2.5-18.1

math/w_pow.c

@@ -0,0 +1,70 @@
+
+
+/* @(#)w_pow.c 5.2 93/10/01 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * wrapper pow(x,y) return x**y
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+
+#ifdef __STDC__
+	double __pow(double x, double y)	/* wrapper pow */
+#else
+	double __pow(x,y)			/* wrapper pow */
+	double x,y;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return  __ieee754_pow(x,y);
+#else
+	double z;
+	z=__ieee754_pow(x,y);
+	if(_LIB_VERSION == _IEEE_|| __isnan(y)) return z;
+	if(__isnan(x)) {
+	    if(y==0.0)
+	        return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
+	    else
+		return z;
+	}
+	if(x==0.0) {
+	    if(y==0.0)
+	        return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
+	    if(__finite(y)&&y<0.0) {
+	      if (signbit (x) && signbit (z))
+	        return __kernel_standard(x,y,23); /* pow(-0.0,negative) */
+	      else
+	        return __kernel_standard(x,y,43); /* pow(+0.0,negative) */
+	    }
+	    return z;
+	}
+	if(!__finite(z)) {
+	    if(__finite(x)&&__finite(y)) {
+	        if(__isnan(z))
+	            return __kernel_standard(x,y,24); /* pow neg**non-int */
+	        else
+	            return __kernel_standard(x,y,21); /* pow overflow */
+	    }
+	}
+	if(z==0.0&&__finite(x)&&__finite(y))
+	    return __kernel_standard(x,y,22); /* pow underflow */
+	return z;
+#endif
+}
+weak_alias (__pow, pow)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__pow, __powl)
+weak_alias (__pow, powl)
+#endif