diff options
Diffstat (limited to 'sysdeps/i386/multiarch/memcpy.c')
| -rw-r--r-- | sysdeps/i386/multiarch/memcpy.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/sysdeps/i386/multiarch/memcpy.c b/sysdeps/i386/multiarch/memcpy.c new file mode 100644 index 0000000000..68401c754a --- /dev/null +++ b/sysdeps/i386/multiarch/memcpy.c @@ -0,0 +1,69 @@ +/* Multiple versions of memcpy. + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2015 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/>. */ + +/* 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 && IS_IN (libc) +/* Redefine memcpy so that the compiler won't complain about the type + mismatch with the IFUNC selector in strong_alias, below. */ +# undef memcpy +# define memcpy __redirect_memcpy +# include <string.h> +# undef memcpy + +# include <init-arch.h> + +extern __typeof (__redirect_memcpy) __memcpy_i386 attribute_hidden; +extern __typeof (__redirect_memcpy) __memcpy_i586 attribute_hidden; +extern __typeof (__redirect_memcpy) __memcpy_i686 attribute_hidden; +extern __typeof (__redirect_memcpy) __memcpy_sse2_unaligned attribute_hidden; +extern __typeof (__redirect_memcpy) __memcpy_ssse3 attribute_hidden; +extern __typeof (__redirect_memcpy) __memcpy_ssse3_rep attribute_hidden; + +/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle + ifunc symbol properly. */ +extern __typeof (__redirect_memcpy) memcpy; +extern void *memcpy_ifunc (void) __asm__ ("memcpy"); + +void * +memcpy_ifunc (void) +{ + if (HAS_CPU_FEATURE (SSE2)) + { + if (HAS_ARCH_FEATURE (Fast_Unaligned_Load)) + return __memcpy_sse2_unaligned; + else if (HAS_CPU_FEATURE (SSSE3)) + { + if (HAS_ARCH_FEATURE (Fast_Rep_String)) + return __memcpy_ssse3_rep; + else + return __memcpy_ssse3; + } + } + + if (USE_I686) + return __memcpy_i686; + else if (USE_I586) + return __memcpy_i586; + else + return __memcpy_i386; +} +__asm__ (".type memcpy, %gnu_indirect_function"); +#endif |