3 files changed, 20 insertions, 3 deletions
diff --git a/test_ffi/tests/bench.js b/test_ffi/tests/bench.js
index e611d9f3c..54a9e0acc 100644
--- a/test_ffi/tests/bench.js
+++ b/test_ffi/tests/bench.js
@@ -272,12 +272,20 @@ Deno.bench("nop_i64()", () => {
 });
 
 const { nop_usize } = dylib.symbols;
-Deno.bench("nop_usize()", () => {
+Deno.bench("nop_usize() number", () => {
+  nop_usize(100);
+});
+
+Deno.bench("nop_usize() bigint", () => {
   nop_usize(100n);
 });
 
 const { nop_isize } = dylib.symbols;
-Deno.bench("nop_isize()", () => {
+Deno.bench("nop_isize() number", () => {
+  nop_isize(100);
+});
+
+Deno.bench("nop_isize() bigint", () => {
   nop_isize(100n);
 });
 
diff --git a/test_ffi/tests/integration_tests.rs b/test_ffi/tests/integration_tests.rs
index 4982ffad5..26de8ce0d 100644
--- a/test_ffi/tests/integration_tests.rs
+++ b/test_ffi/tests/integration_tests.rs
@@ -63,6 +63,8 @@ fn basic() {
     true\n\
     579\n\
     579\n\
+    5\n\
+    5\n\
     579\n\
     8589934590n\n\
     -8589934590n\n\
diff --git a/test_ffi/tests/test.js b/test_ffi/tests/test.js
index 4e05be3ed..ff81f302e 100644
--- a/test_ffi/tests/test.js
+++ b/test_ffi/tests/test.js
@@ -55,6 +55,7 @@ const dylib = Deno.dlopen(libPath, {
   "add_u64": { parameters: ["u64", "u64"], result: "u64" },
   "add_i64": { parameters: ["i64", "i64"], result: "i64" },
   "add_usize": { parameters: ["usize", "usize"], result: "usize" },
+  "add_usize_fast": { parameters: ["usize", "usize"], result: "u32" },
   "add_isize": { parameters: ["isize", "isize"], result: "isize" },
   "add_f32": { parameters: ["f32", "f32"], result: "f32" },
   "add_f64": { parameters: ["f64", "f64"], result: "f64" },
@@ -241,7 +242,7 @@ const before = performance.now();
 await sleepNonBlocking.call(100);
 console.log(performance.now() - before >= 100);
 
-const { add_u32 } = symbols;
+const { add_u32, add_usize_fast } = symbols;
 function addU32Fast(a, b) {
   return add_u32(a, b);
 };
@@ -251,6 +252,12 @@ console.log(addU32Fast(123, 456));
 %OptimizeFunctionOnNextCall(addU32Fast);
 console.log(addU32Fast(123, 456));
 
+function addU64Fast(a, b) { return add_usize_fast(a, b); };
+%PrepareFunctionForOptimization(addU64Fast);
+console.log(addU64Fast(2, 3));
+%OptimizeFunctionOnNextCall(addU64Fast);
+console.log(addU64Fast(2, 3));
+
 console.log(dylib.symbols.add_i32(123, 456));
 console.log(dylib.symbols.add_u64(0xffffffffn, 0xffffffffn));
 console.log(dylib.symbols.add_i64(-0xffffffffn, -0xffffffffn));