/* 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