import newlib-2000-02-17 snapshot

1 files changed, 103 insertions, 0 deletions

diff --git a/newlib/libm/math/wf_exp.c b/newlib/libm/math/wf_exp.c
new file mode 100644
index 0000000..70f4459
--- /dev/null
+++ b/newlib/libm/math/wf_exp.c
@@ -0,0 +1,103 @@
+/* wf_exp.c -- float version of w_exp.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 expf(x)
+ */
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifdef __STDC__
+static const float
+#else
+static float
+#endif
+o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
+u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
+
+#ifdef __STDC__
+	float expf(float x)		/* wrapper expf */
+#else
+	float expf(x)			/* wrapper expf */
+	float x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_expf(x);
+#else
+	float z;
+	struct exception exc;
+	z = __ieee754_expf(x);
+	if(_LIB_VERSION == _IEEE_) return z;
+	if(finitef(x)) {
+	    if(x>o_threshold) {
+		/* expf(finite) overflow */
+#ifndef HUGE_VAL
+#define HUGE_VAL inf
+	        double inf = 0.0;
+
+	        SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
+#endif
+		exc.type = OVERFLOW;
+		exc.name = "expf";
+		exc.err = 0;
+		exc.arg1 = exc.arg2 = (double)x;
+		if (_LIB_VERSION == _SVID_)
+		  exc.retval = HUGE;
+		else
+		  exc.retval = HUGE_VAL;
+		if (_LIB_VERSION == _POSIX_)
+		  errno = ERANGE;
+		else if (!matherr(&exc)) {
+			errno = ERANGE;
+		}
+	        if (exc.err != 0)
+	           errno = exc.err;
+	        return exc.retval; 
+	    } else if(x<u_threshold) {
+		/* expf(finite) underflow */
+		exc.type = UNDERFLOW;
+		exc.name = "expf";
+		exc.err = 0;
+		exc.arg1 = exc.arg2 = (double)x;
+		exc.retval = 0.0;
+		if (_LIB_VERSION == _POSIX_)
+		  errno = ERANGE;
+		else if (!matherr(&exc)) {
+			errno = ERANGE;
+		}
+	        if (exc.err != 0)
+	           errno = exc.err;
+	        return exc.retval; 
+	    } 
+	} 
+	return z;
+#endif
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double exp(double x)
+#else
+	double exp(x)
+	double x;
+#endif
+{
+	return (double) expf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */