diff --git a/misc/tcc_zerosign.c b/misc/tcc_zerosign1.c
similarity index 100%
rename from misc/tcc_zerosign.c
rename to misc/tcc_zerosign1.c
diff --git a/misc/tcc_zerosign2.c b/misc/tcc_zerosign2.c
new file mode 100644
index 00000000..4e49caff
--- /dev/null
+++ b/misc/tcc_zerosign2.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <math.h>
+int main(int argc, char *argv[]) {
+  double d = 0.0;
+  printf("signbit: %d\n", signbit(d));
+  d = -d;
+  printf("signbit: %d\n", signbit(d));
+}
+