source/libs/gmp/gmp-src/mpn/pa64/rshift.asm

   1 dnl  HP-PA 2.0 mpn_rshift -- Right shift.
   2
   3 dnl  Copyright 1997, 2000, 2002, 2003 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
  32 dnl  This runs at 1.5 cycles/limb on PA8000 and 1.0 cycles/limb on PA8500.
  33
  34 include(`../config.m4')
  35
  36 dnl  INPUT PARAMETERS
  37 define(`rp',`%r26')
  38 define(`up',`%r25')
  39 define(`n',`%r24')
  40 define(`cnt',`%r23')
  41
  42 ifdef(`HAVE_ABI_2_0w',
  43 `       .level  2.0w
  44 ',`     .level  2.0
  45 ')
  46 PROLOGUE(mpn_rshift)
  47         mtsar           cnt
  48         ldd             0(up), %r21
  49         addib,=         -1, n, L(end)
  50         shrpd           %r21, %r0, %sar, %r29   C compute carry out limb
  51         depw,z          n, 31, 3, %r28          C r28 = (size & 7)
  52         sub             %r0, n, %r22
  53         depw,z          %r22, 28, 3, %r22       C r22 = 8 * (-size & 7)
  54         sub             up, %r22, up            C offset up
  55         blr             %r28, %r0               C branch into jump table
  56         sub             rp, %r22, rp            C offset rp
  57         b               L(0)
  58         nop
  59         b               L(1)
  60         copy            %r21, %r20
  61         b               L(2)
  62         nop
  63         b               L(3)
  64         copy            %r21, %r20
  65         b               L(4)
  66         nop
  67         b               L(5)
  68         copy            %r21, %r20
  69         b               L(6)
  70         nop
  71         b               L(7)
  72         copy            %r21, %r20
  73
  74 LDEF(loop)
  75 LDEF(0) ldd             8(up), %r20
  76         shrpd           %r20, %r21, %sar, %r21
  77         std             %r21, 0(rp)
  78 LDEF(7) ldd             16(up), %r21
  79         shrpd           %r21, %r20, %sar, %r20
  80         std             %r20, 8(rp)
  81 LDEF(6) ldd             24(up), %r20
  82         shrpd           %r20, %r21, %sar, %r21
  83         std             %r21, 16(rp)
  84 LDEF(5) ldd             32(up), %r21
  85         shrpd           %r21, %r20, %sar, %r20
  86         std             %r20, 24(rp)
  87 LDEF(4) ldd             40(up), %r20
  88         shrpd           %r20, %r21, %sar, %r21
  89         std             %r21, 32(rp)
  90 LDEF(3) ldd             48(up), %r21
  91         shrpd           %r21, %r20, %sar, %r20
  92         std             %r20, 40(rp)
  93 LDEF(2) ldd             56(up), %r20
  94         shrpd           %r20, %r21, %sar, %r21
  95         std             %r21, 48(rp)
  96 LDEF(1) ldd             64(up), %r21
  97         ldo             64(up), up
  98         shrpd           %r21, %r20, %sar, %r20
  99         std             %r20, 56(rp)
 100         addib,>         -8, n, L(loop)
 101         ldo             64(rp), rp
 102
 103 LDEF(end)
 104         shrpd           %r0, %r21, %sar, %r21
 105         std             %r21, 0(rp)
 106         bve             (%r2)
 107 ifdef(`HAVE_ABI_2_0w',
 108 `       copy            %r29,%r28
 109 ',`     extrd,u         %r29, 31, 32, %r28
 110 ')
 111 EPILOGUE(mpn_rshift)