import newlib-2000-02-17 snapshot

1 files changed, 179 insertions, 0 deletions

diff --git a/newlib/libm/math/wf_pow.c b/newlib/libm/math/wf_pow.c
new file mode 100644
index 000000000..42655da4a
--- /dev/null
+++ b/newlib/libm/math/wf_pow.c
@@ -0,0 +1,179 @@
+/* wf_pow.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.
+ * ====================================================
+ */
+
+/* 
+ * wrapper powf(x,y) return x**y
+ */
+
+#include "fdlibm.h"
+#include <errno.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;
+	struct exception exc;
+	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) */
+		/* error only if _LIB_VERSION == _SVID_ & _XOPEN_ */
+		exc.type = DOMAIN;
+		exc.name = "powf";
+		exc.err = 0;
+		exc.arg1 = (double)x;
+		exc.arg2 = (double)y;
+		exc.retval = x;
+		if (_LIB_VERSION == _IEEE_ ||
+		    _LIB_VERSION == _POSIX_) exc.retval = 1.0;
+		else if (!matherr(&exc)) {
+			errno = EDOM;
+		}
+	        if (exc.err != 0)
+	           errno = exc.err;
+                return (float)exc.retval; 
+	    } else 
+		return z;
+	}
+	if(x==(float)0.0){ 
+	    if(y==(float)0.0) {
+		/* powf(0.0,0.0) */
+		/* error only if _LIB_VERSION == _SVID_ */
+		exc.type = DOMAIN;
+		exc.name = "powf";
+		exc.err = 0;
+		exc.arg1 = (double)x;
+		exc.arg2 = (double)y;
+		exc.retval = 0.0;
+		if (_LIB_VERSION != _SVID_) exc.retval = 1.0;
+		else if (!matherr(&exc)) {
+			errno = EDOM;
+		}
+	        if (exc.err != 0)
+	           errno = exc.err;
+                return (float)exc.retval; 
+	    }
+	    if(finitef(y)&&y<(float)0.0) {
+		/* 0**neg */
+		exc.type = DOMAIN;
+		exc.name = "powf";
+		exc.err = 0;
+		exc.arg1 = (double)x;
+		exc.arg2 = (double)y;
+		if (_LIB_VERSION == _SVID_) 
+		  exc.retval = 0.0;
+		else
+		  exc.retval = -HUGE_VAL;
+		if (_LIB_VERSION == _POSIX_)
+		  errno = EDOM;
+		else if (!matherr(&exc)) {
+		  errno = EDOM;
+		}
+	        if (exc.err != 0)
+	           errno = exc.err;
+                return (float)exc.retval; 
+            }
+	    return z;
+	}
+	if(!finitef(z)) {
+	    if(finitef(x)&&finitef(y)) {
+	        if(isnanf(z)) {
+		    /* neg**non-integral */
+		    exc.type = DOMAIN;
+		    exc.name = "powf";
+		    exc.err = 0;
+		    exc.arg1 = (double)x;
+		    exc.arg2 = (double)y;
+		    if (_LIB_VERSION == _SVID_) 
+		        exc.retval = 0.0;
+		    else 
+		        exc.retval = 0.0/0.0;	/* X/Open allow NaN */
+		    if (_LIB_VERSION == _POSIX_) 
+		        errno = EDOM;
+		    else if (!matherr(&exc)) {
+		        errno = EDOM;
+		    }
+	            if (exc.err != 0)
+	                errno = exc.err;
+                    return (float)exc.retval; 
+	        } else {
+		    /* powf(x,y) overflow */
+		    exc.type = OVERFLOW;
+		    exc.name = "powf";
+		    exc.err = 0;
+		    exc.arg1 = (double)x;
+		    exc.arg2 = (double)y;
+		    if (_LIB_VERSION == _SVID_) {
+		       exc.retval = HUGE;
+		       y *= 0.5;
+		       if(x<0.0&&rint(y)!=y) exc.retval = -HUGE;
+		    } else {
+		       exc.retval = HUGE_VAL;
+                       y *= 0.5;
+		       if(x<0.0&&rint(y)!=y) exc.retval = -HUGE_VAL;
+		    }
+		    if (_LIB_VERSION == _POSIX_)
+		        errno = ERANGE;
+		    else if (!matherr(&exc)) {
+			errno = ERANGE;
+		    }
+	            if (exc.err != 0)
+	                errno = exc.err;
+                    return (float)exc.retval; 
+                }
+	    }
+	} 
+	if(z==(float)0.0&&finitef(x)&&finitef(y)) {
+	    /* powf(x,y) underflow */
+	    exc.type = UNDERFLOW;
+	    exc.name = "powf";
+	    exc.err = 0;
+	    exc.arg1 = (double)x;
+	    exc.arg2 = (double)y;
+	    exc.retval =  0.0;
+	    if (_LIB_VERSION == _POSIX_)
+	        errno = ERANGE;
+	    else if (!matherr(&exc)) {
+	     	errno = ERANGE;
+	    }
+	    if (exc.err != 0)
+	        errno = exc.err;
+            return (float)exc.retval; 
+        }
+	return z;
+#endif
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double pow(double x, double y)
+#else
+	double pow(x,y)
+	double x,y;
+#endif
+{
+	return (double) powf((float) x, (float) y);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */