1  /* Fat binary x86 gmp-mparam.h -- Compiler/machine parameter header file.
       2  
       3  Copyright 1991, 1993, 1994, 2000-2003, 2011 Free Software Foundation, Inc.
       4  
       5  This file is part of the GNU MP Library.
       6  
       7  The GNU MP Library is free software; you can redistribute it and/or modify
       8  it under the terms of either:
       9  
      10    * the GNU Lesser General Public License as published by the Free
      11      Software Foundation; either version 3 of the License, or (at your
      12      option) any later version.
      13  
      14  or
      15  
      16    * the GNU General Public License as published by the Free Software
      17      Foundation; either version 2 of the License, or (at your option) any
      18      later version.
      19  
      20  or both in parallel, as here.
      21  
      22  The GNU MP Library is distributed in the hope that it will be useful, but
      23  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      24  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      25  for more details.
      26  
      27  You should have received copies of the GNU General Public License and the
      28  GNU Lesser General Public License along with the GNU MP Library.  If not,
      29  see https://www.gnu.org/licenses/.  */
      30  
      31  #define GMP_LIMB_BITS 32
      32  #define GMP_LIMB_BYTES 4
      33  
      34  
      35  /* mpn_divexact_1 is faster than mpn_divrem_1 at all sizes.  The only time
      36     this might not be true currently is for actual 80386 and 80486 chips,
      37     where mpn/x86/dive_1.asm might be slower than mpn/x86/divrem_1.asm, but
      38     that's not worth worrying about.  */
      39  #define DIVEXACT_1_THRESHOLD  0
      40  
      41  /* Only some of the x86s have an mpn_preinv_divrem_1, but we set
      42     USE_PREINV_DIVREM_1 so that all callers use it, and then let the
      43     __gmpn_cpuvec pointer go to plain mpn_divrem_1 if there's not an actual
      44     preinv.  */
      45  #define USE_PREINV_DIVREM_1   1
      46  
      47  #define BMOD_1_TO_MOD_1_THRESHOLD           20
      48  
      49  /* mpn_sqr_basecase is faster than mpn_mul_basecase at all sizes, no need
      50     for mpn_sqr to call the latter.  */
      51  #define SQR_BASECASE_THRESHOLD 0
      52  
      53  /* Sensible fallbacks for these, when not taken from a cpu-specific
      54     gmp-mparam.h.  */
      55  #define MUL_TOOM22_THRESHOLD      20
      56  #define MUL_TOOM33_THRESHOLD     130
      57  #define SQR_TOOM2_THRESHOLD       30
      58  #define SQR_TOOM3_THRESHOLD      200
      59  
      60  /* These are values more or less in the middle of what the typical x86 chips
      61     come out as.  For a fat binary it's necessary to have values for these,
      62     since the defaults for MUL_FFT_TABLE and SQR_FFT_TABLE otherwise come out
      63     as non-constant array initializers.  FIXME: Perhaps these should be done
      64     in the cpuvec structure like other thresholds.  */
      65  #define MUL_FFT_TABLE  { 464, 928, 1920, 3584, 10240, 40960, 0 }
      66  #define MUL_FFT_MODF_THRESHOLD          400
      67  #define MUL_FFT_THRESHOLD              2000
      68  
      69  #define SQR_FFT_TABLE  { 528, 1184, 1920, 4608, 14336, 40960, 0 }
      70  #define SQR_FFT_MODF_THRESHOLD          500
      71  #define SQR_FFT_THRESHOLD              3000