projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| 19db7d81 UD |
2 | Contributed by David Mosberger (davidm@cs.arizona.edu). |
| 3 | EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. | |
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4 | This file is part of the GNU C Library. |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
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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. | |
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10 | |
| 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 | |
| 3214b89b | 14 | Lesser General Public License for more details. |
| 19db7d81 | 15 | |
| 3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
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19 | |
| 20 | /* Finds length of a 0-terminated string. */ | |
| 21 | ||
| 22 | #include <sysdep.h> | |
| 23 | ||
| 24 | .arch ev6 | |
| 25 | .set noreorder | |
| 26 | .set noat | |
| 27 | ||
| 28 | ENTRY(strlen) | |
| 29 | #ifdef PROF | |
| 30 | ldgp gp, 0(pv) | |
| 31 | lda AT, _mcount | |
| 32 | jsr AT, (AT), _mcount | |
| 33 | .prologue 1 | |
| 34 | #else | |
| 35 | .prologue 0 | |
| 36 | #endif | |
| 37 | ||
| 38 | ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned) | |
| 39 | lda $2, -1($31) # E : | |
| 40 | insqh $2, $16, $2 # U : | |
| 41 | andnot $16, 7, $0 # E : | |
| 42 | ||
| 43 | or $2, $1, $1 # E : | |
| 44 | cmpbge $31, $1, $2 # E : $2 <- bitmask: bit i == 1 <==> i-th byte == 0 | |
| 45 | nop # E : | |
| 46 | bne $2, $found # U : | |
| 47 | ||
| 48 | $loop: ldq $1, 8($0) # L : | |
| 49 | addq $0, 8, $0 # E : addr += 8 | |
| 50 | cmpbge $31, $1, $2 # E : | |
| 51 | beq $2, $loop # U : | |
| 52 | ||
| 53 | $found: | |
| 54 | cttz $2, $3 # U0 : | |
| 55 | addq $0, $3, $0 # E : | |
| 56 | subq $0, $16, $0 # E : | |
| 57 | ret $31, ($26) # L0 : | |
| 58 | ||
| 59 | END(strlen) | |
| 79b7c863 | 60 | libc_hidden_builtin_def (strlen) |