1 files changed, 27 insertions, 0 deletions
diff --git a/lib/libm/frexp.c b/lib/libm/frexp.c
new file mode 100644
index 00000000..1148c7e9
--- /dev/null
+++ b/lib/libm/frexp.c
@@ -0,0 +1,27 @@
+#include <math.h>
+#include <stdint.h>
+
+double frexp(double x, int *e)
+{
+	union {
+		double d;
+		uint64_t i;
+	} y = { x };
+	int ee = y.i >> 52 & 0x7ff;
+
+	if (!ee) {
+		if (x) {
+			x = frexp(x * 0x1p64, e);
+			*e -= 64;
+		} else
+			*e = 0;
+		return x;
+	} else if (ee == 0x7ff) {
+		return x;
+	}
+
+	*e = ee - 0x3fe;
+	y.i &= 0x800fffffffffffffull;
+	y.i |= 0x3fe0000000000000ull;
+	return y.d;
+}