diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/multiarch/memset.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/multiarch/memset.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/multiarch/memset.S b/REORG.TODO/sysdeps/x86_64/multiarch/memset.S new file mode 100644 index 0000000000..11f27378b0 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/multiarch/memset.S @@ -0,0 +1,82 @@ +/* Multiple versions of memset + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2014-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <shlib-compat.h> +#include <init-arch.h> + +/* Define multiple versions only for the definition in lib. */ +#if IS_IN (libc) +ENTRY(memset) + .type memset, @gnu_indirect_function + LOAD_RTLD_GLOBAL_RO_RDX + lea __memset_erms(%rip), %RAX_LP + HAS_ARCH_FEATURE (Prefer_ERMS) + jnz 2f + lea __memset_sse2_unaligned_erms(%rip), %RAX_LP + HAS_CPU_FEATURE (ERMS) + jnz 1f + lea __memset_sse2_unaligned(%rip), %RAX_LP +1: + HAS_ARCH_FEATURE (AVX2_Usable) + jz 2f + lea __memset_avx2_unaligned_erms(%rip), %RAX_LP + HAS_CPU_FEATURE (ERMS) + jnz L(AVX512F) + lea __memset_avx2_unaligned(%rip), %RAX_LP +L(AVX512F): + HAS_ARCH_FEATURE (Prefer_No_AVX512) + jnz 2f + HAS_ARCH_FEATURE (AVX512F_Usable) + jz 2f + lea __memset_avx512_no_vzeroupper(%rip), %RAX_LP + HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER) + jnz 2f + lea __memset_avx512_unaligned_erms(%rip), %RAX_LP + HAS_CPU_FEATURE (ERMS) + jnz 2f + lea __memset_avx512_unaligned(%rip), %RAX_LP +2: ret +END(memset) +#endif + +#if IS_IN (libc) +# define MEMSET_SYMBOL(p,s) p##_sse2_##s +# define WMEMSET_SYMBOL(p,s) p##_sse2_##s + +# 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 SSE2 instructions is likely eaten away + by the indirect call in the PLT. */ +# define libc_hidden_builtin_def(name) \ + .globl __GI_memset; __GI_memset = __memset_sse2_unaligned; \ + .globl __GI_wmemset; __GI_wmemset = __wmemset_sse2_unaligned; \ + .globl __GI___wmemset; __GI___wmemset = __wmemset_sse2_unaligned +# endif + +# undef weak_alias +# define weak_alias(original, alias) \ + .weak bzero; bzero = __bzero + +# undef strong_alias +# define strong_alias(original, alias) +#endif + +#include "../memset.S" |