altos: Add floating point math functions from newlib

These are all BSD licensed, so we can simply include them directly

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/math/sf_copysign.c b/src/math/sf_copysign.c
new file mode 100644
index 00000000..f547c82e
--- /dev/null
+++ b/src/math/sf_copysign.c
@@ -0,0 +1,50 @@
+/* sf_copysign.c -- float version of s_copysign.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * copysignf(float x, float y)
+ * copysignf(x,y) returns a value with the magnitude of x and
+ * with the sign bit of y.
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+	float copysignf(float x, float y)
+#else
+	float copysignf(x,y)
+	float x,y;
+#endif
+{
+	__uint32_t ix,iy;
+	GET_FLOAT_WORD(ix,x);
+	GET_FLOAT_WORD(iy,y);
+	SET_FLOAT_WORD(x,(ix&0x7fffffff)|(iy&0x80000000));
+        return x;
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double copysign(double x, double y)
+#else
+	double copysign(x,y)
+	double x,y;
+#endif
+{
+	return (double) copysignf((float) x, (float) y);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */