From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/tile/lib/strlen_64.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 arch/tile/lib/strlen_64.c (limited to 'arch/tile/lib/strlen_64.c') diff --git a/arch/tile/lib/strlen_64.c b/arch/tile/lib/strlen_64.c new file mode 100644 index 00000000..9583fc33 --- /dev/null +++ b/arch/tile/lib/strlen_64.c @@ -0,0 +1,35 @@ +/* + * Copyright 2011 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program 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, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include "string-endian.h" + +size_t strlen(const char *s) +{ + /* Get an aligned pointer. */ + const uintptr_t s_int = (uintptr_t) s; + const uint64_t *p = (const uint64_t *)(s_int & -8); + + /* Read and MASK the first word. */ + uint64_t v = *p | MASK(s_int); + + uint64_t bits; + while ((bits = __insn_v1cmpeqi(v, 0)) == 0) + v = *++p; + + return ((const char *)p) + (CFZ(bits) >> 3) - s; +} +EXPORT_SYMBOL(strlen); -- cgit v1.3.1