diff --git a/apps/tests/phase118_loop_nested_if_merge_min.hako b/apps/tests/phase118_loop_nested_if_merge_min.hako
new file mode 100644
index 00000000..436d08a9
--- /dev/null
+++ b/apps/tests/phase118_loop_nested_if_merge_min.hako
@@ -0,0 +1,18 @@
+// Phase 118: loop + if-only merge parity test
+// Expected output: 2 (numeric line)
+// Calculation: i=0: x=0 (skip), i=1: x=0+1→1, i=2: x=1+1→2
+
+static box Main {
+    main() {
+        local i = 0
+        local x = 0
+        loop(i < 3) {
+            if i > 0 {
+                x = x + 1
+            }
+            i = i + 1
+        }
+        print(x)
+        return "OK"
+    }
+}
diff --git a/apps/tests/phase118_pattern3_if_sum_min.hako b/apps/tests/phase118_pattern3_if_sum_min.hako
new file mode 100644
index 00000000..acab1c48
--- /dev/null
+++ b/apps/tests/phase118_pattern3_if_sum_min.hako
@@ -0,0 +1,34 @@
+// Phase 118: Pattern3 (if-sum) carrier merge regression
+// Expected output: 12 (numeric line)
+//
+// Shape:
+// - loop(i < 3)
+// - if-only conditional update on carrier `sum`
+// - loop var `i` + non-loop carrier `sum`
+//
+// Computation:
+//   sum=10
+//   i=0: if false → sum += 0
+//   i=1: if true  → sum += 1
+//   i=2: if true  → sum += 1
+//   => sum=12
+
+static box Main {
+    main() {
+        local sum = 10
+        local i = 0
+
+        loop(i < 3) {
+            if i > 0 {
+                sum = sum + 1
+            } else {
+                sum = sum + 0
+            }
+            i = i + 1
+        }
+
+        print(sum)
+        return "OK"
+    }
+}
+
diff --git a/tools/smokes/v2/profiles/integration/apps/phase118_loop_nested_if_merge_llvm_exe.sh b/tools/smokes/v2/profiles/integration/apps/phase118_loop_nested_if_merge_llvm_exe.sh
new file mode 100644
index 00000000..9036b66d
--- /dev/null
+++ b/tools/smokes/v2/profiles/integration/apps/phase118_loop_nested_if_merge_llvm_exe.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+# Phase 118: loop + if-else merge parity (LLVM EXE)
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/llvm_exe_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+llvm_exe_preflight_or_skip || exit 0
+
+# Phase 97/98/100 SSOT: plugin dlopen check → build only if needed → dlopen recheck.
+FILEBOX_SO="$NYASH_ROOT/plugins/nyash-filebox-plugin/libnyash_filebox_plugin.so"
+MAPBOX_SO="$NYASH_ROOT/plugins/nyash-map-plugin/libnyash_map_plugin.so"
+STRINGBOX_SO="$NYASH_ROOT/plugins/nyash-string-plugin/libnyash_string_plugin.so"
+CONSOLEBOX_SO="$NYASH_ROOT/plugins/nyash-console-plugin/libnyash_console_plugin.so"
+INTEGERBOX_SO="$NYASH_ROOT/plugins/nyash-integer-plugin/libnyash_integer_plugin.so"
+
+LLVM_REQUIRED_PLUGINS=(
+  "FileBox|$FILEBOX_SO|nyash-filebox-plugin"
+  "MapBox|$MAPBOX_SO|nyash-map-plugin"
+  "StringBox|$STRINGBOX_SO|nyash-string-plugin"
+  "ConsoleBox|$CONSOLEBOX_SO|nyash-console-plugin"
+  "IntegerBox|$INTEGERBOX_SO|nyash-integer-plugin"
+)
+LLVM_PLUGIN_BUILD_LOG="/tmp/phase118_loop_nested_if_merge_plugin_build.log"
+llvm_exe_ensure_plugins_or_fail || exit 1
+
+INPUT_HAKO="$NYASH_ROOT/apps/tests/phase118_loop_nested_if_merge_min.hako"
+OUTPUT_EXE="$NYASH_ROOT/tmp/phase118_loop_nested_if_merge_llvm_exe"
+
+EXPECTED='2'
+EXPECTED_LINES=1
+LLVM_BUILD_LOG="/tmp/phase118_loop_nested_if_merge_build.log"
+if llvm_exe_build_and_run_numeric_smoke; then
+  test_pass "phase118_loop_nested_if_merge_llvm_exe: output matches expected (2)"
+else
+  exit 1
+fi
diff --git a/tools/smokes/v2/profiles/integration/apps/phase118_loop_nested_if_merge_vm.sh b/tools/smokes/v2/profiles/integration/apps/phase118_loop_nested_if_merge_vm.sh
new file mode 100644
index 00000000..f32c42e3
--- /dev/null
+++ b/tools/smokes/v2/profiles/integration/apps/phase118_loop_nested_if_merge_vm.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../../../lib/output_validator.sh"
+
+FIXTURE="apps/tests/phase118_loop_nested_if_merge_min.hako"
+
+echo "[phase118_loop_nested_if_merge_vm] Testing loop + if-else merge parity (VM)..."
+
+# VM execution with STRICT mode
+OUTPUT=$(NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1 ./target/release/hakorune --backend vm "$FIXTURE" 2>&1) || {
+    echo "❌ VM execution failed"
+    echo "$OUTPUT"
+    exit 1
+}
+
+# Validate: expect 1 line with value 2
+validate_numeric_output 1 "2" "$OUTPUT"
+
+echo "✅ [phase118_loop_nested_if_merge_vm] PASS"
diff --git a/tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_llvm_exe.sh b/tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_llvm_exe.sh
new file mode 100644
index 00000000..0e4147aa
--- /dev/null
+++ b/tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_llvm_exe.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+# Phase 118: Pattern3 carrier merge regression (LLVM EXE)
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/llvm_exe_runner.sh"
+source "$(dirname "$0")/../../../lib/output_validator.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+llvm_exe_preflight_or_skip || exit 0
+
+FILEBOX_SO="$NYASH_ROOT/plugins/nyash-filebox-plugin/libnyash_filebox_plugin.so"
+MAPBOX_SO="$NYASH_ROOT/plugins/nyash-map-plugin/libnyash_map_plugin.so"
+STRINGBOX_SO="$NYASH_ROOT/plugins/nyash-string-plugin/libnyash_string_plugin.so"
+CONSOLEBOX_SO="$NYASH_ROOT/plugins/nyash-console-plugin/libnyash_console_plugin.so"
+INTEGERBOX_SO="$NYASH_ROOT/plugins/nyash-integer-plugin/libnyash_integer_plugin.so"
+
+LLVM_REQUIRED_PLUGINS=(
+  "FileBox|$FILEBOX_SO|nyash-filebox-plugin"
+  "MapBox|$MAPBOX_SO|nyash-map-plugin"
+  "StringBox|$STRINGBOX_SO|nyash-string-plugin"
+  "ConsoleBox|$CONSOLEBOX_SO|nyash-console-plugin"
+  "IntegerBox|$INTEGERBOX_SO|nyash-integer-plugin"
+)
+LLVM_PLUGIN_BUILD_LOG="/tmp/phase118_pattern3_if_sum_plugin_build.log"
+llvm_exe_ensure_plugins_or_fail || exit 1
+
+INPUT_HAKO="$NYASH_ROOT/apps/tests/phase118_pattern3_if_sum_min.hako"
+OUTPUT_EXE="$NYASH_ROOT/tmp/phase118_pattern3_if_sum_llvm_exe"
+
+EXPECTED='12'
+EXPECTED_LINES=1
+LLVM_BUILD_LOG="/tmp/phase118_pattern3_if_sum_build.log"
+if llvm_exe_build_and_run_numeric_smoke; then
+  test_pass "phase118_pattern3_if_sum_llvm_exe: output matches expected (12)"
+else
+  exit 1
+fi
+
diff --git a/tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_vm.sh b/tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_vm.sh
new file mode 100644
index 00000000..57ca815a
--- /dev/null
+++ b/tools/smokes/v2/profiles/integration/apps/phase118_pattern3_if_sum_vm.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+# Phase 118: Pattern3 carrier merge regression (VM)
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/output_validator.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-10}
+
+INPUT="$NYASH_ROOT/apps/tests/phase118_pattern3_if_sum_min.hako"
+EXPECTED="12"
+
+echo "[INFO] Phase 118: Pattern3 if-sum carrier merge (VM) - $INPUT"
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env \
+  NYASH_DISABLE_PLUGINS=1 \
+  HAKO_JOINIR_STRICT=1 \
+  "$NYASH_BIN" --backend vm "$INPUT" 2>&1)
+EXIT_CODE=$?
+set -e
+
+if [ "$EXIT_CODE" -eq 124 ]; then
+  test_fail "phase118_pattern3_if_sum_vm: hakorune timed out (>${RUN_TIMEOUT_SECS}s)"
+  exit 1
+fi
+
+if [ "$EXIT_CODE" -ne 0 ]; then
+  echo "[FAIL] hakorune failed with exit code $EXIT_CODE"
+  echo "[INFO] output (tail):"
+  echo "$OUTPUT" | tail -n 80 || true
+  test_fail "phase118_pattern3_if_sum_vm: execution failed"
+  exit 1
+fi
+
+if validate_numeric_output 1 "$EXPECTED" "$OUTPUT"; then
+  test_pass "phase118_pattern3_if_sum_vm: output matches expected (12)"
+  exit 0
+fi
+
+echo "[INFO] output (tail):"
+echo "$OUTPUT" | tail -n 80 || true
+test_fail "phase118_pattern3_if_sum_vm: output mismatch"
+exit 1
+