diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/memcpy.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memcpy.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/memcpy.S b/sysdeps/x86_64/multiarch/memcpy.S new file mode 100644 index 0000000000..8e9fb190d3 --- /dev/null +++ b/sysdeps/x86_64/multiarch/memcpy.S @@ -0,0 +1,73 @@ +/* Multiple versions of memcpy + 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 lib and for + DSO. In static binaries we need memcpy before the initialization + happened. */ +#if defined SHARED && !defined NOT_IN_libc + .text +ENTRY(memcpy) + .type memcpy, @gnu_indirect_function + cmpl $0, KIND_OFFSET+__cpu_features(%rip) + jne 1f + call __init_cpu_features +1: leaq __memcpy_sse2(%rip), %rax + testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip) + jz 2f + leaq __memcpy_ssse3(%rip), %rax + testl $bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip) + jz 2f + leaq __memcpy_ssse3_back(%rip), %rax +2: ret +END(memcpy) + +# undef ENTRY +# define ENTRY(name) \ + .type __memcpy_sse2, @function; \ + .p2align 4; \ + __memcpy_sse2: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size __memcpy_sse2, .-__memcpy_sse2 + +# undef ENTRY_CHK +# define ENTRY_CHK(name) \ + .type __memcpy_chk_sse2, @function; \ + .globl __memcpy_chk_sse2; \ + .p2align 4; \ + __memcpy_chk_sse2: cfi_startproc; \ + CALL_MCOUNT +# undef END_CHK +# define END_CHK(name) \ + cfi_endproc; .size __memcpy_chk_sse2, .-__memcpy_chk_sse2 + +# undef libc_hidden_builtin_def +/* It doesn't make sense to send libc-internal memcpy calls through a PLT. + The speedup we get from using SSSE3 instruction is likely eaten away + by the indirect call in the PLT. */ +# define libc_hidden_builtin_def(name) \ + .globl __GI_memcpy; __GI_memcpy = __memcpy_sse2 +#endif + +#include "../memcpy.S" |