import newlib-2000-02-17 snapshotcvs/SNAPSHOT

1 files changed, 85 insertions, 0 deletions

diff --git a/newlib/libm/math/wf_log.c b/newlib/libm/math/wf_log.c
new file mode 100644
index 00000000000..cd373b402e5
--- /dev/null
+++ b/newlib/libm/math/wf_log.c
@@ -0,0 +1,85 @@
+/* wf_log.c -- float version of w_log.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 logf(x)
+ */
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifdef __STDC__
+	float logf(float x)		/* wrapper logf */
+#else
+	float logf(x)			/* wrapper logf */
+	float x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_logf(x);
+#else
+	float z;
+	struct exception exc;
+	z = __ieee754_logf(x);
+	if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z;
+#ifndef HUGE_VAL 
+#define HUGE_VAL inf
+	double inf = 0.0;
+
+	SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
+#endif
+	exc.name = "logf";
+	exc.err = 0;
+	exc.arg1 = exc.arg2 = (double)x;
+	if (_LIB_VERSION == _SVID_)
+           exc.retval = -HUGE;
+	else
+	   exc.retval = -HUGE_VAL;
+	if(x==(float)0.0) {
+	    /* logf(0) */
+	    exc.type = SING;
+	    if (_LIB_VERSION == _POSIX_)
+	       errno = ERANGE;
+	    else if (!matherr(&exc)) {
+	       errno = EDOM;
+	    }
+	} else { 
+	    /* logf(x<0) */
+	    exc.type = DOMAIN;
+	    if (_LIB_VERSION == _POSIX_)
+	       errno = EDOM;
+	    else if (!matherr(&exc)) {
+	       errno = EDOM;
+	    }
+        }
+	if (exc.err != 0)
+           errno = exc.err;
+        return (float)exc.retval; 
+#endif
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double log(double x)
+#else
+	double log(x)
+	double x;
+#endif
+{
+	return (double) logf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */