1 files changed, 38 insertions, 0 deletions
diff --git a/src/runtime/internal/sys/intrinsics_test.go b/src/runtime/internal/sys/intrinsics_test.go
new file mode 100644
index 0000000..bf75f19
--- /dev/null
+++ b/src/runtime/internal/sys/intrinsics_test.go
@@ -0,0 +1,38 @@
+package sys_test
+
+import (
+	"runtime/internal/sys"
+	"testing"
+)
+
+func TestTrailingZeros64(t *testing.T) {
+	for i := 0; i <= 64; i++ {
+		x := uint64(5) << uint(i)
+		if got := sys.TrailingZeros64(x); got != i {
+			t.Errorf("TrailingZeros64(%d)=%d, want %d", x, got, i)
+		}
+	}
+}
+func TestTrailingZeros32(t *testing.T) {
+	for i := 0; i <= 32; i++ {
+		x := uint32(5) << uint(i)
+		if got := sys.TrailingZeros32(x); got != i {
+			t.Errorf("TrailingZeros32(%d)=%d, want %d", x, got, i)
+		}
+	}
+}
+
+func TestBswap64(t *testing.T) {
+	x := uint64(0x1122334455667788)
+	y := sys.Bswap64(x)
+	if y != 0x8877665544332211 {
+		t.Errorf("Bswap(%x)=%x, want 0x8877665544332211", x, y)
+	}
+}
+func TestBswap32(t *testing.T) {
+	x := uint32(0x11223344)
+	y := sys.Bswap32(x)
+	if y != 0x44332211 {
+		t.Errorf("Bswap(%x)=%x, want 0x44332211", x, y)
+	}
+}