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-rw-r--r--src/math/fdim.c10
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;
+}