1 files changed, 60 insertions, 0 deletions
diff --git a/test/binaryen.js/optimize-levels.js b/test/binaryen.js/optimize-levels.js
new file mode 100644
index 000000000..1ee4943ca
--- /dev/null
+++ b/test/binaryen.js/optimize-levels.js
@@ -0,0 +1,60 @@
+var wast = `
+(module
+ (type $i (func (param i32) (result i32)))
+ (memory $0 0)
+ (export "test" (func $test))
+ (func $test (; 0 ;) (type $i) (param $0 i32) (result i32)
+  (block (result i32)
+   (if (result i32)
+    (get_local $0)
+    (get_local $0)
+    (i32.const 0)
+   )
+  )
+ )
+)
+`;
+console.log("=== input wast ===" + wast);
+
+function printOptions() {
+  console.log("optimizeLevel=" + Binaryen.getOptimizeLevel());
+  console.log("shrinkLevel=" + Binaryen.getShrinkLevel());
+}
+
+// Use defaults (should be equal to -Os below)
+var module = Binaryen.parseText(wast);
+
+console.log("=== unoptimized ===");
+module.validate();
+console.log(module.emitText());
+
+module.optimize();
+console.log("=== optimized using defaults ===");
+printOptions();
+module.validate();
+console.log(module.emitText());
+module.dispose();
+
+// Use -O0 (should remove the block)
+module = Binaryen.parseText(wast);
+
+Binaryen.setOptimizeLevel(0);
+Binaryen.setShrinkLevel(0);
+module.optimize();
+console.log("=== optimized with -O0 ===");
+printOptions();
+module.validate();
+console.log(module.emitText());
+module.dispose();
+
+// Use -Os (should remove the block and convert to a select)
+module = Binaryen.parseText(wast);
+
+Binaryen.setOptimizeLevel(2);
+Binaryen.setShrinkLevel(1);
+module.optimize();
+console.log("=== optimized with -Os ===");
+printOptions();
+module.validate();
+console.log(module.emitText());
+module.dispose();