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/* strlen(str) -- determine the length of the string STR.
Copyright (C) 2002-2015 Free Software Foundation, Inc.
Based on i486 version contributed by Ulrich Drepper <drepper@redhat.com>.
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>
#include "asm-syntax.h"
.text
ENTRY (strlen)
movq %rdi, %rcx /* Duplicate source pointer. */
andl $7, %ecx /* mask alignment bits */
movq %rdi, %rax /* duplicate destination. */
jz 1f /* aligned => start loop */
neg %ecx /* We need to align to 8 bytes. */
addl $8,%ecx
/* Search the first bytes directly. */
0: cmpb $0x0,(%rax) /* is byte NUL? */
je 2f /* yes => return */
incq %rax /* increment pointer */
decl %ecx
jnz 0b
1: movq $0xfefefefefefefeff,%r8 /* Save magic. */
.p2align 4 /* Align loop. */
4: /* Main Loop is unrolled 4 times. */
/* First unroll. */
movq (%rax), %rcx /* get double word (= 8 bytes) in question */
addq $8,%rax /* adjust pointer for next word */
movq %r8, %rdx /* magic value */
addq %rcx, %rdx /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc 3f /* highest byte is NUL => return pointer */
xorq %rcx, %rdx /* (word+magic)^word */
orq %r8, %rdx /* set all non-carry bits */
incq %rdx /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jnz 3f /* found NUL => return pointer */
/* Second unroll. */
movq (%rax), %rcx /* get double word (= 8 bytes) in question */
addq $8,%rax /* adjust pointer for next word */
movq %r8, %rdx /* magic value */
addq %rcx, %rdx /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc 3f /* highest byte is NUL => return pointer */
xorq %rcx, %rdx /* (word+magic)^word */
orq %r8, %rdx /* set all non-carry bits */
incq %rdx /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jnz 3f /* found NUL => return pointer */
/* Third unroll. */
movq (%rax), %rcx /* get double word (= 8 bytes) in question */
addq $8,%rax /* adjust pointer for next word */
movq %r8, %rdx /* magic value */
addq %rcx, %rdx /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc 3f /* highest byte is NUL => return pointer */
xorq %rcx, %rdx /* (word+magic)^word */
orq %r8, %rdx /* set all non-carry bits */
incq %rdx /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jnz 3f /* found NUL => return pointer */
/* Fourth unroll. */
movq (%rax), %rcx /* get double word (= 8 bytes) in question */
addq $8,%rax /* adjust pointer for next word */
movq %r8, %rdx /* magic value */
addq %rcx, %rdx /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc 3f /* highest byte is NUL => return pointer */
xorq %rcx, %rdx /* (word+magic)^word */
orq %r8, %rdx /* set all non-carry bits */
incq %rdx /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jz 4b /* no NUL found => continue loop */
.p2align 4 /* Align, it's a jump target. */
3: subq $8,%rax /* correct pointer increment. */
testb %cl, %cl /* is first byte NUL? */
jz 2f /* yes => return */
incq %rax /* increment pointer */
testb %ch, %ch /* is second byte NUL? */
jz 2f /* yes => return */
incq %rax /* increment pointer */
testl $0x00ff0000, %ecx /* is third byte NUL? */
jz 2f /* yes => return pointer */
incq %rax /* increment pointer */
testl $0xff000000, %ecx /* is fourth byte NUL? */
jz 2f /* yes => return pointer */
incq %rax /* increment pointer */
shrq $32, %rcx /* look at other half. */
testb %cl, %cl /* is first byte NUL? */
jz 2f /* yes => return */
incq %rax /* increment pointer */
testb %ch, %ch /* is second byte NUL? */
jz 2f /* yes => return */
incq %rax /* increment pointer */
testl $0xff0000, %ecx /* is third byte NUL? */
jz 2f /* yes => return pointer */
incq %rax /* increment pointer */
2:
subq %rdi, %rax /* compute difference to string start */
ret
END (strlen)
libc_hidden_builtin_def (strlen)
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