diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/multiarch/strchr.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/multiarch/strchr.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/multiarch/strchr.S b/REORG.TODO/sysdeps/x86_64/multiarch/strchr.S new file mode 100644 index 0000000000..c9f54ca2e2 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/multiarch/strchr.S @@ -0,0 +1,57 @@ +/* Multiple versions of strchr + Copyright (C) 2009-2017 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 libc. */ +#if IS_IN (libc) + .text +ENTRY(strchr) + .type strchr, @gnu_indirect_function + LOAD_RTLD_GLOBAL_RO_RDX + leaq __strchr_sse2(%rip), %rax +2: HAS_ARCH_FEATURE (Slow_BSF) + jz 3f + leaq __strchr_sse2_no_bsf(%rip), %rax +3: ret +END(strchr) + + + +# undef ENTRY +# define ENTRY(name) \ + .type __strchr_sse2, @function; \ + .align 16; \ + .globl __strchr_sse2; \ + .hidden __strchr_sse2; \ + __strchr_sse2: cfi_startproc; \ + CALL_MCOUNT +# undef END +# define END(name) \ + cfi_endproc; .size __strchr_sse2, .-__strchr_sse2 +# undef libc_hidden_builtin_def +/* It doesn't make sense to send libc-internal strchr 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_strchr; __GI_strchr = __strchr_sse2 +#endif + +#include "../strchr.S" |