sysdeps/x86_64/multiarch/strspn.S

   1 /* Multiple versions of strspn
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2009-2015 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 <config.h>
  22
  23 #ifdef HAVE_SSE4_SUPPORT
  24
  25 #include <sysdep.h>
  26 #include <init-arch.h>
  27
  28 /* Define multiple versions only for the definition in libc.  */
  29 #if IS_IN (libc)
  30         .text
  31 ENTRY(strspn)
  32         .type   strspn, @gnu_indirect_function
  33         cmpl    $0, __cpu_features+KIND_OFFSET(%rip)
  34         jne     1f
  35         call    __init_cpu_features
  36 1:      leaq    __strspn_sse2(%rip), %rax
  37         testl   $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
  38         jz      2f
  39         leaq    __strspn_sse42(%rip), %rax
  40 2:      ret
  41 END(strspn)
  42
  43 # undef ENTRY
  44 # define ENTRY(name) \
  45         .type __strspn_sse2, @function; \
  46         .globl __strspn_sse2; \
  47         .align 16; \
  48         __strspn_sse2: cfi_startproc; \
  49         CALL_MCOUNT
  50 # undef END
  51 # define END(name) \
  52         cfi_endproc; .size __strspn_sse2, .-__strspn_sse2
  53 # undef libc_hidden_builtin_def
  54 /* It doesn't make sense to send libc-internal strspn calls through a PLT.
  55    The speedup we get from using SSE4.2 instruction is likely eaten away
  56    by the indirect call in the PLT.  */
  57 # define libc_hidden_builtin_def(name) \
  58         .globl __GI_strspn; __GI_strspn = __strspn_sse2
  59 #endif
  60
  61 #endif /* HAVE_SSE4_SUPPORT */
  62
  63 #include "../strspn.S"