projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 3ab2d57a | 1 | /* strlen(str) -- determine the length of the string STR. |
| 623aac7f | 2 | Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
| 3ab2d57a UD |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>. |
| 4 | This file is part of the GNU C Library. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 17 | License along with the GNU C Library; if not, write to the Free | |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 19 | 02111-1307 USA. */ | |
| 20 | ||
| 21 | #include <sysdep.h> | |
| 51ddd2c0 | 22 | #include <init-arch.h> |
| 3ab2d57a UD |
23 | |
| 24 | ||
| 25 | /* Define multiple versions only for the definition in libc and for | |
| 26 | the DSO. In static binaries we need strlen before the initialization | |
| 27 | happened. */ | |
| 28 | #if defined SHARED && !defined NOT_IN_libc | |
| 29 | .text | |
| 30 | ENTRY(strlen) | |
| 31 | .type strlen, @gnu_indirect_function | |
| 32 | cmpl $0, __cpu_features+KIND_OFFSET(%rip) | |
| 33 | jne 1f | |
| 34 | call __init_cpu_features | |
| 35 | 1: leaq __strlen_sse2(%rip), %rax | |
| 51ddd2c0 | 36 | testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip) |
| 3ab2d57a UD |
37 | jz 2f |
| 38 | leaq __strlen_sse42(%rip), %rax | |
| 5a7af22f | 39 | ret |
| 623aac7f L |
40 | 2: testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip) |
| 41 | jz 3f | |
| 42 | leaq __strlen_no_bsf(%rip), %rax | |
| 43 | 3: ret | |
| 44 | END(strlen) | |
| 3ab2d57a UD |
45 | |
| 46 | # undef ENTRY | |
| 47 | # define ENTRY(name) \ | |
| 6f9eea15 | 48 | .type __strlen_sse2, @function; \ |
| d6485c98 | 49 | .align 16; \ |
| 6f9eea15 UD |
50 | __strlen_sse2: cfi_startproc; \ |
| 51 | CALL_MCOUNT | |
| 3ab2d57a UD |
52 | # undef END |
| 53 | # define END(name) \ | |
| 6f9eea15 | 54 | cfi_endproc; .size __strlen_sse2, .-__strlen_sse2 |
| 3ab2d57a UD |
55 | # undef libc_hidden_builtin_def |
| 56 | /* It doesn't make sense to send libc-internal strlen calls through a PLT. | |
| 57 | The speedup we get from using SSE4.2 instruction is likely eaten away | |
| 58 | by the indirect call in the PLT. */ | |
| 59 | # define libc_hidden_builtin_def(name) \ | |
| 60 | .globl __GI_strlen; __GI_strlen = __strlen_sse2 | |
| 61 | #endif | |
| 62 | ||
| 63 | #include "../strlen.S" |