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LoongArch: Add ifunc support for strcmp{aligned, lsx}

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Based on the glibc microbenchmark, strcmp-aligned implementation could
reduce the runtime 0%-10% for aligned comparison, 10%-20% for unaligned
comparison, strcmp-lsx implemenation could reduce the runtime 0%-50%.
This commit is contained in:
dengjianbo 2023-08-24 16:50:18 +08:00 • committed by caiyinyu
parent e74d959862
commit 82d9426e4a
6 changed files with 426 additions and 0 deletions
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2
sysdeps/loongarch/lp64/multiarch/Makefile
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@ -12,6 +12,8 @@ sysdep_routines += \
strchrnul-aligned \ strchrnul-aligned \
strchrnul-lsx \ strchrnul-lsx \
strchrnul-lasx \ strchrnul-lasx \
strcmp-aligned \
strcmp-lsx \
memcpy-aligned \ memcpy-aligned \
memcpy-unaligned \ memcpy-unaligned \
memmove-unaligned \ memmove-unaligned \

7
sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
View file

@ -62,6 +62,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_IMPL_ADD (array, i, strchrnul, 1, __strchrnul_aligned) IFUNC_IMPL_ADD (array, i, strchrnul, 1, __strchrnul_aligned)
) )
IFUNC_IMPL (i, name, strcmp,
#if !defined __loongarch_soft_float
IFUNC_IMPL_ADD (array, i, strcmp, SUPPORT_LSX, __strcmp_lsx)
#endif
IFUNC_IMPL_ADD (array, i, strcmp, 1, __strcmp_aligned)
)
IFUNC_IMPL (i, name, memcpy, IFUNC_IMPL (i, name, memcpy,
#if !defined __loongarch_soft_float #if !defined __loongarch_soft_float
IFUNC_IMPL_ADD (array, i, memcpy, SUPPORT_LASX, __memcpy_lasx) IFUNC_IMPL_ADD (array, i, memcpy, SUPPORT_LASX, __memcpy_lasx)

38
sysdeps/loongarch/lp64/multiarch/ifunc-strcmp.h Normal file
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@ -0,0 +1,38 @@
/* Common definition for strcmp ifunc selection.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2023 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 <ldsodefs.h>
#include <ifunc-init.h>
#if !defined __loongarch_soft_float
extern __typeof (REDIRECT_NAME) OPTIMIZE (lsx) attribute_hidden;
#endif
extern __typeof (REDIRECT_NAME) OPTIMIZE (aligned) attribute_hidden;
static inline void *
IFUNC_SELECTOR (void)
{
#if !defined __loongarch_soft_float
if (SUPPORT_LSX)
return OPTIMIZE (lsx);
else
#endif
return OPTIMIZE (aligned);
}

179
sysdeps/loongarch/lp64/multiarch/strcmp-aligned.S Normal file
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@ -0,0 +1,179 @@
/* Optimized strcmp implementation using basic Loongarch instructions.
Copyright (C) 2023 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>
#include <sys/regdef.h>
#include <sys/asm.h>
#if IS_IN (libc)
# define STRCMP_NAME __strcmp_aligned
#else
# define STRCMP_NAME strcmp
#endif
LEAF(STRCMP_NAME, 6)
lu12i.w a4, 0x01010
andi a2, a0, 0x7
ori a4, a4, 0x101
andi a3, a1, 0x7
bstrins.d a4, a4, 63, 32
li.d t7, -1
li.d t8, 8
slli.d a5, a4, 7
bne a2, a3, L(unaligned)
bstrins.d a0, zero, 2, 0
bstrins.d a1, zero, 2, 0
ld.d t0, a0, 0
ld.d t1, a1, 0
slli.d t3, a2, 3
sll.d t2, t7, t3
orn t0, t0, t2
orn t1, t1, t2
sub.d t2, t0, a4
andn t3, a5, t0
and t2, t2, t3
bne t0, t1, L(al_end)
L(al_loop):
bnez t2, L(ret0)
ldx.d t0, a0, t8
ldx.d t1, a1, t8
addi.d t8, t8, 8
sub.d t2, t0, a4
andn t3, a5, t0
and t2, t2, t3
beq t0, t1, L(al_loop)
L(al_end):
xor t3, t0, t1
or t2, t2, t3
ctz.d t3, t2
bstrins.d t3, zero, 2, 0
srl.d t0, t0, t3
srl.d t1, t1, t3
andi t0, t0, 0xff
andi t1, t1, 0xff
sub.d a0, t0, t1
jr ra
nop
L(ret0):
move a0, zero
jr ra
nop
nop
L(unaligned):
slt a6, a3, a2
xor t0, a0, a1
maskeqz t0, t0, a6
xor a0, a0, t0
xor a1, a1, t0
andi a2, a0, 0x7
andi a3, a1, 0x7
bstrins.d a0, zero, 2, 0
bstrins.d a1, zero, 2, 0
ld.d t4, a0, 0
ld.d t1, a1, 0
slli.d a2, a2, 3
slli.d a3, a3, 3
srl.d t0, t4, a2
srl.d t1, t1, a3
srl.d t5, t7, a3
orn t0, t0, t5
orn t1, t1, t5
bne t0, t1, L(not_equal)
sll.d t5, t7, a2
sub.d a3, a2, a3
orn t4, t4, t5
sub.d a2, zero, a3
sub.d t2, t4, a4
andn t3, a5, t4
and t2, t2, t3
bnez t2, L(find_zero)
L(un_loop):
srl.d t5, t4, a3
ldx.d t4, a0, t8
ldx.d t1, a1, t8
addi.d t8, t8, 8
sll.d t0, t4, a2
or t0, t0, t5
bne t0, t1, L(not_equal)
sub.d t2, t4, a4
andn t3, a5, t4
and t2, t2, t3
beqz t2, L(un_loop)
L(find_zero):
sub.d t2, t0, a4
andn t3, a5, t0
and t2, t2, t3
bnez t2, L(ret0)
ldx.d t1, a1, t8
srl.d t0, t4, a3
L(not_equal):
sub.d t2, t0, a4
andn t3, a5, t0
and t2, t2, t3
xor t3, t0, t1
or t2, t2, t3
L(un_end):
ctz.d t3, t2
bstrins.d t3, zero, 2, 0
srl.d t0, t0, t3
srl.d t1, t1, t3
andi t0, t0, 0xff
andi t1, t1, 0xff
sub.d t2, t0, t1
sub.d t3, t1, t0
masknez t0, t2, a6
maskeqz t1, t3, a6
or a0, t0, t1
jr ra
END(STRCMP_NAME)
libc_hidden_builtin_def (STRCMP_NAME)

165
sysdeps/loongarch/lp64/multiarch/strcmp-lsx.S Normal file
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@ -0,0 +1,165 @@
/* Optimized strcmp implementation using Loongarch LSX instructions.
Copyright (C) 2023 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>
#include <sys/regdef.h>
#include <sys/asm.h>
#if IS_IN (libc) && !defined __loongarch_soft_float
# define STRCMP __strcmp_lsx
LEAF(STRCMP, 6)
pcalau12i t0, %pc_hi20(L(INDEX))
andi a2, a0, 0xf
vld vr2, t0, %pc_lo12(L(INDEX))
andi a3, a1, 0xf
bne a2, a3, L(unaligned)
bstrins.d a0, zero, 3, 0
bstrins.d a1, zero, 3, 0
vld vr0, a0, 0
vld vr1, a1, 0
vreplgr2vr.b vr3, a2
vslt.b vr2, vr2, vr3
vseq.b vr3, vr0, vr1
vmin.bu vr3, vr0, vr3
vor.v vr3, vr3, vr2
vsetanyeqz.b fcc0, vr3
bcnez fcc0, L(al_out)
L(al_loop):
vld vr0, a0, 16
vld vr1, a1, 16
addi.d a0, a0, 16
addi.d a1, a1, 16
vseq.b vr3, vr0, vr1
vmin.bu vr3, vr0, vr3
vsetanyeqz.b fcc0, vr3
bceqz fcc0, L(al_loop)
L(al_out):
vseqi.b vr3, vr3, 0
vfrstpi.b vr3, vr3, 0
vshuf.b vr0, vr0, vr0, vr3
vshuf.b vr1, vr1, vr1, vr3
vpickve2gr.bu t0, vr0, 0
vpickve2gr.bu t1, vr1, 0
sub.d a0, t0, t1
jr ra
L(unaligned):
slt a4, a3, a2
xor t0, a0, a1
maskeqz t0, t0, a4
xor a0, a0, t0
xor a1, a1, t0
andi a2, a0, 0xf
andi a3, a1, 0xf
bstrins.d a0, zero, 3, 0
bstrins.d a1, zero, 3, 0
vld vr3, a0, 0
vld vr1, a1, 0
vreplgr2vr.b vr4, a2
vreplgr2vr.b vr5, a3
vslt.b vr7, vr2, vr5
vsub.b vr5, vr5, vr4
vaddi.bu vr6, vr2, 16
vsub.b vr6, vr6, vr5
vshuf.b vr0, vr3, vr3, vr6
vor.v vr0, vr0, vr7
vor.v vr1, vr1, vr7
vseq.b vr5, vr0, vr1
vsetanyeqz.b fcc0, vr5
bcnez fcc0, L(not_equal)
vslt.b vr4, vr2, vr4
vor.v vr0, vr3, vr4
vsetanyeqz.b fcc0, vr0
bcnez fcc0, L(find_zero)
nop
L(un_loop):
vld vr3, a0, 16
vld vr1, a1, 16
addi.d a0, a0, 16
addi.d a1, a1, 16
vshuf.b vr0, vr3, vr0, vr6
vseq.b vr5, vr0, vr1
vsetanyeqz.b fcc0, vr5
bcnez fcc0, L(not_equal)
vsetanyeqz.b fcc0, vr3
vor.v vr0, vr3, vr3
bceqz fcc0, L(un_loop)
L(find_zero):
vmin.bu vr5, vr1, vr5
vsetanyeqz.b fcc0, vr5
bcnez fcc0, L(ret0)
vld vr1, a1, 16
vshuf.b vr0, vr3, vr3, vr6
vseq.b vr5, vr0, vr1
L(not_equal):
vmin.bu vr5, vr0, vr5
L(un_end):
vseqi.b vr5, vr5, 0
vfrstpi.b vr5, vr5, 0
vshuf.b vr0, vr0, vr0, vr5
vshuf.b vr1, vr1, vr1, vr5
vpickve2gr.bu t0, vr0, 0
vpickve2gr.bu t1, vr1, 0
sub.d t3, t0, t1
sub.d t4, t1, t0
masknez t0, t3, a4
maskeqz t1, t4, a4
or a0, t0, t1
jr ra
L(ret0):
move a0, zero
jr ra
END(STRCMP)
.section .rodata.cst16,"M",@progbits,16
.align 4
L(INDEX):
.dword 0x0706050403020100
.dword 0x0f0e0d0c0b0a0908
libc_hidden_builtin_def (STRCMP)
#endif

35
sysdeps/loongarch/lp64/multiarch/strcmp.c Normal file
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@ -0,0 +1,35 @@
/* Multiple versions of strcmp.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2023 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
<http://www.gnu.org/licenses/>. */
/* Define multiple versions only for the definition in libc. */
#if IS_IN (libc)
# define strcmp __redirect_strcmp
# include <string.h>
# undef strcmp
# define SYMBOL_NAME strcmp
# include "ifunc-strcmp.h"
libc_ifunc_redirected (__redirect_strcmp, strcmp, IFUNC_SELECTOR ());
# ifdef SHARED
__hidden_ver1 (strcmp, __GI_strcmp, __redirect_strcmp)
__attribute__ ((visibility ("hidden"))) __attribute_copy__ (strcmp);
# endif
#endif