Generic w_pow.c.
authordrepper <drepper>
Wed, 14 Dec 2005 11:53:02 +0000 (11:53 +0000)
committerdrepper <drepper>
Wed, 14 Dec 2005 11:53:02 +0000 (11:53 +0000)
math/w_pow.c [new file with mode: 0644]

diff --git a/math/w_pow.c b/math/w_pow.c
new file mode 100644 (file)
index 0000000..707cffc
--- /dev/null
@@ -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