source/libs/gmp/gmp-src/mpn/s390_32/esame/aorslsh1_n.asm

   1 dnl  S/390-32 mpn_addlsh1_n
   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 include(`../config.m4')
  32
  33 C            cycles/limb
  34 C z900           9.25
  35 C z990           5
  36 C z9             ?
  37 C z10            ?
  38 C z196           ?
  39
  40 C TODO
  41 C  * Optimise for small n
  42 C  * Compute RETVAL for sublsh1_n less stupidly
  43
  44 C INPUT PARAMETERS
  45 define(`rp',    `%r2')
  46 define(`up',    `%r3')
  47 define(`vp',    `%r4')
  48 define(`n',     `%r5')
  49
  50 ifdef(`OPERATION_addlsh1_n',`
  51   define(ADDSUBC,       alr)
  52   define(ADDSUBE,       alcr)
  53   define(INITCY,        `lhi    %r13, -1')
  54   define(RETVAL,        `alr    %r1, %r13
  55                         lhi     %r2, 2
  56                         alr     %r2, %r1')
  57   define(func, mpn_addlsh1_n)
  58 ')
  59 ifdef(`OPERATION_sublsh1_n',`
  60   define(ADDSUBC,       slr)
  61   define(ADDSUBE,       slbr)
  62   define(INITCY,        `lhi    %r13, 0')
  63   define(RETVAL,        `slr    %r1, %r13
  64                         lhi     %r2, 1
  65                         alr     %r2, %r1')
  66   define(func, mpn_sublsh1_n)
  67 ')
  68
  69 MULFUNC_PROLOGUE(mpn_addlsh1_n mpn_sublsh1_n)
  70
  71 ASM_START()
  72 PROLOGUE(func)
  73         stm     %r6, %r13, 24(%r15)
  74
  75         la      %r0, 3(n)
  76         lhi     %r7, 3
  77         srl     %r0, 2
  78         nr      %r7, n                  C n mod 4
  79         je      L(b0)
  80         chi     %r7, 2
  81         jl      L(b1)
  82         je      L(b2)
  83
  84 L(b3):  lm      %r5, %r7, 0(up)
  85         la      up, 12(up)
  86         lm      %r9, %r11, 0(vp)
  87         la      vp, 12(vp)
  88
  89         alr     %r9, %r9
  90         alcr    %r10, %r10
  91         alcr    %r11, %r11
  92         slbr    %r1, %r1
  93
  94         ADDSUBC %r5, %r9
  95         ADDSUBE %r6, %r10
  96         ADDSUBE %r7, %r11
  97         slbr    %r13, %r13
  98
  99         stm     %r5, %r7, 0(rp)
 100         la      rp, 12(rp)
 101         brct    %r0, L(top)
 102         j       L(end)
 103
 104 L(b0):  lhi     %r1, -1
 105         INITCY
 106         j       L(top)
 107
 108 L(b1):  l       %r5, 0(up)
 109         la      up, 4(up)
 110         l       %r9, 0(vp)
 111         la      vp, 4(vp)
 112
 113         alr     %r9, %r9
 114         slbr    %r1, %r1
 115         ADDSUBC %r5, %r9
 116         slbr    %r13, %r13
 117
 118         st      %r5, 0(rp)
 119         la      rp, 4(rp)
 120         brct    %r0, L(top)
 121         j       L(end)
 122
 123 L(b2):  lm      %r5, %r6, 0(up)
 124         la      up, 8(up)
 125         lm      %r9, %r10, 0(vp)
 126         la      vp, 8(vp)
 127
 128         alr     %r9, %r9
 129         alcr    %r10, %r10
 130         slbr    %r1, %r1
 131
 132         ADDSUBC %r5, %r9
 133         ADDSUBE %r6, %r10
 134         slbr    %r13, %r13
 135
 136         stm     %r5, %r6, 0(rp)
 137         la      rp, 8(rp)
 138         brct    %r0, L(top)
 139         j       L(end)
 140
 141 L(top): lm      %r9, %r12, 0(vp)
 142         la      vp, 16(vp)
 143
 144         ahi     %r1, 1                  C restore carry
 145
 146         alcr    %r9, %r9
 147         alcr    %r10, %r10
 148         alcr    %r11, %r11
 149         alcr    %r12, %r12
 150
 151         slbr    %r1, %r1                C save carry
 152
 153         lm      %r5, %r8, 0(up)
 154         la      up, 16(up)
 155
 156         ahi     %r13, 1                 C restore carry
 157
 158         ADDSUBE %r5, %r9
 159         ADDSUBE %r6, %r10
 160         ADDSUBE %r7, %r11
 161         ADDSUBE %r8, %r12
 162
 163         slbr    %r13, %r13
 164
 165         stm     %r5, %r8, 0(rp)
 166         la      rp, 16(rp)
 167         brct    %r0, L(top)
 168
 169 L(end):
 170         RETVAL
 171         lm      %r6, %r13, 24(%r15)
 172         br      %r14
 173 EPILOGUE()