source/libs/gmp/gmp-src/mpn/x86_64/fat/gmp-mparam.h

   1 /* Fat binary x86_64 gmp-mparam.h -- Compiler/machine parameter header file.
   2
   3 Copyright 1991, 1993, 1994, 2000-2003, 2009, 2011 Free Software Foundation,
   4 Inc.
   5
   6 This file is part of the GNU MP Library.
   7
   8 The GNU MP Library is free software; you can redistribute it and/or modify
   9 it under the terms of either:
  10
  11   * the GNU Lesser General Public License as published by the Free
  12     Software Foundation; either version 3 of the License, or (at your
  13     option) any later version.
  14
  15 or
  16
  17   * the GNU General Public License as published by the Free Software
  18     Foundation; either version 2 of the License, or (at your option) any
  19     later version.
  20
  21 or both in parallel, as here.
  22
  23 The GNU MP Library is distributed in the hope that it will be useful, but
  24 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  25 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  26 for more details.
  27
  28 You should have received copies of the GNU General Public License and the
  29 GNU Lesser General Public License along with the GNU MP Library.  If not,
  30 see https://www.gnu.org/licenses/.  */
  31
  32 #define GMP_LIMB_BITS 64
  33 #define GMP_LIMB_BYTES 8
  34
  35
  36 /* mpn_divexact_1 is faster than mpn_divrem_1 at all sizes.  The only time
  37    this might not be true currently is for actual 80386 and 80486 chips,
  38    where mpn/x86/dive_1.asm might be slower than mpn/x86/divrem_1.asm, but
  39    that's not worth worrying about.  */
  40 #define DIVEXACT_1_THRESHOLD  0
  41
  42 /* Only some of the x86s have an mpn_preinv_divrem_1, but we set
  43    USE_PREINV_DIVREM_1 so that all callers use it, and then let the
  44    __gmpn_cpuvec pointer go to plain mpn_divrem_1 if there's not an actual
  45    preinv.  */
  46 #define USE_PREINV_DIVREM_1   1
  47
  48 #define BMOD_1_TO_MOD_1_THRESHOLD           20
  49
  50 /* mpn_sqr_basecase is faster than mpn_mul_basecase at all sizes, no need
  51    for mpn_sqr to call the latter.  */
  52 #define SQR_BASECASE_THRESHOLD 0
  53
  54 /* Sensible fallbacks for these, when not taken from a cpu-specific
  55    gmp-mparam.h.  */
  56 #define MUL_TOOM22_THRESHOLD      20
  57 #define MUL_TOOM33_THRESHOLD     130
  58 #define SQR_TOOM2_THRESHOLD       30
  59 #define SQR_TOOM3_THRESHOLD      200
  60
  61 /* These are values more or less in the middle of what the typical x86 chips
  62    come out as.  For a fat binary it's necessary to have values for these,
  63    since the defaults for MUL_FFT_TABLE and SQR_FFT_TABLE otherwise come out
  64    as non-constant array initializers.  FIXME: Perhaps these should be done
  65    in the cpuvec structure like other thresholds.  */
  66 #define MUL_FFT_TABLE  { 464, 928, 1920, 3584, 10240, 40960, 0 }
  67 #define MUL_FFT_MODF_THRESHOLD          400
  68 #define MUL_FFT_THRESHOLD              2000
  69
  70 #define SQR_FFT_TABLE  { 528, 1184, 1920, 4608, 14336, 40960, 0 }
  71 #define SQR_FFT_MODF_THRESHOLD          500
  72 #define SQR_FFT_THRESHOLD              3000