sysdeps/i386/i686/multiarch/strcpy.S

   1 /* Multiple versions of strcpy
   2    Copyright (C) 2011-2012 Free Software Foundation, Inc.
   3    Contributed by Intel Corporation.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21 #include <init-arch.h>
  22
  23 #if !defined (USE_AS_STPCPY) && !defined (USE_AS_STRNCPY)
  24 # ifndef STRCPY
  25 #  define STRCPY strcpy
  26 # endif
  27 #endif
  28
  29 #ifdef USE_AS_STPCPY
  30 # ifdef USE_AS_STRNCPY
  31 #  define STRCPY_SSSE3  __stpncpy_ssse3
  32 #  define STRCPY_SSE2           __stpncpy_sse2
  33 #  define STRCPY_IA32           __stpncpy_ia32
  34 #  define __GI_STRCPY           __GI_stpncpy
  35 #  define __GI___STRCPY         __GI___stpncpy
  36 # else
  37 #  define STRCPY_SSSE3  __stpcpy_ssse3
  38 #  define STRCPY_SSE2           __stpcpy_sse2
  39 #  define STRCPY_IA32           __stpcpy_ia32
  40 #  define __GI_STRCPY           __GI_stpcpy
  41 #  define __GI___STRCPY         __GI___stpcpy
  42 # endif
  43 #else
  44 # ifdef USE_AS_STRNCPY
  45 #  define STRCPY_SSSE3  __strncpy_ssse3
  46 #  define STRCPY_SSE2           __strncpy_sse2
  47 #  define STRCPY_IA32           __strncpy_ia32
  48 #  define __GI_STRCPY           __GI_strncpy
  49 # else
  50 #  define STRCPY_SSSE3  __strcpy_ssse3
  51 #  define STRCPY_SSE2           __strcpy_sse2
  52 #  define STRCPY_IA32           __strcpy_ia32
  53 #  define __GI_STRCPY           __GI_strcpy
  54 # endif
  55 #endif
  56
  57
  58 /* Define multiple versions only for the definition in libc.  Don't
  59    define multiple versions for strncpy in static library since we
  60    need strncpy before the initialization happened.  */
  61 #ifndef NOT_IN_libc
  62
  63 # ifdef SHARED
  64         .text
  65 ENTRY(STRCPY)
  66         .type   STRCPY, @gnu_indirect_function
  67         pushl   %ebx
  68         cfi_adjust_cfa_offset (4)
  69         cfi_rel_offset (ebx, 0)
  70         LOAD_PIC_REG(bx)
  71         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  72         jne     1f
  73         call    __init_cpu_features
  74 1:      leal    STRCPY_IA32@GOTOFF(%ebx), %eax
  75         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
  76         jz      2f
  77         leal    STRCPY_SSE2@GOTOFF(%ebx), %eax
  78         testl   $bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features@GOTOFF(%ebx)
  79         jnz     2f
  80         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features@GOTOFF(%ebx)
  81         jz      2f
  82         leal    STRCPY_SSSE3@GOTOFF(%ebx), %eax
  83 2:      popl    %ebx
  84         cfi_adjust_cfa_offset (-4)
  85         cfi_restore (ebx)
  86         ret
  87 END(STRCPY)
  88 # else
  89
  90 ENTRY(STRCPY)
  91         .type   STRCPY, @gnu_indirect_function
  92         cmpl    $0, KIND_OFFSET+__cpu_features
  93         jne     1f
  94         call    __init_cpu_features
  95 1:      leal    STRCPY_IA32, %eax
  96         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features
  97         jz      2f
  98         leal    STRCPY_SSE2, %eax
  99         testl   $bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features
 100         jnz     2f
 101         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features
 102         jz      2f
 103         leal    STRCPY_SSSE3, %eax
 104 2:      ret
 105 END(STRCPY)
 106
 107 # endif
 108
 109 # undef ENTRY
 110 # define ENTRY(name) \
 111         .type STRCPY_IA32, @function; \
 112         .align 16; \
 113         STRCPY_IA32: cfi_startproc; \
 114         CALL_MCOUNT
 115 # undef END
 116 # define END(name) \
 117         cfi_endproc; .size STRCPY_IA32, .-STRCPY_IA32
 118
 119 # ifdef SHARED
 120 #  undef libc_hidden_builtin_def
 121 /* It doesn't make sense to send libc-internal strcpy calls through a PLT.
 122    The speedup we get from using SSSE3 instruction is likely eaten away
 123    by the indirect call in the PLT.  */
 124 #  define libc_hidden_builtin_def(name) \
 125         .globl __GI_STRCPY; __GI_STRCPY = STRCPY_IA32
 126 #  undef libc_hidden_def
 127 #  define libc_hidden_def(name) \
 128         .globl __GI___STRCPY; __GI___STRCPY = STRCPY_IA32
 129
 130 # endif
 131 #endif
 132
 133 #ifdef USE_AS_STPCPY
 134 # ifdef USE_AS_STRNCPY
 135 #  include "../../stpncpy.S"
 136 # else
 137 #  include "../../i586/stpcpy.S"
 138 # endif
 139 #else
 140 # ifndef USE_AS_STRNCPY
 141 #  include "../../i586/strcpy.S"
 142 # endif
 143 #endif