sysdeps/i386/i686/multiarch/memchr.S

   1 /* Multiple versions of memchr
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2011-2016 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 #if IS_IN (libc)
  25         .text
  26 ENTRY(__memchr)
  27         .type   __memchr, @gnu_indirect_function
  28         LOAD_GOT_AND_RTLD_GLOBAL_RO
  29         HAS_CPU_FEATURE (SSE2)
  30         jz      2f
  31         HAS_ARCH_FEATURE (Slow_BSF)
  32         jz      3f
  33
  34         LOAD_FUNC_GOT_EAX ( __memchr_sse2)
  35         ret
  36
  37 2:      LOAD_FUNC_GOT_EAX (__memchr_ia32)
  38         ret
  39
  40 3:      LOAD_FUNC_GOT_EAX (__memchr_sse2_bsf)
  41         ret
  42 END(__memchr)
  43
  44 weak_alias(__memchr, memchr)
  45
  46 # undef ENTRY
  47 # define ENTRY(name) \
  48         .type __memchr_ia32, @function; \
  49         .globl __memchr_ia32; \
  50         .p2align 4; \
  51         __memchr_ia32: cfi_startproc; \
  52         CALL_MCOUNT
  53 # undef END
  54 # define END(name) \
  55         cfi_endproc; .size __memchr_ia32, .-__memchr_ia32
  56
  57 # undef libc_hidden_builtin_def
  58 /* IFUNC doesn't work with the hidden functions in shared library since
  59    they will be called without setting up EBX needed for PLT which is
  60    used by IFUNC.  */
  61 # define libc_hidden_builtin_def(name) \
  62         .globl __GI_memchr; __GI_memchr = __memchr_ia32
  63
  64 #endif
  65 #include "../../memchr.S"