mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
90 lines
2.4 KiB
ArmAsm
90 lines
2.4 KiB
ArmAsm
/* Copyright (C) 2000-2013 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)
|