[K/N] Filecheck test for EnumWhenLowering

kotlin-native/backend.native/tests/build.gradle

@@ -6019,6 +6019,10 @@ fileCheckTest("filecheck_escape_analysis_enabled") {
     checkPrefix = "CHECK-OPT"
 }
 
+fileCheckTest("filecheck_enum_when") {
+    annotatedSource = project.file('filecheck/enum_when.kt')
+}
+
 fileCheckTest("filecheck_escape_analysis_disabled") {
     annotatedSource = project.file('filecheck/escape_analysis.kt')
     enabled = project.globalTestArgs.contains('-g')

kotlin-native/backend.native/tests/filecheck/enum_when.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+enum class COLOR {
+    RED,
+    GREEN,
+    BLUE
+}
+
+// CHECK-LABEL: "kfun:#main(){}"
+fun main() {
+    for (i in COLOR.values()) {
+        // CHECK: = call i32 @"kfun:kotlin.Enum#<get-ordinal>(){}kotlin.Int"(
+        print(when (i) {
+            // we can't check the register is same, because it can be saved on stack and loaded back
+            // CHECK: icmp eq i32 %{{[0-9a-z]*}}, 0
+            COLOR.RED -> 0xff0000
+            // CHECK: icmp eq i32 %{{[0-9a-z]*}}, 1
+            COLOR.GREEN -> 0x00ff00
+            // CHECK: icmp eq i32 %{{[0-9a-z]*}}, 2
+            COLOR.BLUE -> 0x0000ff
+        })
+    }
+    // CHECK-LABEL: epilogue:
+}