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| author | Ondrej Bilka <neleai@seznam.cz> | 2013-03-18 07:39:12 +0100 |
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| committer | Ondrej Bilka <neleai@seznam.cz> | 2013-03-18 07:39:12 +0100 |
| commit | 37bb363f03d75e5e6f2ca45f2c686a3a0167797e (patch) | |
| tree | a50f6871e18f34cab50d770bcc730c53364850d5 /sysdeps/x86_64/multiarch/strlen.S | |
| parent | f816705060415c476d8a9a0cbb683dc7a5aeef8e (diff) | |
| download | glibc-37bb363f03d75e5e6f2ca45f2c686a3a0167797e.tar.gz glibc-37bb363f03d75e5e6f2ca45f2c686a3a0167797e.tar.xz glibc-37bb363f03d75e5e6f2ca45f2c686a3a0167797e.zip | |
Faster strlen on x64.
Diffstat (limited to 'sysdeps/x86_64/multiarch/strlen.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/strlen.S | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/sysdeps/x86_64/multiarch/strlen.S b/sysdeps/x86_64/multiarch/strlen.S deleted file mode 100644 index ab29ceff21..0000000000 --- a/sysdeps/x86_64/multiarch/strlen.S +++ /dev/null @@ -1,68 +0,0 @@ -/* Multiple versions of strlen(str) -- determine the length of the string STR. - All versions must be listed in ifunc-impl-list.c. - Copyright (C) 2009-2013 Free Software Foundation, Inc. - Contributed by Ulrich Drepper <drepper@redhat.com>. - 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 libc and for - the DSO. In static binaries we need strlen before the initialization - happened. */ -#if defined SHARED && !defined NOT_IN_libc - .text -ENTRY(strlen) - .type strlen, @gnu_indirect_function - cmpl $0, __cpu_features+KIND_OFFSET(%rip) - jne 1f - call __init_cpu_features -1: leaq __strlen_sse2_pminub(%rip), %rax - testl $bit_Prefer_PMINUB_for_stringop, __cpu_features+FEATURE_OFFSET+index_Prefer_PMINUB_for_stringop(%rip) - jnz 2f - leaq __strlen_sse2(%rip), %rax - testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) - jz 2f - leaq __strlen_sse42(%rip), %rax - ret -2: testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip) - jz 3f - leaq __strlen_sse2_no_bsf(%rip), %rax -3: ret -END(strlen) - -# undef ENTRY -# define ENTRY(name) \ - .type __strlen_sse2, @function; \ - .align 16; \ - .globl __strlen_sse2; \ - .hidden __strlen_sse2; \ - __strlen_sse2: cfi_startproc; \ - CALL_MCOUNT -# undef END -# define END(name) \ - cfi_endproc; .size __strlen_sse2, .-__strlen_sse2 -# undef libc_hidden_builtin_def -/* It doesn't make sense to send libc-internal strlen calls through a PLT. - The speedup we get from using SSE4.2 instruction is likely eaten away - by the indirect call in the PLT. */ -# define libc_hidden_builtin_def(name) \ - .globl __GI_strlen; __GI_strlen = __strlen_sse2 -#endif - -#include "../strlen.S" |