From 571943a71538784fc3bf321369e9d8c3732ef7b3 Mon Sep 17 00:00:00 2001
From: Filipp Zhinkin <filipp.zhinkin@jetbrains.com>
Date: Fri, 3 May 2024 17:19:35 +0200
Subject: [PATCH] Add Int.sign and Long.sing benchmarks (KT-67023)

---
 .../microBenchmarks/IntegerSignBenchmark.kt   | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/commonMain/kotlin/microBenchmarks/IntegerSignBenchmark.kt

diff --git a/src/commonMain/kotlin/microBenchmarks/IntegerSignBenchmark.kt b/src/commonMain/kotlin/microBenchmarks/IntegerSignBenchmark.kt
new file mode 100644
index 0000000..6c849cf
--- /dev/null
+++ b/src/commonMain/kotlin/microBenchmarks/IntegerSignBenchmark.kt
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2024 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package microBenchmarks
+
+import kotlinx.benchmark.*
+import kotlin.math.sign
+
+@State(Scope.Benchmark)
+class IntegerSignBenchmark {
+    private var intValue = 1
+    private var longValue = 1L
+
+    fun nextInt(): Int {
+        val r = intValue
+        // see https://en.wikipedia.org/wiki/Linear_congruential_generator#Parameters_in_common_use
+        intValue = intValue * 1664525 + 1013904223
+        return r
+    }
+
+    fun nextLong(): Long {
+        val r = longValue
+        // see https://en.wikipedia.org/wiki/Linear_congruential_generator#Parameters_in_common_use
+        longValue = longValue * 6364136223846793005 + 1442695040888963407
+        return r
+    }
+
+    @Benchmark
+    fun intSign(blackhole: Blackhole) {
+        blackhole.consume(nextInt().sign)
+    }
+
+    @Benchmark
+    fun longSign(blackhole: Blackhole) {
+        blackhole.consume(nextLong().sign)
+    }
+}