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glibc/sysdeps/i386/memchr.S
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights 
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

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ArmAsm
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/* memchr (str, chr, len) -- Return pointer to first occurrence of CHR in STR
less than LEN. For Intel 80x86, x>=3.
Copyright (C) 1994-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>
Optimised a little by Alan Modra <Alan@SPRI.Levels.UniSA.Edu.Au>
This version is developed using the same algorithm as the fast C
version which carries the following introduction:
Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
with help from Dan Sahlin (dan@sics.se) and
commentary by Jim Blandy (jimb@ai.mit.edu);
adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
and implemented by Roland McGrath (roland@ai.mit.edu).
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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
#define PARMS 4+8 /* space for 2 saved regs */
#define RTN PARMS
#define STR RTN
#define CHR STR+4
#define LEN CHR+4
.text
ENTRY (__memchr)
/* Save callee-safe registers used in this function. */
pushl %esi
cfi_adjust_cfa_offset (4)
pushl %edi
cfi_adjust_cfa_offset (4)
cfi_rel_offset (edi, 0)
/* Load parameters into registers. */
movl STR(%esp), %eax /* str: pointer to memory block. */
movl CHR(%esp), %edx /* c: byte we are looking for. */
movl LEN(%esp), %esi /* len: length of memory block. */
cfi_rel_offset (esi, 4)
/* If my must not test more than three characters test
them one by one. This is especially true for 0. */
cmpl $4, %esi
jb L(3)
/* At the moment %edx contains CHR. What we need for the
algorithm is CHR in all bytes of the dword. Avoid
operations on 16 bit words because these require an
prefix byte (and one more cycle). */
movb %dl, %dh /* Now it is 0|0|c|c */
movl %edx, %ecx
shll $16, %edx /* Now c|c|0|0 */
movw %cx, %dx /* And finally c|c|c|c */
/* Better performance can be achieved if the word (32
bit) memory access is aligned on a four-byte-boundary.
So process first bytes one by one until boundary is
reached. Don't use a loop for better performance. */
testb $3, %al /* correctly aligned ? */
je L(2) /* yes => begin loop */
cmpb %dl, (%eax) /* compare byte */
je L(9) /* target found => return */
incl %eax /* increment source pointer */
decl %esi /* decrement length counter */
je L(4) /* len==0 => return NULL */
testb $3, %al /* correctly aligned ? */
je L(2) /* yes => begin loop */
cmpb %dl, (%eax) /* compare byte */
je L(9) /* target found => return */
incl %eax /* increment source pointer */
decl %esi /* decrement length counter */
je L(4) /* len==0 => return NULL */
testb $3, %al /* correctly aligned ? */
je L(2) /* yes => begin loop */
cmpb %dl, (%eax) /* compare byte */
je L(9) /* target found => return */
incl %eax /* increment source pointer */
decl %esi /* decrement length counter */
/* no test for len==0 here, because this is done in the
loop head */
jmp L(2)
/* We exit the loop if adding MAGIC_BITS to LONGWORD fails to
change any of the hole bits of LONGWORD.
1) Is this safe? Will it catch all the zero bytes?
Suppose there is a byte with all zeros. Any carry bits
propagating from its left will fall into the hole at its
least significant bit and stop. Since there will be no
carry from its most significant bit, the LSB of the
byte to the left will be unchanged, and the zero will be
detected.
2) Is this worthwhile? Will it ignore everything except
zero bytes? Suppose every byte of LONGWORD has a bit set
somewhere. There will be a carry into bit 8. If bit 8
is set, this will carry into bit 16. If bit 8 is clear,
one of bits 9-15 must be set, so there will be a carry
into bit 16. Similarly, there will be a carry into bit
24. If one of bits 24-31 is set, there will be a carry
into bit 32 (=carry flag), so all of the hole bits will
be changed.
3) But wait! Aren't we looking for CHR, not zero?
Good point. So what we do is XOR LONGWORD with a longword,
each of whose bytes is CHR. This turns each byte that is CHR
into a zero. */
/* Each round the main loop processes 16 bytes. */
ALIGN (4)
L(1): movl (%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
/* According to the algorithm we had to reverse the effect of the
XOR first and then test the overflow bits. But because the
following XOR would destroy the carry flag and it would (in a
representation with more than 32 bits) not alter then last
overflow, we can now test this condition. If no carry is signaled
no overflow must have occurred in the last byte => it was 0. */
jnc L(8)
/* We are only interested in carry bits that change due to the
previous add, so remove original bits */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
/* Now test for the other three overflow bits. */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
/* If at least one byte of the word is CHR we don't get 0 in %edi. */
jnz L(8) /* found it => return pointer */
/* This process is unfolded four times for better performance.
we don't increment the source pointer each time. Instead we
use offsets and increment by 16 in each run of the loop. But
before probing for the matching byte we need some extra code
(following LL(13) below). Even the len can be compared with
constants instead of decrementing each time. */
movl 4(%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc L(7) /* highest byte is CHR => return pointer */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jnz L(7) /* found it => return pointer */
movl 8(%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc L(6) /* highest byte is CHR => return pointer */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jnz L(6) /* found it => return pointer */
movl 12(%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc L(5) /* highest byte is CHR => return pointer */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jnz L(5) /* found it => return pointer */
/* Adjust both counters for a full round, i.e. 16 bytes. */
addl $16, %eax
L(2): subl $16, %esi
jae L(1) /* Still more than 16 bytes remaining */
/* Process remaining bytes separately. */
cmpl $4-16, %esi /* rest < 4 bytes? */
jb L(3) /* yes, than test byte by byte */
movl (%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc L(8) /* highest byte is CHR => return pointer */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jne L(8) /* found it => return pointer */
addl $4, %eax /* adjust source pointer */
cmpl $8-16, %esi /* rest < 8 bytes? */
jb L(3) /* yes, than test byte by byte */
movl (%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc L(8) /* highest byte is CHR => return pointer */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jne L(8) /* found it => return pointer */
addl $4, %eax /* adjust source pointer */
cmpl $12-16, %esi /* rest < 12 bytes? */
jb L(3) /* yes, than test byte by byte */
movl (%eax), %ecx /* get word (= 4 bytes) in question */
movl $0xfefefeff, %edi /* magic value */
xorl %edx, %ecx /* XOR with word c|c|c|c => bytes of str == c
are now 0 */
addl %ecx, %edi /* add the magic value to the word. We get
carry bits reported for each byte which
is *not* 0 */
jnc L(8) /* highest byte is CHR => return pointer */
xorl %ecx, %edi /* ((word^charmask)+magic)^(word^charmask) */
orl $0xfefefeff, %edi /* set all non-carry bits */
incl %edi /* add 1: if one carry bit was *not* set
the addition will not result in 0. */
jne L(8) /* found it => return pointer */
addl $4, %eax /* adjust source pointer */
/* Check the remaining bytes one by one. */
L(3): andl $3, %esi /* mask out uninteresting bytes */
jz L(4) /* no remaining bytes => return NULL */
cmpb %dl, (%eax) /* compare byte with CHR */
je L(9) /* equal, than return pointer */
incl %eax /* increment source pointer */
decl %esi /* decrement length */
jz L(4) /* no remaining bytes => return NULL */
cmpb %dl, (%eax) /* compare byte with CHR */
je L(9) /* equal, than return pointer */
incl %eax /* increment source pointer */
decl %esi /* decrement length */
jz L(4) /* no remaining bytes => return NULL */
cmpb %dl, (%eax) /* compare byte with CHR */
je L(9) /* equal, than return pointer */
L(4): /* no byte found => return NULL */
xorl %eax, %eax
jmp L(9)
/* add missing source pointer increments */
L(5): addl $4, %eax
L(6): addl $4, %eax
L(7): addl $4, %eax
/* Test for the matching byte in the word. %ecx contains a NUL
char in the byte which originally was the byte we are looking
at. */
L(8): testb %cl, %cl /* test first byte in dword */
jz L(9) /* if zero => return pointer */
incl %eax /* increment source pointer */
testb %ch, %ch /* test second byte in dword */
jz L(9) /* if zero => return pointer */
incl %eax /* increment source pointer */
testl $0xff0000, %ecx /* test third byte in dword */
jz L(9) /* if zero => return pointer */
incl %eax /* increment source pointer */
/* No further test needed we we know it is one of the four bytes. */
L(9): popl %edi /* pop saved registers */
cfi_adjust_cfa_offset (-4)
cfi_restore (edi)
popl %esi
cfi_adjust_cfa_offset (-4)
cfi_restore (esi)
ret
END (__memchr)
weak_alias (__memchr, memchr)
libc_hidden_builtin_def (memchr)
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