mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 19:00:09 +00:00
136 lines
3.0 KiB
ArmAsm
136 lines
3.0 KiB
ArmAsm
/* Optimized strpbrk implementation for PowerPC64.
|
|
Copyright (C) 2014-2015 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/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* char [r3] *strpbrk(const char [r4] *s, const char [r5] *accept) */
|
|
|
|
EALIGN (strpbrk, 4, 0)
|
|
CALL_MCOUNT 3
|
|
|
|
lbz r10,0(r4)
|
|
cmpdi cr7,r10,0 /* accept[0] == '\0' ? */
|
|
beq cr7,L(nullfound)
|
|
|
|
/* The idea to speed up the algorithm is to create a lookup table
|
|
for fast check if input character should be considered. For ASCII
|
|
or ISO-8859-X character sets it has 256 positions. */
|
|
|
|
/* PPC64 ELF ABI stack is aligned to 16 bytes. */
|
|
addi r9,r1,-256
|
|
/* Clear the table with 0 values */
|
|
li r6, 0
|
|
li r7, 4
|
|
mtctr r7
|
|
mr r8, r9
|
|
.align 4
|
|
L(zerohash):
|
|
std r6, 0(r8)
|
|
std r6, 8(r8)
|
|
std r6, 16(r8)
|
|
std r6, 24(r8)
|
|
std r6, 32(r8)
|
|
std r6, 40(r8)
|
|
std r6, 48(r8)
|
|
std r6, 56(r8)
|
|
addi r8, r8, 64
|
|
bdnz L(zerohash)
|
|
|
|
/* Initialize the table as:
|
|
for (i=0; accept[i]; i++
|
|
table[accept[i]]] = 1 */
|
|
li r0,1
|
|
.align 4
|
|
L(init_table):
|
|
stbx r0,r9,r10
|
|
lbzu r10,1(r4)
|
|
cmpdi r0,r10,0
|
|
bne cr0,L(init_table)
|
|
L(finish_table):
|
|
/* set table[0] = 1 */
|
|
li r4,1
|
|
stb r4,0(r9)
|
|
b L(mainloop)
|
|
|
|
/* Unrool the loop 4 times and check using the table as:
|
|
i = 0;
|
|
while (1)
|
|
{
|
|
if (table[input[i++]] == 1)
|
|
return (s[i -1] ? s + i - 1: NULL);
|
|
if (table[input[i++]] == 1)
|
|
return (s[i -1] ? s + i - 1: NULL);
|
|
if (table[input[i++]] == 1)
|
|
return (s[i -1] ? s + i - 1: NULL);
|
|
if (table[input[i++]] == 1)
|
|
return (s[i -1] ? s + i - 1: NULL);
|
|
} */
|
|
.align 4
|
|
L(unroll):
|
|
lbz r0,1(r3)
|
|
lbzx r8,r9,r0
|
|
cmpwi cr6,r8,1
|
|
beq cr6,L(checkend2)
|
|
lbz r10,2(r3)
|
|
lbzx r4,r9,r10
|
|
cmpwi cr7,r4,1
|
|
beq cr7,L(checkend3)
|
|
lbz r12,3(r3)
|
|
addi r3,r3,4
|
|
lbzx r11,r9,r12
|
|
cmpwi cr0,r11,1
|
|
beq cr0,L(checkend)
|
|
L(mainloop):
|
|
lbz r12,0(r3)
|
|
addi r11,r3,1
|
|
addi r5,r3,2
|
|
addi r7,r3,3
|
|
lbzx r6,r9,r12
|
|
cmpwi cr1,r6,1
|
|
bne cr1,L(unroll)
|
|
cmpdi cr0,r12,0
|
|
beq cr0,L(nullfound)
|
|
L(end):
|
|
blr
|
|
|
|
.align 4
|
|
L(checkend):
|
|
cmpdi cr1,r12,0
|
|
mr r3,r7
|
|
bne cr1,L(end)
|
|
L(nullfound):
|
|
/* return NULL */
|
|
li 3,0
|
|
blr
|
|
|
|
.align 4
|
|
L(checkend2):
|
|
cmpdi cr7,r0,0
|
|
mr r3,r11
|
|
beq cr7,L(nullfound)
|
|
blr
|
|
|
|
.align 4
|
|
L(checkend3):
|
|
cmpdi cr6,r10,0
|
|
mr r3,r5
|
|
beq cr6,L(nullfound)
|
|
blr
|
|
END (strpbrk)
|
|
libc_hidden_builtin_def (strpbrk)
|