Add mixed compare benchmark baseline

lynglib/src/commonTest/kotlin/MixedCompareBenchmarkTest.kt

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+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * 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.
+ *
+ */
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.Benchmarks
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.obj.ObjInt
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.time.TimeSource
+
+class MixedCompareBenchmarkTest {
+    @Test
+    fun benchmarkMixedCompareOps() = runTest {
+        if (!Benchmarks.enabled) return@runTest
+        val iterations = 200000
+        val script = """
+            fun mixedCompareBench(n) {
+                var acc = 0
+                var r = 0.0
+                val strs = ["a","b","aa","bb","abc","abd","zzz",""]
+                var i = 0
+                while(i < n) {
+                    val si = strs[i % 8]
+                    if( si == "a" ) acc += 1 else acc -= 1
+                    if( si != "zzz" ) acc += 2
+                    if( si == "" ) acc += 3
+
+                    if( i < (i % 5) ) acc += 1 else acc -= 1
+                    if( (i % 3) == 0 ) acc += 2
+
+                    val r1 = i + 0.5
+                    if( r1 > i ) acc += 1
+                    if( i < r1 ) acc += 1
+                    r += r1 * 0.25
+                    if( r > 1000.0 ) acc += 1
+
+                    i++
+                }
+                acc
+            }
+        """.trimIndent()
+
+        val scope = Script.newScope()
+        scope.eval(script)
+        val expected = expectedValue(iterations)
+
+        val start = TimeSource.Monotonic.markNow()
+        val result = scope.eval("mixedCompareBench($iterations)") as ObjInt
+        val elapsedMs = start.elapsedNow().inWholeMilliseconds
+        println("[DEBUG_LOG] [BENCH] mixed-compare elapsed=${elapsedMs} ms")
+        assertEquals(expected, result.value)
+    }
+
+    private fun expectedValue(iterations: Int): Long {
+        val strs = arrayOf("a", "b", "aa", "bb", "abc", "abd", "zzz", "")
+        var acc = 0L
+        var r = 0.0
+        var i = 0
+        while (i < iterations) {
+            val si = strs[i % 8]
+            if (si == "a") acc += 1 else acc -= 1
+            if (si != "zzz") acc += 2
+            if (si == "") acc += 3
+
+            if (i < (i % 5)) acc += 1 else acc -= 1
+            if ((i % 3) == 0) acc += 2
+
+            val r1 = i + 0.5
+            if (r1 > i) acc += 1
+            if (i < r1) acc += 1
+            r += r1 * 0.25
+            if (r > 1000.0) acc += 1
+
+            i += 1
+        }
+        return acc
+    }
+}

notes/fast_ops_optimizations_plan.md

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+# Fast Ops Optimizations Plan (Draft)
+
+Baseline
+- See `notes/nested_range_baseline.md`
+
+Candidates (not started)
+1) Primitive comparisons
+   - Emit fast CMP variants for known ObjString/ObjInt/ObjReal/ObjBool across all comparison operators.
+2) Mixed numeric ops
+   - Ensure INT+REAL arithmetic uses INT_TO_REAL + REAL op with no extra moves/boxing.
+3) Boolean conversion
+   - Skip OBJ_TO_BOOL when compiler already has a BOOL slot.
+4) Range/loop hot path
+   - Keep range iteration in INT ops, avoid accidental boxing.
+   - Confirm loop-var slots avoid re-boxing in loop bodies.
+5) String ops
+   - Extend fast path for string comparisons in hot loops.
+6) Box/unbox audit
+   - Identify remaining BOX_OBJ / OBJ_TO_* in inner loops and eliminate when safe.

notes/mixed_compare_benchmark_baseline.md

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+# Mixed Compare Benchmark Baseline
+
+Date: 2026-02-16
+
+Benchmark:
+- MixedCompareBenchmarkTest.benchmarkMixedCompareOps
+
+Command:
+`BENCHMARKS=true timeout 20s ./gradlew :lynglib:jvmTest --tests MixedCompareBenchmarkTest --rerun-tasks`
+
+Result:
+- mixed-compare elapsed=374 ms