diff options
| author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
| commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
| tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/x86_64/multiarch/memset.S | |
| parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
| download | glibc-zack/build-layout-experiment.tar.gz | |
Prepare for radical source tree reorganization.zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).
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" |