+2007-10-04 Bruno Haible <bruno@clisp.org>
+
+ * modules/floorf: New file.
+ * lib/floor.c: New file.
+ * lib/floorf.c: New file.
+ * m4/floorf.m4: New file.
+ * lib/math.in.h (floorf): New declaration.
+ * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize GNULIB_FLOORF and
+ HAVE_DECL_FLOORF.
+ * modules/math (Makefile.am): Substitute also GNULIB_FLOORF and
+ HAVE_DECL_FLOORF.
+ * doc/functions/floorf.texi: Mention the 'floorf' module.
+
2007-10-04 Benoit Sigoure <tsuna@lrde.epita.fr>
Bruno Haible <bruno@clisp.org>
POSIX specification: @url{http://www.opengroup.org/susv3xsh/floorf.html}
-Gnulib module: ---
+Gnulib module: floorf
Portability problems fixed by Gnulib:
@itemize
+@item
+This function is missing on some platforms:
+AIX 5.1, HP-UX 11, Solaris 9.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
-@item
-This function is missing on some platforms:
-AIX 5.1, HP-UX 11, Solaris 9.
@end itemize
--- /dev/null
+/* Round towards negative infinity.
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <config.h>
+
+/* Specification. */
+#include <math.h>
+
+#include <float.h>
+
+#ifdef USE_LONG_DOUBLE
+# define FUNC floorl
+# define DOUBLE long double
+# define MANT_DIG LDBL_MANT_DIG
+# define L_(literal) literal##L
+#elif ! defined USE_FLOAT
+# define FUNC floor
+# define DOUBLE double
+# define MANT_DIG DBL_MANT_DIG
+# define L_(literal) literal
+#else /* defined USE_FLOAT */
+# define FUNC floorf
+# define DOUBLE float
+# define MANT_DIG FLT_MANT_DIG
+# define L_(literal) literal##f
+#endif
+
+/* 2^(MANT_DIG-1). */
+static const double TWO_MANT_DIG =
+ /* Assume MANT_DIG <= 5 * 31.
+ Use the identity
+ n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5). */
+ (DOUBLE) (1U << ((MANT_DIG - 1) / 5))
+ * (DOUBLE) (1U << ((MANT_DIG - 1 + 1) / 5))
+ * (DOUBLE) (1U << ((MANT_DIG - 1 + 2) / 5))
+ * (DOUBLE) (1U << ((MANT_DIG - 1 + 3) / 5))
+ * (DOUBLE) (1U << ((MANT_DIG - 1 + 4) / 5));
+
+DOUBLE
+FUNC (DOUBLE x)
+{
+ /* The use of 'volatile' guarantees that excess precision bits are dropped
+ at each addition step and before the following comparison at the caller's
+ site. It is necessary on x86 systems where double-floats are not IEEE
+ compliant by default, to avoid that the results become platform and compiler
+ option dependent. 'volatile' is a portable alternative to gcc's
+ -ffloat-store option. */
+ volatile DOUBLE y = x;
+ volatile DOUBLE z = y;
+
+ /* Round to the next integer (nearest or up or down, doesn't matter). */
+ if (z > L_(0.0))
+ {
+ z += TWO_MANT_DIG;
+ z -= TWO_MANT_DIG;
+ }
+ else if (z < L_(0.0))
+ {
+ z -= TWO_MANT_DIG;
+ z += TWO_MANT_DIG;
+ }
+ /* Enforce rounding down. */
+ if (z > y)
+ z -= L_(1.0);
+
+ return z;
+}
--- /dev/null
+/* Round towards negative infinity.
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#define USE_FLOAT
+#include "floor.c"
#endif
+#if @GNULIB_FLOORF@
+# if !@HAVE_DECL_FLOORF@
+# define floorf rpl_floorf
+extern float floorf (float x);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef floorf
+# define floorf(x) \
+ (GL_LINK_WARNING ("floorf is unportable - " \
+ "use gnulib module floorf for portability"), \
+ floorf (x))
+#endif
+
#if @GNULIB_MATHL@ || !@HAVE_DECL_FLOORL@
extern long double floorl (long double x);
#endif
--- /dev/null
+# floorf.m4 serial 1
+dnl Copyright (C) 2007 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_FLOORF],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ dnl Persuade glibc <math.h> to declare floorf().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ dnl Test whether floorf() is declared.
+ AC_CHECK_DECLS([floorf], , , [#include <math.h>])
+ if test "$ac_cv_have_decl_floorf" = yes; then
+ dnl Test whether floorf() can be used without libm.
+ FLOORF_LIBM=?
+ AC_TRY_LINK([
+ #ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ float x;],
+ [x = floorf(x);],
+ [FLOORF_LIBM=])
+ if test "$FLOORF_LIBM" = "?"; then
+ save_LIBS="$LIBS"
+ LIBS="$LIBS -lm"
+ AC_TRY_LINK([
+ #ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ float x;],
+ [x = floorf(x);],
+ [FLOORF_LIBM="-lm"])
+ LIBS="$save_LIBS"
+ fi
+ if test "$FLOORF_LIBM" = "?"; then
+ FLOORF_LIBM=
+ fi
+ else
+ HAVE_DECL_FLOORF=0
+ AC_LIBOBJ([floorf])
+ FLOORF_LIBM=
+ fi
+ AC_SUBST([HAVE_DECL_FLOORF])
+ AC_SUBST([FLOORF_LIBM])
+])
AC_DEFUN([gl_MATH_H_DEFAULTS],
[
+ GNULIB_FLOORF=0; AC_SUBST([GNULIB_FLOORF])
GNULIB_FREXP=0; AC_SUBST([GNULIB_FREXP])
GNULIB_FREXPL=0; AC_SUBST([GNULIB_FREXPL])
GNULIB_LDEXPL=0; AC_SUBST([GNULIB_LDEXPL])
HAVE_DECL_CEILL=1; AC_SUBST([HAVE_DECL_CEILL])
HAVE_DECL_COSL=1; AC_SUBST([HAVE_DECL_COSL])
HAVE_DECL_EXPL=1; AC_SUBST([HAVE_DECL_EXPL])
+ HAVE_DECL_FLOORF=1; AC_SUBST([HAVE_DECL_FLOORF])
HAVE_DECL_FLOORL=1; AC_SUBST([HAVE_DECL_FLOORL])
HAVE_DECL_FREXPL=1; AC_SUBST([HAVE_DECL_FREXPL])
HAVE_DECL_LDEXPL=1; AC_SUBST([HAVE_DECL_LDEXPL])
--- /dev/null
+Description:
+floorf() function: round towards negative infinity.
+
+Files:
+lib/floorf.c
+lib/floor.c
+m4/floorf.m4
+
+Depends-on:
+math
+extensions
+float
+
+configure.ac:
+gl_FUNC_FLOORF
+gl_MATH_MODULE_INDICATOR([floorf])
+
+Makefile.am:
+
+Include:
+<math.h>
+
+Link:
+$(FLOORF_LIBM)
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+
{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
sed -e 's/@''INCLUDE_NEXT''@/$(INCLUDE_NEXT)/g' \
-e 's|@''NEXT_MATH_H''@|$(NEXT_MATH_H)|g' \
+ -e 's|@''GNULIB_FLOORF''@|$(GNULIB_FLOORF)|g' \
-e 's|@''GNULIB_FREXP''@|$(GNULIB_FREXP)|g' \
-e 's|@''GNULIB_FREXPL''@|$(GNULIB_FREXPL)|g' \
-e 's|@''GNULIB_LDEXPL''@|$(GNULIB_LDEXPL)|g' \
-e 's|@''HAVE_DECL_CEILL''@|$(HAVE_DECL_CEILL)|g' \
-e 's|@''HAVE_DECL_COSL''@|$(HAVE_DECL_COSL)|g' \
-e 's|@''HAVE_DECL_EXPL''@|$(HAVE_DECL_EXPL)|g' \
+ -e 's|@''HAVE_DECL_FLOORF''@|$(HAVE_DECL_FLOORF)|g' \
-e 's|@''HAVE_DECL_FLOORL''@|$(HAVE_DECL_FLOORL)|g' \
-e 's|@''HAVE_DECL_FREXPL''@|$(HAVE_DECL_FREXPL)|g' \
-e 's|@''HAVE_DECL_LDEXPL''@|$(HAVE_DECL_LDEXPL)|g' \
projects / pspp / commitdiff