Reorganisation of the source tree

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.

1 files changed, 104 insertions, 0 deletions

diff --git a/rts/gmp/mpz/fdiv_q_2exp.c b/rts/gmp/mpz/fdiv_q_2exp.c
new file mode 100644
index 0000000000..8e02180ecc
--- /dev/null
+++ b/rts/gmp/mpz/fdiv_q_2exp.c
@@ -0,0 +1,104 @@
+/* mpz_fdiv_q_2exp -- Divide an integer by 2**CNT.  Round the quotient
+   towards -infinity.
+
+Copyright (C) 1991, 1993, 1994, 1996, 1998, 1999 Free Software Foundation,
+Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpz_fdiv_q_2exp (mpz_ptr w, mpz_srcptr u, unsigned long int cnt)
+#else
+mpz_fdiv_q_2exp (w, u, cnt)
+     mpz_ptr w;
+     mpz_srcptr u;
+     unsigned long int cnt;
+#endif
+{
+  mp_size_t usize = u->_mp_size;
+  mp_size_t wsize;
+  mp_size_t abs_usize = ABS (usize);
+  mp_size_t limb_cnt;
+  mp_ptr wp;
+  mp_limb_t round = 0;
+
+  limb_cnt = cnt / BITS_PER_MP_LIMB;
+  wsize = abs_usize - limb_cnt;
+  if (wsize <= 0)
+    {
+      wp = w->_mp_d;
+      wsize = 0;
+      /* Set ROUND since we know we skip some non-zero words in this case.
+	 Well, if U is zero, we don't, but then this will be taken care of
+	 below, since rounding only really takes place for negative U.  */
+      round = 1;
+      wp[0] = 1;
+      w->_mp_size = -(usize < 0);
+      return;
+    }
+  else
+    {
+      mp_size_t i;
+      mp_ptr up;
+
+      /* Make sure there is enough space.  We make an extra limb
+	 here to account for possible rounding at the end.  */
+      if (w->_mp_alloc < wsize + 1)
+	_mpz_realloc (w, wsize + 1);
+
+      wp = w->_mp_d;
+      up = u->_mp_d;
+
+      /* Set ROUND if we are about skip some non-zero limbs.  */
+      for (i = 0; i < limb_cnt && round == 0; i++)
+	round = up[i];
+
+      cnt %= BITS_PER_MP_LIMB;
+      if (cnt != 0)
+	{
+	  round |= mpn_rshift (wp, up + limb_cnt, wsize, cnt);
+	  wsize -= wp[wsize - 1] == 0;
+	}
+      else
+	{
+	  MPN_COPY_INCR (wp, up + limb_cnt, wsize);
+	}
+    }
+
+  if (usize < 0 && round != 0)
+    {
+      mp_limb_t cy;
+      if (wsize != 0)
+	{
+	  cy = mpn_add_1 (wp, wp, wsize, (mp_limb_t) 1);
+	  wp[wsize] = cy;
+	  wsize += cy;
+	}
+      else
+	{
+	  /* We shifted something negative to zero.  The result is -1.  */
+	  wp[0] = 1;
+	  wsize = 1;
+	}
+    }
+  w->_mp_size = usize >= 0 ? wsize : -wsize;
+}