sysdeps/sparc/sparc32/lshift.S

   1 ! Sparc __mpn_lshift --
   2 !
   3 ! Copyright (C) 1995-2014 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_lshift)
  31         sll     %o2,2,%g1
  32         add     %o1,%g1,%o1     ! make %o1 point at end of src
  33         ld      [%o1-4],%g2     ! load first limb
  34         sub     %g0,%o3,%o5     ! negate shift count
  35         add     %o0,%g1,%o0     ! make %o0 point at end of res
  36         add     %o2,-1,%o2
  37         andcc   %o2,4-1,%g4     ! number of limbs in first loop
  38         srl     %g2,%o5,%g1     ! compute function result
  39         be      LOC(0)          ! if multiple of 4 limbs, skip first loop
  40         st      %g1,[%sp+80]
  41
  42         sub     %o2,%g4,%o2     ! adjust count for main loop
  43
  44 LOC(loop0):
  45         ld      [%o1-8],%g3
  46         add     %o0,-4,%o0
  47         add     %o1,-4,%o1
  48         addcc   %g4,-1,%g4
  49         sll     %g2,%o3,%o4
  50         srl     %g3,%o5,%g1
  51         mov     %g3,%g2
  52         or      %o4,%g1,%o4
  53         bne     LOC(loop0)
  54          st     %o4,[%o0+0]
  55
  56 LOC(0): tst     %o2
  57         be      LOC(end)
  58          nop
  59
  60 LOC(loop):
  61         ld      [%o1-8],%g3
  62         add     %o0,-16,%o0
  63         addcc   %o2,-4,%o2
  64         sll     %g2,%o3,%o4
  65         srl     %g3,%o5,%g1
  66
  67         ld      [%o1-12],%g2
  68         sll     %g3,%o3,%g4
  69         or      %o4,%g1,%o4
  70         st      %o4,[%o0+12]
  71         srl     %g2,%o5,%g1
  72
  73         ld      [%o1-16],%g3
  74         sll     %g2,%o3,%o4
  75         or      %g4,%g1,%g4
  76         st      %g4,[%o0+8]
  77         srl     %g3,%o5,%g1
  78
  79         ld      [%o1-20],%g2
  80         sll     %g3,%o3,%g4
  81         or      %o4,%g1,%o4
  82         st      %o4,[%o0+4]
  83         srl     %g2,%o5,%g1
  84
  85         add     %o1,-16,%o1
  86         or      %g4,%g1,%g4
  87         bne     LOC(loop)
  88          st     %g4,[%o0+0]
  89
  90 LOC(end):
  91         sll     %g2,%o3,%g2
  92         st      %g2,[%o0-4]
  93         retl
  94         ld      [%sp+80],%o0
  95
  96 END(__mpn_lshift)