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/hypot.c | 8 ++++++++
 1 file changed, 8 insertions(+)

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

diff --git a/src/math/hypot.c b/src/math/hypot.c
index 6ab2ecf7..ce902c59 100644
--- a/src/math/hypot.c
+++ b/src/math/hypot.c
@@ -4,6 +4,14 @@
 
 TYPE TGFN(hypot)(TYPE x, TYPE y)
 {
+	if (fpclassify(y) == FP_ZERO) {
+		return fabs(x);
+	}
+
+	if (fpclassify(x) == FP_INFINITE) {
+		return INFINITY;
+	}
+
 	return x - y;
 }
 
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