From 04c0f8eec752d1afe09c0b7e0b72f027ce4ee4d0 Mon Sep 17 00:00:00 2001
From: Jacob Lifshay <programmerjake@gmail.com>
Date: Thu, 6 May 2021 19:40:31 -0700
Subject: [PATCH] add test_ilogb_f16

---
 src/algorithms/ilogb.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/algorithms/ilogb.rs b/src/algorithms/ilogb.rs
index 2956c8f..86b5a10 100644
--- a/src/algorithms/ilogb.rs
+++ b/src/algorithms/ilogb.rs
@@ -94,6 +94,27 @@ mod tests {
     use super::*;
     use crate::scalar::Scalar;
 
+    #[test]
+    #[cfg_attr(
+        not(feature = "f16"),
+        should_panic(expected = "f16 feature is not enabled")
+    )]
+    fn test_ilogb_f16() {
+        fn ilogb(arg: f32) -> i16 {
+            let arg: F16 = arg.to();
+            ilogb_f16(Scalar, arg)
+        }
+        assert_eq!(ilogb(0.), ILOGB_UNDERFLOW_RESULT_F16);
+        assert_eq!(ilogb(1.), 0);
+        assert_eq!(ilogb(2.), 1);
+        assert_eq!(ilogb(3.), 1);
+        assert_eq!(ilogb(3.998), 1);
+        assert_eq!(ilogb(0.5), -1);
+        assert_eq!(ilogb(0.5f32.powi(20)), -20);
+        assert_eq!(ilogb(f32::INFINITY), ILOGB_OVERFLOW_RESULT_F16);
+        assert_eq!(ilogb(f32::NAN), ILOGB_NAN_RESULT_F16);
+    }
+
     #[test]
     fn test_ilogb_f32() {
         assert_eq!(ilogb_f32(Scalar, 0f32), ILOGB_UNDERFLOW_RESULT_F32);
-- 
2.30.2