From 871cd306c58c356c710115193bb4b906d099b5a0 Mon Sep 17 00:00:00 2001
From: Yingwei Zheng <dtcxzyw2333@gmail.com>
Date: Wed, 31 Jul 2024 20:34:15 +0800
Subject: [PATCH] libm/copysign: respect signed zero/NaN in copysign

---
 libs/libm/libm/lib_copysign.c  | 2 +-
 libs/libm/libm/lib_copysignl.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libs/libm/libm/lib_copysign.c b/libs/libm/libm/lib_copysign.c
index f0b6c8ad3b..171b476aaa 100644
--- a/libs/libm/libm/lib_copysign.c
+++ b/libs/libm/libm/lib_copysign.c
@@ -34,7 +34,7 @@
 #ifdef CONFIG_HAVE_DOUBLE
 double copysign(double x, double y)
 {
-  if (y < 0)
+  if (signbit(y))
     {
       return -fabs(x);
     }
diff --git a/libs/libm/libm/lib_copysignl.c b/libs/libm/libm/lib_copysignl.c
index 58d3a32067..824403904d 100644
--- a/libs/libm/libm/lib_copysignl.c
+++ b/libs/libm/libm/lib_copysignl.c
@@ -34,7 +34,7 @@
 #ifdef CONFIG_HAVE_LONG_DOUBLE
 long double copysignl(long double x, long double y)
 {
-  if (y < 0)
+  if (signbit(y))
     {
       return -fabsl(x);
     }