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glibc/sysdeps/powerpc/powerpc64/strpbrk.S
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/* Optimized strpbrk implementation for PowerPC64. | |
Copyright (C) 2014-2016 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) |