diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/strncpy.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/strncpy.S | 88 |
1 files changed, 84 insertions, 4 deletions
diff --git a/sysdeps/x86_64/multiarch/strncpy.S b/sysdeps/x86_64/multiarch/strncpy.S index 6d87a0ba35..afbd87096c 100644 --- a/sysdeps/x86_64/multiarch/strncpy.S +++ b/sysdeps/x86_64/multiarch/strncpy.S @@ -1,5 +1,85 @@ -/* Multiple versions of strncpy - All versions must be listed in ifunc-impl-list.c. */ -#define STRCPY strncpy +/* Multiple versions of strcpy + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2009-2015 Free Software Foundation, Inc. + Contributed by Intel Corporation. + 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 USE_AS_STRNCPY -#include "strcpy.S" +#ifndef STRNCPY +#define STRNCPY strncpy +#endif + +#ifdef USE_AS_STPCPY +# define STRNCPY_SSSE3 __stpncpy_ssse3 +# define STRNCPY_SSE2 __stpncpy_sse2 +# define STRNCPY_SSE2_UNALIGNED __stpncpy_sse2_unaligned +# define __GI_STRNCPY __GI_stpncpy +# define __GI___STRNCPY __GI___stpncpy +#else +# define STRNCPY_SSSE3 __strncpy_ssse3 +# define STRNCPY_SSE2 __strncpy_sse2 +# define STRNCPY_SSE2_UNALIGNED __strncpy_sse2_unaligned +# define __GI_STRNCPY __GI_strncpy +#endif + + +/* Define multiple versions only for the definition in libc. */ +#if IS_IN (libc) + .text +ENTRY(STRNCPY) + .type STRNCPY, @gnu_indirect_function + cmpl $0, __cpu_features+KIND_OFFSET(%rip) + jne 1f + call __init_cpu_features +1: leaq STRNCPY_SSE2_UNALIGNED(%rip), %rax + testl $bit_Fast_Unaligned_Load, __cpu_features+FEATURE_OFFSET+index_Fast_Unaligned_Load(%rip) + jnz 2f + leaq STRNCPY_SSE2(%rip), %rax + testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip) + jz 2f + leaq STRNCPY_SSSE3(%rip), %rax +2: ret +END(STRNCPY) + +# undef ENTRY +# define ENTRY(name) \ + .type STRNCPY_SSE2, @function; \ + .align 16; \ + .globl STRNCPY_SSE2; \ + .hidden STRNCPY_SSE2; \ + STRNCPY_SSE2: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size STRNCPY_SSE2, .-STRNCPY_SSE2 +# undef libc_hidden_builtin_def +/* It doesn't make sense to send libc-internal strcpy calls through a PLT. + The speedup we get from using SSSE3 instruction is likely eaten away + by the indirect call in the PLT. */ +# define libc_hidden_builtin_def(name) \ + .globl __GI_STRNCPY; __GI_STRNCPY = STRNCPY_SSE2 +# undef libc_hidden_def +# define libc_hidden_def(name) \ + .globl __GI___STRNCPY; __GI___STRNCPY = STRNCPY_SSE2 +#endif + +#ifndef USE_AS_STRNCPY +#include "../strcpy.S" +#endif |