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/* Optimized strcpy implementation for PowerPC64/POWER9.
Copyright (C) 2020 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/>. */
#include <sysdep.h>
#ifdef USE_AS_STPCPY
# ifndef STPCPY
# define FUNC_NAME __stpcpy
# else
# define FUNC_NAME STPCPY
# endif
#else
# ifndef STRCPY
# define FUNC_NAME strcpy
# else
# define FUNC_NAME STRCPY
# endif
#endif /* !USE_AS_STPCPY */
/* Implements the function
char * [r3] strcpy (char *dest [r3], const char *src [r4])
or
char * [r3] stpcpy (char *dest [r3], const char *src [r4])
if USE_AS_STPCPY is defined.
The implementation can load bytes past a null terminator, but only
up to the next 16B boundary, so it never crosses a page. */
.machine power9
ENTRY_TOCLESS (FUNC_NAME, 4)
CALL_MCOUNT 2
/* NULL string optimisation */
lbz r0,0(r4)
stb r0,0(r3)
cmpwi r0,0
beqlr
addi r4,r4,1
addi r11,r3,1
vspltisb v18,0 /* Zeroes in v18 */
neg r5,r4
rldicl r9,r5,0,60 /* How many bytes to get source 16B aligned? */
/* Get source 16B aligned */
lvx v0,0,r4
lvsr v1,0,r4
vperm v0,v18,v0,v1
vcmpequb v6,v0,v18 /* 0xff if byte is NULL, 0x00 otherwise */
vctzlsbb r7,v6 /* Number of trailing zeroes */
addi r8,r7,1 /* Add null terminator */
/* r8 = bytes including null
r9 = bytes to get source 16B aligned
if r8 > r9
no null, copy r9 bytes
else
there is a null, copy r8 bytes and return. */
cmpd r8,r9
bgt L(no_null)
sldi r10,r8,56 /* stxvl wants size in top 8 bits */
stxvl 32+v0,r11,r10 /* Partial store */
#ifdef USE_AS_STPCPY
/* stpcpy returns the dest address plus the size not counting the
final '\0'. */
add r3,r11,r7
#endif
blr
L(no_null):
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
stxvl 32+v0,r11,r10 /* Partial store */
add r4,r4,r9
add r11,r11,r9
L(loop):
lxv 32+v0,0(r4)
vcmpequb. v6,v0,v18 /* Any zero bytes? */
bne cr6,L(tail1)
lxv 32+v1,16(r4)
vcmpequb. v6,v1,v18 /* Any zero bytes? */
bne cr6,L(tail2)
lxv 32+v2,32(r4)
vcmpequb. v6,v2,v18 /* Any zero bytes? */
bne cr6,L(tail3)
lxv 32+v3,48(r4)
vcmpequb. v6,v3,v18 /* Any zero bytes? */
bne cr6,L(tail4)
stxv 32+v0,0(r11)
stxv 32+v1,16(r11)
stxv 32+v2,32(r11)
stxv 32+v3,48(r11)
addi r4,r4,64
addi r11,r11,64
b L(loop)
L(tail1):
vctzlsbb r8,v6
addi r9,r8,1
sldi r9,r9,56 /* stxvl wants size in top 8 bits */
stxvl 32+v0,r11,r9
#ifdef USE_AS_STPCPY
/* stpcpy returns the dest address plus the size not counting the
final '\0'. */
add r3,r11,r8
#endif
blr
L(tail2):
stxv 32+v0,0(r11)
vctzlsbb r8,v6 /* Number of trailing zeroes */
addi r9,r8,1 /* Add null terminator */
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
addi r11,r11,16
stxvl 32+v1,r11,r10 /* Partial store */
#ifdef USE_AS_STPCPY
/* stpcpy returns the dest address plus the size not counting the
final '\0'. */
add r3,r11,r8
#endif
blr
L(tail3):
stxv 32+v0,0(r11)
stxv 32+v1,16(r11)
vctzlsbb r8,v6 /* Number of trailing zeroes */
addi r9,r8,1 /* Add null terminator */
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
addi r11,r11,32
stxvl 32+v2,r11,r10 /* Partial store */
#ifdef USE_AS_STPCPY
/* stpcpy returns the dest address plus the size not counting the
final '\0'. */
add r3,r11,r8
#endif
blr
L(tail4):
stxv 32+v0,0(r11)
stxv 32+v1,16(r11)
stxv 32+v2,32(r11)
vctzlsbb r8,v6 /* Number of trailing zeroes */
addi r9,r8,1 /* Add null terminator */
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
addi r11,r11,48
stxvl 32+v3,r11,r10 /* Partial store */
#ifdef USE_AS_STPCPY
/* stpcpy returns the dest address plus the size not counting the
final '\0'. */
add r3,r11,r8
#endif
blr
END (FUNC_NAME)
#ifndef USE_AS_STPCPY
libc_hidden_builtin_def (strcpy)
#endif
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