Source reorganization. In short:

  * Added directories and moved related files into them:
      - src for the MPFR source files (to build the library).
      - doc for documentation files (except INSTALL, README...).
      - tools for various tools (scripts) and mbench.
      - tune for tuneup-related source files.
      - other for other source files (not distributed in tarballs).
    Existing directories:
      - tests for the source files of the test suite (make check).
      - examples for examples.
      - m4 for m4 files.
  * Renamed configure.in to configure.ac.
  * Added/updated Makefile.am files where needed.
  * Updated acinclude.m4 and configure.ac (AC_CONFIG_FILES line).
  * Updated the documentation (INSTALL, README, doc/README.dev and
    doc/mpfr.texi).
  * Updated NEWS and TODO.
  * Updated the scripts now in tools.

The following script was used:

#!/usr/bin/env zsh
svn mkdir doc other src tools tune
svn mv ${${(M)$(sed -n '/libmpfr_la_SOURCES/,/[^\]$/p' \
         Makefile.am):#*.[ch]}:#get_patches.c} mparam_h.in \
       round_raw_generic.c jyn_asympt.c src
svn mv mbench check_inits_clears coverage get_patches.sh mpfrlint \
  nightly-test update-patchv update-version tools
svn mv bidimensional_sample.c speed.c tuneup.c tune
svn mv *.{c,h} other
svn mv FAQ.html README.dev algorithm* faq.xsl fdl.texi mpfr.texi \
  update-faq doc
svn mv configure.in configure.ac
svn cp Makefile.am src/Makefile.am
svn rm replace_all
[Modifying some files, see above]
svn add doc/Makefile.am
svn add tune/Makefile.am

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@7087 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 145 insertions, 0 deletions

diff --git a/src/cache.c b/src/cache.c
new file mode 100644
index 000000000..10a276bbe
--- /dev/null
+++ b/src/cache.c
@@ -0,0 +1,145 @@
+/* mpfr_cache -- cache interface for multiple-precision constants in MPFR.
+
+Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+Contributed by the Arenaire and Caramel projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library 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.
+
+The GNU MPFR Library 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 the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+#if 0 /* this function is not used/documented/tested so far, it could be
+         useful if some user wants to add a new constant to mpfr, and
+         implement a cache mechanism for that constant */
+void
+mpfr_init_cache (mpfr_cache_t cache, int (*func)(mpfr_ptr, mpfr_rnd_t))
+{
+  MPFR_PREC (cache->x) = 0; /* Invalid prec to detect that the cache is not
+                               valid. Maybe add a flag? */
+  cache->func = func;
+}
+#endif
+
+void
+mpfr_clear_cache (mpfr_cache_t cache)
+{
+  if (MPFR_PREC (cache->x) != 0)
+    mpfr_clear (cache->x);
+  MPFR_PREC (cache->x) = 0;
+}
+
+int
+mpfr_cache (mpfr_ptr dest, mpfr_cache_t cache, mpfr_rnd_t rnd)
+{
+  mpfr_prec_t prec = MPFR_PREC (dest);
+  mpfr_prec_t pold = MPFR_PREC (cache->x);
+  int inexact, sign;
+  MPFR_SAVE_EXPO_DECL (expo);
+
+  MPFR_SAVE_EXPO_MARK (expo);
+
+  if (MPFR_UNLIKELY (prec > pold))
+    {
+      /* No previous result in the cache or the precision of the
+         previous result is not sufficient. */
+
+      if (MPFR_UNLIKELY (pold == 0))  /* No previous result. */
+        mpfr_init2 (cache->x, prec);
+
+      /* Update the cache. */
+      pold = prec;
+      /* no need to keep the previous value */
+      mpfr_set_prec (cache->x, pold);
+      cache->inexact = (*cache->func) (cache->x, MPFR_RNDN);
+    }
+
+  /* now pold >= prec is the precision of cache->x */
+
+  /* First, check if the cache has the exact value (unlikely).
+     Else the exact value is between (assuming x=cache->x > 0):
+       x and x+ulp(x) if cache->inexact < 0,
+       x-ulp(x) and x if cache->inexact > 0,
+     and abs(x-exact) <= ulp(x)/2. */
+
+  /* we assume all cached constants are positive */
+  MPFR_ASSERTN (MPFR_IS_POS (cache->x)); /* TODO... */
+  sign = MPFR_SIGN (cache->x);
+  MPFR_SET_EXP (dest, MPFR_GET_EXP (cache->x));
+  MPFR_SET_SIGN (dest, sign);
+
+  /* round cache->x from precision pold down to precision prec */
+  MPFR_RNDRAW_GEN (inexact, dest,
+                   MPFR_MANT (cache->x), pold, rnd, sign,
+                   if (MPFR_UNLIKELY (cache->inexact == 0))
+                     {
+                       if ((_sp[0] & _ulp) == 0)
+                         {
+                           inexact = -sign;
+                           goto trunc_doit;
+                         }
+                       else
+                         goto addoneulp;
+                     }
+                   else if (cache->inexact < 0)
+                     goto addoneulp;
+                   else /* cache->inexact > 0 */
+                     {
+                       inexact = -sign;
+                       goto trunc_doit;
+                     },
+                   if (MPFR_UNLIKELY (++MPFR_EXP (dest) > __gmpfr_emax))
+                     mpfr_overflow (dest, rnd, sign);
+                  );
+
+  if (MPFR_LIKELY (cache->inexact != 0))
+    {
+      switch (rnd)
+        {
+        case MPFR_RNDZ:
+        case MPFR_RNDD:
+          if (MPFR_UNLIKELY (inexact == 0))
+            {
+              inexact = cache->inexact;
+              if (inexact > 0)
+                {
+                  mpfr_nextbelow (dest);
+                  inexact = -inexact;
+                }
+            }
+          break;
+        case MPFR_RNDU:
+        case MPFR_RNDA:
+          if (MPFR_UNLIKELY (inexact == 0))
+            {
+              inexact = cache->inexact;
+              if (inexact < 0)
+                {
+                  mpfr_nextabove (dest);
+                  inexact = -inexact;
+                }
+            }
+          break;
+        default: /* MPFR_RNDN */
+          if (MPFR_UNLIKELY(inexact == 0))
+            inexact = cache->inexact;
+          break;
+        }
+    }
+
+  MPFR_SAVE_EXPO_FREE (expo);
+  return mpfr_check_range (dest, inexact, rnd);
+}