source/libs/gmp/gmp-src/mpn/sparc64/ultrasparct3/mod_34lsub1.asm

   1 dnl  SPARC v9 mpn_mod_34lsub1 for T3/T4/T5.
   2
   3 dnl  Copyright 2005, 2013 Free Software Foundation, Inc.
   4
   5 dnl  This file is part of the GNU MP Library.
   6 dnl
   7 dnl  The GNU MP Library is free software; you can redistribute it and/or modify
   8 dnl  it under the terms of either:
   9 dnl
  10 dnl    * the GNU Lesser General Public License as published by the Free
  11 dnl      Software Foundation; either version 3 of the License, or (at your
  12 dnl      option) any later version.
  13 dnl
  14 dnl  or
  15 dnl
  16 dnl    * the GNU General Public License as published by the Free Software
  17 dnl      Foundation; either version 2 of the License, or (at your option) any
  18 dnl      later version.
  19 dnl
  20 dnl  or both in parallel, as here.
  21 dnl
  22 dnl  The GNU MP Library is distributed in the hope that it will be useful, but
  23 dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  24 dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  25 dnl  for more details.
  26 dnl
  27 dnl  You should have received copies of the GNU General Public License and the
  28 dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
  29 dnl  see https://www.gnu.org/licenses/.
  30
  31 include(`../config.m4')
  32
  33 C                   cycles/limb
  34 C UltraSPARC T1:         -
  35 C UltraSPARC T3:         5
  36 C UltraSPARC T4:         1.57
  37
  38 C This is based on the powerpc64/mode64 code.
  39
  40 C INPUT PARAMETERS
  41 define(`up', `%i0')
  42 define(`n',  `%i1')
  43
  44 ASM_START()
  45         REGISTER(%g2,#scratch)
  46         REGISTER(%g3,#scratch)
  47 PROLOGUE(mpn_mod_34lsub1)
  48         save    %sp, -176, %sp
  49
  50         mov     0, %g1
  51         mov     0, %g3
  52         mov     0, %g4
  53         addcc   %g0, 0, %g5
  54
  55         add     n, -3, n
  56         brlz    n, L(lt3)
  57          nop
  58
  59         add     n, -3, n
  60         ldx     [up+0], %l5
  61         ldx     [up+8], %l6
  62         ldx     [up+16], %l7
  63         brlz    n, L(end)
  64          add    up, 24, up
  65
  66         ALIGN(16)
  67 L(top): addxccc(%g1, %l5, %g1)
  68         ldx     [up+0], %l5
  69         addxccc(%g3, %l6, %g3)
  70         ldx     [up+8], %l6
  71         addxccc(%g4, %l7, %g4)
  72         ldx     [up+16], %l7
  73         add     n, -3, n
  74         brgez   n, L(top)
  75          add    up, 24, up
  76
  77 L(end): addxccc(        %g1, %l5, %g1)
  78         addxccc(%g3, %l6, %g3)
  79         addxccc(%g4, %l7, %g4)
  80         addxc(  %g5, %g0, %g5)
  81
  82 L(lt3): cmp     n, -2
  83         blt     L(2)
  84          nop
  85
  86         ldx     [up+0], %l5
  87         mov     0, %l6
  88         beq     L(1)
  89          addcc  %g1, %l5, %g1
  90
  91         ldx     [up+8], %l6
  92 L(1):   addxccc(%g3, %l6, %g3)
  93         addxccc(%g4, %g0, %g4)
  94         addxc(  %g5, %g0, %g5)
  95
  96 L(2):   sllx    %g1, 16, %l0
  97         srlx    %l0, 16, %l0            C %l0 = %g1 mod 2^48
  98         srlx    %g1, 48, %l3            C %l3 = %g1 div 2^48
  99         srl     %g3, 0, %g1
 100         sllx    %g1, 16, %l4            C %l4 = (%g3 mod 2^32) << 16
 101         srlx    %g3, 32, %l5            C %l5 = %g3 div 2^32
 102         sethi   %hi(0xffff0000), %g1
 103         andn    %g4, %g1, %g1
 104         sllx    %g1, 32, %l6            C %l6 = (%g4 mod 2^16) << 32
 105         srlx    %g4, 16, %l7            C %l7 = %g4 div 2^16
 106
 107         add     %l0, %l3, %l0
 108         add     %l4, %l5, %l4
 109         add     %l6, %l7, %l6
 110
 111         add     %l0, %l4, %l0
 112         add     %l6, %g5, %l6
 113
 114         add     %l0, %l6, %i0
 115         ret
 116          restore
 117 EPILOGUE()