2.5-18.1

math/w_powf.c

@@ -0,0 +1,77 @@
+/* w_powf.c -- float version of w_pow.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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: w_powf.c,v 1.3 1995/05/10 20:49:41 jtc Exp $";
+#endif
+
+/*
+ * wrapper powf(x,y) return x**y
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+
+#ifdef __STDC__
+	float __powf(float x, float y)	/* wrapper powf */
+#else
+	float __powf(x,y)			/* wrapper powf */
+	float x,y;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return  __ieee754_powf(x,y);
+#else
+	float z;
+	z=__ieee754_powf(x,y);
+	if(_LIB_VERSION == _IEEE_|| __isnanf(y)) return z;
+	if(__isnanf(x)) {
+	    if(y==(float)0.0)
+	        /* powf(NaN,0.0) */
+	        return (float)__kernel_standard((double)x,(double)y,142);
+	    else
+		return z;
+	}
+	if(x==(float)0.0) {
+	    if(y==(float)0.0)
+	        /* powf(0.0,0.0) */
+	        return (float)__kernel_standard((double)x,(double)y,120);
+	    if(__finitef(y)&&y<(float)0.0) {
+	      if (signbit (x) && signbit (z))
+	        /* powf(0.0,negative) */
+	        return (float)__kernel_standard((double)x,(double)y,123);
+	      else
+	        return (float)__kernel_standard((double)x,(double)y,143);
+	    }
+	    return z;
+	}
+	if(!__finitef(z)) {
+	    if(__finitef(x)&&__finitef(y)) {
+	        if(__isnanf(z))
+		    /* powf neg**non-int */
+	            return (float)__kernel_standard((double)x,(double)y,124);
+	        else
+		    /* powf overflow */
+	            return (float)__kernel_standard((double)x,(double)y,121);
+	    }
+	}
+	if(z==(float)0.0&&__finitef(x)&&__finitef(y))
+	    /* powf underflow */
+	    return (float)__kernel_standard((double)x,(double)y,122);
+	return z;
+#endif
+}
+weak_alias (__powf, powf)