| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2000-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Return pointer to first occurrence of CH in STR. */ |
| 19 | |
| 20 | #include <sysdep.h> |
| 21 | |
| 22 | .set noreorder |
| 23 | .set noat |
| 24 | |
| 25 | ENTRY(__rawmemchr) |
| 26 | #ifdef PROF |
| 27 | ldgp gp, 0(pv) |
| 28 | lda AT, _mcount |
| 29 | jsr AT, (AT), _mcount |
| 30 | .prologue 1 |
| 31 | #else |
| 32 | .prologue 0 |
| 33 | #endif |
| 34 | |
| 35 | zapnot a1, 1, a1 # e0 : zero extend the search character |
| 36 | ldq_u t0, 0(a0) # .. e1 : load first quadword |
| 37 | sll a1, 8, t5 # e0 : replicate the search character |
| 38 | andnot a0, 7, v0 # .. e1 : align our loop pointer |
| 39 | |
| 40 | or t5, a1, a1 # e0 : |
| 41 | lda t4, -1 # .. e1 : build garbage mask |
| 42 | sll a1, 16, t5 # e0 : |
| 43 | unop # : |
| 44 | |
| 45 | mskqh t4, a0, t4 # e0 : |
| 46 | or t5, a1, a1 # .. e1 : |
| 47 | sll a1, 32, t5 # e0 : |
| 48 | cmpbge zero, t4, t4 # .. e1 : bits set iff byte is garbage |
| 49 | |
| 50 | or t5, a1, a1 # e0 : |
| 51 | xor t0, a1, t1 # .. e1 : make bytes == c zero |
| 52 | cmpbge zero, t1, t3 # e0 : bits set iff byte == c |
| 53 | unop # : |
| 54 | |
| 55 | andnot t3, t4, t0 # e0 : clear garbage bits |
| 56 | fnop # .. fa : |
| 57 | unop # : |
| 58 | bne t0, $found # .. e1 (zdb) |
| 59 | |
| 60 | .align 4 |
| 61 | $loop: |
| 62 | ldq t0, 8(v0) # e0 : |
| 63 | addq v0, 8, v0 # .. e1 : |
| 64 | nop # e0 : |
| 65 | xor t0, a1, t1 # .. e1 (ev5 data stall) |
| 66 | |
| 67 | cmpbge zero, t1, t0 # e0 : bits set iff byte == c |
| 68 | beq t0, $loop # .. e1 (zdb) |
| 69 | |
| 70 | $found: |
| 71 | negq t0, t1 # e0 : clear all but least set bit |
| 72 | and t0, t1, t0 # e1 (stall) |
| 73 | and t0, 0xf0, t2 # e0 : binary search for that set bit |
| 74 | and t0, 0xcc, t3 # .. e1 : |
| 75 | |
| 76 | and t0, 0xaa, t4 # e0 : |
| 77 | cmovne t2, 4, t2 # .. e1 : |
| 78 | cmovne t3, 2, t3 # e0 : |
| 79 | cmovne t4, 1, t4 # .. e1 : |
| 80 | |
| 81 | addq t2, t3, t2 # e0 : |
| 82 | addq v0, t4, v0 # .. e1 : |
| 83 | addq v0, t2, v0 # e0 : |
| 84 | ret # .. e1 : |
| 85 | |
| 86 | END(__rawmemchr) |
| 87 | |
| 88 | libc_hidden_def (__rawmemchr) |
| 89 | weak_alias (__rawmemchr, rawmemchr) |