LoongArch: Add ifunc support for rawmemchr{aligned, lsx, lasx}

According to glibc rawmemchr microbenchmark, A few cases tested with
char '\0' experience performance degradation due to the lasx and lsx
versions don't handle the '\0' separately. Overall, rawmemchr-lasx
implementation could reduce the runtime about 40%-80%, rawmemchr-lsx
implementation could reduce the runtime about 40%-66%, rawmemchr-aligned
implementation could reduce the runtime about 20%-40%.

7 files changed, 365 insertions, 0 deletions

diff --git a/sysdeps/loongarch/lp64/multiarch/Makefile b/sysdeps/loongarch/lp64/multiarch/Makefile
index 5d7ae7ae73..64416b025a 100644
--- a/sysdeps/loongarch/lp64/multiarch/Makefile
+++ b/sysdeps/loongarch/lp64/multiarch/Makefile
@@ -21,5 +21,8 @@ sysdep_routines += \
   memmove-unaligned \
   memmove-lsx \
   memmove-lasx \
+  rawmemchr-aligned \
+  rawmemchr-lsx \
+  rawmemchr-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 c8ba87bd81..3db9af1460 100644
--- a/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-impl-list.c
@@ -94,5 +94,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
               IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_aligned)
               )
 
+  IFUNC_IMPL (i, name, rawmemchr,
+#if !defined __loongarch_soft_float
+	      IFUNC_IMPL_ADD (array, i, rawmemchr, SUPPORT_LASX, __rawmemchr_lasx)
+	      IFUNC_IMPL_ADD (array, i, rawmemchr, SUPPORT_LSX, __rawmemchr_lsx)
+#endif
+	      IFUNC_IMPL_ADD (array, i, rawmemchr, 1, __rawmemchr_aligned)
+	      )
+
   return i;
 }
diff --git a/sysdeps/loongarch/lp64/multiarch/ifunc-rawmemchr.h b/sysdeps/loongarch/lp64/multiarch/ifunc-rawmemchr.h
new file mode 100644
index 0000000000..a7bb4cf9ea
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/ifunc-rawmemchr.h
@@ -0,0 +1,40 @@
+/* Common definition for rawmemchr 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/rawmemchr-aligned.S b/sysdeps/loongarch/lp64/multiarch/rawmemchr-aligned.S
new file mode 100644
index 0000000000..9c7155ae82
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/rawmemchr-aligned.S
@@ -0,0 +1,124 @@
+/* Optimized rawmemchr 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 RAWMEMCHR_NAME __rawmemchr_aligned
+#else
+# define RAWMEMCHR_NAME __rawmemchr
+#endif
+
+LEAF(RAWMEMCHR_NAME, 6)
+    andi        t1, a0, 0x7
+    bstrins.d   a0, zero, 2, 0
+    lu12i.w     a2, 0x01010
+    bstrins.d   a1, a1, 15, 8
+
+    ld.d        t0, a0, 0
+    slli.d      t1, t1, 3
+    ori         a2, a2, 0x101
+    bstrins.d   a1, a1, 31, 16
+
+    li.w        t8, -1
+    bstrins.d   a1, a1, 63, 32
+    bstrins.d   a2, a2, 63, 32
+    sll.d       t2, t8, t1
+
+    sll.d       t3, a1, t1
+    orn         t0, t0, t2
+    slli.d      a3, a2, 7
+    beqz        a1, L(find_zero)
+
+    xor         t0, t0, t3
+    sub.d       t1, t0, a2
+    andn        t2, a3, t0
+    and         t3, t1, t2
+
+    bnez        t3, L(count_pos)
+    addi.d      a0, a0, 8
+
+L(loop):
+    ld.d        t0, a0, 0
+    xor         t0, t0, a1
+
+    sub.d       t1, t0, a2
+    andn        t2, a3, t0
+    and         t3, t1, t2
+    bnez        t3, L(count_pos)
+
+    ld.d        t0, a0, 8
+    addi.d      a0, a0, 16
+    xor         t0, t0, a1
+    sub.d       t1, t0, a2
+
+    andn        t2, a3, t0
+    and         t3, t1, t2
+    beqz        t3, L(loop)
+    addi.d      a0, a0, -8
+L(count_pos):
+    ctz.d       t0, t3
+    srli.d      t0, t0, 3
+    add.d       a0, a0, t0
+    jr          ra
+
+L(loop_7bit):
+    ld.d        t0, a0, 0
+L(find_zero):
+    sub.d       t1, t0, a2
+    and         t2, t1, a3
+    bnez        t2, L(more_check)
+
+    ld.d        t0, a0, 8
+    addi.d      a0, a0, 16
+    sub.d       t1, t0, a2
+    and         t2, t1, a3
+
+    beqz        t2, L(loop_7bit)
+    addi.d      a0, a0, -8
+
+L(more_check):
+    andn        t2, a3, t0
+    and         t3, t1, t2
+    bnez        t3, L(count_pos)
+    addi.d      a0, a0, 8
+
+L(loop_8bit):
+    ld.d        t0, a0, 0
+
+    sub.d       t1, t0, a2
+    andn        t2, a3, t0
+    and         t3, t1, t2
+    bnez        t3, L(count_pos)
+
+    ld.d        t0, a0, 8
+    addi.d      a0, a0, 16
+    sub.d       t1, t0, a2
+
+    andn        t2, a3, t0
+    and         t3, t1, t2
+    beqz        t3, L(loop_8bit)
+
+    addi.d      a0, a0, -8
+    b           L(count_pos)
+
+END(RAWMEMCHR_NAME)
+
+libc_hidden_builtin_def (__rawmemchr)
diff --git a/sysdeps/loongarch/lp64/multiarch/rawmemchr-lasx.S b/sysdeps/loongarch/lp64/multiarch/rawmemchr-lasx.S
new file mode 100644
index 0000000000..be2eb59dbe
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/rawmemchr-lasx.S
@@ -0,0 +1,82 @@
+/* Optimized rawmemchr 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/asm.h>
+#include <sys/regdef.h>
+
+#if IS_IN (libc) && !defined __loongarch_soft_float
+
+# define RAWMEMCHR __rawmemchr_lasx
+
+LEAF(RAWMEMCHR, 6)
+    move            a2, a0
+    bstrins.d       a0, zero, 5, 0
+    xvld            xr0, a0, 0
+    xvld            xr1, a0, 32
+
+    xvreplgr2vr.b   xr2, a1
+    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
+    sra.d           t0, t0, a2
+
+
+    beqz            t0, L(loop)
+    ctz.d           t0, t0
+    add.d           a0, a2, t0
+    jr              ra
+
+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
+    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
+
+    ctz.d           t0, t0
+    add.d           a0, a0, t0
+    jr              ra
+END(RAWMEMCHR)
+
+libc_hidden_builtin_def (RAWMEMCHR)
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/rawmemchr-lsx.S b/sysdeps/loongarch/lp64/multiarch/rawmemchr-lsx.S
new file mode 100644
index 0000000000..2f6fe024dc
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/rawmemchr-lsx.S
@@ -0,0 +1,71 @@
+/* Optimized rawmemchr 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 RAWMEMCHR __rawmemchr_lsx
+
+LEAF(RAWMEMCHR, 6)
+    move            a2, a0
+    bstrins.d       a0, zero, 4, 0
+    vld             vr0, a0, 0
+    vld             vr1, a0, 16
+
+    vreplgr2vr.b    vr2, a1
+    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
+    sra.w           t0, t0, a2
+
+    beqz            t0, L(loop)
+    ctz.w           t0, t0
+    add.d           a0, a2, t0
+    jr              ra
+
+
+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
+    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
+
+    ctz.w           t0, t0
+    add.d           a0, a0, t0
+    jr              ra
+END(RAWMEMCHR)
+
+libc_hidden_builtin_def (RAWMEMCHR)
+#endif
diff --git a/sysdeps/loongarch/lp64/multiarch/rawmemchr.c b/sysdeps/loongarch/lp64/multiarch/rawmemchr.c
new file mode 100644
index 0000000000..89c7ffff8f
--- /dev/null
+++ b/sysdeps/loongarch/lp64/multiarch/rawmemchr.c
@@ -0,0 +1,37 @@
+/* Multiple versions of rawmemchr.
+   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/>.  */
+
+#if IS_IN (libc)
+# define rawmemchr __redirect_rawmemchr
+# define __rawmemchr __redirect___rawmemchr
+# include <string.h>
+# undef rawmemchr
+# undef __rawmemchr
+
+# define SYMBOL_NAME rawmemchr
+# include "ifunc-rawmemchr.h"
+
+libc_ifunc_redirected (__redirect_rawmemchr, __rawmemchr,
+                       IFUNC_SELECTOR ());
+weak_alias (__rawmemchr, rawmemchr)
+# ifdef SHARED
+__hidden_ver1 (__rawmemchr, __GI___rawmemchr, __redirect___rawmemchr)
+  __attribute__((visibility ("hidden")));
+# endif
+#endif