sysdeps/x86_64/multiarch/strcat.S

   1 /* Multiple versions of strcat
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2009-2014 Free Software Foundation, Inc.
   4    Contributed by Intel Corporation.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <sysdep.h>
  22 #include <init-arch.h>
  23
  24 #ifndef USE_AS_STRNCAT
  25 # ifndef STRCAT
  26 #  define STRCAT strcat
  27 # endif
  28 #endif
  29
  30 #ifdef USE_AS_STRNCAT
  31 # define STRCAT_SSSE3                   __strncat_ssse3
  32 # define STRCAT_SSE2                    __strncat_sse2
  33 # define STRCAT_SSE2_UNALIGNED          __strncat_sse2_unaligned
  34 # define __GI_STRCAT                    __GI_strncat
  35 # define __GI___STRCAT              __GI___strncat
  36 #else
  37 # define STRCAT_SSSE3                   __strcat_ssse3
  38 # define STRCAT_SSE2                    __strcat_sse2
  39 # define STRCAT_SSE2_UNALIGNED          __strcat_sse2_unaligned
  40 # define __GI_STRCAT                    __GI_strcat
  41 # define __GI___STRCAT              __GI___strcat
  42 #endif
  43
  44
  45 /* Define multiple versions only for the definition in libc.  */
  46 #if IS_IN (libc)
  47         .text
  48 ENTRY(STRCAT)
  49         .type   STRCAT, @gnu_indirect_function
  50         cmpl    $0, __cpu_features+KIND_OFFSET(%rip)
  51         jne     1f
  52         call    __init_cpu_features
  53 1:      leaq    STRCAT_SSE2_UNALIGNED(%rip), %rax
  54         testl   $bit_Fast_Unaligned_Load, __cpu_features+FEATURE_OFFSET+index_Fast_Unaligned_Load(%rip)
  55         jnz     2f
  56         leaq    STRCAT_SSE2(%rip), %rax
  57         testl   $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
  58         jz      2f
  59         leaq    STRCAT_SSSE3(%rip), %rax
  60 2:      ret
  61 END(STRCAT)
  62
  63 # undef ENTRY
  64 # define ENTRY(name) \
  65         .type STRCAT_SSE2, @function; \
  66         .align 16; \
  67         .globl STRCAT_SSE2; \
  68         .hidden STRCAT_SSE2; \
  69         STRCAT_SSE2: cfi_startproc; \
  70         CALL_MCOUNT
  71 # undef END
  72 # define END(name) \
  73         cfi_endproc; .size STRCAT_SSE2, .-STRCAT_SSE2
  74 # undef libc_hidden_builtin_def
  75 /* It doesn't make sense to send libc-internal strcat calls through a PLT.
  76    The speedup we get from using SSSE3 instruction is likely eaten away
  77    by the indirect call in the PLT.  */
  78 # define libc_hidden_builtin_def(name) \
  79         .globl __GI_STRCAT; __GI_STRCAT = STRCAT_SSE2
  80 # undef libc_hidden_def
  81 # define libc_hidden_def(name) \
  82         .globl __GI___STRCAT; __GI___STRCAT = STRCAT_SSE2
  83 #endif
  84
  85 #ifndef USE_AS_STRNCAT
  86 # include "../strcat.S"
  87 #endif