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6c4009 |
/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
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6c4009 |
For Intel 80x86, x>=3.
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6c4009 |
Copyright (C) 1994-2018 Free Software Foundation, Inc.
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6c4009 |
This file is part of the GNU C Library.
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6c4009 |
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>
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6c4009 |
Some optimisations by Alan Modra <Alan@SPRI.Levels.UniSA.Edu.Au>
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6c4009 |
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6c4009 |
The GNU C Library is free software; you can redistribute it and/or
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6c4009 |
modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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6c4009 |
version 2.1 of the License, or (at your option) any later version.
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6c4009 |
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6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
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6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
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6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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|
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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6c4009 |
You should have received a copy of the GNU Lesser General Public
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|
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6c4009 |
License along with the GNU C Library; if not, see
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6c4009 |
<http://www.gnu.org/licenses/>. */
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6c4009 |
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#include <sysdep.h>
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6c4009 |
#include "asm-syntax.h"
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6c4009 |
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6c4009 |
#define PARMS 4+8 /* space for 2 saved regs */
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6c4009 |
#define RTN PARMS
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6c4009 |
#define STR RTN
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#define CHR STR+4
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.text
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ENTRY (strrchr)
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pushl %edi /* Save callee-safe registers used here. */
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6c4009 |
cfi_adjust_cfa_offset (4)
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6c4009 |
cfi_rel_offset (edi, 0)
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6c4009 |
pushl %esi
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6c4009 |
cfi_adjust_cfa_offset (4)
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6c4009 |
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xorl %eax, %eax
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6c4009 |
movl STR(%esp), %esi
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6c4009 |
cfi_rel_offset (esi, 0)
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movl CHR(%esp), %ecx
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/* At the moment %ecx contains C. What we need for the
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6c4009 |
algorithm is C in all bytes of the dword. Avoid
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|
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6c4009 |
operations on 16 bit words because these require an
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6c4009 |
prefix byte (and one more cycle). */
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6c4009 |
movb %cl, %ch /* now it is 0|0|c|c */
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6c4009 |
movl %ecx, %edx
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6c4009 |
shll $16, %ecx /* now it is c|c|0|0 */
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6c4009 |
movw %dx, %cx /* and finally c|c|c|c */
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6c4009 |
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/* Before we start with the main loop we process single bytes
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6c4009 |
until the source pointer is aligned. This has two reasons:
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1. aligned 32-bit memory access is faster
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and (more important)
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6c4009 |
2. we process in the main loop 32 bit in one step although
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6c4009 |
we don't know the end of the string. But accessing at
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4-byte alignment guarantees that we never access illegal
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memory if this would not also be done by the trivial
|
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6c4009 |
implementation (this is because all processor inherent
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6c4009 |
boundaries are multiples of 4. */
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6c4009 |
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6c4009 |
testl $3, %esi /* correctly aligned ? */
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6c4009 |
jz L(19) /* yes => begin loop */
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6c4009 |
movb (%esi), %dl /* load byte in question (we need it twice) */
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6c4009 |
cmpb %dl, %cl /* compare byte */
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6c4009 |
jne L(11) /* target found => return */
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6c4009 |
movl %esi, %eax /* remember pointer as possible result */
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6c4009 |
L(11): orb %dl, %dl /* is NUL? */
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6c4009 |
jz L(2) /* yes => return NULL */
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6c4009 |
incl %esi /* increment pointer */
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6c4009 |
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Packit |
6c4009 |
testl $3, %esi /* correctly aligned ? */
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6c4009 |
jz L(19) /* yes => begin loop */
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6c4009 |
movb (%esi), %dl /* load byte in question (we need it twice) */
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6c4009 |
cmpb %dl, %cl /* compare byte */
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6c4009 |
jne L(12) /* target found => return */
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6c4009 |
movl %esi, %eax /* remember pointer as result */
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6c4009 |
L(12): orb %dl, %dl /* is NUL? */
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6c4009 |
jz L(2) /* yes => return NULL */
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6c4009 |
incl %esi /* increment pointer */
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6c4009 |
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6c4009 |
testl $3, %esi /* correctly aligned ? */
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6c4009 |
jz L(19) /* yes => begin loop */
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6c4009 |
movb (%esi), %dl /* load byte in question (we need it twice) */
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6c4009 |
cmpb %dl, %cl /* compare byte */
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6c4009 |
jne L(13) /* target found => return */
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6c4009 |
movl %esi, %eax /* remember pointer as result */
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6c4009 |
L(13): orb %dl, %dl /* is NUL? */
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6c4009 |
jz L(2) /* yes => return NULL */
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6c4009 |
incl %esi /* increment pointer */
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/* No we have reached alignment. */
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jmp L(19) /* begin loop */
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/* We exit the loop if adding MAGIC_BITS to LONGWORD fails to
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change any of the hole bits of LONGWORD.
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6c4009 |
|
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1) Is this safe? Will it catch all the zero bytes?
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6c4009 |
Suppose there is a byte with all zeros. Any carry bits
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propagating from its left will fall into the hole at its
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least significant bit and stop. Since there will be no
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carry from its most significant bit, the LSB of the
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byte to the left will be unchanged, and the zero will be
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6c4009 |
detected.
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2) Is this worthwhile? Will it ignore everything except
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|
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zero bytes? Suppose every byte of LONGWORD has a bit set
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somewhere. There will be a carry into bit 8. If bit 8
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6c4009 |
is set, this will carry into bit 16. If bit 8 is clear,
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one of bits 9-15 must be set, so there will be a carry
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into bit 16. Similarly, there will be a carry into bit
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24. If one of bits 24-31 is set, there will be a carry
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into bit 32 (=carry flag), so all of the hole bits will
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be changed.
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6c4009 |
|
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6c4009 |
3) But wait! Aren't we looking for C, not zero?
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6c4009 |
Good point. So what we do is XOR LONGWORD with a longword,
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6c4009 |
each of whose bytes is C. This turns each byte that is C
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6c4009 |
into a zero. */
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6c4009 |
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6c4009 |
/* Each round the main loop processes 16 bytes. */
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6c4009 |
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6c4009 |
/* Jump to here when the character is detected. We chose this
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6c4009 |
way around because the character one is looking for is not
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6c4009 |
as frequent as the rest and taking a conditional jump is more
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6c4009 |
expensive than ignoring it.
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6c4009 |
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6c4009 |
Some more words to the code below: it might not be obvious why
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6c4009 |
we decrement the source pointer here. In the loop the pointer
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6c4009 |
is not pre-incremented and so it still points before the word
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6c4009 |
we are looking at. But you should take a look at the instruction
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6c4009 |
which gets executed before we get into the loop: `addl $16, %esi'.
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6c4009 |
This makes the following subs into adds. */
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6c4009 |
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6c4009 |
/* These fill bytes make the main loop be correctly aligned.
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6c4009 |
We cannot use align because it is not the following instruction
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6c4009 |
which should be aligned. */
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6c4009 |
.byte 0, 0
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6c4009 |
#ifndef PROF
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/* Profiling adds some code and so changes the alignment. */
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6c4009 |
.byte 0
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6c4009 |
#endif
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6c4009 |
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6c4009 |
L(4): subl $4, %esi /* adjust pointer */
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6c4009 |
L(41): subl $4, %esi
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6c4009 |
L(42): subl $4, %esi
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6c4009 |
L(43): testl $0xff000000, %edx /* is highest byte == C? */
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6c4009 |
jnz L(33) /* no => try other bytes */
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6c4009 |
leal 15(%esi), %eax /* store address as result */
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6c4009 |
jmp L(1) /* and start loop again */
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6c4009 |
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6c4009 |
L(3): subl $4, %esi /* adjust pointer */
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6c4009 |
L(31): subl $4, %esi
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6c4009 |
L(32): subl $4, %esi
|
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6c4009 |
L(33): testl $0xff0000, %edx /* is C in third byte? */
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6c4009 |
jnz L(51) /* no => try other bytes */
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6c4009 |
leal 14(%esi), %eax /* store address as result */
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6c4009 |
jmp L(1) /* and start loop again */
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6c4009 |
|
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6c4009 |
L(51):
|
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6c4009 |
/* At this point we know that the byte is in one of the lower bytes.
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6c4009 |
We make a guess and correct it if necessary. This reduces the
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|
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6c4009 |
number of necessary jumps. */
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|
Packit |
6c4009 |
leal 12(%esi), %eax /* guess address of lowest byte as result */
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|
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6c4009 |
testb %dh, %dh /* is guess correct? */
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Packit |
6c4009 |
jnz L(1) /* yes => start loop */
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|
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6c4009 |
leal 13(%esi), %eax /* correct guess to second byte */
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6c4009 |
|
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6c4009 |
L(1): addl $16, %esi /* increment pointer for full round */
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6c4009 |
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6c4009 |
L(19): movl (%esi), %edx /* get word (= 4 bytes) in question */
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|
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6c4009 |
movl $0xfefefeff, %edi /* magic value */
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|
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6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
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6c4009 |
carry bits reported for each byte which
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|
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6c4009 |
is *not* 0 */
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6c4009 |
|
|
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6c4009 |
/* According to the algorithm we had to reverse the effect of the
|
|
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6c4009 |
XOR first and then test the overflow bits. But because the
|
|
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6c4009 |
following XOR would destroy the carry flag and it would (in a
|
|
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6c4009 |
representation with more than 32 bits) not alter then last
|
|
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6c4009 |
overflow, we can now test this condition. If no carry is signaled
|
|
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6c4009 |
no overflow must have occurred in the last byte => it was 0. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
jnc L(20) /* found NUL => check last word */
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|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* We are only interested in carry bits that change due to the
|
|
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6c4009 |
previous add, so remove original bits */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* (word+magic)^word */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now test for the other three overflow bits. */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* If at least one byte of the word is C we don't get 0 in %edi. */
|
|
Packit |
6c4009 |
jnz L(20) /* found NUL => check last word */
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|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now we made sure the dword does not contain the character we are
|
|
Packit |
6c4009 |
looking for. But because we deal with strings we have to check
|
|
Packit |
6c4009 |
for the end of string before testing the next dword. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
xorl %ecx, %edx /* XOR with word c|c|c|c => bytes of str == c
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|
Packit |
6c4009 |
are now 0 */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(4) /* highest byte is C => examine dword */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* ((word^charmask)+magic)^(word^charmask) */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jnz L(3) /* C is detected in the word => examine it */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
movl 4(%esi), %edx /* get word (= 4 bytes) in question */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(21) /* found NUL => check last word */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* (word+magic)^word */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jnz L(21) /* found NUL => check last word */
|
|
Packit |
6c4009 |
xorl %ecx, %edx /* XOR with word c|c|c|c => bytes of str == c
|
|
Packit |
6c4009 |
are now 0 */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(41) /* highest byte is C => examine dword */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* ((word^charmask)+magic)^(word^charmask) */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jnz L(31) /* C is detected in the word => examine it */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
movl 8(%esi), %edx /* get word (= 4 bytes) in question */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(22) /* found NUL => check last word */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* (word+magic)^word */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jnz L(22) /* found NUL => check last word */
|
|
Packit |
6c4009 |
xorl %ecx, %edx /* XOR with word c|c|c|c => bytes of str == c
|
|
Packit |
6c4009 |
are now 0 */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(42) /* highest byte is C => examine dword */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* ((word^charmask)+magic)^(word^charmask) */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jnz L(32) /* C is detected in the word => examine it */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
movl 12(%esi), %edx /* get word (= 4 bytes) in question */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(23) /* found NUL => check last word */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* (word+magic)^word */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jnz L(23) /* found NUL => check last word */
|
|
Packit |
6c4009 |
xorl %ecx, %edx /* XOR with word c|c|c|c => bytes of str == c
|
|
Packit |
6c4009 |
are now 0 */
|
|
Packit |
6c4009 |
movl $0xfefefeff, %edi /* magic value */
|
|
Packit |
6c4009 |
addl %edx, %edi /* add the magic value to the word. We get
|
|
Packit |
6c4009 |
carry bits reported for each byte which
|
|
Packit |
6c4009 |
is *not* 0 */
|
|
Packit |
6c4009 |
jnc L(43) /* highest byte is C => examine dword */
|
|
Packit |
6c4009 |
xorl %edx, %edi /* ((word^charmask)+magic)^(word^charmask) */
|
|
Packit |
6c4009 |
orl $0xfefefeff, %edi /* set all non-carry bits */
|
|
Packit |
6c4009 |
incl %edi /* add 1: if one carry bit was *not* set
|
|
Packit |
6c4009 |
the addition will not result in 0. */
|
|
Packit |
6c4009 |
jz L(1) /* C is not detected => restart loop */
|
|
Packit |
6c4009 |
jmp L(33) /* examine word */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
L(23): addl $4, %esi /* adjust pointer */
|
|
Packit |
6c4009 |
L(22): addl $4, %esi
|
|
Packit |
6c4009 |
L(21): addl $4, %esi
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* What remains to do is to test which byte the NUL char is and
|
|
Packit |
6c4009 |
whether the searched character appears in one of the bytes
|
|
Packit |
6c4009 |
before. A special case is that the searched byte maybe NUL.
|
|
Packit |
6c4009 |
In this case a pointer to the terminating NUL char has to be
|
|
Packit |
6c4009 |
returned. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
L(20): cmpb %cl, %dl /* is first byte == C? */
|
|
Packit |
6c4009 |
jne L(24) /* no => skip */
|
|
Packit |
6c4009 |
movl %esi, %eax /* store address as result */
|
|
Packit |
6c4009 |
L(24): testb %dl, %dl /* is first byte == NUL? */
|
|
Packit |
6c4009 |
jz L(2) /* yes => return */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
cmpb %cl, %dh /* is second byte == C? */
|
|
Packit |
6c4009 |
jne L(25) /* no => skip */
|
|
Packit |
6c4009 |
leal 1(%esi), %eax /* store address as result */
|
|
Packit |
6c4009 |
L(25): testb %dh, %dh /* is second byte == NUL? */
|
|
Packit |
6c4009 |
jz L(2) /* yes => return */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
shrl $16,%edx /* make upper bytes accessible */
|
|
Packit |
6c4009 |
cmpb %cl, %dl /* is third byte == C */
|
|
Packit |
6c4009 |
jne L(26) /* no => skip */
|
|
Packit |
6c4009 |
leal 2(%esi), %eax /* store address as result */
|
|
Packit |
6c4009 |
L(26): testb %dl, %dl /* is third byte == NUL */
|
|
Packit |
6c4009 |
jz L(2) /* yes => return */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
cmpb %cl, %dh /* is fourth byte == C */
|
|
Packit |
6c4009 |
jne L(2) /* no => skip */
|
|
Packit |
6c4009 |
leal 3(%esi), %eax /* store address as result */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
L(2): popl %esi /* restore saved register content */
|
|
Packit |
6c4009 |
cfi_adjust_cfa_offset (-4)
|
|
Packit |
6c4009 |
cfi_restore (esi)
|
|
Packit |
6c4009 |
popl %edi
|
|
Packit |
6c4009 |
cfi_adjust_cfa_offset (-4)
|
|
Packit |
6c4009 |
cfi_restore (edi)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
ret
|
|
Packit |
6c4009 |
END (strrchr)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
weak_alias (strrchr, rindex)
|
|
Packit |
6c4009 |
libc_hidden_builtin_def (strrchr)
|