floorf() is much like truncf().
2007-10-04 Bruno Haible <[EMAIL PROTECTED]>
* 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.
*** doc/functions/floorf.texi.orig 2007-10-05 02:59:52.000000000 +0200
--- doc/functions/floorf.texi 2007-10-05 02:42:40.000000000 +0200
***************
*** 4,18 ****
POSIX specification: @url{http://www.opengroup.org/susv3xsh/floorf.html}
! Gnulib module: ---
Portability problems fixed by Gnulib:
@itemize
@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
--- 4,18 ----
POSIX specification: @url{http://www.opengroup.org/susv3xsh/floorf.html}
! 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
@end itemize
Changing permissions from . to 100644
*** lib/floor.c.orig 2003-09-23 19:59:22.000000000 +0200
--- lib/floor.c 2007-10-05 02:56:36.000000000 +0200
***************
*** 0 ****
--- 1,83 ----
+ /* 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 <[EMAIL PROTECTED]>, 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;
+ }
Changing permissions from . to 100644
*** lib/floorf.c.orig 2003-09-23 19:59:22.000000000 +0200
--- lib/floorf.c 2007-10-05 02:37:48.000000000 +0200
***************
*** 0 ****
--- 1,21 ----
+ /* 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 <[EMAIL PROTECTED]>, 2007. */
+
+ #define USE_FLOAT
+ #include "floor.c"
*** lib/math.in.h.orig 2007-10-05 02:59:52.000000000 +0200
--- lib/math.in.h 2007-10-05 02:41:04.000000000 +0200
***************
*** 126,131 ****
--- 126,144 ----
#endif
+ #if @GNULIB_FLOORF@
+ # if [EMAIL PROTECTED]@
+ # 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@ || [EMAIL PROTECTED]@
extern long double floorl (long double x);
#endif
Changing permissions from . to 100644
*** m4/floorf.m4.orig 2003-09-23 19:59:22.000000000 +0200
--- m4/floorf.m4 2007-10-05 02:56:49.000000000 +0200
***************
*** 0 ****
--- 1,48 ----
+ # 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])
+ ])
*** m4/math_h.m4.orig 2007-10-05 02:59:52.000000000 +0200
--- m4/math_h.m4 2007-10-05 02:41:52.000000000 +0200
***************
*** 19,24 ****
--- 19,25 ----
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])
***************
*** 34,39 ****
--- 35,41 ----
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])
Changing permissions from . to 100644
*** modules/floorf.orig 2003-09-23 19:59:22.000000000 +0200
--- modules/floorf 2007-10-05 02:33:18.000000000 +0200
***************
*** 0 ****
--- 1,31 ----
+ 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:
+ $(FLOORF_LIBM)
+
+ License:
+ LGPL
+
+ Maintainer:
+ Bruno Haible
+
*** modules/math.orig 2007-10-05 02:59:52.000000000 +0200
--- modules/math 2007-10-05 02:42:25.000000000 +0200
***************
*** 22,27 ****
--- 22,28 ----
{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
sed -e 's/@''INCLUDE_NEXT''@/$(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''@|$(GNULIB_LDEXPL)|g' \
***************
*** 36,41 ****
--- 37,43 ----
-e 's|@''HAVE_DECL_CEILL''@|$(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' \
