diff --git a/src/commands/compiler.ts b/src/commands/compiler.ts
index a3649d3..3fe58c6 100644
--- a/src/commands/compiler.ts
+++ b/src/commands/compiler.ts
@@ -1,11 +1,37 @@
 import { optFlag, optMultiFlag, optSwitch, undefList } from "./common";
 
 export interface GeneralOptions {
-    output?: string
+    output?: string;
 
-    sysroot?: string
+    sysroot?: string;
 
-    outputKind?: "exe" | "object" | "assembly" | "preprocessed"
+    outputKind?: "exe" | "object" | "assembly" | "preprocessed";
+}
+
+export interface Sw64TargetOptions {
+    simd?: boolean;
+}
+
+export function sw64TargetOptions(o: Sw64TargetOptions) {
+    return [
+        ...optSwitch("-msimd", o.simd)
+    ];
+}
+
+/**
+ * Options That Control Optimization.
+ * https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
+ */
+export interface OptimizeOptions {
+    optimize?: "1" | "2" | "3" | "0" | "s" | "fast" | "g" | "z";
+}
+
+export function optimizeOptions(o: OptimizeOptions) {
+    return [
+        ...undefList(o.optimize, optimize => {
+            return [`-O${optimize}`];
+        })
+    ];
 }
 
 export function generalCommand(options: GeneralOptions) {
@@ -14,17 +40,17 @@ export function generalCommand(options: GeneralOptions) {
         ...undefList(options.outputKind, (opt) => {
             switch (opt) {
                 case "object":
-                    return ["-c"]
+                    return ["-c"];
                 case "exe":
-                    return []
+                    return [];
                 case "assembly":
-                    return ["-S"]
+                    return ["-S"];
                 case "preprocessed":
-                    return ["-E"]
+                    return ["-E"];
             }
         }),
         ...optFlag("--sysroot", options.sysroot),
-    ]
+    ];
 }
 
 interface LinkerOptions {
@@ -44,7 +70,7 @@ export function linkerCommand(options: LinkerOptions) {
     return [
         ...optMultiFlag("-L", options.searchDirs),
         ...optMultiFlag("-l", options.libraries),
-    ]
+    ];
 }
 
 export interface PreprocessorOptions {
@@ -54,7 +80,7 @@ export interface PreprocessorOptions {
 export function preprocessorCommand(options: PreprocessorOptions) {
     return [
         ...optMultiFlag("-I", options.includeDirs),
-    ]
+    ];
 }