Update Gnulib; add new modules; remove `round' module.

This updates Gnulib to v0.0-4951-g6ff7b70. * m4/gnulib-cache.m4: Add floor, ceil, frexp, and ldexp. Add wchar as an explicit dependency; it had been present as an indirect dependency before, but no longer. Remove round, which I had requested earlier, but turned out to be unnecessary.
2025-04-30 03:40:34 +02:00 · 2011-03-07 06:27:42 -05:00 · 2011-03-07 06:27:42 -05:00 · dd36ce77cd
commit dd36ce77cd
parent df12979562
31 changed files with 885 additions and 728 deletions
--- a/lib/ceil.c
+++ b/lib/ceil.c
@ -0,0 +1,109 @@
+/* Round towards positive 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>
+
+#undef MIN
+
+#ifdef USE_LONG_DOUBLE
+# define FUNC ceill
+# define DOUBLE long double
+# define MANT_DIG LDBL_MANT_DIG
+# define MIN LDBL_MIN
+# define L_(literal) literal##L
+#elif ! defined USE_FLOAT
+# define FUNC ceil
+# define DOUBLE double
+# define MANT_DIG DBL_MANT_DIG
+# define MIN DBL_MIN
+# define L_(literal) literal
+#else /* defined USE_FLOAT */
+# define FUNC ceilf
+# define DOUBLE float
+# define MANT_DIG FLT_MANT_DIG
+# define MIN FLT_MIN
+# define L_(literal) literal##f
+#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
+
+/* 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))
+    {
+      /* 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 up.  */
+          if (z < y)
+            z += L_(1.0);
+        }
+    }
+  else if (z < L_(0.0))
+    {
+      /* For -1 < x < 0, return -0.0 regardless of the current rounding
+         mode.  */
+      if (z > L_(-1.0))
+        z = MINUS_ZERO;
+      /* 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 up.  */
+          if (z < y)
+            z += L_(1.0);
+        }
+    }
+  return z;
+}