source/libs/gmp/gmp-src/mpn/s390_32/copyd.asm

   1 dnl  S/390-32 mpn_copyd
   2
   3 dnl  Copyright 2011 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 include(`../config.m4')
  33
  34 C            cycles/limb
  35 C            cycles/limb
  36 C z900           1.65
  37 C z990           1.125
  38 C z9             ?
  39 C z10            ?
  40 C z196           ?
  41
  42 C FIXME:
  43 C  * Avoid saving/restoring callee-saves registers for n < 3.  This could be
  44 C    done by setting rp=r1, up=r2, i=r0 and r3,r4,r5 for clock regs.
  45 C    We could then use r3...r10 in main loop.
  46
  47 C INPUT PARAMETERS
  48 define(`rp_param',      `%r2')
  49 define(`up_param',      `%r3')
  50 define(`n',             `%r4')
  51
  52 define(`rp',    `%r8')
  53 define(`up',    `%r9')
  54
  55 ASM_START()
  56 PROLOGUE(mpn_copyd)
  57         stm     %r6, %r11, 24(%r15)
  58
  59         lr      %r1, n
  60         sll     %r1, 2
  61         la      %r10, 8(n)
  62         ahi     %r1, -32
  63         srl     %r10, 3
  64         lhi     %r11, -32
  65
  66         la      rp, 0(%r1,rp_param)     C FIXME use lay on z990 and later
  67         la      up, 0(%r1,up_param)     C FIXME use lay on z990 and later
  68
  69         lhi     %r7, 7
  70         nr      %r7, n                  C n mod 8
  71         chi     %r7, 2
  72         jh      L(b34567)
  73         chi     %r7, 1
  74         je      L(b1)
  75         jh      L(b2)
  76
  77 L(b0):  brct    %r10, L(top)
  78         j       L(end)
  79
  80 L(b1):  l       %r0, 28(up)
  81         ahi     up, -4
  82         st      %r0, 28(rp)
  83         ahi     rp, -4
  84         brct    %r10, L(top)
  85         j       L(end)
  86
  87 L(b2):  lm      %r0, %r1, 24(up)
  88         ahi     up, -8
  89         stm     %r0, %r1, 24(rp)
  90         ahi     rp, -8
  91         brct    %r10, L(top)
  92         j       L(end)
  93
  94 L(b34567):
  95         chi     %r7, 4
  96         jl      L(b3)
  97         je      L(b4)
  98         chi     %r7, 6
  99         je      L(b6)
 100         jh      L(b7)
 101
 102 L(b5):  lm      %r0, %r4, 12(up)
 103         ahi     up, -20
 104         stm     %r0, %r4, 12(rp)
 105         ahi     rp, -20
 106         brct    %r10, L(top)
 107         j       L(end)
 108
 109 L(b3):  lm      %r0, %r2, 20(up)
 110         ahi     up, -12
 111         stm     %r0, %r2, 20(rp)
 112         ahi     rp, -12
 113         brct    %r10, L(top)
 114         j       L(end)
 115
 116 L(b4):  lm      %r0, %r3, 16(up)
 117         ahi     up, -16
 118         stm     %r0, %r3, 16(rp)
 119         ahi     rp, -16
 120         brct    %r10, L(top)
 121         j       L(end)
 122
 123 L(b6):  lm      %r0, %r5, 8(up)
 124         ahi     up, -24
 125         stm     %r0, %r5, 8(rp)
 126         ahi     rp, -24
 127         brct    %r10, L(top)
 128         j       L(end)
 129
 130 L(b7):  lm      %r0, %r6, 4(up)
 131         ahi     up, -28
 132         stm     %r0, %r6, 4(rp)
 133         ahi     rp, -28
 134         brct    %r10, L(top)
 135         j       L(end)
 136
 137 L(top): lm      %r0, %r7, 0(up)
 138         la      up, 0(%r11,up)
 139         stm     %r0, %r7, 0(rp)
 140         la      rp, 0(%r11,rp)
 141         brct    %r10, L(top)
 142
 143 L(end): lm      %r6, %r11, 24(%r15)
 144         br      %r14
 145 EPILOGUE()