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/* strcpy/stpcpy - copy a string returning pointer to start/end.
Copyright (C) 2013-2021 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
<https://www.gnu.org/licenses/>. */
/* To build as stpcpy, define BUILD_STPCPY before compiling this file.
To test the page crossing code path more thoroughly, compile with
-DSTRCPY_TEST_PAGE_CROSS - this will force all unaligned copies through
the slower entry path. This option is not intended for production use. */
#include <sysdep.h>
/* Assumptions:
*
* ARMv8-a, AArch64, Advanced SIMD.
* MTE compatible.
*/
/* Arguments and results. */
#define dstin x0
#define srcin x1
#define result x0
#define src x2
#define dst x3
#define len x4
#define synd x4
#define tmp x5
#define wtmp w5
#define shift x5
#define data1 x6
#define dataw1 w6
#define data2 x7
#define dataw2 w7
#define dataq q0
#define vdata v0
#define vhas_nul v1
#define vrepmask v2
#define vend v3
#define dend d3
#define dataq2 q1
#ifdef BUILD_STPCPY
# define STRCPY __stpcpy
# define IFSTPCPY(X,...) X,__VA_ARGS__
#else
# define STRCPY strcpy
# define IFSTPCPY(X,...)
#endif
/* Core algorithm:
For each 16-byte chunk we calculate a 64-bit syndrome value with four bits
per byte. For even bytes, bits 0-3 are set if the relevant byte matched the
requested character or the byte is NUL. Bits 4-7 must be zero. Bits 4-7 are
set likewise for odd bytes so that adjacent bytes can be merged. Since the
bits in the syndrome reflect the order in which things occur in the original
string, counting trailing zeros identifies exactly which byte matched. */
ENTRY (STRCPY)
PTR_ARG (0)
PTR_ARG (1)
bic src, srcin, 15
mov wtmp, 0xf00f
ld1 {vdata.16b}, [src]
dup vrepmask.8h, wtmp
cmeq vhas_nul.16b, vdata.16b, 0
lsl shift, srcin, 2
and vhas_nul.16b, vhas_nul.16b, vrepmask.16b
addp vend.16b, vhas_nul.16b, vhas_nul.16b
fmov synd, dend
lsr synd, synd, shift
cbnz synd, L(tail)
ldr dataq, [src, 16]!
cmeq vhas_nul.16b, vdata.16b, 0
and vhas_nul.16b, vhas_nul.16b, vrepmask.16b
addp vend.16b, vhas_nul.16b, vhas_nul.16b
fmov synd, dend
cbz synd, L(start_loop)
#ifndef __AARCH64EB__
rbit synd, synd
#endif
sub tmp, src, srcin
clz len, synd
add len, tmp, len, lsr 2
tbz len, 4, L(less16)
sub tmp, len, 15
ldr dataq, [srcin]
ldr dataq2, [srcin, tmp]
str dataq, [dstin]
str dataq2, [dstin, tmp]
IFSTPCPY (add result, dstin, len)
ret
.p2align 4,,8
L(tail):
rbit synd, synd
clz len, synd
lsr len, len, 2
.p2align 4
L(less16):
tbz len, 3, L(less8)
sub tmp, len, 7
ldr data1, [srcin]
ldr data2, [srcin, tmp]
str data1, [dstin]
str data2, [dstin, tmp]
IFSTPCPY (add result, dstin, len)
ret
.p2align 4
L(less8):
subs tmp, len, 3
b.lo L(less4)
ldr dataw1, [srcin]
ldr dataw2, [srcin, tmp]
str dataw1, [dstin]
str dataw2, [dstin, tmp]
IFSTPCPY (add result, dstin, len)
ret
L(less4):
cbz len, L(zerobyte)
ldrh dataw1, [srcin]
strh dataw1, [dstin]
L(zerobyte):
strb wzr, [dstin, len]
IFSTPCPY (add result, dstin, len)
ret
.p2align 4
L(start_loop):
sub len, src, srcin
ldr dataq2, [srcin]
add dst, dstin, len
str dataq2, [dstin]
.p2align 5
L(loop):
str dataq, [dst], 16
ldr dataq, [src, 16]!
cmeq vhas_nul.16b, vdata.16b, 0
umaxp vend.16b, vhas_nul.16b, vhas_nul.16b
fmov synd, dend
cbz synd, L(loop)
and vhas_nul.16b, vhas_nul.16b, vrepmask.16b
addp vend.16b, vhas_nul.16b, vhas_nul.16b /* 128->64 */
fmov synd, dend
#ifndef __AARCH64EB__
rbit synd, synd
#endif
clz len, synd
lsr len, len, 2
sub tmp, len, 15
ldr dataq, [src, tmp]
str dataq, [dst, tmp]
IFSTPCPY (add result, dst, len)
ret
END (STRCPY)
#ifdef BUILD_STPCPY
weak_alias (__stpcpy, stpcpy)
libc_hidden_def (__stpcpy)
libc_hidden_builtin_def (stpcpy)
#else
libc_hidden_builtin_def (strcpy)
#endif
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