From 83d1cc42d8e6b18a4b6ba53addfdae98c694ea36 Mon Sep 17 00:00:00 2001 From: Feng Xue Date: Thu, 9 Aug 2018 04:38:03 -0400 Subject: aarch64: Optimized memchr specific to AmpereComputing emag This version uses general register based memory instruction to load data, because vector register based is slightly slower in emag. Character-matching is performed on 16-byte (both size and alignment) memory block in parallel each iteration. * sysdeps/aarch64/memchr.S (__memchr): Rename to MEMCHR. [!MEMCHR](MEMCHR): Set to __memchr. * sysdeps/aarch64/multiarch/Makefile (sysdep_routines): Add memchr_generic and memchr_nosimd. * sysdeps/aarch64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add memchr ifuncs. * sysdeps/aarch64/multiarch/memchr.c: New file. * sysdeps/aarch64/multiarch/memchr_generic.S: Likewise. * sysdeps/aarch64/multiarch/memchr_nosimd.S: Likewise. --- sysdeps/aarch64/multiarch/memchr.c | 41 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 sysdeps/aarch64/multiarch/memchr.c (limited to 'sysdeps/aarch64/multiarch/memchr.c') diff --git a/sysdeps/aarch64/multiarch/memchr.c b/sysdeps/aarch64/multiarch/memchr.c new file mode 100644 index 0000000000..3a2f1d1c73 --- /dev/null +++ b/sysdeps/aarch64/multiarch/memchr.c @@ -0,0 +1,41 @@ +/* Multiple versions of memchr. AARCH64 version. + Copyright (C) 2018 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 + . */ + +/* Define multiple versions only for the definition in libc. */ + +#if IS_IN (libc) +/* Redefine memchr so that the compiler won't complain about the type + mismatch with the IFUNC selector in strong_alias, below. */ +# undef memchr +# define memchr __redirect_memchr +# include +# include + +extern __typeof (__redirect_memchr) __memchr; + +extern __typeof (__redirect_memchr) __memchr_generic attribute_hidden; +extern __typeof (__redirect_memchr) __memchr_nosimd attribute_hidden; + +libc_ifunc (__memchr, + ((IS_EMAG (midr) + ? __memchr_nosimd + : __memchr_generic))); + +# undef memchr +strong_alias (__memchr, memchr); +#endif -- cgit 1.4.1