diff options
Diffstat (limited to 'sysdeps/i386/i686/multiarch/memchr.S')
| -rw-r--r-- | sysdeps/i386/i686/multiarch/memchr.S | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/multiarch/memchr.S b/sysdeps/i386/i686/multiarch/memchr.S new file mode 100644 index 0000000000..163a83e17b --- /dev/null +++ b/sysdeps/i386/i686/multiarch/memchr.S @@ -0,0 +1,99 @@ +/* Multiple versions of memchr + Copyright (C) 2011 Free Software Foundation, Inc. + Contributed by Intel Corporation. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <init-arch.h> + +#ifndef NOT_IN_libc + .section .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits + .globl __i686.get_pc_thunk.bx + .hidden __i686.get_pc_thunk.bx + .p2align 4 + .type __i686.get_pc_thunk.bx,@function +__i686.get_pc_thunk.bx: + movl (%esp), %ebx + ret + +# define CFI_POP(REG) \ + cfi_adjust_cfa_offset (-4); \ + cfi_restore (REG) + +# define CFI_PUSH(REG) \ + cfi_adjust_cfa_offset (4); \ + cfi_rel_offset (REG, 0) + + .text +ENTRY(__memchr) + .type __memchr, @gnu_indirect_function + pushl %ebx + CFI_PUSH (%ebx) + call __i686.get_pc_thunk.bx + addl $_GLOBAL_OFFSET_TABLE_, %ebx + cmpl $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx) + jne 1f + call __init_cpu_features + +1: testl $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx) + jz 2f + testl $bit_Slow_BSF, FEATURE_OFFSET+index_Slow_BSF+__cpu_features@GOTOFF(%ebx) + jz 3f + + leal __memchr_sse2@GOTOFF(%ebx), %eax + popl %ebx + CFI_POP (%ebx) + ret + + CFI_PUSH (%ebx) + +2: leal __memchr_ia32@GOTOFF(%ebx), %eax + popl %ebx + CFI_POP (%ebx) + ret + + CFI_PUSH (%ebx) + +3: leal __memchr_sse2_bsf@GOTOFF(%ebx), %eax + popl %ebx + CFI_POP (%ebx) + ret +END(__memchr) + +weak_alias(__memchr, memchr) + +# undef ENTRY +# define ENTRY(name) \ + .type __memchr_ia32, @function; \ + .globl __memchr_ia32; \ + .p2align 4; \ + __memchr_ia32: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size __memchr_ia32, .-__memchr_ia32 + +# undef libc_hidden_builtin_def +/* IFUNC doesn't work with the hidden functions in shared library since + they will be called without setting up EBX needed for PLT which is + used by IFUNC. */ +# define libc_hidden_builtin_def(name) \ + .globl __GI_memchr; __GI_memchr = __memchr_ia32 + +#endif +#include "../../memchr.S" |