1 files changed, 16 insertions, 0 deletions
diff --git a/src/math/copysignl.c b/src/math/copysignl.c
new file mode 100644
index 00000000..72a21488
--- /dev/null
+++ b/src/math/copysignl.c
@@ -0,0 +1,16 @@
+#include "libm.h"
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long double copysignl(long double x, long double y)
+{
+	return copysign(x, y);
+}
+#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
+long double copysignl(long double x, long double y)
+{
+	union ldshape ux = {x}, uy = {y};
+
+	ux.bits.sign = uy.bits.sign;
+	return ux.value;
+}
+#endif