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, 98 insertions, 0 deletions

diff --git a/rts/gmp/insert-dbl.c b/rts/gmp/insert-dbl.c
new file mode 100644
index 0000000000..dc88a56f62
--- /dev/null
+++ b/rts/gmp/insert-dbl.c
@@ -0,0 +1,98 @@
+/* __gmp_insert_double -- convert from array of mp_limb_t to double.
+
+Copyright (C) 1996, 1997, 1999, 2000 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"
+
+#ifdef XDEBUG
+#undef _GMP_IEEE_FLOATS
+#endif
+
+#ifndef _GMP_IEEE_FLOATS
+#define _GMP_IEEE_FLOATS 0
+#endif
+
+double
+#if __STDC__
+__gmp_scale2 (double d, int exp)
+#else
+__gmp_scale2 (d, exp)
+     double d;
+     int exp;
+#endif
+{
+#if _GMP_IEEE_FLOATS
+  {
+#if defined (__alpha) && __GNUC__ == 2 && __GNUC_MINOR__ == 8
+    /* Work around alpha-specific bug in GCC 2.8.x.  */
+    volatile
+#endif
+    union ieee_double_extract x;
+    x.d = d;
+    exp += x.s.exp;
+    x.s.exp = exp;
+    if (exp >= 2047)
+      {
+	/* Return +-infinity */
+	x.s.exp = 2047;
+	x.s.manl = x.s.manh = 0;
+      }
+    else if (exp < 1)
+      {
+	x.s.exp = 1;		/* smallest exponent (biased) */
+	/* Divide result by 2 until we have scaled it to the right IEEE
+	   denormalized number, but stop if it becomes zero.  */
+	while (exp < 1 && x.d != 0)
+	  {
+	    x.d *= 0.5;
+	    exp++;
+	  }
+      }
+    return x.d;
+  }
+#else
+  {
+    double factor, r;
+
+    factor = 2.0;
+    if (exp < 0)
+      {
+	factor = 0.5;
+	exp = -exp;
+      }
+    r = d;
+    if (exp != 0)
+      {
+	if ((exp & 1) != 0)
+	  r *= factor;
+	exp >>= 1;
+	while (exp != 0)
+	  {
+	    factor *= factor;
+	    if ((exp & 1) != 0)
+	      r *= factor;
+	    exp >>= 1;
+	  }
+      }
+    return r;
+  }
+#endif
+}