From 51c4c4716a0e54b4e0a0c5c9f7c27db1572329be Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 9 Jan 2024 07:59:42 +0900
Subject: [PATCH] mruby-math: use `log1p(x)` instead of `log(1.0+x)`

---
 mrbgems/mruby-math/src/math.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-math/src/math.c b/mrbgems/mruby-math/src/math.c
index 26a6eaa40..76ee57481 100644
--- a/mrbgems/mruby-math/src/math.c
+++ b/mrbgems/mruby-math/src/math.c
@@ -74,7 +74,7 @@ atanh(double x)
   }
   else {
     /* Basic formula for atanh */
-    y = 0.5 * (log(1.0+x) - log(1.0-x));
+    y = 0.5 * (log1p(x) - log1p(-x));
   }
 
   return y;