Import Gnulib's `log1p' and `round' modules.

From Gnulib v0.0-4889-ge375fe3.

* m4/gnulib-cache.m4: Add `log1p' and `round', requested by
  Mark H Weaver <mhw@netris.org>.
  Use `malloc-gnu' instead of `malloc', the latter being obsolete.

3 files changed, 287 insertions, 1 deletions

diff --git a/lib/Makefile.am b/lib/Makefile.am
index 6d59b8bc6..2e5b7db86 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -9,7 +9,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl=3 --libtool --macro-prefix=gl --no-vc-files accept alignof alloca-opt announce-gen autobuild bind byteswap canonicalize-lgpl close connect duplocale environ extensions flock fpieee full-read full-write func gendocs getaddrinfo getpeername getsockname getsockopt git-version-gen gitlog-to-changelog gnu-web-doc-update gnupload havelib iconv_open-utf inet_ntop inet_pton isinf isnan lib-symbol-versions lib-symbol-visibility libunistring listen locale maintainer-makefile malloc malloca nproc putenv recv recvfrom send sendto setsockopt shutdown socket sockets stat-time stdlib strcase strftime striconveh string sys_stat trunc verify version-etc-fsf vsnprintf warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl=3 --libtool --macro-prefix=gl --no-vc-files accept alignof alloca-opt announce-gen autobuild bind byteswap canonicalize-lgpl close connect duplocale environ extensions flock fpieee full-read full-write func gendocs getaddrinfo getpeername getsockname getsockopt git-version-gen gitlog-to-changelog gnu-web-doc-update gnupload havelib iconv_open-utf inet_ntop inet_pton isinf isnan lib-symbol-versions lib-symbol-visibility libunistring listen locale log1p maintainer-makefile malloc malloca nproc putenv recv recvfrom round send sendto setsockopt shutdown socket sockets stat-time stdlib strcase strftime striconveh string sys_stat trunc verify version-etc-fsf vsnprintf warnings
 
 AUTOMAKE_OPTIONS = 1.5 gnits subdir-objects
 
@@ -37,6 +37,7 @@ libgnu_la_DEPENDENCIES = $(gl_LTLIBOBJS)
 EXTRA_libgnu_la_SOURCES =
 libgnu_la_LDFLAGS = $(AM_LDFLAGS)
 libgnu_la_LDFLAGS += -no-undefined
+libgnu_la_LDFLAGS += $(FLOOR_LIBM)
 libgnu_la_LDFLAGS += $(GETADDRINFO_LIB)
 libgnu_la_LDFLAGS += $(HOSTENT_LIB)
 libgnu_la_LDFLAGS += $(INET_NTOP_LIB)
@@ -45,9 +46,11 @@ libgnu_la_LDFLAGS += $(ISNAND_LIBM)
 libgnu_la_LDFLAGS += $(ISNANF_LIBM)
 libgnu_la_LDFLAGS += $(ISNANL_LIBM)
 libgnu_la_LDFLAGS += $(LIBSOCKET)
+libgnu_la_LDFLAGS += $(LOG1P_LIBM)
 libgnu_la_LDFLAGS += $(LTLIBICONV)
 libgnu_la_LDFLAGS += $(LTLIBINTL)
 libgnu_la_LDFLAGS += $(LTLIBUNISTRING)
+libgnu_la_LDFLAGS += $(ROUND_LIBM)
 libgnu_la_LDFLAGS += $(SERVENT_LIB)
 libgnu_la_LDFLAGS += $(TRUNC_LIBM)
 
@@ -331,6 +334,15 @@ EXTRA_libgnu_la_SOURCES += flock.c
 
 ## end   gnulib module flock
 
+## begin gnulib module floor
+
+
+EXTRA_DIST += floor.c
+
+EXTRA_libgnu_la_SOURCES += floor.c
+
+## end   gnulib module floor
+
 ## begin gnulib module full-read
 
 libgnu_la_SOURCES += full-read.h full-read.c
@@ -892,6 +904,15 @@ EXTRA_libgnu_la_SOURCES += recvfrom.c
 
 ## end   gnulib module recvfrom
 
+## begin gnulib module round
+
+
+EXTRA_DIST += round.c
+
+EXTRA_libgnu_la_SOURCES += round.c
+
+## end   gnulib module round
+
 ## begin gnulib module safe-read
 
 
diff --git a/lib/floor.c b/lib/floor.c
new file mode 100644
index 000000000..12d0194bd
--- /dev/null
+++ b/lib/floor.c
@@ -0,0 +1,97 @@
+/* Round towards negative infinity.
+   Copyright (C) 2007, 2010-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published by
+   the Free Software Foundation; either version 3 of the License, 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* 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;
+
+  if (z > L_(0.0))
+    {
+      /* For 0 < x < 1, return +0.0 even if the current rounding mode is
+         FE_DOWNWARD.  */
+      if (z < L_(1.0))
+        z = L_(0.0);
+      /* Avoid rounding errors for values near 2^k, where k >= MANT_DIG-1.  */
+      else if (z < TWO_MANT_DIG)
+        {
+          /* Round to the next integer (nearest or up or down, doesn't matter).  */
+          z += TWO_MANT_DIG;
+          z -= TWO_MANT_DIG;
+          /* Enforce rounding down.  */
+          if (z > y)
+            z -= L_(1.0);
+        }
+    }
+  else if (z < L_(0.0))
+    {
+      /* Avoid rounding errors for values near -2^k, where k >= MANT_DIG-1.  */
+      if (z > - TWO_MANT_DIG)
+        {
+          /* Round to the next integer (nearest or up or down, doesn't matter).  */
+          z -= TWO_MANT_DIG;
+          z += TWO_MANT_DIG;
+          /* Enforce rounding down.  */
+          if (z > y)
+            z -= L_(1.0);
+        }
+    }
+  return z;
+}
diff --git a/lib/round.c b/lib/round.c
new file mode 100644
index 000000000..1630a6d79
--- /dev/null
+++ b/lib/round.c
@@ -0,0 +1,168 @@
+/* Round toward nearest, breaking ties away from zero.
+   Copyright (C) 2007, 2010-2011 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser 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 Ben Pfaff <blp@gnu.org>, 2007.
+   Based heavily on code by Bruno Haible. */
+
+#include <config.h>
+
+/* Specification.  */
+#include <math.h>
+
+#include <float.h>
+
+#undef MIN
+
+#ifdef USE_LONG_DOUBLE
+# define ROUND roundl
+# define FLOOR floorl
+# define CEIL ceill
+# define DOUBLE long double
+# define MANT_DIG LDBL_MANT_DIG
+# define MIN LDBL_MIN
+# define L_(literal) literal##L
+# define HAVE_FLOOR_AND_CEIL HAVE_FLOORL_AND_CEILL
+#elif ! defined USE_FLOAT
+# define ROUND round
+# define FLOOR floor
+# define CEIL ceil
+# define DOUBLE double
+# define MANT_DIG DBL_MANT_DIG
+# define MIN DBL_MIN
+# define L_(literal) literal
+# define HAVE_FLOOR_AND_CEIL 1
+#else /* defined USE_FLOAT */
+# define ROUND roundf
+# define FLOOR floorf
+# define CEIL ceilf
+# define DOUBLE float
+# define MANT_DIG FLT_MANT_DIG
+# define MIN FLT_MIN
+# define L_(literal) literal##f
+# define HAVE_FLOOR_AND_CEIL HAVE_FLOORF_AND_CEILF
+#endif
+
+/* -0.0.  See minus-zero.h.  */
+#if defined __hpux || defined __sgi || defined __ICC
+# define MINUS_ZERO (-MIN * MIN)
+#else
+# define MINUS_ZERO L_(-0.0)
+#endif
+
+/* If we're being included from test-round2[f].c, it already defined names for
+   our round implementations.  Otherwise, pick the preferred implementation for
+   this machine. */
+#if !defined FLOOR_BASED_ROUND && !defined FLOOR_FREE_ROUND
+# if HAVE_FLOOR_AND_CEIL
+#  define FLOOR_BASED_ROUND ROUND
+# else
+#  define FLOOR_FREE_ROUND ROUND
+# endif
+#endif
+
+#ifdef FLOOR_BASED_ROUND
+/* An implementation of the C99 round function based on floor and ceil.  We use
+   this when floor and ceil are available, on the assumption that they are
+   faster than the open-coded versions below. */
+DOUBLE
+FLOOR_BASED_ROUND (DOUBLE x)
+{
+  if (x >= L_(0.0))
+    {
+      DOUBLE y = FLOOR (x);
+      if (x - y >= L_(0.5))
+        y += L_(1.0);
+      return y;
+    }
+  else
+    {
+      DOUBLE y = CEIL (x);
+      if (y - x >= L_(0.5))
+        y -= L_(1.0);
+      return y;
+    }
+}
+#endif /* FLOOR_BASED_ROUND */
+
+#ifdef FLOOR_FREE_ROUND
+/* An implementation of the C99 round function without floor or ceil.
+   We use this when floor or ceil is missing. */
+DOUBLE
+FLOOR_FREE_ROUND (DOUBLE x)
+{
+  /* 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));
+
+  /* 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;
+
+  if (z > L_(0.0))
+    {
+      /* Avoid rounding error for x = 0.5 - 2^(-MANT_DIG-1).  */
+      if (z < L_(0.5))
+        z = L_(0.0);
+      /* Avoid rounding errors for values near 2^k, where k >= MANT_DIG-1.  */
+      else if (z < TWO_MANT_DIG)
+        {
+          /* Add 0.5 to the absolute value.  */
+          y = z += L_(0.5);
+          /* Round to the next integer (nearest or up or down, doesn't
+             matter).  */
+          z += TWO_MANT_DIG;
+          z -= TWO_MANT_DIG;
+          /* Enforce rounding down.  */
+          if (z > y)
+            z -= L_(1.0);
+        }
+    }
+  else if (z < L_(0.0))
+    {
+      /* Avoid rounding error for x = -(0.5 - 2^(-MANT_DIG-1)).  */
+      if (z > - L_(0.5))
+        z = MINUS_ZERO;
+      /* Avoid rounding errors for values near -2^k, where k >= MANT_DIG-1.  */
+      else if (z > -TWO_MANT_DIG)
+        {
+          /* Add 0.5 to the absolute value.  */
+          y = z -= L_(0.5);
+          /* Round to the next integer (nearest or up or down, doesn't
+             matter).  */
+          z -= TWO_MANT_DIG;
+          z += TWO_MANT_DIG;
+          /* Enforce rounding up.  */
+          if (z < y)
+            z += L_(1.0);
+        }
+    }
+  return z;
+}
+#endif /* FLOOR_FREE_ROUND */
+