diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/memmove.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/memmove.S b/sysdeps/x86_64/multiarch/memmove.S new file mode 100644 index 0000000000..25c3586ee9 --- /dev/null +++ b/sysdeps/x86_64/multiarch/memmove.S @@ -0,0 +1,98 @@ +/* Multiple versions of memmove + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2016 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 <init-arch.h> + +/* Define multiple versions only for the definition in lib and for + DSO. */ +#if IS_IN (libc) + .text +ENTRY(__libc_memmove) + .type __libc_memmove, @gnu_indirect_function + LOAD_RTLD_GLOBAL_RO_RDX +# ifdef HAVE_AVX512_ASM_SUPPORT + HAS_ARCH_FEATURE (AVX512F_Usable) + jz 1f + lea __memmove_avx512_no_vzeroupper(%rip), %RAX_LP + HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER) + jnz 2f + lea __memmove_avx512_unaligned_erms(%rip), %RAX_LP + HAS_CPU_FEATURE (ERMS) + jnz 2f + lea __memmove_avx512_unaligned(%rip), %RAX_LP + ret +# endif +1: lea __memmove_avx_unaligned(%rip), %RAX_LP + HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) + jz L(Fast_Unaligned_Load) + HAS_CPU_FEATURE (ERMS) + jz 2f + lea __memmove_avx_unaligned_erms(%rip), %RAX_LP + ret +L(Fast_Unaligned_Load): + lea __memmove_sse2_unaligned(%rip), %RAX_LP + HAS_ARCH_FEATURE (Fast_Unaligned_Copy) + jz L(SSSE3) + HAS_CPU_FEATURE (ERMS) + jz 2f + lea __memmove_sse2_unaligned_erms(%rip), %RAX_LP + ret +L(SSSE3): + HAS_CPU_FEATURE (SSSE3) + jz 2f + lea __memmove_ssse3_back(%rip), %RAX_LP + HAS_ARCH_FEATURE (Fast_Copy_Backward) + jnz 2f + lea __memmove_ssse3(%rip), %RAX_LP +2: ret +END(__libc_memmove) +#endif + +#if IS_IN (libc) +# define MEMMOVE_SYMBOL(p,s) p##_sse2_##s + +# ifdef SHARED +libc_hidden_ver (__memmove_sse2_unaligned, memmove) +libc_hidden_ver (__memcpy_sse2_unaligned, memcpy) +libc_hidden_ver (__mempcpy_sse2_unaligned, mempcpy) +libc_hidden_ver (__mempcpy_sse2_unaligned, __mempcpy) + +# undef libc_hidden_builtin_def +/* It doesn't make sense to send libc-internal memmove 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 +# endif +strong_alias (__libc_memmove, memmove) +#endif + +#if !defined SHARED || !IS_IN (libc) +weak_alias (__mempcpy, mempcpy) +#endif + +#include "../memmove.S" + +#if defined SHARED && IS_IN (libc) +# include <shlib-compat.h> +# if SHLIB_COMPAT (libc, GLIBC_2_2_5, GLIBC_2_14) +/* Use __memmove_sse2_unaligned to support overlapping addresses. */ +compat_symbol (libc, __memmove_sse2_unaligned, memcpy, GLIBC_2_2_5); +# endif +#endif |