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From 3ee56bbc56faa7b85a6513340db4a4fdd6ce709d Mon Sep 17 00:00:00 2001
From: dengjianbo <dengjianbo@loongson.cn>
Date: Mon, 28 Aug 2023 10:08:36 +0800
Subject: [PATCH 15/29] LoongArch: Add ifunc support for memchr{aligned, lsx,
lasx}
According to glibc memchr microbenchmark, this implementation could reduce
the runtime as following:
Name Percent of runtime reduced
memchr-lasx 37%-83%
memchr-lsx 30%-66%
memchr-aligned 0%-15%
Signed-off-by: Peng Fan <fanpeng@loongson.cn>
Signed-off-by: ticat_fp <fanpeng@loongson.cn>
---
sysdeps/loongarch/lp64/multiarch/Makefile | 3 +
.../lp64/multiarch/ifunc-impl-list.c | 7 ++
.../loongarch/lp64/multiarch/ifunc-memchr.h | 40 ++++++
.../loongarch/lp64/multiarch/memchr-aligned.S | 95 ++++++++++++++
.../loongarch/lp64/multiarch/memchr-lasx.S | 117 ++++++++++++++++++
sysdeps/loongarch/lp64/multiarch/memchr-lsx.S | 102 +++++++++++++++
sysdeps/loongarch/lp64/multiarch/memchr.c | 37 ++++++
7 files changed, 401 insertions(+)
create mode 100644 sysdeps/loongarch/lp64/multiarch/ifunc-memchr.h
create mode 100644 sysdeps/loongarch/lp64/multiarch/memchr-aligned.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/memchr-lasx.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/memchr-lsx.S
create mode 100644 sysdeps/loongarch/lp64/multiarch/memchr.c
diff --git a/sysdeps/loongarch/lp64/multiarch/Makefile b/sysdeps/loongarch/lp64/multiarch/Makefile
index 64416b02..2f4802cf 100644
--- a/sysdeps/loongarch/lp64/multiarch/Makefile
+++ b/sysdeps/loongarch/lp64/multiarch/Makefile
@@ -24,5 +24,8 @@ sysdep_routines += \
rawmemchr-aligned \
rawmemchr-lsx \
rawmemchr-lasx \
+ memchr-aligned \
+ memchr-lsx \
+ memchr-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 3db9af14..a567b9cf 100644
--- a/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
@@ -102,5 +102,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_IMPL_ADD (array, i, rawmemchr, 1, __rawmemchr_aligned)
)
+ IFUNC_IMPL (i, name, memchr,
+#if !defined __loongarch_soft_float
+ IFUNC_IMPL_ADD (array, i, memchr, SUPPORT_LASX, __memchr_lasx)
+ IFUNC_IMPL_ADD (array, i, memchr, SUPPORT_LSX, __memchr_lsx)
+#endif
+ IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_aligned)
+ )
return i;
}
diff --git a/sysdeps/loongarch/lp64/multiarch/ifunc-memchr.h b/sysdeps/loongarch/lp64/multiarch/ifunc-memchr.h
new file mode 100644
index 00000000..9060ccd5
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-memchr.h
@@ -0,0 +1,40 @@
+/* Common definition for memchr 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/memchr-aligned.S b/sysdeps/loongarch/lp64/multiarch/memchr-aligned.S
new file mode 100644
index 00000000..81d0d004
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/memchr-aligned.S
@@ -0,0 +1,95 @@
+/* Optimized memchr 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 MEMCHR_NAME __memchr_aligned
+#else
+# define MEMCHR_NAME memchr
+#endif
+
+LEAF(MEMCHR_NAME, 6)
+ beqz a2, L(out)
+ andi t1, a0, 0x7
+ add.d a5, a0, a2
+ bstrins.d a0, zero, 2, 0
+
+ ld.d t0, a0, 0
+ bstrins.d a1, a1, 15, 8
+ lu12i.w a3, 0x01010
+ slli.d t2, t1, 03
+
+ bstrins.d a1, a1, 31, 16
+ ori a3, a3, 0x101
+ li.d t7, -1
+ li.d t8, 8
+
+ bstrins.d a1, a1, 63, 32
+ bstrins.d a3, a3, 63, 32
+ sll.d t2, t7, t2
+ xor t0, t0, a1
+
+
+ addi.d a6, a5, -1
+ slli.d a4, a3, 7
+ sub.d t1, t8, t1
+ orn t0, t0, t2
+
+ sub.d t2, t0, a3
+ andn t3, a4, t0
+ bstrins.d a6, zero, 2, 0
+ and t0, t2, t3
+
+ bgeu t1, a2, L(end)
+L(loop):
+ bnez t0, L(found)
+ ld.d t1, a0, 8
+ xor t0, t1, a1
+
+ addi.d a0, a0, 8
+ sub.d t2, t0, a3
+ andn t3, a4, t0
+ and t0, t2, t3
+
+
+ bne a0, a6, L(loop)
+L(end):
+ sub.d t1, a5, a6
+ ctz.d t0, t0
+ srli.d t0, t0, 3
+
+ sltu t1, t0, t1
+ add.d a0, a0, t0
+ maskeqz a0, a0, t1
+ jr ra
+
+L(found):
+ ctz.d t0, t0
+ srli.d t0, t0, 3
+ add.d a0, a0, t0
+ jr ra
+
+L(out):
+ move a0, zero
+ jr ra
+END(MEMCHR_NAME)
+
+libc_hidden_builtin_def (MEMCHR_NAME)
diff --git a/sysdeps/loongarch/lp64/multiarch/memchr-lasx.S b/sysdeps/loongarch/lp64/multiarch/memchr-lasx.S
new file mode 100644
index 00000000..a26cdf48
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/memchr-lasx.S
@@ -0,0 +1,117 @@
+/* Optimized memchr implementation using LoongArch LASX 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 MEMCHR __memchr_lasx
+
+LEAF(MEMCHR, 6)
+ beqz a2, L(ret0)
+ add.d a3, a0, a2
+ andi t0, a0, 0x3f
+ bstrins.d a0, zero, 5, 0
+
+ xvld xr0, a0, 0
+ xvld xr1, a0, 32
+ li.d t1, -1
+ li.d t2, 64
+
+ xvreplgr2vr.b xr2, a1
+ sll.d t3, t1, t0
+ sub.d t2, t2, t0
+ xvseq.b xr0, xr0, xr2
+
+ xvseq.b xr1, xr1, xr2
+ xvmsknz.b xr0, xr0
+ xvmsknz.b xr1, xr1
+ xvpickve.w xr3, xr0, 4
+
+
+ xvpickve.w xr4, xr1, 4
+ vilvl.h vr0, vr3, vr0
+ vilvl.h vr1, vr4, vr1
+ vilvl.w vr0, vr1, vr0
+
+ movfr2gr.d t0, fa0
+ and t0, t0, t3
+ bgeu t2, a2, L(end)
+ bnez t0, L(found)
+
+ addi.d a4, a3, -1
+ bstrins.d a4, zero, 5, 0
+L(loop):
+ xvld xr0, a0, 64
+ xvld xr1, a0, 96
+
+ addi.d a0, a0, 64
+ xvseq.b xr0, xr0, xr2
+ xvseq.b xr1, xr1, xr2
+ beq a0, a4, L(out)
+
+
+ xvmax.bu xr3, xr0, xr1
+ xvseteqz.v fcc0, xr3
+ bcnez fcc0, L(loop)
+ xvmsknz.b xr0, xr0
+
+ xvmsknz.b xr1, xr1
+ xvpickve.w xr3, xr0, 4
+ xvpickve.w xr4, xr1, 4
+ vilvl.h vr0, vr3, vr0
+
+ vilvl.h vr1, vr4, vr1
+ vilvl.w vr0, vr1, vr0
+ movfr2gr.d t0, fa0
+L(found):
+ ctz.d t1, t0
+
+ add.d a0, a0, t1
+ jr ra
+L(ret0):
+ move a0, zero
+ jr ra
+
+
+L(out):
+ xvmsknz.b xr0, xr0
+ xvmsknz.b xr1, xr1
+ xvpickve.w xr3, xr0, 4
+ xvpickve.w xr4, xr1, 4
+
+ vilvl.h vr0, vr3, vr0
+ vilvl.h vr1, vr4, vr1
+ vilvl.w vr0, vr1, vr0
+ movfr2gr.d t0, fa0
+
+L(end):
+ sub.d t2, zero, a3
+ srl.d t1, t1, t2
+ and t0, t0, t1
+ ctz.d t1, t0
+
+ add.d a0, a0, t1
+ maskeqz a0, a0, t0
+ jr ra
+END(MEMCHR)
+
+libc_hidden_builtin_def (MEMCHR)
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/memchr-lsx.S b/sysdeps/loongarch/lp64/multiarch/memchr-lsx.S
new file mode 100644
index 00000000..a73ecd25
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/memchr-lsx.S
@@ -0,0 +1,102 @@
+/* Optimized memchr 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 MEMCHR __memchr_lsx
+
+LEAF(MEMCHR, 6)
+ beqz a2, L(ret0)
+ add.d a3, a0, a2
+ andi t0, a0, 0x1f
+ bstrins.d a0, zero, 4, 0
+
+ vld vr0, a0, 0
+ vld vr1, a0, 16
+ li.d t1, -1
+ li.d t2, 32
+
+ vreplgr2vr.b vr2, a1
+ sll.d t3, t1, t0
+ sub.d t2, t2, t0
+ vseq.b vr0, vr0, vr2
+
+ vseq.b vr1, vr1, vr2
+ vmsknz.b vr0, vr0
+ vmsknz.b vr1, vr1
+ vilvl.h vr0, vr1, vr0
+
+
+ movfr2gr.s t0, fa0
+ and t0, t0, t3
+ bgeu t2, a2, L(end)
+ bnez t0, L(found)
+
+ addi.d a4, a3, -1
+ bstrins.d a4, zero, 4, 0
+L(loop):
+ vld vr0, a0, 32
+ vld vr1, a0, 48
+
+ addi.d a0, a0, 32
+ vseq.b vr0, vr0, vr2
+ vseq.b vr1, vr1, vr2
+ beq a0, a4, L(out)
+
+ vmax.bu vr3, vr0, vr1
+ vseteqz.v fcc0, vr3
+ bcnez fcc0, L(loop)
+ vmsknz.b vr0, vr0
+
+
+ vmsknz.b vr1, vr1
+ vilvl.h vr0, vr1, vr0
+ movfr2gr.s t0, fa0
+L(found):
+ ctz.w t0, t0
+
+ add.d a0, a0, t0
+ jr ra
+L(ret0):
+ move a0, zero
+ jr ra
+
+L(out):
+ vmsknz.b vr0, vr0
+ vmsknz.b vr1, vr1
+ vilvl.h vr0, vr1, vr0
+ movfr2gr.s t0, fa0
+
+L(end):
+ sub.d t2, zero, a3
+ srl.w t1, t1, t2
+ and t0, t0, t1
+ ctz.w t1, t0
+
+
+ add.d a0, a0, t1
+ maskeqz a0, a0, t0
+ jr ra
+END(MEMCHR)
+
+libc_hidden_builtin_def (MEMCHR)
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/memchr.c b/sysdeps/loongarch/lp64/multiarch/memchr.c
new file mode 100644
index 00000000..059479c0
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/memchr.c
@@ -0,0 +1,37 @@
+/* Multiple versions of memchr.
+ 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 memchr __redirect_memchr
+# include <string.h>
+# undef memchr
+
+# define SYMBOL_NAME memchr
+# include "ifunc-memchr.h"
+
+libc_ifunc_redirected (__redirect_memchr, memchr,
+ IFUNC_SELECTOR ());
+
+# ifdef SHARED
+__hidden_ver1 (memchr, __GI_memchr, __redirect_memchr)
+ __attribute__ ((visibility ("hidden"))) __attribute_copy__ (memchr);
+# endif
+
+#endif
--
2.33.0
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