sysdeps/i386/i686/multiarch/strspn.S

   1 /* Multiple versions of strspn
   2    Copyright (C) 2009 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <config.h>
  22
  23 #ifdef HAVE_SSE4_SUPPORT
  24
  25 #include <sysdep.h>
  26 #include <ifunc-defines.h>
  27
  28 /* Define multiple versions only for the definition in libc.  */
  29 #ifndef NOT_IN_libc
  30         .section        .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits
  31         .globl  __i686.get_pc_thunk.bx
  32         .hidden __i686.get_pc_thunk.bx
  33         .p2align 4
  34         .type   __i686.get_pc_thunk.bx,@function
  35 __i686.get_pc_thunk.bx:
  36         movl    (%esp), %ebx
  37         ret
  38
  39         .text
  40 ENTRY(strspn)
  41         .type   strspn, @gnu_indirect_function
  42         pushl   %ebx
  43         cfi_adjust_cfa_offset (4)
  44         cfi_rel_offset (ebx, 0)
  45         call    __i686.get_pc_thunk.bx
  46         addl    $_GLOBAL_OFFSET_TABLE_, %ebx
  47         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  48         jne     1f
  49         call    __init_cpu_features
  50 1:      leal    __strspn_ia32@GOTOFF(%ebx), %eax
  51         testl   $(1<<20), CPUID_OFFSET+COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET+__cpu_features@GOTOFF(%ebx)
  52         jz      2f
  53         leal    __strspn_sse42@GOTOFF(%ebx), %eax
  54 2:      popl    %ebx
  55         cfi_adjust_cfa_offset (-4);
  56         cfi_restore (ebx)
  57         ret
  58 END(strspn)
  59
  60 # undef ENTRY
  61 # define ENTRY(name) \
  62         .type __strspn_ia32, @function; \
  63         .globl __strspn_ia32; \
  64         .p2align 4
  65         __strspn_ia32: cfi_startproc; \
  66         CALL_MCOUNT
  67 # undef END
  68 # define END(name) \
  69         cfi_endproc; .size __strspn_ia32, .-__strspn_ia32
  70 # undef libc_hidden_builtin_def
  71 /* It doesn't make sense to send libc-internal strspn calls through a PLT.
  72    The speedup we get from using SSE4.2 instruction is likely eaten away
  73    by the indirect call in the PLT.  */
  74 # define libc_hidden_builtin_def(name) \
  75         .globl __GI_strspn; __GI_strspn = __strspn_ia32
  76 #endif
  77
  78 #endif /* HAVE_SSE4_SUPPORT */
  79
  80 #include "../../strspn.S"