Stabilize pi benchmark optimizations for release

2026-04-03 23:16:08 +03:00
1 parent a7ab0d3905
commit 064b927b1a
@@ -1783,7 +1783,11 @@ class BytecodeCompiler(
        return when (slotTypes[slot]) {
            SlotType.INT -> NumericKind.INT
            SlotType.REAL -> NumericKind.REAL
-            else -> NumericKind.UNKNOWN
+            else -> when (slotObjClass[slot]) {
+                ObjInt.type -> NumericKind.INT
+                ObjReal.type -> NumericKind.REAL
+                else -> NumericKind.UNKNOWN
+            }
        }
    }

@@ -1800,7 +1804,21 @@ class BytecodeCompiler(
            is ConstRef -> numericKindFromConst(ref.constValue)
            is LocalVarRef -> resolveDirectNameSlot(ref.name)?.let { numericKindFromSlot(it.slot) } ?: NumericKind.UNKNOWN
            is FastLocalVarRef -> resolveDirectNameSlot(ref.name)?.let { numericKindFromSlot(it.slot) } ?: NumericKind.UNKNOWN
-            is LocalSlotRef -> resolveSlot(ref)?.let { numericKindFromSlot(it) } ?: NumericKind.UNKNOWN
+            is LocalSlotRef -> resolveLocalSlotByRefOrName(ref)?.let { numericKindFromSlot(it) } ?: NumericKind.UNKNOWN
+            is IndexRef -> {
+                val receiver = when (val target = ref.targetRef) {
+                    is LocalSlotRef -> resolveLocalSlotByRefOrName(target)
+                    is LocalVarRef -> resolveDirectNameSlot(target.name)?.slot
+                    is FastLocalVarRef -> resolveDirectNameSlot(target.name)?.slot
+                    else -> null
+                }
+                val elementClass = receiver?.let { listElementClassBySlot[it] } ?: listElementClassFromReceiverRef(ref.targetRef)
+                when (elementClass) {
+                    ObjInt.type -> NumericKind.INT
+                    ObjReal.type -> NumericKind.REAL
+                    else -> NumericKind.UNKNOWN
+                }
+            }
            is UnaryOpRef -> inferNumericKind(ref.a)
            is BinaryOpRef -> {
                val op = ref.op
@@ -2431,7 +2449,7 @@ class BytecodeCompiler(
                updateSlotType(slot, SlotType.OBJ)
                return value
            }
-            val value = compileRef(assignValue(ref)) ?: return null
+            var value = compileRef(assignValue(ref)) ?: return null
            if (isLoopVarRef(localTarget)) {
                emitLoopVarReassignError(localTarget.name, localTarget.pos())
                return value
@@ -2473,7 +2491,7 @@ class BytecodeCompiler(
            else -> null
        }
        if (nameTarget != null) {
-            val value = compileRef(assignValue(ref)) ?: return null
+            var value = compileRef(assignValue(ref)) ?: return null
            val resolved = resolveAssignableSlotByName(nameTarget) ?: return null
            val slot = resolved.first
            val isMutable = resolved.second
@@ -2698,6 +2716,7 @@ class BytecodeCompiler(
            if (!target.optionalRef) {
                val index = compileRefWithFallback(target.indexRef, null, Pos.builtIn) ?: return null
                builder.emit(Opcode.SET_INDEX, receiver.slot, index.slot, value.slot)
+                noteListElementClassMutation(receiver.slot, value)
            } else {
                val nullSlot = allocSlot()
                builder.emit(Opcode.CONST_NULL, nullSlot)
@@ -2710,6 +2729,7 @@ class BytecodeCompiler(
                )
                val index = compileRefWithFallback(target.indexRef, null, Pos.builtIn) ?: return null
                builder.emit(Opcode.SET_INDEX, receiver.slot, index.slot, value.slot)
+                noteListElementClassMutation(receiver.slot, value)
                builder.mark(endLabel)
            }
            return value
@@ -3026,9 +3046,32 @@ class BytecodeCompiler(
            val receiver = compileRefWithFallback(indexTarget.targetRef, null, Pos.builtIn) ?: return null
            val current = allocSlot()
            val result = allocSlot()
-            val rhs = compileRef(ref.value) ?: return compileEvalRef(ref)
+            var rhs = compileRef(ref.value) ?: return compileEvalRef(ref)
+            val elementClass = listElementClassBySlot[receiver.slot] ?: listElementClassFromReceiverRef(indexTarget.targetRef)
            if (!indexTarget.optionalRef) {
                val index = compileRefWithFallback(indexTarget.indexRef, null, Pos.builtIn) ?: return null
+                if (elementClass == ObjInt.type) {
+                    builder.emit(Opcode.GET_INDEX, receiver.slot, index.slot, current)
+                    val currentInt = allocSlot()
+                    builder.emit(Opcode.UNBOX_INT_OBJ, current, currentInt)
+                    updateSlotType(currentInt, SlotType.INT)
+                    if (rhs.type != SlotType.INT) {
+                        coerceToArithmeticInt(ref.value, rhs)?.let { rhs = it }
+                    }
+                    val typed = when (ref.op) {
+                        BinOp.PLUS -> compileAssignOpBinary(SlotType.INT, rhs, currentInt, Opcode.ADD_INT, Opcode.ADD_REAL, Opcode.ADD_OBJ)
+                        BinOp.MINUS -> compileAssignOpBinary(SlotType.INT, rhs, currentInt, Opcode.SUB_INT, Opcode.SUB_REAL, Opcode.SUB_OBJ)
+                        BinOp.STAR -> compileAssignOpBinary(SlotType.INT, rhs, currentInt, Opcode.MUL_INT, Opcode.MUL_REAL, Opcode.MUL_OBJ)
+                        BinOp.SLASH -> compileAssignOpBinary(SlotType.INT, rhs, currentInt, Opcode.DIV_INT, Opcode.DIV_REAL, Opcode.DIV_OBJ)
+                        BinOp.PERCENT -> compileAssignOpBinary(SlotType.INT, rhs, currentInt, Opcode.MOD_INT, null, Opcode.MOD_OBJ)
+                        else -> null
+                    }
+                    if (typed != null && typed.type == SlotType.INT) {
+                        builder.emit(Opcode.SET_INDEX, receiver.slot, index.slot, currentInt)
+                        noteListElementClassMutation(receiver.slot, typed)
+                        return CompiledValue(currentInt, SlotType.INT)
+                    }
+                }
                builder.emit(Opcode.GET_INDEX, receiver.slot, index.slot, current)
                builder.emit(objOp, current, rhs.slot, result)
                builder.emit(Opcode.SET_INDEX, receiver.slot, index.slot, result)
@@ -3586,7 +3629,7 @@ class BytecodeCompiler(
        val elementClass = listElementClassBySlot[receiver.slot] ?: listElementClassFromReceiverRef(ref.targetRef)
        if (elementClass != null) {
            slotObjClass[dst] = elementClass
-            if (elementClass == ObjString.type && elementClass.isClosed) {
+            if (elementClass.isClosed) {
                stableObjSlots.add(dst)
            } else {
                stableObjSlots.remove(dst)
@@ -4649,6 +4692,9 @@ class BytecodeCompiler(
                val encodedCount = encodeCallArgCount(args) ?: return null
                setPos(callPos)
                builder.emit(Opcode.CALL_MEMBER_SLOT, receiver.slot, encodedMethodId, args.base, encodedCount, dst)
+                if (receiverClass == ObjList.type && ref.name == "add" && ref.args.size == 1 && !ref.args.first().isSplat) {
+                    noteListElementClassMutation(receiver.slot, CompiledValue(args.base, SlotType.OBJ))
+                }
                return CompiledValue(dst, SlotType.OBJ)
            }
            val nullSlot = allocSlot()
@@ -4815,7 +4861,7 @@ class BytecodeCompiler(
                " receiver=$kind(${ref.name}) slot=$slot slotClass=$slotCls nameClass=$nameCls"
            }
            is LocalSlotRef -> {
-                val slot = resolveSlot(ref)
+                val slot = resolveLocalSlotByRefOrName(ref)
                val slotCls = slot?.let { slotObjClass[it]?.className }
                val nameCls = nameObjClass[ref.name]?.className
                val scopeId = refScopeId(ref)
@@ -4971,9 +5017,10 @@ class BytecodeCompiler(
        val specs = if (needPlan) ArrayList<BytecodeConst.CallArgSpec>(args.size) else null
        for ((index, arg) in args.withIndex()) {
            val compiled = compileArgValue(arg.value) ?: return null
+            val objValue = ensureObjSlot(compiled)
            val dst = argSlots[index]
-            if (compiled.slot != dst || compiled.type != SlotType.OBJ) {
-                builder.emit(Opcode.BOX_OBJ, compiled.slot, dst)
+            if (objValue.slot != dst) {
+                emitMove(objValue, dst)
            }
            updateSlotType(dst, SlotType.OBJ)
            specs?.add(BytecodeConst.CallArgSpec(arg.name, arg.isSplat))
@@ -5833,7 +5880,8 @@ class BytecodeCompiler(
                emitMove(value, localSlot)
            }
            updateSlotType(localSlot, value.type)
-            updateSlotObjClass(localSlot, stmt.initializer, stmt.initializerObjClass)
+            slotObjClass[value.slot]?.let { slotObjClass[localSlot] = it }
+                ?: updateSlotObjClass(localSlot, stmt.initializer, stmt.initializerObjClass)
            updateListElementClassFromDecl(localSlot, scopeId, stmt.slotIndex)
            updateListElementClassFromInitializer(localSlot, stmt.initializer)
            updateNameObjClassFromSlot(stmt.name, localSlot)
@@ -5865,7 +5913,8 @@ class BytecodeCompiler(
            }
            updateSlotType(scopeSlot, value.type)
            updateNameObjClassFromSlot(stmt.name, scopeSlot)
-            updateSlotObjClass(scopeSlot, stmt.initializer, stmt.initializerObjClass)
+            slotObjClass[value.slot]?.let { slotObjClass[scopeSlot] = it }
+                ?: updateSlotObjClass(scopeSlot, stmt.initializer, stmt.initializerObjClass)
            updateListElementClassFromDecl(scopeSlot, scopeId, stmt.slotIndex)
            updateListElementClassFromInitializer(scopeSlot, stmt.initializer)
            val declId = builder.addConst(
@@ -5901,7 +5950,9 @@ class BytecodeCompiler(
            updateSlotTypeByName(stmt.name, value.type)
        }
        updateNameObjClassFromSlot(stmt.name, value.slot)
-        updateSlotObjClass(value.slot, stmt.initializer, stmt.initializerObjClass)
+        if (slotObjClass[value.slot] == null) {
+            updateSlotObjClass(value.slot, stmt.initializer, stmt.initializerObjClass)
+        }
        updateListElementClassFromDecl(value.slot, scopeId, stmt.slotIndex)
        updateListElementClassFromInitializer(value.slot, stmt.initializer)
        return value
@@ -5991,6 +6042,16 @@ class BytecodeCompiler(
        listElementClassBySlot[slot] = elementClass
    }

+    private fun noteListElementClassMutation(receiverSlot: Int, value: CompiledValue) {
+        val newClass = elementClassFromValue(value) ?: return
+        val current = listElementClassBySlot[receiverSlot]
+        if (current == null || current == newClass) {
+            listElementClassBySlot[receiverSlot] = newClass
+        } else {
+            listElementClassBySlot.remove(receiverSlot)
+        }
+    }
+
    private fun updateNameObjClassFromSlot(name: String, slot: Int) {
        val cls = slotObjClass[slot] ?: return
        nameObjClass[name] = cls
@@ -6086,9 +6147,6 @@ class BytecodeCompiler(
        if (range == null && rangeRef == null) {
            rangeRef = extractRangeFromLocal(stmt.source)
        }
-        if (rangeRef != null && !isConstIntRange(rangeRef)) {
-            rangeRef = null
-        }
        val typedRangeLocal = if (range == null && rangeRef == null) extractTypedRangeLocal(stmt.source) else null
        val loopSlotPlan = stmt.loopSlotPlan
        val loopSlotIndex = stmt.loopSlotPlan[stmt.loopVarName]
@@ -6129,120 +6187,16 @@ class BytecodeCompiler(
        val breakFlagSlot = allocSlot()
        if (range == null && rangeRef == null && typedRangeLocal == null) {
            val sourceValue = compileStatementValueOrFallback(stmt.source) ?: return null
-            val sourceObj = ensureObjSlot(sourceValue)
-            val typeId = builder.addConst(BytecodeConst.ObjRef(ObjIterable))
-            val typeSlot = allocSlot()
-            builder.emit(Opcode.CONST_OBJ, typeId, typeSlot)
-            builder.emit(Opcode.ASSERT_IS, sourceObj.slot, typeSlot)
-
-            val iterableMethods = ObjIterable.instanceMethodIdMap(includeAbstract = true)
-            val iteratorMethodId = iterableMethods["iterator"]
-            if (iteratorMethodId == null) {
-                throw BytecodeCompileException("Missing member id for Iterable.iterator", stmt.pos)
-            }
-            val iteratorMethods = ObjIterator.instanceMethodIdMap(includeAbstract = true)
-            val hasNextMethodId = iteratorMethods["hasNext"]
-            if (hasNextMethodId == null) {
-                throw BytecodeCompileException("Missing member id for Iterator.hasNext", stmt.pos)
-            }
-            val nextMethodId = iteratorMethods["next"]
-            if (nextMethodId == null) {
-                throw BytecodeCompileException("Missing member id for Iterator.next", stmt.pos)
-            }
-
-            val iterSlot = allocSlot()
-            builder.emit(Opcode.CALL_MEMBER_SLOT, sourceObj.slot, iteratorMethodId, 0, 0, iterSlot)
-            builder.emit(Opcode.ITER_PUSH, iterSlot)
-
-            if (needsBreakFlag) {
-                val falseId = builder.addConst(BytecodeConst.Bool(false))
-                builder.emit(Opcode.CONST_BOOL, falseId, breakFlagSlot)
-            }
-            val resultSlot = if (wantResult) {
-                val slot = allocSlot()
-                val voidId = builder.addConst(BytecodeConst.ObjRef(ObjVoid))
-                builder.emit(Opcode.CONST_OBJ, voidId, slot)
-                slot
-            } else {
-                null
-            }
-
-            val loopLabel = builder.label()
-            val continueLabel = builder.label()
-            val endLabel = builder.label()
-            builder.mark(loopLabel)
-
-            val hasNextSlot = allocSlot()
-            builder.emit(Opcode.CALL_MEMBER_SLOT, iterSlot, hasNextMethodId, 0, 0, hasNextSlot)
-            val condSlot = allocSlot()
-            builder.emit(Opcode.OBJ_TO_BOOL, hasNextSlot, condSlot)
-            builder.emit(
-                Opcode.JMP_IF_FALSE,
-                listOf(CmdBuilder.Operand.IntVal(condSlot), CmdBuilder.Operand.LabelRef(endLabel))
+            return emitIterableForIn(
+                stmt = stmt,
+                sourceValue = sourceValue,
+                wantResult = wantResult,
+                loopSlotId = loopSlotId,
+                breakFlagSlot = breakFlagSlot,
+                needsBreakFlag = needsBreakFlag,
+                hasRealWiden = hasRealWiden,
+                realWidenSlots = realWidenSlots,
            )
-
-            val nextSlot = allocSlot()
-            builder.emit(Opcode.CALL_MEMBER_SLOT, iterSlot, nextMethodId, 0, 0, nextSlot)
-            val nextObj = ensureObjSlot(CompiledValue(nextSlot, SlotType.UNKNOWN))
-            emitMove(CompiledValue(nextObj.slot, SlotType.OBJ), loopSlotId)
-            updateSlotType(loopSlotId, SlotType.OBJ)
-            updateSlotTypeByName(stmt.loopVarName, SlotType.OBJ)
-
-            loopStack.addLast(
-                LoopContext(
-                    stmt.label,
-                    endLabel,
-                    continueLabel,
-                    breakFlagSlot,
-                    resultSlot,
-                    hasIterator = true
-                )
-            )
-            val bodyValue = compileLoopBody(stmt.body, wantResult) ?: return null
-            if (hasRealWiden) {
-                applySlotTypes(realWidenSlots, SlotType.UNKNOWN)
-            }
-            loopStack.removeLast()
-            if (wantResult) {
-                val bodyObj = ensureObjSlot(bodyValue)
-                builder.emit(Opcode.MOVE_OBJ, bodyObj.slot, resultSlot!!)
-            }
-            builder.mark(continueLabel)
-            if (hasRealWiden) {
-                emitLoopRealCoercions(realWidenSlots)
-            }
-            builder.emit(Opcode.JMP, listOf(CmdBuilder.Operand.LabelRef(loopLabel)))
-
-            builder.mark(endLabel)
-            if (needsBreakFlag) {
-                val afterPop = builder.label()
-                builder.emit(
-                    Opcode.JMP_IF_TRUE,
-                    listOf(CmdBuilder.Operand.IntVal(breakFlagSlot), CmdBuilder.Operand.LabelRef(afterPop))
-                )
-                builder.emit(Opcode.ITER_POP)
-                builder.mark(afterPop)
-            } else {
-                builder.emit(Opcode.ITER_POP)
-            }
-            if (stmt.elseStatement != null) {
-                val afterElse = if (needsBreakFlag) builder.label() else null
-                if (needsBreakFlag) {
-                    builder.emit(
-                        Opcode.JMP_IF_TRUE,
-                        listOf(CmdBuilder.Operand.IntVal(breakFlagSlot), CmdBuilder.Operand.LabelRef(afterElse!!))
-                    )
-                }
-                val elseValue = compileStatementValueOrFallback(stmt.elseStatement, wantResult) ?: return null
-                if (wantResult) {
-                    val elseObj = ensureObjSlot(elseValue)
-                    builder.emit(Opcode.MOVE_OBJ, elseObj.slot, resultSlot!!)
-                }
-                if (needsBreakFlag) {
-                    builder.mark(afterElse!!)
-                }
-            }
-            return resultSlot ?: breakFlagSlot
        }

        val iSlot = loopSlotId
@@ -6261,9 +6215,23 @@ class BytecodeCompiler(
            if (rangeRef != null) {
                val left = rangeRef.left ?: return null
                val right = rangeRef.right ?: return null
-                val startValue = compileRef(left) ?: return null
-                val endValue = compileRef(right) ?: return null
-                if (startValue.type != SlotType.INT || endValue.type != SlotType.INT) return null
+                val startCompiled = compileRef(left) ?: return null
+                val endCompiled = compileRef(right) ?: return null
+                val startValue = coerceToLoopInt(startCompiled)
+                val endValue = coerceToLoopInt(endCompiled)
+                if (startValue == null || endValue == null) {
+                    val rangeValue = emitRangeObject(startCompiled, endCompiled, rangeRef)
+                    return emitIterableForIn(
+                        stmt = stmt,
+                        sourceValue = rangeValue,
+                        wantResult = wantResult,
+                        loopSlotId = loopSlotId,
+                        breakFlagSlot = breakFlagSlot,
+                        needsBreakFlag = needsBreakFlag,
+                        hasRealWiden = hasRealWiden,
+                        realWidenSlots = realWidenSlots,
+                    )
+                }
                val descendingId = builder.addConst(BytecodeConst.Bool(rangeRef.isDescending))
                emitMove(startValue, iSlot)
                emitMove(endValue, endSlot)
@@ -7308,7 +7276,8 @@ class BytecodeCompiler(
            is LocalSlotRef -> {
                val ownerScopeId = ref.captureOwnerScopeId ?: ref.scopeId
                val ownerSlot = ref.captureOwnerSlot ?: ref.slot
-                slotTypeByScopeId[ownerScopeId]?.get(ownerSlot)
+                resolveLocalSlotByRefOrName(ref)?.let { slotObjClass[it] }
+                    ?: slotTypeByScopeId[ownerScopeId]?.get(ownerSlot)
                    ?: slotInitClassByKey[ScopeSlotKey(ownerScopeId, ownerSlot)]
                    ?: nameObjClass[ref.name]
                    ?: resolveTypeNameClass(ref.name)
@@ -7721,6 +7690,11 @@ class BytecodeCompiler(
        return resolved
    }

+    private fun resolveLocalSlotByRefOrName(ref: LocalSlotRef): Int? {
+        return resolveSlot(ref)
+            ?: ref.name.takeIf { it.isNotEmpty() }?.let { name -> resolveDirectNameSlot(name)?.slot }
+    }
+
    private fun resolveCapturedOwnerScopeSlot(ref: LocalSlotRef): Int? {
        val ownerScopeId = ref.captureOwnerScopeId ?: return null
        val ownerSlot = ref.captureOwnerSlot ?: return null
@@ -8698,10 +8672,237 @@ class BytecodeCompiler(
        return if (ref.step != null) null else ref
    }

-    private fun isConstIntRange(ref: RangeRef): Boolean {
-        val left = ref.left as? ConstRef ?: return false
-        val right = ref.right as? ConstRef ?: return false
-        return left.constValue is ObjInt && right.constValue is ObjInt
+    private fun emitIterableForIn(
+        stmt: net.sergeych.lyng.ForInStatement,
+        sourceValue: CompiledValue,
+        wantResult: Boolean,
+        loopSlotId: Int,
+        breakFlagSlot: Int,
+        needsBreakFlag: Boolean,
+        hasRealWiden: Boolean,
+        realWidenSlots: Set<Int>,
+    ): Int? {
+        val sourceObj = ensureObjSlot(sourceValue)
+        val typeId = builder.addConst(BytecodeConst.ObjRef(ObjIterable))
+        val typeSlot = allocSlot()
+        builder.emit(Opcode.CONST_OBJ, typeId, typeSlot)
+        builder.emit(Opcode.ASSERT_IS, sourceObj.slot, typeSlot)
+
+        val iterableMethods = ObjIterable.instanceMethodIdMap(includeAbstract = true)
+        val iteratorMethodId = iterableMethods["iterator"]
+            ?: throw BytecodeCompileException("Missing member id for Iterable.iterator", stmt.pos)
+        val iteratorMethods = ObjIterator.instanceMethodIdMap(includeAbstract = true)
+        val hasNextMethodId = iteratorMethods["hasNext"]
+            ?: throw BytecodeCompileException("Missing member id for Iterator.hasNext", stmt.pos)
+        val nextMethodId = iteratorMethods["next"]
+            ?: throw BytecodeCompileException("Missing member id for Iterator.next", stmt.pos)
+
+        val iterSlot = allocSlot()
+        builder.emit(Opcode.CALL_MEMBER_SLOT, sourceObj.slot, iteratorMethodId, 0, 0, iterSlot)
+        builder.emit(Opcode.ITER_PUSH, iterSlot)
+
+        if (needsBreakFlag) {
+            val falseId = builder.addConst(BytecodeConst.Bool(false))
+            builder.emit(Opcode.CONST_BOOL, falseId, breakFlagSlot)
+        }
+        val resultSlot = if (wantResult) {
+            val slot = allocSlot()
+            val voidId = builder.addConst(BytecodeConst.ObjRef(ObjVoid))
+            builder.emit(Opcode.CONST_OBJ, voidId, slot)
+            slot
+        } else {
+            null
+        }
+
+        val loopLabel = builder.label()
+        val continueLabel = builder.label()
+        val endLabel = builder.label()
+        builder.mark(loopLabel)
+
+        val hasNextSlot = allocSlot()
+        builder.emit(Opcode.CALL_MEMBER_SLOT, iterSlot, hasNextMethodId, 0, 0, hasNextSlot)
+        val condSlot = allocSlot()
+        builder.emit(Opcode.OBJ_TO_BOOL, hasNextSlot, condSlot)
+        builder.emit(
+            Opcode.JMP_IF_FALSE,
+            listOf(CmdBuilder.Operand.IntVal(condSlot), CmdBuilder.Operand.LabelRef(endLabel))
+        )
+
+        val nextSlot = allocSlot()
+        builder.emit(Opcode.CALL_MEMBER_SLOT, iterSlot, nextMethodId, 0, 0, nextSlot)
+        val nextObj = ensureObjSlot(CompiledValue(nextSlot, SlotType.UNKNOWN))
+        emitMove(CompiledValue(nextObj.slot, SlotType.OBJ), loopSlotId)
+        updateSlotType(loopSlotId, SlotType.OBJ)
+        updateSlotTypeByName(stmt.loopVarName, SlotType.OBJ)
+
+        loopStack.addLast(
+            LoopContext(
+                stmt.label,
+                endLabel,
+                continueLabel,
+                breakFlagSlot,
+                resultSlot,
+                hasIterator = true
+            )
+        )
+        val bodyValue = compileLoopBody(stmt.body, wantResult) ?: return null
+        if (hasRealWiden) {
+            applySlotTypes(realWidenSlots, SlotType.UNKNOWN)
+        }
+        loopStack.removeLast()
+        if (wantResult) {
+            val bodyObj = ensureObjSlot(bodyValue)
+            builder.emit(Opcode.MOVE_OBJ, bodyObj.slot, resultSlot!!)
+        }
+        builder.mark(continueLabel)
+        if (hasRealWiden) {
+            emitLoopRealCoercions(realWidenSlots)
+        }
+        builder.emit(Opcode.JMP, listOf(CmdBuilder.Operand.LabelRef(loopLabel)))
+
+        builder.mark(endLabel)
+        if (needsBreakFlag) {
+            val afterPop = builder.label()
+            builder.emit(
+                Opcode.JMP_IF_TRUE,
+                listOf(CmdBuilder.Operand.IntVal(breakFlagSlot), CmdBuilder.Operand.LabelRef(afterPop))
+            )
+            builder.emit(Opcode.ITER_POP)
+            builder.mark(afterPop)
+        } else {
+            builder.emit(Opcode.ITER_POP)
+        }
+        if (stmt.elseStatement != null) {
+            val afterElse = if (needsBreakFlag) builder.label() else null
+            if (needsBreakFlag) {
+                builder.emit(
+                    Opcode.JMP_IF_TRUE,
+                    listOf(CmdBuilder.Operand.IntVal(breakFlagSlot), CmdBuilder.Operand.LabelRef(afterElse!!))
+                )
+            }
+            val elseValue = compileStatementValueOrFallback(stmt.elseStatement, wantResult) ?: return null
+            if (wantResult) {
+                val elseObj = ensureObjSlot(elseValue)
+                builder.emit(Opcode.MOVE_OBJ, elseObj.slot, resultSlot!!)
+            }
+            if (needsBreakFlag) {
+                builder.mark(afterElse!!)
+            }
+        }
+        return resultSlot ?: breakFlagSlot
+    }
+
+    private fun emitRangeObject(startValue: CompiledValue, endValue: CompiledValue, ref: RangeRef): CompiledValue {
+        val startObj = ensureObjSlot(startValue)
+        val endObj = ensureObjSlot(endValue)
+        val inclusiveSlot = allocSlot()
+        val inclusiveId = builder.addConst(BytecodeConst.Bool(ref.isEndInclusive))
+        builder.emit(Opcode.CONST_BOOL, inclusiveId, inclusiveSlot)
+        val descendingSlot = allocSlot()
+        val descendingId = builder.addConst(BytecodeConst.Bool(ref.isDescending))
+        builder.emit(Opcode.CONST_BOOL, descendingId, descendingSlot)
+        val stepSlot = allocSlot()
+        builder.emit(Opcode.CONST_NULL, stepSlot)
+        updateSlotType(stepSlot, SlotType.OBJ)
+        val dst = allocSlot()
+        builder.emit(Opcode.MAKE_RANGE, startObj.slot, endObj.slot, inclusiveSlot, descendingSlot, stepSlot, dst)
+        updateSlotType(dst, SlotType.OBJ)
+        slotObjClass[dst] = ObjRange.type
+        return CompiledValue(dst, SlotType.OBJ)
+    }
+
+    private fun isDynamicIntRangeCandidate(ref: RangeRef): Boolean {
+        val left = ref.left ?: return false
+        val right = ref.right ?: return false
+        return isIntLikeRef(left) && isIntLikeRef(right)
+    }
+
+    private fun isIntLikeRef(ref: ObjRef): Boolean {
+        if (inferNumericKind(ref) == NumericKind.INT) {
+            return true
+        }
+        return when (ref) {
+            is ConstRef -> ref.constValue is ObjInt
+            is LocalSlotRef,
+            is LocalVarRef,
+            is FastLocalVarRef,
+            is BoundLocalVarRef,
+            is CallRef,
+            is MethodCallRef,
+            is FieldRef,
+            is CastRef,
+            is StatementRef -> resolveReceiverClass(ref) == ObjInt.type
+            is ThisMethodSlotCallRef,
+            is ImplicitThisMethodCallRef,
+            is ThisFieldSlotRef,
+            is ImplicitThisMemberRef -> resolveReceiverClassForScopeCollection(ref) == ObjInt.type
+            is UnaryOpRef -> ref.op == UnaryOp.NEGATE && isIntLikeRef(unaryOperand(ref))
+            is BinaryOpRef -> when (binaryOp(ref)) {
+                BinOp.PLUS,
+                BinOp.MINUS,
+                BinOp.STAR,
+                BinOp.SLASH,
+                BinOp.PERCENT,
+                BinOp.BAND,
+                BinOp.BXOR,
+                BinOp.BOR,
+                BinOp.SHL,
+                BinOp.SHR -> isIntLikeRef(binaryLeft(ref)) && isIntLikeRef(binaryRight(ref))
+                else -> false
+            }
+            else -> false
+        }
+    }
+
+    private fun coerceToLoopInt(value: CompiledValue): CompiledValue? {
+        return when (value.type) {
+            SlotType.INT -> value
+            SlotType.OBJ -> {
+                val isExactInt = isExactNonNullSlotClassOrTemp(value.slot, ObjInt.type)
+                val isStableIntObj = slotObjClass[value.slot] == ObjInt.type && isStablePrimitiveSourceSlot(value.slot)
+                if (!isExactInt && !isStableIntObj && !isStablePrimitiveSourceSlot(value.slot)) return null
+                val objSlot = if (isExactInt || isStableIntObj) {
+                    value.slot
+                } else {
+                    val boxed = allocSlot()
+                    builder.emit(Opcode.BOX_OBJ, value.slot, boxed)
+                    updateSlotType(boxed, SlotType.OBJ)
+                    emitAssertObjSlotIsInt(boxed)
+                }
+                val intSlot = allocSlot()
+                builder.emit(Opcode.UNBOX_INT_OBJ, objSlot, intSlot)
+                updateSlotType(intSlot, SlotType.INT)
+                CompiledValue(intSlot, SlotType.INT)
+            }
+            SlotType.UNKNOWN -> {
+                if (!isStablePrimitiveSourceSlot(value.slot)) return null
+                val boxed = allocSlot()
+                builder.emit(Opcode.BOX_OBJ, value.slot, boxed)
+                updateSlotType(boxed, SlotType.OBJ)
+                val checked = emitAssertObjSlotIsInt(boxed)
+                val intSlot = allocSlot()
+                builder.emit(Opcode.UNBOX_INT_OBJ, checked, intSlot)
+                updateSlotType(intSlot, SlotType.INT)
+                CompiledValue(intSlot, SlotType.INT)
+            }
+            else -> null
+        }
+    }
+
+    private fun coerceToArithmeticInt(ref: ObjRef, value: CompiledValue): CompiledValue? {
+        if (value.type == SlotType.INT) return value
+        val refSuggestsInt = inferNumericKind(ref) == NumericKind.INT
+        val stableNonTemp = !isTempSlot(value.slot) && isStablePrimitiveSourceSlot(value.slot)
+        if (!refSuggestsInt && !stableNonTemp) return null
+        return coerceToLoopInt(value)
+    }
+
+    private fun emitAssertObjSlotIsInt(slot: Int): Int {
+        val typeId = builder.addConst(BytecodeConst.ObjRef(ObjInt.type))
+        val typeSlot = allocSlot()
+        builder.emit(Opcode.CONST_OBJ, typeId, typeSlot)
+        builder.emit(Opcode.ASSERT_IS, slot, typeSlot)
+        return slot
    }

    private fun extractDeclaredRange(stmt: Statement?): RangeRef? {
@@ -314,8 +314,13 @@ class CmdUnboxIntObj(internal val src: Int, internal val dst: Int) : Cmd() {
 class CmdUnboxIntObjLocal(internal val src: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val value = frame.frame.getRawObj(src) as ObjInt
-        frame.setLocalInt(dst, value.value)
+        when (frame.frame.getSlotTypeCode(src)) {
+            SlotType.INT.code -> frame.setLocalInt(dst, frame.frame.getInt(src))
+            else -> {
+                val value = frame.frame.getRawObj(src) as ObjInt
+                frame.setLocalInt(dst, value.value)
+            }
+        }
        return
    }
 }
@@ -331,8 +336,13 @@ class CmdUnboxRealObj(internal val src: Int, internal val dst: Int) : Cmd() {
 class CmdUnboxRealObjLocal(internal val src: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val value = frame.frame.getRawObj(src) as ObjReal
-        frame.setLocalReal(dst, value.value)
+        when (frame.frame.getSlotTypeCode(src)) {
+            SlotType.REAL.code -> frame.setLocalReal(dst, frame.frame.getReal(src))
+            else -> {
+                val value = frame.frame.getRawObj(src) as ObjReal
+                frame.setLocalReal(dst, value.value)
+            }
+        }
        return
    }
 }
@@ -1540,9 +1550,15 @@ class CmdCmpEqIntObj(internal val a: Int, internal val b: Int, internal val dst:
 class CmdCmpEqIntObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjInt
-        val right = frame.frame.getRawObj(b) as ObjInt
-        frame.setLocalBool(dst, left.value == right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.INT.code -> frame.frame.getInt(a)
+            else -> (frame.frame.getRawObj(a) as ObjInt).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.INT.code -> frame.frame.getInt(b)
+            else -> (frame.frame.getRawObj(b) as ObjInt).value
+        }
+        frame.setLocalBool(dst, left == right)
        return
    }
 }
@@ -1563,9 +1579,15 @@ class CmdCmpNeqIntObj(internal val a: Int, internal val b: Int, internal val dst
 class CmdCmpNeqIntObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjInt
-        val right = frame.frame.getRawObj(b) as ObjInt
-        frame.setLocalBool(dst, left.value != right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.INT.code -> frame.frame.getInt(a)
+            else -> (frame.frame.getRawObj(a) as ObjInt).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.INT.code -> frame.frame.getInt(b)
+            else -> (frame.frame.getRawObj(b) as ObjInt).value
+        }
+        frame.setLocalBool(dst, left != right)
        return
    }
 }
@@ -1586,9 +1608,15 @@ class CmdCmpLtIntObj(internal val a: Int, internal val b: Int, internal val dst:
 class CmdCmpLtIntObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjInt
-        val right = frame.frame.getRawObj(b) as ObjInt
-        frame.setLocalBool(dst, left.value < right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.INT.code -> frame.frame.getInt(a)
+            else -> (frame.frame.getRawObj(a) as ObjInt).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.INT.code -> frame.frame.getInt(b)
+            else -> (frame.frame.getRawObj(b) as ObjInt).value
+        }
+        frame.setLocalBool(dst, left < right)
        return
    }
 }
@@ -1609,9 +1637,15 @@ class CmdCmpLteIntObj(internal val a: Int, internal val b: Int, internal val dst
 class CmdCmpLteIntObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjInt
-        val right = frame.frame.getRawObj(b) as ObjInt
-        frame.setLocalBool(dst, left.value <= right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.INT.code -> frame.frame.getInt(a)
+            else -> (frame.frame.getRawObj(a) as ObjInt).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.INT.code -> frame.frame.getInt(b)
+            else -> (frame.frame.getRawObj(b) as ObjInt).value
+        }
+        frame.setLocalBool(dst, left <= right)
        return
    }
 }
@@ -1632,9 +1666,15 @@ class CmdCmpGtIntObj(internal val a: Int, internal val b: Int, internal val dst:
 class CmdCmpGtIntObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjInt
-        val right = frame.frame.getRawObj(b) as ObjInt
-        frame.setLocalBool(dst, left.value > right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.INT.code -> frame.frame.getInt(a)
+            else -> (frame.frame.getRawObj(a) as ObjInt).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.INT.code -> frame.frame.getInt(b)
+            else -> (frame.frame.getRawObj(b) as ObjInt).value
+        }
+        frame.setLocalBool(dst, left > right)
        return
    }
 }
@@ -1655,9 +1695,15 @@ class CmdCmpGteIntObj(internal val a: Int, internal val b: Int, internal val dst
 class CmdCmpGteIntObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjInt
-        val right = frame.frame.getRawObj(b) as ObjInt
-        frame.setLocalBool(dst, left.value >= right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.INT.code -> frame.frame.getInt(a)
+            else -> (frame.frame.getRawObj(a) as ObjInt).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.INT.code -> frame.frame.getInt(b)
+            else -> (frame.frame.getRawObj(b) as ObjInt).value
+        }
+        frame.setLocalBool(dst, left >= right)
        return
    }
 }
@@ -1678,9 +1724,15 @@ class CmdCmpEqRealObj(internal val a: Int, internal val b: Int, internal val dst
 class CmdCmpEqRealObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjReal
-        val right = frame.frame.getRawObj(b) as ObjReal
-        frame.setLocalBool(dst, left.value == right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.REAL.code -> frame.frame.getReal(a)
+            else -> (frame.frame.getRawObj(a) as ObjReal).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.REAL.code -> frame.frame.getReal(b)
+            else -> (frame.frame.getRawObj(b) as ObjReal).value
+        }
+        frame.setLocalBool(dst, left == right)
        return
    }
 }
@@ -1701,9 +1753,15 @@ class CmdCmpNeqRealObj(internal val a: Int, internal val b: Int, internal val ds
 class CmdCmpNeqRealObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjReal
-        val right = frame.frame.getRawObj(b) as ObjReal
-        frame.setLocalBool(dst, left.value != right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.REAL.code -> frame.frame.getReal(a)
+            else -> (frame.frame.getRawObj(a) as ObjReal).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.REAL.code -> frame.frame.getReal(b)
+            else -> (frame.frame.getRawObj(b) as ObjReal).value
+        }
+        frame.setLocalBool(dst, left != right)
        return
    }
 }
@@ -1724,9 +1782,15 @@ class CmdCmpLtRealObj(internal val a: Int, internal val b: Int, internal val dst
 class CmdCmpLtRealObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjReal
-        val right = frame.frame.getRawObj(b) as ObjReal
-        frame.setLocalBool(dst, left.value < right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.REAL.code -> frame.frame.getReal(a)
+            else -> (frame.frame.getRawObj(a) as ObjReal).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.REAL.code -> frame.frame.getReal(b)
+            else -> (frame.frame.getRawObj(b) as ObjReal).value
+        }
+        frame.setLocalBool(dst, left < right)
        return
    }
 }
@@ -1747,9 +1811,15 @@ class CmdCmpLteRealObj(internal val a: Int, internal val b: Int, internal val ds
 class CmdCmpLteRealObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjReal
-        val right = frame.frame.getRawObj(b) as ObjReal
-        frame.setLocalBool(dst, left.value <= right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.REAL.code -> frame.frame.getReal(a)
+            else -> (frame.frame.getRawObj(a) as ObjReal).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.REAL.code -> frame.frame.getReal(b)
+            else -> (frame.frame.getRawObj(b) as ObjReal).value
+        }
+        frame.setLocalBool(dst, left <= right)
        return
    }
 }
@@ -1770,9 +1840,15 @@ class CmdCmpGtRealObj(internal val a: Int, internal val b: Int, internal val dst
 class CmdCmpGtRealObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjReal
-        val right = frame.frame.getRawObj(b) as ObjReal
-        frame.setLocalBool(dst, left.value > right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.REAL.code -> frame.frame.getReal(a)
+            else -> (frame.frame.getRawObj(a) as ObjReal).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.REAL.code -> frame.frame.getReal(b)
+            else -> (frame.frame.getRawObj(b) as ObjReal).value
+        }
+        frame.setLocalBool(dst, left > right)
        return
    }
 }
@@ -1793,9 +1869,15 @@ class CmdCmpGteRealObj(internal val a: Int, internal val b: Int, internal val ds
 class CmdCmpGteRealObjLocal(internal val a: Int, internal val b: Int, internal val dst: Int) : Cmd() {
    override val isFast: Boolean = true
    override fun performFast(frame: CmdFrame) {
-        val left = frame.frame.getRawObj(a) as ObjReal
-        val right = frame.frame.getRawObj(b) as ObjReal
-        frame.setLocalBool(dst, left.value >= right.value)
+        val left = when (frame.frame.getSlotTypeCode(a)) {
+            SlotType.REAL.code -> frame.frame.getReal(a)
+            else -> (frame.frame.getRawObj(a) as ObjReal).value
+        }
+        val right = when (frame.frame.getSlotTypeCode(b)) {
+            SlotType.REAL.code -> frame.frame.getReal(b)
+            else -> (frame.frame.getRawObj(b) as ObjReal).value
+        }
+        frame.setLocalBool(dst, left >= right)
        return
    }
 }
@@ -3624,7 +3706,13 @@ class CmdGetIndex(
    internal val dst: Int,
 ) : Cmd() {
    override suspend fun perform(frame: CmdFrame) {
-        val result = frame.slotToObj(targetSlot).getAt(frame.ensureScope(), frame.slotToObj(indexSlot))
+        val target = frame.storedSlotObj(targetSlot)
+        val index = frame.storedSlotObj(indexSlot)
+        if (target is ObjList && target::class == ObjList::class && index is ObjInt) {
+            frame.storeObjResult(dst, target.list[index.toInt()])
+            return
+        }
+        val result = target.getAt(frame.ensureScope(), index)
        frame.storeObjResult(dst, result)
        return
    }
@@ -3636,7 +3724,14 @@ class CmdSetIndex(
    internal val valueSlot: Int,
 ) : Cmd() {
    override suspend fun perform(frame: CmdFrame) {
-        frame.slotToObj(targetSlot).putAt(frame.ensureScope(), frame.slotToObj(indexSlot), frame.slotToObj(valueSlot))
+        val target = frame.storedSlotObj(targetSlot)
+        val index = frame.storedSlotObj(indexSlot)
+        val value = frame.slotToObj(valueSlot)
+        if (target is ObjList && target::class == ObjList::class && index is ObjInt) {
+            target.list[index.toInt()] = value
+            return
+        }
+        target.putAt(frame.ensureScope(), index, value)
        return
    }
 }
@@ -0,0 +1,145 @@
+/*
+ * 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.BytecodeBodyProvider
+import net.sergeych.lyng.PerfFlags
+import net.sergeych.lyng.PerfProfiles
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.Statement
+import net.sergeych.lyng.bytecode.BytecodeStatement
+import net.sergeych.lyng.bytecode.CmdCallMemberSlot
+import net.sergeych.lyng.bytecode.CmdFunction
+import net.sergeych.lyng.bytecode.CmdGetIndex
+import net.sergeych.lyng.bytecode.CmdIterPush
+import net.sergeych.lyng.bytecode.CmdMakeRange
+import net.sergeych.lyng.bytecode.CmdSetIndex
+import net.sergeych.lyng.obj.ObjString
+import java.nio.file.Files
+import java.nio.file.Path
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+import kotlin.time.TimeSource
+
+class PiSpigotBenchmarkTest {
+    @Test
+    fun benchmarkPiSpigot() = runTest {
+        if (!Benchmarks.enabled) return@runTest
+
+        val source = Files.readString(resolveExample("pi-test.lyng"))
+        val legacySource = source.replace(
+            "val quotient = sum / denom",
+            "var quotient = floor((sum / (denom * 1.0))).toInt()"
+        )
+        assertTrue(legacySource != source, "failed to build legacy piSpigot benchmark case")
+
+        val digits = 200
+        val expectedSuffix = "49303819"
+
+        val legacyElapsed = runCase("legacy-real-division", legacySource, digits, expectedSuffix, dumpBytecode = true)
+        val saved = PerfProfiles.snapshot()
+        PerfFlags.RVAL_FASTPATH = false
+        val optimizedRvalOffElapsed = runCase(
+            "optimized-int-division-rval-off",
+            source,
+            digits,
+            expectedSuffix,
+            dumpBytecode = false
+        )
+        PerfProfiles.restore(saved)
+        val optimizedElapsed = runCase("optimized-int-division-rval-on", source, digits, expectedSuffix, dumpBytecode = true)
+        val sourceSpeedup = legacyElapsed.toDouble() / optimizedRvalOffElapsed.toDouble()
+        val runtimeSpeedup = optimizedRvalOffElapsed.toDouble() / optimizedElapsed.toDouble()
+        val totalSpeedup = legacyElapsed.toDouble() / optimizedElapsed.toDouble()
+        println(
+            "[DEBUG_LOG] [BENCH] pi-spigot compare n=$digits legacy=${legacyElapsed} ms " +
+                "intDiv=${optimizedRvalOffElapsed} ms rvalOn=${optimizedElapsed} ms " +
+                "intDivSpeedup=${"%.2f".format(sourceSpeedup)}x " +
+                "rvalSpeedup=${"%.2f".format(runtimeSpeedup)}x " +
+                "total=${"%.2f".format(totalSpeedup)}x"
+        )
+    }
+
+    private suspend fun runCase(
+        name: String,
+        source: String,
+        digits: Int,
+        expectedSuffix: String,
+        dumpBytecode: Boolean,
+    ): Long {
+        val scope = Script.newScope()
+        scope.eval(source)
+
+        if (dumpBytecode) {
+            println("[DEBUG_LOG] [BENCH] pi-spigot cmd:\n${scope.disassembleSymbol("piSpigot")}")
+            dumpHotOps(scope, "piSpigot")
+        }
+
+        val first = scope.eval("piSpigot($digits)") as ObjString
+        assertEquals(expectedSuffix, first.value)
+
+        repeat(2) {
+            val warm = scope.eval("piSpigot($digits)") as ObjString
+            assertEquals(expectedSuffix, warm.value)
+        }
+
+        val iterations = 3
+        val start = TimeSource.Monotonic.markNow()
+        repeat(iterations) {
+            val result = scope.eval("piSpigot($digits)") as ObjString
+            assertEquals(expectedSuffix, result.value)
+        }
+        val elapsedMs = start.elapsedNow().inWholeMilliseconds
+        val avgMs = elapsedMs.toDouble() / iterations.toDouble()
+        println(
+            "[DEBUG_LOG] [BENCH] pi-spigot $name n=$digits iterations=$iterations " +
+                "elapsed=${elapsedMs} ms avg=${"%.2f".format(avgMs)} ms"
+        )
+        return elapsedMs
+    }
+
+    private fun dumpHotOps(scope: net.sergeych.lyng.Scope, name: String) {
+        val fn = resolveBytecodeFunction(scope, name) ?: return
+        val makeRange = fn.cmds.count { it is CmdMakeRange }
+        val callMemberSlot = fn.cmds.count { it is CmdCallMemberSlot }
+        val iterPush = fn.cmds.count { it is CmdIterPush }
+        val getIndex = fn.cmds.count { it is CmdGetIndex }
+        val setIndex = fn.cmds.count { it is CmdSetIndex }
+        println(
+            "[DEBUG_LOG] [BENCH] pi-spigot hot-ops " +
+                "makeRange=$makeRange callMemberSlot=$callMemberSlot iterPush=$iterPush " +
+                "getIndex=$getIndex setIndex=$setIndex total=${fn.cmds.size}"
+        )
+    }
+
+    private fun resolveBytecodeFunction(scope: net.sergeych.lyng.Scope, name: String): CmdFunction? {
+        val record = scope.get(name) ?: return null
+        val stmt = record.value as? Statement ?: return null
+        return (stmt as? BytecodeStatement)?.bytecodeFunction()
+            ?: (stmt as? BytecodeBodyProvider)?.bytecodeBody()?.bytecodeFunction()
+    }
+
+    private fun resolveExample(name: String): Path {
+        val direct = Path.of("examples", name)
+        if (Files.exists(direct)) return direct
+        val parent = Path.of("..", "examples", name)
+        if (Files.exists(parent)) return parent
+        error("example not found: $name")
+    }
+}