From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/math/copysign.c | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 src/math/copysign.c

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

diff --git a/src/math/copysign.c b/src/math/copysign.c
new file mode 100644
index 0000000..b09331b
--- /dev/null
+++ b/src/math/copysign.c
@@ -0,0 +1,8 @@
+#include "libm.h"
+
+double copysign(double x, double y) {
+	union {double f; uint64_t i;} ux={x}, uy={y};
+	ux.i &= -1ULL/2;
+	ux.i |= uy.i & 1ULL<<63;
+	return ux.f;
+}
-- 
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