1 files changed, 16 insertions, 0 deletions
diff --git a/lib/libm/__fpclassify.c b/lib/libm/__fpclassify.c
new file mode 100644
index 00000000..41332adf
--- /dev/null
+++ b/lib/libm/__fpclassify.c
@@ -0,0 +1,16 @@
+#include <math.h>
+#include <stdint.h>
+
+int __fpclassify(double x)
+{
+	union {
+		double f;
+		uint64_t i;
+	} u = { x };
+	int e = u.i >> 52 & 0x7ff;
+	if (!e)
+		return u.i << 1 ? FP_SUBNORMAL : FP_ZERO;
+	if (e == 0x7ff)
+		return u.i << 12 ? FP_NAN : FP_INFINITE;
+	return FP_NORMAL;
+}