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-rw-r--r--math/w_powf.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/math/w_powf.c b/math/w_powf.c
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+/* 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)