sysdeps/sparc/sparc32/rshift.S

   1 ! sparc __mpn_rshift --
   2 !
   3 ! Copyright (C) 1995-2019 Free Software Foundation, Inc.
   4 !
   5 ! This file is part of the GNU MP Library.
   6 !
   7 ! The GNU MP Library is free software; you can redistribute it and/or modify
   8 ! it under the terms of the GNU Lesser General Public License as published by
   9 ! the Free Software Foundation; either version 2.1 of the License, or (at your
  10 ! option) any later version.
  11 !
  12 ! The GNU MP Library is distributed in the hope that it will be useful, but
  13 ! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 ! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15 ! License for more details.
  16 !
  17 ! You should have received a copy of the GNU Lesser General Public License
  18 ! along with the GNU MP Library; see the file COPYING.LIB.  If not,
  19 ! see <http://www.gnu.org/licenses/>.
  20
  21
  22 ! INPUT PARAMETERS
  23 ! RES_PTR       %o0
  24 ! SRC_PTR       %o1
  25 ! SIZE          %o2
  26 ! CNT           %o3
  27
  28 #include <sysdep.h>
  29
  30 ENTRY(__mpn_rshift)
  31         ld      [%o1],%g2       ! load first limb
  32         sub     %g0,%o3,%o5     ! negate shift count
  33         add     %o2,-1,%o2
  34         andcc   %o2,4-1,%g4     ! number of limbs in first loop
  35         sll     %g2,%o5,%g1     ! compute function result
  36         be      LOC(0)          ! if multiple of 4 limbs, skip first loop
  37         st      %g1,[%sp+80]
  38
  39         sub     %o2,%g4,%o2     ! adjust count for main loop
  40
  41 LOC(loop0):
  42         ld      [%o1+4],%g3
  43         add     %o0,4,%o0
  44         add     %o1,4,%o1
  45         addcc   %g4,-1,%g4
  46         srl     %g2,%o3,%o4
  47         sll     %g3,%o5,%g1
  48         mov     %g3,%g2
  49         or      %o4,%g1,%o4
  50         bne     LOC(loop0)
  51          st     %o4,[%o0-4]
  52
  53 LOC(0): tst     %o2
  54         be      LOC(end)
  55          nop
  56
  57 LOC(loop):
  58         ld      [%o1+4],%g3
  59         add     %o0,16,%o0
  60         addcc   %o2,-4,%o2
  61         srl     %g2,%o3,%o4
  62         sll     %g3,%o5,%g1
  63
  64         ld      [%o1+8],%g2
  65         srl     %g3,%o3,%g4
  66         or      %o4,%g1,%o4
  67         st      %o4,[%o0-16]
  68         sll     %g2,%o5,%g1
  69
  70         ld      [%o1+12],%g3
  71         srl     %g2,%o3,%o4
  72         or      %g4,%g1,%g4
  73         st      %g4,[%o0-12]
  74         sll     %g3,%o5,%g1
  75
  76         ld      [%o1+16],%g2
  77         srl     %g3,%o3,%g4
  78         or      %o4,%g1,%o4
  79         st      %o4,[%o0-8]
  80         sll     %g2,%o5,%g1
  81
  82         add     %o1,16,%o1
  83         or      %g4,%g1,%g4
  84         bne     LOC(loop)
  85          st     %g4,[%o0-4]
  86
  87 LOC(end):
  88         srl     %g2,%o3,%g2
  89         st      %g2,[%o0-0]
  90         retl
  91         ld      [%sp+80],%o0
  92
  93 END(__mpn_rshift)