diff --git a/mix-object.ts b/mix-object.ts
new file mode 100644
index 0000000..084b002
--- /dev/null
+++ b/mix-object.ts
@@ -0,0 +1,150 @@
+/**
+ * Binary search the first bad object in object sets.
+ * Things todo:
+ *   1. Determine the set of vector, or scalar version.
+ *   2. Use the mechanism above, construct such set
+ *   3. Link the set to an executable -> SPEC path, invoke "runcpu"
+ */
+
+import { binSearch } from "./algorithm";
+import { pop2, defaultSPEC, SPEC, Bench, mkBench } from "./spec";
+import path from "path";
+import { FLANG, PREFIX, SYSROOT_PREFIX } from "./environment";
+import { generalCommand, linkerCommand } from "./commands/compiler";
+import { runcpuOptions } from "./commands/spec";
+import { renderConfig } from "./spec";
+import { checkedSpawnSync } from "./cli";
+import { systemdRunOptions } from "./commands/systemd";
+
+export interface Linkable {
+    link: (objectPath: (objectNames: string[]) => string[]) => Promise<void>;
+}
+
+function mkPop2Bench(spec: SPEC): Bench & Linkable {
+    const base = mkBench(spec, pop2);
+    return {
+        ...base,
+        async link(objectPath) {
+            // Set up environment variables.
+            // FIXME: use -rpath or -rpath-link after I find out why.
+            const linkenv = { ...process.env };
+            linkenv.LD_LIBRARY_PATH = [
+                path.join(PREFIX, 'lib'),
+                path.join(SYSROOT_PREFIX, 'lib'),
+                path.join(SYSROOT_PREFIX, 'usr', 'lib')
+            ].join(':');
+
+            const objects = objectPath(base.benchData().objectNames);
+
+            const options = [
+                ...objects,
+                ...linkerCommand({
+                    searchDirs: [path.join(PREFIX, "lib"),],
+                }),
+                ...generalCommand({
+                    output: base.exepath(),
+                    outputKind: "exe",
+                    sysroot: SYSROOT_PREFIX,
+                }),
+            ];
+
+            // Execute the link command
+            const proc = checkedSpawnSync(FLANG, options, {
+                stdio: "inherit",
+                env: linkenv,
+            });
+
+            if (proc.error) {
+                throw proc.error;
+            }
+        },
+    };
+}
+
+
+async function main() {
+    const spec = defaultSPEC;
+
+    // Path to SPEC2017 test suite.
+    spec.setenv();
+
+
+    // Just use scalar vanilla version of grid, will it work?
+    //
+    // No, does not work.
+    const useVectorGrid = (object: string) => object !== "grid.fppized.o";
+
+    const length = pop2.objectNames.length;
+
+
+    const beforeHalf = [
+        // Empty: /home/lyc/workspace/sw-autovec/spec2017/result/CPU2017.664.fpspeed.refspeed.txt
+        // 0.336
+        false,
+    ];
+
+    const [vBegin, vHalf, vEnd] = binSearch(0, length, beforeHalf);
+
+
+    //  use scalar version if index is in this range.
+    const scalarRange = [
+        [0, length / 2],
+        [length / 2, length],
+    ];
+
+    const useVectors = scalarRange.map(([a, b]) => ({
+        useVector: (_: string, index: number) => {
+            // If index is not in range [a, b), use the vector version.
+            return !(a <= index && index < b);
+        },
+        range: [a, b],
+    }));
+
+    // Linking each "useVector" instances in sequence
+    for (const { useVector: predicate, range } of useVectors) {
+        const buildPathObj = (build: string) => (objname: string) => path.join(spec.buildpath(pop2), build, objname);
+        const vector = buildPathObj("build_vector");
+        const scalar = buildPathObj("build_scalar_vanilla");
+
+        const pop2Bench = mkPop2Bench(spec);
+
+        console.log(`Linking objects. Range in [${range[0]}, ${range[1]}) used scalar version. others are vector version.`);
+
+        await pop2Bench.link(names =>
+            names.map((obj, index) =>
+                predicate(obj, index) ? vector(obj) : scalar(obj)));
+
+        const config = "clang-O2.cfg";
+
+        const serviceName = `${pop2Bench.benchData().num}-${range[0]}-${range[1]}`;
+
+        // Render the config if necessary.
+        if (false) {
+            await spec.newConfig(config, renderConfig({
+                gccdir: PREFIX,
+                optimize: "-O2",
+            }));
+        }
+
+        checkedSpawnSync("systemd-run",
+            [
+                ...systemdRunOptions({
+                    scope: false,
+                    unit: `spec-${serviceName}`,
+                    user: true,
+                }),
+                "runcpu",
+                ...runcpuOptions({
+                    benchmarks: [pop2Bench.benchData().num.toString()],
+                    config,
+                    workload: "ref",
+                    buildType: "nobuild",
+                    outputFormat: ["text", "config"]
+                }),
+            ], { stdio: "inherit" });
+
+    }
+
+}
+
+main();