source/libs/gmp/gmp-src/mpn/sparc64/rshift.asm

   1 dnl  SPARC v9 mpn_rshift
   2
   3 dnl  Contributed to the GNU project by David Miller.
   4
   5 dnl  Copyright 2013 Free Software Foundation, Inc.
   6
   7 dnl  This file is part of the GNU MP Library.
   8 dnl
   9 dnl  The GNU MP Library is free software; you can redistribute it and/or modify
  10 dnl  it under the terms of either:
  11 dnl
  12 dnl    * the GNU Lesser General Public License as published by the Free
  13 dnl      Software Foundation; either version 3 of the License, or (at your
  14 dnl      option) any later version.
  15 dnl
  16 dnl  or
  17 dnl
  18 dnl    * the GNU General Public License as published by the Free Software
  19 dnl      Foundation; either version 2 of the License, or (at your option) any
  20 dnl      later version.
  21 dnl
  22 dnl  or both in parallel, as here.
  23 dnl
  24 dnl  The GNU MP Library is distributed in the hope that it will be useful, but
  25 dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  26 dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  27 dnl  for more details.
  28 dnl
  29 dnl  You should have received copies of the GNU General Public License and the
  30 dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
  31 dnl  see https://www.gnu.org/licenses/.
  32
  33 include(`../config.m4')
  34
  35 C                   cycles/limb
  36 C UltraSPARC 1&2:        2
  37 C UltraSPARC 3:          2.5
  38 C UltraSPARC T1:        17.5
  39 C UltraSPARC T3:         8
  40 C UltraSPARC T4:         3
  41
  42 C INPUT PARAMETERS
  43 define(`rp',     `%i0')
  44 define(`up',     `%i1')
  45 define(`n',      `%i2')
  46 define(`cnt',    `%i3')
  47
  48 define(`tcnt',   `%i4')
  49 define(`retval', `%i5')
  50 define(`u0',     `%l0')
  51 define(`u1',     `%l1')
  52 define(`r0',     `%l6')
  53 define(`r1',     `%l7')
  54 define(`u0_off', `%o0')
  55 define(`u1_off', `%o1')
  56 define(`r0_off', `%o2')
  57 define(`r1_off', `%o3')
  58
  59 ASM_START()
  60         REGISTER(%g2,#scratch)
  61         REGISTER(%g3,#scratch)
  62 PROLOGUE(mpn_rshift)
  63         save    %sp, -176, %sp
  64
  65         sllx    n, 3, n
  66         sub     %g0, cnt, tcnt
  67
  68         add     up, n, up
  69         add     rp, n, rp
  70
  71         neg     n, n
  72         sub     up, (2 * 8), u0_off
  73         sub     rp, (5 * 8), r0_off
  74
  75         ldx     [n + up], u1            C WAS: up + 0
  76         sub     u0_off, (1 * 8), u1_off
  77         sub     r0_off, (1 * 8), r1_off
  78
  79         subcc   n, -(3 * 8), n
  80         sllx    u1, tcnt, retval
  81
  82         bg,pn   %xcc, L(end12)
  83          srlx   u1, cnt, %l3
  84
  85         ldx     [n + u0_off], u0        C WAS: up + 0
  86         subcc   n, -(2 * 8), n
  87
  88         ldx     [n + u1_off], u1        C WAS: up + 8
  89
  90         bg,pn   %xcc, L(end34)
  91          sllx   u0, tcnt, %l4
  92
  93         b,a     L(top)
  94         ALIGN(16)
  95 L(top):
  96         srlx    u0, cnt, %l2
  97         or      %l3, %l4, r0
  98
  99         ldx     [n + u0_off], u0        C WAS: up + 0
 100         sllx    u1, tcnt, %l5
 101
 102         stx     r0, [n + r0_off]        C WAS: rp + 0
 103         subcc   n, -(2 * 8), n
 104
 105         srlx    u1, cnt, %l3
 106         or      %l2, %l5, r1
 107
 108         ldx     [n + u1_off], u1        C WAS: up + 8
 109         sllx    u0, tcnt, %l4
 110
 111         ble,pt  %xcc, L(top)
 112          stx    r1, [n + r1_off]        C WAS: rp + 8
 113
 114 L(end34):
 115         srlx    u0, cnt, %l2
 116         or      %l3, %l4, r0
 117
 118         sllx    u1, tcnt, %l5
 119         stx     r0, [n + r0_off]        C WAS: rp + 0
 120
 121         or      %l2, %l5, r1
 122         sub     n, -(2 * 8), %o5
 123
 124         srlx    u1, cnt, %l3
 125         stx     r1, [%o5 + r1_off]      C WAS: rp + 8
 126
 127 L(end12):
 128         andcc   n, 8, %g0
 129         bz,pn   %xcc, L(done)
 130          nop
 131
 132         ldx     [n + u0_off], u1
 133         sllx    u1, tcnt, %l4
 134         or      %l3, %l4, r0
 135         stx     r0, [r0_off + 24]
 136         srlx    u1, cnt, %l3
 137 L(done):
 138         stx     %l3, [r0_off + 32]
 139
 140         ret
 141         restore retval, 0, %o0
 142 EPILOGUE()