3 files changed, 44 insertions, 1 deletions
diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index 64304421c..e164c0312 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -3822,7 +3822,7 @@ void BinaryenFunctionOptimize(BinaryenFunctionRef func,
                               BinaryenModuleRef module) {
   PassRunner passRunner((Module*)module);
   passRunner.options = globalPassOptions;
-  passRunner.addDefaultOptimizationPasses();
+  passRunner.addDefaultFunctionOptimizationPasses();
   passRunner.runOnFunction((Function*)func);
 }
 void BinaryenFunctionRunPasses(BinaryenFunctionRef func,
diff --git a/test/example/c-api-kitchen-sink.c b/test/example/c-api-kitchen-sink.c
index a8aa05c4a..8a2f22e8d 100644
--- a/test/example/c-api-kitchen-sink.c
+++ b/test/example/c-api-kitchen-sink.c
@@ -1365,6 +1365,31 @@ void test_for_each() {
   BinaryenModuleDispose(module);
 }
 
+void test_func_opt() {
+  BinaryenModuleRef module = BinaryenModuleCreate();
+  BinaryenType ii_[2] = {BinaryenTypeInt32(), BinaryenTypeInt32()};
+  BinaryenType ii = BinaryenTypeCreate(ii_, 2);
+  BinaryenExpressionRef x = BinaryenConst(module, BinaryenLiteralInt32(1)),
+                        y = BinaryenConst(module, BinaryenLiteralInt32(3));
+  BinaryenExpressionRef add = BinaryenBinary(module, BinaryenAddInt32(), x, y);
+  BinaryenFunctionRef adder = BinaryenAddFunction(
+    module, "adder", BinaryenTypeNone(), BinaryenTypeInt32(), NULL, 0, add);
+
+  puts("module with a function to optimize:");
+  BinaryenModulePrint(module);
+
+  assert(BinaryenModuleValidate(module));
+
+  BinaryenFunctionOptimize(adder, module);
+
+  assert(BinaryenModuleValidate(module));
+
+  puts("optimized:");
+  BinaryenModulePrint(module);
+
+  BinaryenModuleDispose(module);
+}
+
 int main() {
   test_types();
   test_features();
@@ -1376,6 +1401,7 @@ int main() {
   test_nonvalid();
   test_color_status();
   test_for_each();
+  test_func_opt();
 
   return 0;
 }
diff --git a/test/example/c-api-kitchen-sink.txt b/test/example/c-api-kitchen-sink.txt
index 0e85ac18a..723d81999 100644
--- a/test/example/c-api-kitchen-sink.txt
+++ b/test/example/c-api-kitchen-sink.txt
@@ -2450,3 +2450,20 @@ validation: 0
   (nop)
  )
 )
+module with a function to optimize:
+(module
+ (type $none_=>_i32 (func (result i32)))
+ (func $adder (result i32)
+  (i32.add
+   (i32.const 1)
+   (i32.const 3)
+  )
+ )
+)
+optimized:
+(module
+ (type $none_=>_i32 (func (result i32)))
+ (func $adder (result i32)
+  (i32.const 4)
+ )
+)