1 files changed, 12 insertions, 0 deletions
diff --git a/v_windows/v/vlib/math/q_rsqrt.v b/v_windows/v/vlib/math/q_rsqrt.v
new file mode 100644
index 0000000..570d3a3
--- /dev/null
+++ b/v_windows/v/vlib/math/q_rsqrt.v
@@ -0,0 +1,12 @@
+module math
+
+[inline]
+pub fn q_rsqrt(x f64) f64 {
+	x_half := 0.5 * x
+	mut i := i64(f64_bits(x))
+	i = 0x5fe6eb50c7b537a9 - (i >> 1)
+	mut j := f64_from_bits(u64(i))
+	j *= (1.5 - x_half * j * j)
+	j *= (1.5 - x_half * j * j)
+	return j
+}