| /* Copyright (C) 2000-2018 Free Software Foundation, Inc. |
| 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/>. */ |
| |
| /* Return pointer to first occurrence of CH in STR. */ |
| |
| #include <sysdep.h> |
| |
| .set noreorder |
| .set noat |
| |
| ENTRY(__rawmemchr) |
| #ifdef PROF |
| ldgp gp, 0(pv) |
| lda AT, _mcount |
| jsr AT, (AT), _mcount |
| .prologue 1 |
| #else |
| .prologue 0 |
| #endif |
| |
| zapnot a1, 1, a1 # e0 : zero extend the search character |
| ldq_u t0, 0(a0) # .. e1 : load first quadword |
| sll a1, 8, t5 # e0 : replicate the search character |
| andnot a0, 7, v0 # .. e1 : align our loop pointer |
| |
| or t5, a1, a1 # e0 : |
| lda t4, -1 # .. e1 : build garbage mask |
| sll a1, 16, t5 # e0 : |
| unop # : |
| |
| mskqh t4, a0, t4 # e0 : |
| or t5, a1, a1 # .. e1 : |
| sll a1, 32, t5 # e0 : |
| cmpbge zero, t4, t4 # .. e1 : bits set iff byte is garbage |
| |
| or t5, a1, a1 # e0 : |
| xor t0, a1, t1 # .. e1 : make bytes == c zero |
| cmpbge zero, t1, t3 # e0 : bits set iff byte == c |
| unop # : |
| |
| andnot t3, t4, t0 # e0 : clear garbage bits |
| fnop # .. fa : |
| unop # : |
| bne t0, $found # .. e1 (zdb) |
| |
| .align 4 |
| $loop: |
| ldq t0, 8(v0) # e0 : |
| addq v0, 8, v0 # .. e1 : |
| nop # e0 : |
| xor t0, a1, t1 # .. e1 (ev5 data stall) |
| |
| cmpbge zero, t1, t0 # e0 : bits set iff byte == c |
| beq t0, $loop # .. e1 (zdb) |
| |
| $found: |
| negq t0, t1 # e0 : clear all but least set bit |
| and t0, t1, t0 # e1 (stall) |
| and t0, 0xf0, t2 # e0 : binary search for that set bit |
| and t0, 0xcc, t3 # .. e1 : |
| |
| and t0, 0xaa, t4 # e0 : |
| cmovne t2, 4, t2 # .. e1 : |
| cmovne t3, 2, t3 # e0 : |
| cmovne t4, 1, t4 # .. e1 : |
| |
| addq t2, t3, t2 # e0 : |
| addq v0, t4, v0 # .. e1 : |
| addq v0, t2, v0 # e0 : |
| ret # .. e1 : |
| |
| END(__rawmemchr) |
| |
| libc_hidden_def (__rawmemchr) |
| weak_alias (__rawmemchr, rawmemchr) |