int value=2
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: TYPE_OP type=kotlin.collections.MutableList<kotlin.Int> origin=CAST typeOperand=kotlin.collections.MutableList<kotlin.Int>
           CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any> origin=GET_PROPERTY
             $this: GET_VAR 'x: <root>.X declared in <root>.test' type=<root>.X origin=null
         element: CONST Int type=kotlin.Int value=3
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: TYPE_OP type=kotlin.collections.MutableList<kotlin.Int> origin=CAST typeOperand=kotlin.collections.MutableList<kotlin.Int>
           CALL 'public abstract fun f (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any> origin=null
             $this: GET_VAR 'x: <root>.X declared in <root>.test' type=<root>.X origin=null
         element: CONST Int type=kotlin.Int value=4
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: CALL 'public final fun CHECK_NOT_NULL <T0> (arg0: T0 of kotlin.internal.ir.CHECK_NOT_NULL?): {T0 of kotlin.internal.ir.CHECK_NOT_NULL & Any} declared in kotlin.internal.ir' type=kotlin.collections.MutableList<kotlin.Any> origin=EXCLEXCL
           <T0>: kotlin.collections.MutableList<kotlin.Any>
@@ -64,7 +64,7 @@ FILE fqName:<root> fileName:/kt30020.kt
                 then: CALL 'public abstract fun <get-xs> (): kotlin.collections.MutableList<kotlin.Any> declared in <root>.X' type=kotlin.collections.MutableList<kotlin.Any> origin=GET_PROPERTY
                   $this: GET_VAR 'val tmp_0: <root>.X? declared in <root>.test' type=<root>.X? origin=null
         element: CONST Int type=kotlin.Int value=5
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: CALL 'public final fun CHECK_NOT_NULL <T0> (arg0: T0 of kotlin.internal.ir.CHECK_NOT_NULL?): {T0 of kotlin.internal.ir.CHECK_NOT_NULL & Any} declared in kotlin.internal.ir' type=kotlin.collections.MutableList<kotlin.Any> origin=EXCLEXCL
           <T0>: kotlin.collections.MutableList<kotlin.Any>
@@ -85,7 +85,7 @@ FILE fqName:<root> fileName:/kt30020.kt
   FUN name:testExtensionReceiver visibility:public modality:FINAL <> ($receiver:kotlin.collections.MutableList<kotlin.Any>) returnType:kotlin.Unit
     $receiver: VALUE_PARAMETER name:<this> type:kotlin.collections.MutableList<kotlin.Any>
     BLOCK_BODY
-      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
         <T>: kotlin.Int
         $receiver: GET_VAR '<this>: kotlin.collections.MutableList<kotlin.Any> declared in <root>.testExtensionReceiver' type=kotlin.collections.MutableList<kotlin.Any> origin=null
         element: CONST Int type=kotlin.Int value=100
@@ -98,7 +98,7 @@ FILE fqName:<root> fileName:/kt30020.kt
     FUN name:testExplicitThis visibility:public modality:FINAL <> ($this:<root>.AML) returnType:kotlin.Unit
       $this: VALUE_PARAMETER name:<this> type:<root>.AML
       BLOCK_BODY
-        CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+        CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
           <T>: kotlin.Int
           $receiver: GET_VAR '<this>: <root>.AML declared in <root>.AML.testExplicitThis' type=<root>.AML origin=null
           element: CONST Int type=kotlin.Int value=200
@@ -112,7 +112,7 @@ FILE fqName:<root> fileName:/kt30020.kt
       FUN name:testOuterThis visibility:public modality:FINAL <> ($this:<root>.AML.Inner) returnType:kotlin.Unit
         $this: VALUE_PARAMETER name:<this> type:<root>.AML.Inner
         BLOCK_BODY
-          CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=null
+          CALL 'public final fun plusAssign <T> (element: T of kotlin.collections.plusAssign): kotlin.Unit declared in kotlin.collections' type=kotlin.Unit origin=PLUSEQ
             <T>: kotlin.Int
             $receiver: GET_VAR '<this>: <root>.AML declared in <root>.AML' type=<root>.AML origin=null
             element: CONST Int type=kotlin.Int value=300
diff --git a/compiler/testData/ir/irText/expressions/kt45022.fir.ir.txt b/compiler/testData/ir/irText/expressions/kt45022.fir.ir.txt
deleted file mode 100644
index 417dfce921c..00000000000
--- a/compiler/testData/ir/irText/expressions/kt45022.fir.ir.txt
+++ /dev/null
@@ -1,35 +0,0 @@
-FILE fqName:<root> fileName:/kt45022.kt
-  TYPEALIAS name:AX visibility:public expandedType:<root>.X
-  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.Unit
-    BLOCK_BODY
-      CALL 'public final fun plusAssign (any: kotlin.Any): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=null
-        $this: GET_OBJECT 'CLASS OBJECT name:X modality:FINAL visibility:public superTypes:[kotlin.Any]' type=<root>.X
-        any: CONST Int type=kotlin.Int value=1
-      CALL 'public final fun plusAssign (any: kotlin.Any): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=null
-        $this: GET_OBJECT 'CLASS OBJECT name:X modality:FINAL visibility:public superTypes:[kotlin.Any]' type=<root>.X
-        any: CONST Int type=kotlin.Int value=1
-  CLASS OBJECT name:X modality:FINAL visibility:public superTypes:[kotlin.Any]
-    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.X
-    CONSTRUCTOR visibility:private <> () returnType:<root>.X [primary]
-      BLOCK_BODY
-        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () declared in kotlin.Any'
-        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS OBJECT name:X modality:FINAL visibility:public superTypes:[kotlin.Any]'
-    FUN name:plusAssign visibility:public modality:FINAL <> ($this:<root>.X, any:kotlin.Any) returnType:kotlin.Unit [operator]
-      $this: VALUE_PARAMETER name:<this> type:<root>.X
-      VALUE_PARAMETER name:any index:0 type:kotlin.Any
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun plusAssign (any: kotlin.Any): kotlin.Unit declared in <root>.X'
-          GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
-    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
-    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
diff --git a/compiler/testData/ir/irText/expressions/kt45022.kt b/compiler/testData/ir/irText/expressions/kt45022.kt
index b8fd8d7083b..512d8888cb7 100644
--- a/compiler/testData/ir/irText/expressions/kt45022.kt
+++ b/compiler/testData/ir/irText/expressions/kt45022.kt
@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // SKIP_KT_DUMP
 
 typealias AX = X
diff --git a/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt b/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt
index dd406913fed..133d04c0416 100644
--- a/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt
@@ -140,11 +140,11 @@ FILE fqName:<root> fileName:/kt49203.kt
   FUN name:test visibility:public modality:FINAL <> (b:<root>.B) returnType:kotlin.Unit
     VALUE_PARAMETER name:b index:0 type:<root>.B
     BLOCK_BODY
-      CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=PLUSEQ
         $this: CALL 'public final fun <get-x> (): <root>.X declared in <root>.B' type=<root>.X origin=GET_PROPERTY
           $this: GET_VAR 'b: <root>.B declared in <root>.test' type=<root>.B origin=null
         data: CONST String type=kotlin.String value="x"
-      CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=PLUSEQ
         $this: CALL 'public final fun <get-y> (): <root>.X declared in <root>.B' type=<root>.X origin=GET_PROPERTY
           $this: GET_VAR 'b: <root>.B declared in <root>.test' type=<root>.B origin=null
         data: CONST String type=kotlin.String value="y"
diff --git a/compiler/testData/ir/irText/expressions/lambdaInCAO.fir.ir.txt b/compiler/testData/ir/irText/expressions/lambdaInCAO.fir.ir.txt
index c7695b3f103..92069b1f574 100644
--- a/compiler/testData/ir/irText/expressions/lambdaInCAO.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/lambdaInCAO.fir.ir.txt
@@ -17,7 +17,7 @@ FILE fqName:<root> fileName:/lambdaInCAO.kt
   FUN name:test1 visibility:public modality:FINAL <> (a:kotlin.Any) returnType:kotlin.Unit
     VALUE_PARAMETER name:a index:0 type:kotlin.Any
     BLOCK_BODY
-      CALL 'public final fun plusAssign (lambda: kotlin.Function0<kotlin.Unit>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+      CALL 'public final fun plusAssign (lambda: kotlin.Function0<kotlin.Unit>): kotlin.Unit declared in <root>' type=kotlin.Unit origin=PLUSEQ
         $receiver: GET_VAR 'a: kotlin.Any declared in <root>.test1' type=kotlin.Any origin=null
         lambda: FUN_EXPR type=kotlin.Function0<kotlin.Unit> origin=LAMBDA
           FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> () returnType:kotlin.Unit
diff --git a/compiler/testData/ir/irText/expressions/sam/samOperators.fir.ir.txt b/compiler/testData/ir/irText/expressions/sam/samOperators.fir.ir.txt
index 9fae09d9221..14f07e3d66b 100644
--- a/compiler/testData/ir/irText/expressions/sam/samOperators.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/sam/samOperators.fir.ir.txt
@@ -34,11 +34,11 @@ FILE fqName:<root> fileName:/samOperators.kt
   FUN name:test3 visibility:public modality:FINAL <> ($receiver:<root>.J) returnType:kotlin.Unit
     $receiver: VALUE_PARAMETER name:<this> type:<root>.J
     BLOCK_BODY
-      CALL 'public open fun plusAssign (i: @[FlexibleNullability] java.lang.Runnable?): kotlin.Unit declared in <root>.J' type=kotlin.Unit origin=null
+      CALL 'public open fun plusAssign (i: @[FlexibleNullability] java.lang.Runnable?): kotlin.Unit declared in <root>.J' type=kotlin.Unit origin=PLUSEQ
         $this: GET_VAR '<this>: <root>.J declared in <root>.test3' type=<root>.J origin=null
         i: TYPE_OP type=@[FlexibleNullability] java.lang.Runnable? origin=SAM_CONVERSION typeOperand=@[FlexibleNullability] java.lang.Runnable?
           FUNCTION_REFERENCE 'public final fun f (): kotlin.Unit declared in <root>' type=kotlin.reflect.KFunction0<kotlin.Unit> origin=null reflectionTarget=<same>
-      CALL 'public open fun minusAssign (i: @[FlexibleNullability] java.lang.Runnable?): kotlin.Unit declared in <root>.J' type=kotlin.Unit origin=null
+      CALL 'public open fun minusAssign (i: @[FlexibleNullability] java.lang.Runnable?): kotlin.Unit declared in <root>.J' type=kotlin.Unit origin=MINUSEQ
         $this: GET_VAR '<this>: <root>.J declared in <root>.test3' type=<root>.J origin=null
         i: TYPE_OP type=@[FlexibleNullability] java.lang.Runnable? origin=SAM_CONVERSION typeOperand=@[FlexibleNullability] java.lang.Runnable?
           FUNCTION_REFERENCE 'public final fun f (): kotlin.Unit declared in <root>' type=kotlin.reflect.KFunction0<kotlin.Unit> origin=null reflectionTarget=<same>
diff --git a/compiler/testData/ir/sourceRanges/augmentedAssignmentWithExpression.fir.txt b/compiler/testData/ir/sourceRanges/augmentedAssignmentWithExpression.fir.txt
index f43ede49f19..a084e811a21 100644
--- a/compiler/testData/ir/sourceRanges/augmentedAssignmentWithExpression.fir.txt
+++ b/compiler/testData/ir/sourceRanges/augmentedAssignmentWithExpression.fir.txt
@@ -11,7 +11,7 @@
     @5:4..7:5 FUN name:test1 visibility:public modality:FINAL <> ($this:test.Host) returnType:kotlin.Unit
       @5:4..7:5 VALUE_PARAMETER name:<this> type:test.Host
       @5:16..7:5 BLOCK_BODY
-        @6:8..17 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=null
+        @6:8..17 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=PLUSEQ
           @6:8..12 GET_VAR '<this>: test.Host declared in test.Host.test1' type=test.Host origin=null
           @6:16..17 CONST Int type=kotlin.Int value=1
     @-1:-1..-1 FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
@@ -29,18 +29,18 @@
   @12:0..14:1 FUN name:test2 visibility:public modality:FINAL <> ($receiver:test.Host) returnType:kotlin.Unit
     @12:4..8 VALUE_PARAMETER name:<this> type:test.Host
     @12:17..14:1 BLOCK_BODY
-      @13:4..13 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=null
+      @13:4..13 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=PLUSEQ
         @13:4..8 GET_VAR '<this>: test.Host declared in test.test2' type=test.Host origin=null
         @13:12..13 CONST Int type=kotlin.Int value=1
   @16:0..18:1 FUN name:test3 visibility:public modality:FINAL <> () returnType:kotlin.Unit
     @16:12..18:1 BLOCK_BODY
-      @17:4..14 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=null
+      @17:4..14 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=PLUSEQ
         @17:4..9 CALL 'public final fun foo (): test.Host declared in test' type=test.Host origin=null
         @17:13..14 CONST Int type=kotlin.Int value=1
   @20:0..22:1 FUN name:test4 visibility:public modality:FINAL <> (a:kotlin.Function0<test.Host>) returnType:kotlin.Unit
     @20:10..23 VALUE_PARAMETER name:a index:0 type:kotlin.Function0<test.Host>
     @20:25..22:1 BLOCK_BODY
-      @21:4..12 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=null
+      @21:4..12 CALL 'public final fun plusAssign (x: kotlin.Int): kotlin.Unit [operator] declared in test.Host' type=kotlin.Unit origin=PLUSEQ
         @21:4..7 CALL 'public abstract fun invoke (): R of kotlin.Function0 [operator] declared in kotlin.Function0' type=test.Host origin=INVOKE
           @21:4..5 GET_VAR 'a: kotlin.Function0<test.Host> declared in test.test4' type=kotlin.Function0<test.Host> origin=VARIABLE_AS_FUNCTION
         @21:11..12 CONST Int type=kotlin.Int value=1