+2011-10-10 Bruno Haible <bruno@clisp.org>
+
+ logl: Simplify for platforms where 'long double' == 'double'.
+ * lib/logl.c (logl) [HAVE_SAME_LONG_DOUBLE_AS_DOUBLE]: New alternative
+ implementation.
+ * m4/logl.m4 (gl_FUNC_LOGL): Require gl_LONG_DOUBLE_VS_DOUBLE.
+ Determine LOGL_LIBM according to HAVE_SAME_LONG_DOUBLE_AS_DOUBLE.
+ * modules/logl (Depends-on): Add log. Update conditions.
+
2011-10-10 Bruno Haible <bruno@clisp.org>
expl: Simplify for platforms where 'long double' == 'double'.
/* Specification. */
#include <math.h>
+#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
+
+long double
+logl (long double x)
+{
+ return log (x);
+}
+
+#else
+
/* 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,
y += e * ln2a;
return y;
}
+
+#endif
-# logl.m4 serial 5
+# logl.m4 serial 6
dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_LOGL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare logl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
HAVE_DECL_LOGL=0
HAVE_LOGL=0
dnl Find libraries needed to link lib/logl.c.
- AC_REQUIRE([gl_FUNC_FREXPL])
- AC_REQUIRE([gl_FUNC_ISNANL])
- AC_REQUIRE([gl_FUNC_FLOORL])
- dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
- case " $LOGL_LIBM " in
- *" $FREXPL_LIBM "*) ;;
- *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
- esac
- dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
- case " $LOGL_LIBM " in
- *" $ISNANL_LIBM "*) ;;
- *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
- esac
- dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
- case " $LOGL_LIBM " in
- *" $FLOORL_LIBM "*) ;;
- *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
- esac
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_LOG])
+ LOGL_LIBM="$LOG_LIBM"
+ else
+ AC_REQUIRE([gl_FUNC_FREXPL])
+ AC_REQUIRE([gl_FUNC_ISNANL])
+ AC_REQUIRE([gl_FUNC_FLOORL])
+ dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+ case " $LOGL_LIBM " in
+ *" $FREXPL_LIBM "*) ;;
+ *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
+ esac
+ dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+ case " $LOGL_LIBM " in
+ *" $ISNANL_LIBM "*) ;;
+ *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
+ esac
+ dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+ case " $LOGL_LIBM " in
+ *" $FLOORL_LIBM "*) ;;
+ *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
+ esac
+ fi
fi
AC_SUBST([LOGL_LIBM])
])
Depends-on:
math
extensions
-frexpl [test $HAVE_LOGL = 0]
-isnanl [test $HAVE_LOGL = 0]
-floorl [test $HAVE_LOGL = 0]
+log [test $HAVE_LOGL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1]
+frexpl [test $HAVE_LOGL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
+isnanl [test $HAVE_LOGL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
+floorl [test $HAVE_LOGL = 0 && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
configure.ac:
gl_FUNC_LOGL