diff options
Diffstat (limited to 'sysdeps/i386/i686/multiarch/memcmp.S')
| -rw-r--r-- | sysdeps/i386/i686/multiarch/memcmp.S | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/multiarch/memcmp.S b/sysdeps/i386/i686/multiarch/memcmp.S new file mode 100644 index 0000000000..cf606a5959 --- /dev/null +++ b/sysdeps/i386/i686/multiarch/memcmp.S @@ -0,0 +1,88 @@ +/* Multiple versions of memcmp + Copyright (C) 2010 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> + +/* Define multiple versions only for the definition in libc. */ +#ifndef NOT_IN_libc +# ifdef SHARED + .text +ENTRY(memcmp) + .type memcmp, @gnu_indirect_function + pushl %ebx + cfi_adjust_cfa_offset (4) + cfi_rel_offset (ebx, 0) + 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: leal __memcmp_ia32@GOTOFF(%ebx), %eax + testl $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features@GOTOFF(%ebx) + jz 2f + leal __memcmp_ssse3@GOTOFF(%ebx), %eax + testl $bit_SSE4_2, CPUID_OFFSET+index_SSE4_2+__cpu_features@GOTOFF(%ebx) + jz 2f + leal __memcmp_sse4_2@GOTOFF(%ebx), %eax +2: popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (ebx) + ret +END(memcmp) +# else + .text +ENTRY(memcmp) + .type memcmp, @gnu_indirect_function + cmpl $0, KIND_OFFSET+__cpu_features + jne 1f + call __init_cpu_features +1: leal __memcmp_ia32, %eax + testl $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features + jz 2f + leal __memcmp_ssse3, %eax + testl $bit_SSE4_2, CPUID_OFFSET+index_SSE4_2+__cpu_features + jz 2f + leal __memcmp_sse4_2, %eax +2: ret +END(memcmp) +# endif + +# undef ENTRY +# define ENTRY(name) \ + .type __memcmp_ia32, @function; \ + .p2align 4; \ + __memcmp_ia32: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size __memcmp_ia32, .-__memcmp_ia32 + +# ifdef SHARED +# 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_memcmp; __GI_memcmp = __memcmp_ia32 +# endif +#endif + +#include "../memcmp.S" |