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      1  1.7  mrg /* Copyright (C) 2004-2022 Free Software Foundation, Inc.
      2  1.1  mrg    Contributor: Joern Rennecke <joern.rennecke (at) embecosm.com>
      3  1.1  mrg 		on behalf of Synopsys Inc.
      4  1.1  mrg 
      5  1.1  mrg This file is free software; you can redistribute it and/or modify it
      6  1.1  mrg under the terms of the GNU General Public License as published by the
      7  1.1  mrg Free Software Foundation; either version 3, or (at your option) any
      8  1.1  mrg later version.
      9  1.1  mrg 
     10  1.1  mrg In addition to the permissions in the GNU General Public License, the
     11  1.1  mrg Free Software Foundation gives you unlimited permission to link the
     12  1.1  mrg compiled version of this file into combinations with other programs,
     13  1.1  mrg and to distribute those combinations without any restriction coming
     14  1.1  mrg from the use of this file.  (The General Public License restrictions
     15  1.1  mrg do apply in other respects; for example, they cover modification of
     16  1.1  mrg the file, and distribution when not linked into a combine
     17  1.1  mrg executable.)
     18  1.1  mrg 
     19  1.1  mrg This file is distributed in the hope that it will be useful, but
     20  1.1  mrg WITHOUT ANY WARRANTY; without even the implied warranty of
     21  1.1  mrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     22  1.1  mrg General Public License for more details.
     23  1.1  mrg 
     24  1.1  mrg You should have received a copy of the GNU General Public License
     25  1.1  mrg along with this program; see the file COPYING3.  If not see
     26  1.1  mrg <http://www.gnu.org/licenses/>.  */
     27  1.1  mrg 
     28  1.1  mrg /* Calculate division table for ARC700 integer division
     29  1.1  mrg    Contributed by Joern Rennecke
     30  1.1  mrg    joern.rennecke (at) arc.com  */
     31  1.1  mrg 
     32  1.1  mrg #include <stdio.h>
     33  1.1  mrg #include <math.h>
     34  1.1  mrg 
     35  1.1  mrg int
     36  1.1  mrg main ()
     37  1.1  mrg {
     38  1.1  mrg   int i, j;
     39  1.1  mrg   unsigned x;
     40  1.1  mrg   double q, r, err, max_err = -1;
     41  1.1  mrg 
     42  1.1  mrg   puts("/* This table has been generated by divtab-arc700.c.  */");
     43  1.1  mrg   puts("\
     44  1.1  mrg /* 1/512 .. 1/256, normalized.  There is a leading 1 in bit 31.\n\
     45  1.1  mrg    For powers of two, we list unnormalized numbers instead.  The values\n\
     46  1.1  mrg    for powers of 2 are loaded, but not used.  The value for 1 is actually\n\
     47  1.1  mrg    the first instruction after .Lmuldiv.  */\n\
     48  1.1  mrg 	.balign 4");
     49  1.1  mrg   puts (".Ldivtab:\n");
     50  1.1  mrg   for (i = 256; i >= 2; --i)
     51  1.1  mrg     {
     52  1.1  mrg       j = i < 0 ? -i : i;
     53  1.1  mrg       if (j & (j-1))
     54  1.1  mrg 	while (j < 128)
     55  1.1  mrg 	  j += j;
     56  1.1  mrg       else
     57  1.1  mrg 	/* Power of two. */
     58  1.1  mrg 	j *= 128;
     59  1.1  mrg       q = 4.*(1<<30)*128/j;
     60  1.1  mrg       r = ceil (q);
     61  1.1  mrg       printf ("\t.long\t0x%X\n", (unsigned) r);
     62  1.1  mrg       err = r - q;
     63  1.1  mrg       if (err > max_err)
     64  1.1  mrg 	max_err = err;
     65  1.1  mrg     }
     66  1.1  mrg #if 0
     67  1.1  mrg   printf ("\t/* maximum error: %f */\n", max_err);
     68  1.1  mrg #endif
     69  1.1  mrg   exit (0);
     70  1.1  mrg }
     71