1 /* Copyright (C) 2000-2020 Free Software Foundation, Inc.
2 Contributed by David Mosberger (davidm@cs.arizona.edu).
3 EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>.
4 This file is part of the GNU C Library.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <https://www.gnu.org/licenses/>. */
20 /* Finds length of a 0-terminated string. */
38 ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned)
40 insqh $2, $16, $2 # U :
41 andnot $16, 7, $0 # E :
44 cmpbge $31, $1, $2 # E : $2 <- bitmask: bit i == 1 <==> i-th byte == 0
48 $loop: ldq $1, 8($0) # L :
49 addq $0, 8, $0 # E : addr += 8
50 cmpbge $31, $1, $2 # E :
56 subq $0, $16, $0 # E :
60 libc_hidden_builtin_def (strlen)