From 06696f40afe58a231e2531c8bf6d9f0dadb92e51 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Sun, 3 Mar 2019 21:25:50 -0500
Subject: outline details from C18 annex F

---
 src/math/exp2.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/math/exp2.c')

diff --git a/src/math/exp2.c b/src/math/exp2.c
index 599634e6..16ff5940 100644
--- a/src/math/exp2.c
+++ b/src/math/exp2.c
@@ -4,6 +4,12 @@
 
 TYPE TGFN(exp2)(TYPE x)
 {
+	switch (fpclassify(x)) {
+	case FP_ZERO:		return 1.0;
+	case FP_INFINITE:	return signbit(x) ? 0.0 : x;
+	default:		break;
+	}
+
 	return x;
 }
 
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