sysdeps/sparc/sparc64/strlen.S

   1 /* Determine the length of a string.  For SPARC v9.
   2    Copyright (C) 1998-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jan Vondrák <jvon4518@ss1000.ms.mff.cuni.cz>,
   5                   Jakub Jelinek <jj@ultra.linux.cz>, and
   6                   David S. Miller <davem@davemloft.net>.
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #include <sysdep.h>
  23
  24         .register       %g2, #scratch
  25         .register       %g3, #scratch
  26
  27         .text
  28         .align          32
  29 ENTRY(strlen)
  30         mov     %o0, %o1
  31         andn    %o0, 0x7, %o0
  32
  33         ldx     [%o0], %o5
  34         and     %o1, 0x7, %g1
  35         mov     -1, %g5
  36
  37         sethi   %hi(0x01010101), %o2
  38         sll     %g1, 3, %g1
  39
  40         or      %o2, %lo(0x01010101), %o2
  41         srlx    %g5, %g1, %o3
  42
  43         sllx    %o2, 32, %g1
  44         sethi   %hi(0x0000ff00), %g5
  45
  46         orn     %o5, %o3, %o5
  47         or      %o2, %g1, %o2
  48
  49         sllx    %o2, 7, %o3
  50 10:     add     %o0, 8, %o0
  51
  52         andn    %o3, %o5, %g1
  53         sub     %o5, %o2, %g2
  54
  55         andcc   %g1, %g2, %g0
  56         be,a,pt %xcc, 10b
  57          ldx    [%o0], %o5
  58         srlx    %o5, 32, %g1
  59
  60         andn    %o3, %g1, %o4
  61         sub     %g1, %o2, %g2
  62
  63         add     %o0, 4, %g3
  64         andcc   %o4, %g2, %g0
  65         movne   %icc, %g1, %o5
  66
  67         move    %icc, %g3, %o0
  68         or      %g5, %lo(0x0000ff00), %g5
  69         mov     3 - 8, %g2
  70
  71         andcc   %o5, %g5, %g0
  72         srlx    %o5, 16, %g1
  73         move    %icc, 2 - 8, %g2
  74
  75         andcc   %g1, 0xff, %g0
  76         srl     %o5, 24, %o5
  77         move    %icc, 1 - 8, %g2
  78
  79         movrz   %o5, 0 - 8, %g2
  80         sub     %o0, %o1, %o0
  81
  82         retl
  83          add    %o0, %g2, %o0
  84 END(strlen)
  85 libc_hidden_builtin_def (strlen)