initial check-in, version 0.5.0 v0.5.0

1 files changed, 30 insertions, 0 deletions

diff --git a/src/math/s_copysign.c b/src/math/s_copysign.c
new file mode 100644
index 00000000..59d3877c
--- /dev/null
+++ b/src/math/s_copysign.c
@@ -0,0 +1,30 @@
+/* @(#)s_copysign.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * copysign(double x, double y)
+ * copysign(x,y) returns a value with the magnitude of x and
+ * with the sign bit of y.
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+double
+copysign(double x, double y)
+{
+        uint32_t hx,hy;
+        GET_HIGH_WORD(hx,x);
+        GET_HIGH_WORD(hy,y);
+        SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
+        return x;
+}