sysdeps/x86_64/multiarch/strcspn.S

   1 /* Multiple versions of strcspn
   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 <init-arch.h>
  27
  28 #ifdef USE_AS_STRPBRK
  29 #define STRCSPN_SSE42   __strpbrk_sse42
  30 #define STRCSPN_SSE2    __strpbrk_sse2
  31 #define __GI_STRCSPN    __GI_strpbrk
  32 #else
  33 #ifndef STRCSPN
  34 #define STRCSPN         strcspn
  35 #define STRCSPN_SSE42   __strcspn_sse42
  36 #define STRCSPN_SSE2    __strcspn_sse2
  37 #define __GI_STRCSPN    __GI_strcspn
  38 #endif
  39 #endif
  40
  41 /* Define multiple versions only for the definition in libc.  Don't
  42    define multiple versions for strpbrk in static library since we
  43    need strpbrk before the initialization happened.  */
  44 #if (defined SHARED || !defined USE_AS_STRPBRK) && !defined NOT_IN_libc
  45         .text
  46 ENTRY(STRCSPN)
  47         .type   STRCSPN, @gnu_indirect_function
  48         cmpl    $0, __cpu_features+KIND_OFFSET(%rip)
  49         jne     1f
  50         call    __init_cpu_features
  51 1:      leaq    STRCSPN_SSE2(%rip), %rax
  52         testl   $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
  53         jz      2f
  54         leaq    STRCSPN_SSE42(%rip), %rax
  55 2:      ret
  56 END(STRCSPN)
  57
  58 # undef ENTRY
  59 # define ENTRY(name) \
  60         .type STRCSPN_SSE2, @function; \
  61         .globl STRCSPN_SSE2; \
  62         .align 16; \
  63         STRCSPN_SSE2: cfi_startproc; \
  64         CALL_MCOUNT
  65 # undef END
  66 # define END(name) \
  67         cfi_endproc; .size STRCSPN_SSE2, .-STRCSPN_SSE2
  68 # undef libc_hidden_builtin_def
  69 /* It doesn't make sense to send libc-internal strcspn calls through a PLT.
  70    The speedup we get from using SSE4.2 instruction is likely eaten away
  71    by the indirect call in the PLT.  */
  72 # define libc_hidden_builtin_def(name) \
  73         .globl __GI_STRCSPN; __GI_STRCSPN = STRCSPN_SSE2
  74 #endif
  75
  76 #endif /* HAVE_SSE4_SUPPORT */
  77
  78 #ifdef USE_AS_STRPBRK
  79 #include "../strpbrk.S"
  80 #else
  81 #include "../strcspn.S"
  82 #endif