sysdeps/i386/i686/multiarch/strcmp.S

   1 /* Multiple versions of strcmp
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2010-2017 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 #ifdef USE_AS_STRNCMP
  25 # define STRCMP                 strncmp
  26 # define __GI_STRCMP            __GI_strncmp
  27 # define __STRCMP_IA32          __strncmp_ia32
  28 # define __STRCMP_SSSE3         __strncmp_ssse3
  29 # define __STRCMP_SSE4_2        __strncmp_sse4_2
  30 #elif defined USE_AS_STRCASECMP_L
  31 # define STRCMP                 __strcasecmp_l
  32 # define __GI_STRCMP            __GI_strcasecmp_l
  33 # define __STRCMP_IA32          __strcasecmp_l_ia32
  34 # define __STRCMP_SSSE3         __strcasecmp_l_ssse3
  35 # define __STRCMP_SSE4_2        __strcasecmp_l_sse4_2
  36 #elif defined USE_AS_STRNCASECMP_L
  37 # define STRCMP                 __strncasecmp_l
  38 # define __GI_STRCMP            __GI_strncasecmp_l
  39 # define __STRCMP_IA32          __strncasecmp_l_ia32
  40 # define __STRCMP_SSSE3         __strncasecmp_l_ssse3
  41 # define __STRCMP_SSE4_2        __strncasecmp_l_sse4_2
  42 #else
  43 # define STRCMP                 strcmp
  44 # define __GI_STRCMP            __GI_strcmp
  45 # define __STRCMP_IA32          __strcmp_ia32
  46 # define __STRCMP_SSSE3         __strcmp_ssse3
  47 # define __STRCMP_SSE4_2        __strcmp_sse4_2
  48 #endif
  49
  50 /* Define multiple versions only for the definition in libc.  Don't
  51    define multiple versions for strncmp in static library since we
  52    need strncmp before the initialization happened.  */
  53 #if (defined SHARED || !defined USE_AS_STRNCMP) && IS_IN (libc)
  54         .text
  55 ENTRY(STRCMP)
  56         .type   STRCMP, @gnu_indirect_function
  57         LOAD_GOT_AND_RTLD_GLOBAL_RO
  58         LOAD_FUNC_GOT_EAX (__STRCMP_IA32)
  59         HAS_CPU_FEATURE (SSSE3)
  60         jz      2f
  61         LOAD_FUNC_GOT_EAX (__STRCMP_SSSE3)
  62         HAS_CPU_FEATURE (SSE4_2)
  63         jz      2f
  64         HAS_ARCH_FEATURE (Slow_SSE4_2)
  65         jnz     2f
  66         LOAD_FUNC_GOT_EAX (__STRCMP_SSE4_2)
  67 2:      ret
  68 END(STRCMP)
  69
  70 # undef ENTRY
  71 # define ENTRY(name) \
  72         .type __STRCMP_IA32, @function; \
  73         .p2align 4; \
  74         .globl __STRCMP_IA32; \
  75         .hidden __STRCMP_IA32; \
  76         __STRCMP_IA32: cfi_startproc; \
  77         CALL_MCOUNT
  78 # undef END
  79 # define END(name) \
  80         cfi_endproc; .size __STRCMP_IA32, .-__STRCMP_IA32
  81
  82 # ifdef SHARED
  83 #  undef libc_hidden_builtin_def
  84 /* IFUNC doesn't work with the hidden functions in shared library since
  85    they will be called without setting up EBX needed for PLT which is
  86    used by IFUNC.  */
  87 #  define libc_hidden_builtin_def(name) \
  88         .globl __GI_STRCMP; __GI_STRCMP = __STRCMP_IA32
  89 # endif
  90 #endif
  91
  92 #if !defined USE_AS_STRNCMP && !defined USE_AS_STRCASECMP_L \
  93     && !defined USE_AS_STRNCASECMP_L
  94 # include "../strcmp.S"
  95 #endif