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Diffstat (limited to 'sysdeps/arm/strlen.S')
| -rw-r--r-- | sysdeps/arm/strlen.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/sysdeps/arm/strlen.S b/sysdeps/arm/strlen.S new file mode 100644 index 0000000000..c812202bc3 --- /dev/null +++ b/sysdeps/arm/strlen.S @@ -0,0 +1,79 @@ +/* Copyright (C) 1998-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Code contributed by Matthew Wilcox <willy@odie.barnet.ac.uk> + + 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/>. */ + +/* Thumb requires excessive IT insns here. */ +#define NO_THUMB +#include <sysdep.h> + +/* size_t strlen(const char *S) + * entry: r0 -> string + * exit: r0 = len + */ + + .syntax unified + .text + +ENTRY(strlen) + bic r1, r0, $3 @ addr of word containing first byte + sfi_breg r1, \ + ldr r2, [\B], $4 @ get the first word + ands r3, r0, $3 @ how many bytes are duff? + rsb r0, r3, $0 @ get - that number into counter. + beq Laligned @ skip into main check routine if no + @ more +#ifdef __ARMEB__ + orr r2, r2, $0xff000000 @ set this byte to non-zero + subs r3, r3, $1 @ any more to do? + orrgt r2, r2, $0x00ff0000 @ if so, set this byte + subs r3, r3, $1 @ more? + orrgt r2, r2, $0x0000ff00 @ then set. +#else + orr r2, r2, $0x000000ff @ set this byte to non-zero + subs r3, r3, $1 @ any more to do? + orrgt r2, r2, $0x0000ff00 @ if so, set this byte + subs r3, r3, $1 @ more? + orrgt r2, r2, $0x00ff0000 @ then set. +#endif +Laligned: @ here, we have a word in r2. Does it + tst r2, $0x000000ff @ contain any zeroes? + tstne r2, $0x0000ff00 @ + tstne r2, $0x00ff0000 @ + tstne r2, $0xff000000 @ + addne r0, r0, $4 @ if not, the string is 4 bytes longer + sfi_breg r1, \ + ldrne r2, [\B], $4 @ and we continue to the next word + bne Laligned @ +Llastword: @ drop through to here once we find a +#ifdef __ARMEB__ + tst r2, $0xff000000 @ word that has a zero byte in it + addne r0, r0, $1 @ + tstne r2, $0x00ff0000 @ and add up to 3 bytes on to it + addne r0, r0, $1 @ + tstne r2, $0x0000ff00 @ (if first three all non-zero, 4th + addne r0, r0, $1 @ must be zero) +#else + tst r2, $0x000000ff @ word that has a zero byte in it + addne r0, r0, $1 @ + tstne r2, $0x0000ff00 @ and add up to 3 bytes on to it + addne r0, r0, $1 @ + tstne r2, $0x00ff0000 @ (if first three all non-zero, 4th + addne r0, r0, $1 @ must be zero) +#endif + DO_RET(lr) +END(strlen) +libc_hidden_builtin_def (strlen) |