diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/memset.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memset.S | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/memset.S b/sysdeps/x86_64/multiarch/memset.S new file mode 100644 index 0000000000..a8d0e9ea22 --- /dev/null +++ b/sysdeps/x86_64/multiarch/memset.S @@ -0,0 +1,74 @@ +/* Multiple versions of memset + Copyright (C) 2010 Free Software Foundation, Inc. + 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. */ +#ifndef NOT_IN_libc +ENTRY(memset) + .type memset, @gnu_indirect_function + cmpl $0, __cpu_features+KIND_OFFSET(%rip) + jne 1f + call __init_cpu_features +1: leaq __memset_x86_64(%rip), %rax + testl $bit_Prefer_SSE_for_memop, __cpu_features+FEATURE_OFFSET+index_Prefer_SSE_for_memop(%rip) + jz 2f + leaq __memset_sse2(%rip), %rax +2: ret +END(memset) + +# define USE_SSE2 1 + +# undef ENTRY +# define ENTRY(name) \ + .type __memset_sse2, @function; \ + .globl __memset_sse2; \ + .p2align 4; \ + __memset_sse2: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size __memset_sse2, .-__memset_sse2 + +# undef ENTRY_CHK +# define ENTRY_CHK(name) \ + .type __memset_chk_sse2, @function; \ + .globl __memset_chk_sse2; \ + .p2align 4; \ + __memset_chk_sse2: cfi_startproc; \ + CALL_MCOUNT +# undef END_CHK +# define END_CHK(name) \ + cfi_endproc; .size __memset_chk_sse2, .-__memset_chk_sse2 + +# ifdef SHARED +# undef libc_hidden_builtin_def +/* It doesn't make sense to send libc-internal memset calls through a PLT. + The speedup we get from using GPR instruction is likely eaten away + by the indirect call in the PLT. */ +# define libc_hidden_builtin_def(name) \ + .globl __GI_memset; __GI_memset = __memset_sse2 +# endif + +# undef strong_alias +# define strong_alias(original, alias) +#endif + +#include "../memset.S" |