1 files changed, 10 insertions, 0 deletions
diff --git a/src/math/fdim.c b/src/math/fdim.c
new file mode 100644
index 00000000..fb25521c
--- /dev/null
+++ b/src/math/fdim.c
@@ -0,0 +1,10 @@
+#include "libm.h"
+
+double fdim(double x, double y)
+{
+	if (isnan(x))
+		return x;
+	if (isnan(y))
+		return y;
+	return x > y ? x - y : 0;
+}