1 files changed, 14 insertions, 0 deletions
diff --git a/src/math/__fpclassify.c b/src/math/__fpclassify.c
new file mode 100644
index 0000000..1605110
--- /dev/null
+++ b/src/math/__fpclassify.c
@@ -0,0 +1,14 @@
+#include <stdint.h>
+#include <math.h>
+
+int __fpclassify(double __x)
+{
+	union {
+		double __d;
+		__uint64_t __i;
+	} __y = { __x };
+	int __ee = __y.__i>>52 & 0x7ff;
+	if (!__ee) return __y.__i<<1 ? FP_SUBNORMAL : FP_ZERO;
+	if (__ee==0x7ff) return __y.__i<<12 ? FP_NAN : FP_INFINITE;
+	return FP_NORMAL;
+}