diff --git a/benchmark/case/ffi.expect b/benchmark/case/ffi.expect
new file mode 100644
index 00000000..d15ab7a1
--- /dev/null
+++ b/benchmark/case/ffi.expect
@@ -0,0 +1,87 @@
+final passInt32x8Doublex8Int64Int8Struct1ByteIntInt64IntLeaf = ffiTestFunctions
+    .lookupFunction<
+      Double Function(
+        Int32,
+        Int32,
+        Int32,
+        Int32,
+        Int32,
+        Int32,
+        Int32,
+        Int32,
+        Double,
+        Double,
+        Double,
+        Double,
+        Double,
+        Double,
+        Double,
+        Double,
+        Int64,
+        Int8,
+        Struct1ByteInt,
+        Int64,
+        Int8,
+        Struct4BytesHomogeneousInt16,
+        Int64,
+        Int8,
+        Struct8BytesInt,
+        Int64,
+        Int8,
+        Struct8BytesHomogeneousFloat,
+        Int64,
+        Int8,
+        Struct8BytesMixed,
+        Int64,
+        Int8,
+        StructAlignmentInt16,
+        Int64,
+        Int8,
+        StructAlignmentInt32,
+        Int64,
+        Int8,
+        StructAlignmentInt64,
+      ),
+      double Function(
+        int,
+        int,
+        int,
+        int,
+        int,
+        int,
+        int,
+        int,
+        double,
+        double,
+        double,
+        double,
+        double,
+        double,
+        double,
+        double,
+        int,
+        int,
+        Struct1ByteInt,
+        int,
+        int,
+        Struct4BytesHomogeneousInt16,
+        int,
+        int,
+        Struct8BytesInt,
+        int,
+        int,
+        Struct8BytesHomogeneousFloat,
+        int,
+        int,
+        Struct8BytesMixed,
+        int,
+        int,
+        StructAlignmentInt16,
+        int,
+        int,
+        StructAlignmentInt32,
+        int,
+        int,
+        StructAlignmentInt64,
+      )
+    >("PassInt32x8Doublex8Int64Int8Struct1ByteIntInt64Int", isLeaf: true);
diff --git a/benchmark/case/ffi.expect_short b/benchmark/case/ffi.expect_short
new file mode 100644
index 00000000..22201a97
--- /dev/null
+++ b/benchmark/case/ffi.expect_short
@@ -0,0 +1,84 @@
+final passInt32x8Doublex8Int64Int8Struct1ByteIntInt64IntLeaf =
+    ffiTestFunctions.lookupFunction<
+        Double Function(
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Int64,
+            Int8,
+            Struct1ByteInt,
+            Int64,
+            Int8,
+            Struct4BytesHomogeneousInt16,
+            Int64,
+            Int8,
+            Struct8BytesInt,
+            Int64,
+            Int8,
+            Struct8BytesHomogeneousFloat,
+            Int64,
+            Int8,
+            Struct8BytesMixed,
+            Int64,
+            Int8,
+            StructAlignmentInt16,
+            Int64,
+            Int8,
+            StructAlignmentInt32,
+            Int64,
+            Int8,
+            StructAlignmentInt64),
+        double Function(
+            int,
+            int,
+            int,
+            int,
+            int,
+            int,
+            int,
+            int,
+            double,
+            double,
+            double,
+            double,
+            double,
+            double,
+            double,
+            double,
+            int,
+            int,
+            Struct1ByteInt,
+            int,
+            int,
+            Struct4BytesHomogeneousInt16,
+            int,
+            int,
+            Struct8BytesInt,
+            int,
+            int,
+            Struct8BytesHomogeneousFloat,
+            int,
+            int,
+            Struct8BytesMixed,
+            int,
+            int,
+            StructAlignmentInt16,
+            int,
+            int,
+            StructAlignmentInt32,
+            int,
+            int,
+            StructAlignmentInt64)>("PassInt32x8Doublex8Int64Int8Struct1ByteIntInt64Int", isLeaf: true);
diff --git a/benchmark/case/ffi.unit b/benchmark/case/ffi.unit
new file mode 100644
index 00000000..22201a97
--- /dev/null
+++ b/benchmark/case/ffi.unit
@@ -0,0 +1,84 @@
+final passInt32x8Doublex8Int64Int8Struct1ByteIntInt64IntLeaf =
+    ffiTestFunctions.lookupFunction<
+        Double Function(
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Int32,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Double,
+            Int64,
+            Int8,
+            Struct1ByteInt,
+            Int64,
+            Int8,
+            Struct4BytesHomogeneousInt16,
+            Int64,
+            Int8,
+            Struct8BytesInt,
+            Int64,
+            Int8,
+            Struct8BytesHomogeneousFloat,
+            Int64,
+            Int8,
+            Struct8BytesMixed,
+            Int64,
+            Int8,
+            StructAlignmentInt16,
+            Int64,
+            Int8,
+            StructAlignmentInt32,
+            Int64,
+            Int8,
+            StructAlignmentInt64),
+        double Function(
+            int,
+            int,
+            int,
+            int,
+            int,
+            int,
+            int,
+            int,
+            double,
+            double,
+            double,
+            double,
+            double,
+            double,
+            double,
+            double,
+            int,
+            int,
+            Struct1ByteInt,
+            int,
+            int,
+            Struct4BytesHomogeneousInt16,
+            int,
+            int,
+            Struct8BytesInt,
+            int,
+            int,
+            Struct8BytesHomogeneousFloat,
+            int,
+            int,
+            Struct8BytesMixed,
+            int,
+            int,
+            StructAlignmentInt16,
+            int,
+            int,
+            StructAlignmentInt32,
+            int,
+            int,
+            StructAlignmentInt64)>("PassInt32x8Doublex8Int64Int8Struct1ByteIntInt64Int", isLeaf: true);