| /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| Contributed by David Mosberger (davidm@cs.arizona.edu). |
| EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. |
| 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/>. */ |
| |
| /* Finds length of a 0-terminated string. */ |
| |
| #include <sysdep.h> |
| |
| .arch ev6 |
| .set noreorder |
| .set noat |
| |
| ENTRY(strlen) |
| #ifdef PROF |
| ldgp gp, 0(pv) |
| lda AT, _mcount |
| jsr AT, (AT), _mcount |
| .prologue 1 |
| #else |
| .prologue 0 |
| #endif |
| |
| ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned) |
| lda $2, -1($31) # E : |
| insqh $2, $16, $2 # U : |
| andnot $16, 7, $0 # E : |
| |
| or $2, $1, $1 # E : |
| cmpbge $31, $1, $2 # E : $2 <- bitmask: bit i == 1 <==> i-th byte == 0 |
| nop # E : |
| bne $2, $found # U : |
| |
| $loop: ldq $1, 8($0) # L : |
| addq $0, 8, $0 # E : addr += 8 |
| cmpbge $31, $1, $2 # E : |
| beq $2, $loop # U : |
| |
| $found: |
| cttz $2, $3 # U0 : |
| addq $0, $3, $0 # E : |
| subq $0, $16, $0 # E : |
| ret $31, ($26) # L0 : |
| |
| END(strlen) |
| libc_hidden_builtin_def (strlen) |
