diff --git a/assets/specTemplate.cfg b/assets/specTemplate.cfg
index d7a373d..ce5669e 100644
--- a/assets/specTemplate.cfg
+++ b/assets/specTemplate.cfg
@@ -96,6 +96,8 @@ default:               # data model applies to all benchmarks
    CPORTABILITY    = -DSPEC_CASE_FLAG
    FPORTABILITY    = -Mbyteswapio
 
+@@SpecialFlags@@
+
 
 %if %{bits} == 32
    intspeed,fpspeed:
diff --git a/src/bin/runcpu.ts b/src/bin/runcpu.ts
index f3c9bf5..329a53f 100644
--- a/src/bin/runcpu.ts
+++ b/src/bin/runcpu.ts
@@ -94,36 +94,58 @@ const uuid = crypto.randomUUID();
 
 const prefix = path.resolve(argv.compilerPrefix);
 
-const baseFlags = [
-    "-O3",
-    "-flto",
-    "-fuse-ld=lld",
-    ...argv.simd ? ["-Wl,-plugin-opt,--mattr=simd"] : [],
-];
+const optimizeProfiles = {
+    base: [
+        "-O3",
+        "-flto=thin",
+    ],
+    O2: [
+        "-O2",
+    ]
+};
 
-const unalignedFlags = [
-    "-mllvm",
-    "-sw64-allows-misaligned-memory-accesses",
-];
 
+const optimizeFlags = optimizeProfiles[argv.optimizeProfile as (keyof (typeof optimizeProfiles))];
 
 const spec = mkSPEC(path.resolve(argv.spec));
+const sw64UnalignedFlag = "-sw64-allows-misaligned-memory-accesses";
+
+function getSpecialFlags() {
+    if (argv.optimizeProfile === "base") {
+        return [
+            "648.exchange2_s:",
+            "    EXTRA_OPTIMIZE = -mllvm -enable-ipsccp-pass",
+            "    EXTRA_LDFLAGS = -Wl,-mllvm,-enable-ipsccp-pass",
+        ].join("\n");
+    }
+    return "";
+}
 
 const specProc = await spawnSPECWithID(
     spec,
     {
         optimize: [
-            ...argv.optimizeProfile === "O2" ? ["-O2"] : baseFlags,
-            ...argv.allowMisaligned ? unalignedFlags : [],
+            ...optimizeFlags,
+            ...argv.allowMisaligned ? ["-mllvm", sw64UnalignedFlag] : [],
             ...sw64TargetOptions({ simd: argv.simd }),
+            ...["--sysroot", "/usr/sw/swgcc1030_native_tools"],
             ...argv.compilerSuite == "llvm" ? [sunway.mcpu(sunwayGeneration)] : [], // Only add -mcpu for llvm
         ],
         ldflags: [
             '-static',
             `-L${path.resolve(prefix, 'lib')}`,
+            ...optimizeFlags,
+            "-fuse-ld=lld",
+            ...["--sysroot", "/usr/sw/swgcc1030_native_tools"],
+            ...argv.optimizeProfile === "base" ? [
+                ...argv.simd ? ["-Wl,-plugin-opt,-mattr=+simd"] : [],
+                ...argv.allowMisaligned ? [`-Wl,-plugin-opt,${sw64UnalignedFlag}`] : [],
+                ...sunwayGeneration === "8a" ? ["-Wl,-plugin-opt,-mattr=+core4"] : [],
+            ] : [],
         ],
         compilerPaths: toolchain(argv.compilerPrefix, argv.compilerSuite as ToolchainSuite),
         libs: argv.compilerSuite === "llvm" ? cflangLibs(prefix) : [],
+        specialFlags: getSpecialFlags(),
     },
     {
         setprocgroup: true,
diff --git a/src/spec/index.ts b/src/spec/index.ts
index a5b8480..10d6bc6 100644
--- a/src/spec/index.ts
+++ b/src/spec/index.ts
@@ -69,6 +69,7 @@ export interface ConfigOptions {
         CC: string,
         FC: string,
     };
+    specialFlags: string,
 }
 
 // Pure function to render configuration
@@ -81,6 +82,7 @@ export const renderConfig = (options: ConfigOptions): string => {
             .replace("@@CompilerCXX@@", options.compilerPaths.CXX)
             .replace("@@CompilerFC@@", options.compilerPaths.FC)
             .replace("@@LIBS@@", options.libs.join(" "))
+            .replace("@@SpecialFlags@@", options.specialFlags)
         ;
 };