config.host (arc*-*-elf*, [...]): New configurations.

[thirdparty/gcc.git] / libgcc / config / arc / divtab-arc700.c

diff --git a/libgcc/config/arc/divtab-arc700.c b/libgcc/config/arc/divtab-arc700.c
new file mode 100644 (file)
index 0000000..556df8c
--- /dev/null
+++ b/libgcc/config/arc/divtab-arc700.c
@@ -0,0 +1,70 @@
+/* Copyright (C) 2004, 2006, 2007-2012 Free Software Foundation, Inc.
+   Contributor: Joern Rennecke <joern.rennecke@embecosm.com>
+               on behalf of Synopsys Inc.
+
+This file is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+This file 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Calculate division table for ARC700 integer division
+   Contributed by Joern Rennecke
+   joern.rennecke@arc.com  */
+
+#include <stdio.h>
+#include <math.h>
+
+int
+main ()
+{
+  int i, j;
+  unsigned x;
+  double q, r, err, max_err = -1;
+
+  puts("/* This table has been generated by divtab-arc700.c.  */");
+  puts("\
+/* 1/512 .. 1/256, normalized.  There is a leading 1 in bit 31.\n\
+   For powers of two, we list unnormalized numbers instead.  The values\n\
+   for powers of 2 are loaded, but not used.  The value for 1 is actually\n\
+   the first instruction after .Lmuldiv.  */\n\
+       .balign 4");
+  puts (".Ldivtab:\n");
+  for (i = 256; i >= 2; --i)
+    {
+      j = i < 0 ? -i : i;
+      if (j & (j-1))
+       while (j < 128)
+         j += j;
+      else
+       /* Power of two. */
+       j *= 128;
+      q = 4.*(1<<30)*128/j;
+      r = ceil (q);
+      printf ("\t.long\t0x%X\n", (unsigned) r);
+      err = r - q;
+      if (err > max_err)
+       max_err = err;
+    }
+#if 0
+  printf ("\t/* maximum error: %f */\n", max_err);
+#endif
+  exit (0);
+}