/* Specification. */
#include <math.h>
-/* logll.c
+#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
+
+long double
+logl (long double x)
+{
+ return log (x);
+}
+
+#elif HAVE_LOGL
+
+long double
+logl (long double x)
+# undef logl
+{
+ /* Work around the OSF/1 5.1 bug. */
+ if (x == 0.0L)
+ /* Return -Infinity. */
+ return -1.0L / 0.0L;
+ return logl (x);
+}
+
+#else
+
+/* Code based on glibc/sysdeps/ieee754/ldbl-128/e_logl.c. */
+
+/* logll.c
*
* Natural logarithm for 128-bit long double precision.
*
-2.7902661731604211834685052867305795169688E-4L,
-1.2335696813916860754951146082826952093496E-4L,
-3.0677461025892873184042490943581654591817E-5L,
-#define ZERO logtbl[38]
+# define ZERO logtbl[38]
0.0000000000000000000000000000000000000000E0L,
-3.0359557945051052537099938863236321874198E-5L,
-1.2081346403474584914595395755316412213151E-4L,
ln2b = 1.4286068203094172321214581765680755001344E-6L;
long double
-logl(long double x)
+logl (long double x)
{
long double z, y, w;
long double t;
}
/* Extract exponent and reduce domain to 0.703125 <= u < 1.40625 */
- x = frexpl(x, &e);
+ x = frexpl (x, &e);
if (x < 0.703125L)
{
x += x;
/* Series expansion of log(1+z). */
w = z * z;
y = ((((((((((((l15 * z
- + l14) * z
- + l13) * z
- + l12) * z
- + l11) * z
- + l10) * z
- + l9) * z
- + l8) * z
- + l7) * z
- + l6) * z
- + l5) * z
- + l4) * z
+ + l14) * z
+ + l13) * z
+ + l12) * z
+ + l11) * z
+ + l10) * z
+ + l9) * z
+ + l8) * z
+ + l7) * z
+ + l6) * z
+ + l5) * z
+ + l4) * z
+ l3) * z * w;
y -= 0.5 * w;
y += e * ln2b; /* Base 2 exponent offset times ln(2). */
y += e * ln2a;
return y;
}
+
+#endif