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anolis-glibc/Loongarch-Add-ifunc-support-for-strchr-aligned-lsx-l.patch
ticat_fp 62fe06b740 LoongArch: Sync from glibc upstream 
Signed-off-by: ticat_fp <fanpeng@loongson.cn>
2024-03-18 14:24:33 +08:00

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From aca7d7f0dde5f56344e8e58e5f6648c96bb1f1cc Mon Sep 17 00:00:00 2001
From: dengjianbo <dengjianbo@loongson.cn>
Date: Tue, 15 Aug 2023 09:08:11 +0800
Subject: [PATCH 06/29] Loongarch: Add ifunc support for strchr{aligned, lsx,
lasx} and strchrnul{aligned, lsx, lasx}
These implementations improve the time to run strchr{nul}
microbenchmark in glibc as below:
strchr-lasx reduces the runtime about 50%-83%
strchr-lsx reduces the runtime about 30%-67%
strchr-aligned reduces the runtime about 10%-20%
strchrnul-lasx reduces the runtime about 50%-83%
strchrnul-lsx reduces the runtime about 36%-65%
strchrnul-aligned reduces the runtime about 6%-10%
Signed-off-by: Peng Fan <fanpeng@loongson.cn>
Signed-off-by: ticat_fp <fanpeng@loongson.cn>
---
sysdeps/loongarch/lp64/multiarch/Makefile | 6 ++
.../lp64/multiarch/ifunc-impl-list.c | 16 +++
.../loongarch/lp64/multiarch/ifunc-strchr.h | 41 ++++++++
.../lp64/multiarch/ifunc-strchrnul.h | 41 ++++++++
.../loongarch/lp64/multiarch/strchr-aligned.S | 99 +++++++++++++++++++
.../loongarch/lp64/multiarch/strchr-lasx.S | 91 +++++++++++++++++
sysdeps/loongarch/lp64/multiarch/strchr-lsx.S | 73 ++++++++++++++
sysdeps/loongarch/lp64/multiarch/strchr.c | 36 +++++++
.../lp64/multiarch/strchrnul-aligned.S | 95 ++++++++++++++++++
.../loongarch/lp64/multiarch/strchrnul-lasx.S | 22 +++++
.../loongarch/lp64/multiarch/strchrnul-lsx.S | 22 +++++
sysdeps/loongarch/lp64/multiarch/strchrnul.c | 39 ++++++++
12 files changed, 581 insertions(+)
create mode 100644 sysdeps/loongarch/lp64/multiarch/ifunc-strchr.h
create mode 100644 sysdeps/loongarch/lp64/multiarch/ifunc-strchrnul.h
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchr-aligned.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchr-lasx.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchr-lsx.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchr.c
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchrnul-aligned.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchrnul-lasx.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchrnul-lsx.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/strchrnul.c
diff --git a/sysdeps/loongarch/lp64/multiarch/Makefile b/sysdeps/loongarch/lp64/multiarch/Makefile
index 76c506c9..110a8c5c 100644
--- a/sysdeps/loongarch/lp64/multiarch/Makefile
+++ b/sysdeps/loongarch/lp64/multiarch/Makefile
@@ -3,5 +3,11 @@ sysdep_routines += \
strlen-aligned \
strlen-lsx \
strlen-lasx \
+ strchr-aligned \
+ strchr-lsx \
+ strchr-lasx \
+ strchrnul-aligned \
+ strchrnul-lsx \
+ strchrnul-lasx \
# sysdep_routines
endif
diff --git a/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c b/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
index 1a2a576f..c7164b45 100644
--- a/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
@@ -37,5 +37,21 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
#endif
IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_aligned)
)
+
+ IFUNC_IMPL (i, name, strchr,
+#if !defined __loongarch_soft_float
+ IFUNC_IMPL_ADD (array, i, strchr, SUPPORT_LASX, __strchr_lasx)
+ IFUNC_IMPL_ADD (array, i, strchr, SUPPORT_LSX, __strchr_lsx)
+#endif
+ IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_aligned)
+ )
+
+ IFUNC_IMPL (i, name, strchrnul,
+#if !defined __loongarch_soft_float
+ IFUNC_IMPL_ADD (array, i, strchrnul, SUPPORT_LASX, __strchrnul_lasx)
+ IFUNC_IMPL_ADD (array, i, strchrnul, SUPPORT_LSX, __strchrnul_lsx)
+#endif
+ IFUNC_IMPL_ADD (array, i, strchrnul, 1, __strchrnul_aligned)
+ )
return i;
}
diff --git a/sysdeps/loongarch/lp64/multiarch/ifunc-strchr.h b/sysdeps/loongarch/lp64/multiarch/ifunc-strchr.h
new file mode 100644
index 00000000..4494db79
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-strchr.h
@@ -0,0 +1,41 @@
+/* Common definition for strchr ifunc selections.
+ 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 (lasx) attribute_hidden;
+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_LASX)
+ return OPTIMIZE (lasx);
+ else if (SUPPORT_LSX)
+ return OPTIMIZE (lsx);
+ else
+#endif
+ return OPTIMIZE (aligned);
+}
diff --git a/sysdeps/loongarch/lp64/multiarch/ifunc-strchrnul.h b/sysdeps/loongarch/lp64/multiarch/ifunc-strchrnul.h
new file mode 100644
index 00000000..8a925120
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-strchrnul.h
@@ -0,0 +1,41 @@
+/* Common definition for strchrnul ifunc selections.
+ 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 (lasx) attribute_hidden;
+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_LASX)
+ return OPTIMIZE (lasx);
+ else if (SUPPORT_LSX)
+ return OPTIMIZE (lsx);
+ else
+#endif
+ return OPTIMIZE (aligned);
+}
diff --git a/sysdeps/loongarch/lp64/multiarch/strchr-aligned.S b/sysdeps/loongarch/lp64/multiarch/strchr-aligned.S
new file mode 100644
index 00000000..5fb01806
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchr-aligned.S
@@ -0,0 +1,99 @@
+/* Optimized strchr 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 STRCHR_NAME __strchr_aligned
+#else
+# define STRCHR_NAME strchr
+#endif
+
+LEAF(STRCHR_NAME, 6)
+ slli.d t1, a0, 3
+ bstrins.d a0, zero, 2, 0
+ lu12i.w a2, 0x01010
+ ld.d t2, a0, 0
+
+ ori a2, a2, 0x101
+ andi a1, a1, 0xff
+ bstrins.d a2, a2, 63, 32
+ li.w t0, -1
+
+ mul.d a1, a1, a2
+ sll.d t0, t0, t1
+ slli.d a3, a2, 7
+ orn t2, t2, t0
+
+ sll.d t3, a1, t1
+ xor t4, t2, t3
+ sub.d a4, t2, a2
+ sub.d a5, t4, a2
+
+
+ andn a4, a4, t2
+ andn a5, a5, t4
+ or t0, a4, a5
+ and t0, t0, a3
+
+ bnez t0, L(end)
+ addi.d a0, a0, 8
+L(loop):
+ ld.d t4, a0, 0
+ xor t2, t4, a1
+
+ sub.d a4, t4, a2
+ sub.d a5, t2, a2
+ andn a4, a4, t4
+ andn a5, a5, t2
+
+ or t0, a4, a5
+ and t0, t0, a3
+ bnez t0, L(end)
+ ld.d t4, a0, 8
+
+
+ addi.d a0, a0, 16
+ xor t2, t4, a1
+ sub.d a4, t4, a2
+ sub.d a5, t2, a2
+
+ andn a4, a4, t4
+ andn a5, a5, t2
+ or t0, a4, a5
+ and t0, t0, a3
+
+ beqz t0, L(loop)
+ addi.d a0, a0, -8
+L(end):
+ and t0, a5, a3
+ and t1, a4, a3
+
+ ctz.d t0, t0
+ ctz.d t1, t1
+ srli.w t2, t0, 3
+ sltu t3, t1, t0
+
+
+ add.d a0, a0, t2
+ masknez a0, a0, t3
+ jr ra
+END(STRCHR_NAME)
diff --git a/sysdeps/loongarch/lp64/multiarch/strchr-lasx.S b/sysdeps/loongarch/lp64/multiarch/strchr-lasx.S
new file mode 100644
index 00000000..254402da
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchr-lasx.S
@@ -0,0 +1,91 @@
+/* Optimized strchr implementation using loongarch LASX SIMD 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
+
+#ifndef AS_STRCHRNUL
+# define STRCHR __strchr_lasx
+#endif
+
+LEAF(STRCHR, 6)
+ andi t1, a0, 0x1f
+ bstrins.d a0, zero, 4, 0
+ xvld xr0, a0, 0
+ li.d t2, -1
+
+ xvreplgr2vr.b xr1, a1
+ sll.d t1, t2, t1
+ xvxor.v xr2, xr0, xr1
+ xvmin.bu xr0, xr0, xr2
+
+ xvmsknz.b xr0, xr0
+ xvpickve.w xr3, xr0, 4
+ vilvl.h vr0, vr3, vr0
+ movfr2gr.s t0, fa0
+
+ orn t0, t0, t1
+ bne t0, t2, L(end)
+ addi.d a0, a0, 32
+ nop
+
+
+L(loop):
+ xvld xr0, a0, 0
+ xvxor.v xr2, xr0, xr1
+ xvmin.bu xr0, xr0, xr2
+ xvsetanyeqz.b fcc0, xr0
+
+ bcnez fcc0, L(loop_end)
+ xvld xr0, a0, 32
+ addi.d a0, a0, 64
+ xvxor.v xr2, xr0, xr1
+
+ xvmin.bu xr0, xr0, xr2
+ xvsetanyeqz.b fcc0, xr0
+ bceqz fcc0, L(loop)
+ addi.d a0, a0, -32
+
+L(loop_end):
+ xvmsknz.b xr0, xr0
+ xvpickve.w xr1, xr0, 4
+ vilvl.h vr0, vr1, vr0
+ movfr2gr.s t0, fa0
+
+
+L(end):
+ cto.w t0, t0
+ add.d a0, a0, t0
+#ifndef AS_STRCHRNUL
+ vreplgr2vr.b vr0, t0
+ xvpermi.q xr3, xr2, 1
+
+ vshuf.b vr0, vr3, vr2, vr0
+ vpickve2gr.bu t0, vr0, 0
+ masknez a0, a0, t0
+#endif
+ jr ra
+
+END(STRCHR)
+
+libc_hidden_builtin_def(STRCHR)
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/strchr-lsx.S b/sysdeps/loongarch/lp64/multiarch/strchr-lsx.S
new file mode 100644
index 00000000..dae98b0a
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchr-lsx.S
@@ -0,0 +1,73 @@
+/* Optimized strlen implementation using loongarch LSX SIMD 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
+
+#ifndef AS_STRCHRNUL
+# define STRCHR __strchr_lsx
+#endif
+
+LEAF(STRCHR, 6)
+ andi t1, a0, 0xf
+ bstrins.d a0, zero, 3, 0
+ vld vr0, a0, 0
+ li.d t2, -1
+
+ vreplgr2vr.b vr1, a1
+ sll.d t3, t2, t1
+ vxor.v vr2, vr0, vr1
+ vmin.bu vr0, vr0, vr2
+
+ vmsknz.b vr0, vr0
+ movfr2gr.s t0, fa0
+ ext.w.h t0, t0
+ orn t0, t0, t3
+
+ beq t0, t2, L(loop)
+L(found):
+ cto.w t0, t0
+ add.d a0, a0, t0
+#ifndef AS_STRCHRNUL
+ vreplve.b vr2, vr2, t0
+ vpickve2gr.bu t1, vr2, 0
+ masknez a0, a0, t1
+#endif
+ jr ra
+
+
+L(loop):
+ vld vr0, a0, 16
+ addi.d a0, a0, 16
+ vxor.v vr2, vr0, vr1
+ vmin.bu vr0, vr0, vr2
+
+ vsetanyeqz.b fcc0, vr0
+ bceqz fcc0, L(loop)
+ vmsknz.b vr0, vr0
+ movfr2gr.s t0, fa0
+
+ b L(found)
+END(STRCHR)
+
+libc_hidden_builtin_def (STRCHR)
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/strchr.c b/sysdeps/loongarch/lp64/multiarch/strchr.c
new file mode 100644
index 00000000..404e97bd
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchr.c
@@ -0,0 +1,36 @@
+/* Multiple versions of strchr.
+ 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/>. */
+
+/* Define multiple versions only for the definition in libc. */
+#if IS_IN (libc)
+# define strchr __redirect_strchr
+# include <string.h>
+# undef strchr
+
+# define SYMBOL_NAME strchr
+# include "ifunc-strchr.h"
+
+libc_ifunc_redirected (__redirect_strchr, strchr, IFUNC_SELECTOR ());
+weak_alias(strchr, index)
+# ifdef SHARED
+__hidden_ver1 (strchr, __GI_strchr, __redirect_strchr)
+ __attribute__ ((visibility ("hidden"))) __attribute_copy__ (strchr);
+# endif
+
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/strchrnul-aligned.S b/sysdeps/loongarch/lp64/multiarch/strchrnul-aligned.S
new file mode 100644
index 00000000..1c01a023
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchrnul-aligned.S
@@ -0,0 +1,95 @@
+/* Optimized strchrnul 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 STRCHRNUL_NAME __strchrnul_aligned
+#else
+# define STRCHRNUL_NAME __strchrnul
+#endif
+
+LEAF(STRCHRNUL_NAME, 6)
+ slli.d t1, a0, 3
+ bstrins.d a0, zero, 2, 0
+ lu12i.w a2, 0x01010
+ ld.d t2, a0, 0
+
+ ori a2, a2, 0x101
+ andi a1, a1, 0xff
+ bstrins.d a2, a2, 63, 32
+ li.w t0, -1
+
+ mul.d a1, a1, a2
+ sll.d t0, t0, t1
+ slli.d a3, a2, 7
+ orn t2, t2, t0
+
+ sll.d t3, a1, t1
+ xor t4, t2, t3
+ sub.d a4, t2, a2
+ sub.d a5, t4, a2
+
+
+ andn a4, a4, t2
+ andn a5, a5, t4
+ or t0, a4, a5
+ and t0, t0, a3
+
+ bnez t0, L(end)
+ addi.d a0, a0, 8
+L(loop):
+ ld.d t4, a0, 0
+ xor t2, t4, a1
+
+ sub.d a4, t4, a2
+ sub.d a5, t2, a2
+ andn a4, a4, t4
+ andn a5, a5, t2
+
+ or t0, a4, a5
+ and t0, t0, a3
+ bnez t0, L(end)
+ ld.d t4, a0, 8
+
+
+ addi.d a0, a0, 16
+ xor t2, t4, a1
+ sub.d a4, t4, a2
+ sub.d a5, t2, a2
+
+ andn a4, a4, t4
+ andn a5, a5, t2
+ or t0, a4, a5
+ and t0, t0, a3
+
+ beqz t0, L(loop)
+ addi.d a0, a0, -8
+L(end):
+ ctz.d t0, t0
+ srli.w t0, t0, 3
+
+
+ add.d a0, a0, t0
+ jr ra
+END(STRCHRNUL_NAME)
+
+libc_hidden_builtin_def (STRCHRNUL_NAME)
diff --git a/sysdeps/loongarch/lp64/multiarch/strchrnul-lasx.S b/sysdeps/loongarch/lp64/multiarch/strchrnul-lasx.S
new file mode 100644
index 00000000..d45495e4
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchrnul-lasx.S
@@ -0,0 +1,22 @@
+/* Optimized strchrnul implementation using loongarch LASX SIMD 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/>. */
+
+#define STRCHR __strchrnul_lasx
+#define AS_STRCHRNUL
+#include "strchr-lasx.S"
diff --git a/sysdeps/loongarch/lp64/multiarch/strchrnul-lsx.S b/sysdeps/loongarch/lp64/multiarch/strchrnul-lsx.S
new file mode 100644
index 00000000..07d793ae
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchrnul-lsx.S
@@ -0,0 +1,22 @@
+/* Optimized strchrnul implementation using loongarch LSX SIMD 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/>. */
+
+#define STRCHR __strchrnul_lsx
+#define AS_STRCHRNUL
+#include "strchr-lsx.S"
diff --git a/sysdeps/loongarch/lp64/multiarch/strchrnul.c b/sysdeps/loongarch/lp64/multiarch/strchrnul.c
new file mode 100644
index 00000000..f3b8296e
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/strchrnul.c
@@ -0,0 +1,39 @@
+/* Multiple versions of strchrnul.
+ 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 strchrnul __redirect_strchrnul
+# define __strchrnul __redirect___strchrnul
+# include <string.h>
+# undef __strchrnul
+# undef strchrnul
+
+# define SYMBOL_NAME strchrnul
+# include "ifunc-strchrnul.h"
+
+libc_ifunc_redirected (__redirect_strchrnul, __strchrnul,
+ IFUNC_SELECTOR ());
+weak_alias (__strchrnul, strchrnul)
+# ifdef SHARED
+__hidden_ver1 (__strchrnul, __GI___strchrnul, __redirect_strchrnul)
+ __attribute__((visibility ("hidden"))) __attribute_copy__ (strchrnul);
+# endif
+#endif
--
2.33.0
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