/*
 * Copyright (c) 2021, 2023-2024 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#pragma once

#if defined(__aarch64__)

namespace {

void a64_transpose_interleave_12_2x4(uint16_t *out, const uint16_t *in, size_t width, size_t in_stride, size_t height)
{
    uint16_t *pad_row = reinterpret_cast<uint16_t *>(alloca(width * sizeof(uint16_t)));

    if (height % 4) {
        memset(pad_row, 0, width * sizeof(uint16_t));
    }

    size_t out_stride = 12 * roundup<size_t>(height, 4) * sizeof(uint16_t);

    __asm__ __volatile__(
      "cmp %x[height], #0x8\n"
      "blt 11f\n"
      "1:"  // Main row loop: Head
      "mov x9, %x[in]\n"
      "mov x28, %x[width]\n"
      "mov x27, %x[out]\n"
      "sub %x[height], %x[height], #0x8\n"
      "add x26, x9, %x[in_stride]\n"
      "add x25, x26, %x[in_stride]\n"
      "add x24, x25, %x[in_stride]\n"
      "cmp x28, #0x18\n"
      "add x23, x24, %x[in_stride]\n"
      "add x22, x23, %x[in_stride]\n"
      "add x21, x22, %x[in_stride]\n"
      "add x20, x21, %x[in_stride]\n"
      "add %x[in], x20, %x[in_stride]\n"
      "blt 3f\n"
      "2:"  // Main row loop: Unroll column loop
      "ldr q27, [x9], #0x10\n"
      "ldr q26, [x26], #0x10\n"
      "sub x28, x28, #0x18\n"
      "ldr q25, [x25], #0x10\n"
      "ldr q24, [x24], #0x10\n"
      "cmp x28, #0x18\n"
      "ldr q23, [x23], #0x10\n"
      "ldr q22, [x22], #0x10\n"
      "ldr q21, [x21], #0x10\n"
      "ldr q20, [x20], #0x10\n"
      "ldr q19, [x9], #0x10\n"
      "ldr q18, [x26], #0x10\n"
      "zip1 v15.8h, v27.8h, v25.8h\n"
      "zip1 v14.8h, v26.8h, v24.8h\n"
      "ldr q17, [x25], #0x10\n"
      "ldr q16, [x24], #0x10\n"
      "zip2 v13.8h, v27.8h, v25.8h\n"
      "zip2 v12.8h, v26.8h, v24.8h\n"
      "ldr q1, [x23], #0x10\n"
      "ldr q0, [x22], #0x10\n"
      "zip1 v11.8h, v23.8h, v21.8h\n"
      "zip1 v10.8h, v22.8h, v20.8h\n"
      "ldr q31, [x21], #0x10\n"
      "ldr q24, [x20], #0x10\n"
      "zip2 v30.8h, v23.8h, v21.8h\n"
      "zip2 v29.8h, v22.8h, v20.8h\n"
      "ldr q23, [x9], #0x10\n"
      "ldr q22, [x26], #0x10\n"
      "zip1 v28.8h, v19.8h, v17.8h\n"
      "zip1 v27.8h, v18.8h, v16.8h\n"
      "ldr q21, [x25], #0x10\n"
      "ldr q20, [x24], #0x10\n"
      "zip2 v9.8h, v19.8h, v17.8h\n"
      "zip2 v8.8h, v18.8h, v16.8h\n"
      "ldr q19, [x23], #0x10\n"
      "ldr q18, [x22], #0x10\n"
      "zip1 v26.8h, v1.8h, v31.8h\n"
      "zip1 v25.8h, v0.8h, v24.8h\n"
      "ldr q17, [x21], #0x10\n"
      "ldr q16, [x20], #0x10\n"
      "zip2 v7.8h, v1.8h, v31.8h\n"
      "zip2 v6.8h, v0.8h, v24.8h\n"
      "zip1 v5.8h, v23.8h, v21.8h\n"
      "zip1 v24.8h, v22.8h, v20.8h\n"
      "zip2 v4.8h, v23.8h, v21.8h\n"
      "zip2 v3.8h, v22.8h, v20.8h\n"
      "zip1 v2.8h, v19.8h, v17.8h\n"
      "zip1 v1.8h, v18.8h, v16.8h\n"
      "zip2 v0.8h, v19.8h, v17.8h\n"
      "zip2 v31.8h, v18.8h, v16.8h\n"
      "zip1 v16.8h, v15.8h, v14.8h\n"
      "zip2 v23.8h, v15.8h, v14.8h\n"
      "zip1 v22.8h, v13.8h, v12.8h\n"
      "zip2 v21.8h, v13.8h, v12.8h\n"
      "zip1 v20.8h, v28.8h, v27.8h\n"
      "zip2 v19.8h, v28.8h, v27.8h\n"
      "zip1 v18.8h, v11.8h, v10.8h\n"
      "zip2 v17.8h, v11.8h, v10.8h\n"
      "str q16, [x27, #0x0]\n"
      "zip1 v16.8h, v30.8h, v29.8h\n"
      "zip2 v30.8h, v30.8h, v29.8h\n"
      "str q23, [x27, #0x10]\n"
      "zip1 v29.8h, v26.8h, v25.8h\n"
      "zip2 v28.8h, v26.8h, v25.8h\n"
      "str q22, [x27, #0x20]\n"
      "str q21, [x27, #0x30]\n"
      "zip1 v27.8h, v9.8h, v8.8h\n"
      "zip2 v26.8h, v9.8h, v8.8h\n"
      "str q20, [x27, #0x40]\n"
      "zip1 v25.8h, v5.8h, v24.8h\n"
      "zip2 v24.8h, v5.8h, v24.8h\n"
      "str q19, [x27, #0x50]\n"
      "zip1 v23.8h, v4.8h, v3.8h\n"
      "zip2 v22.8h, v4.8h, v3.8h\n"
      "str q18, [x27, #0x60]\n"
      "zip1 v21.8h, v7.8h, v6.8h\n"
      "zip2 v20.8h, v7.8h, v6.8h\n"
      "str q17, [x27, #0x70]\n"
      "zip1 v19.8h, v2.8h, v1.8h\n"
      "zip2 v18.8h, v2.8h, v1.8h\n"
      "str q16, [x27, #0x80]\n"
      "zip1 v17.8h, v0.8h, v31.8h\n"
      "zip2 v16.8h, v0.8h, v31.8h\n"
      "str q30, [x27, #0x90]\n"
      "str q29, [x27, #0xa0]\n"
      "str q28, [x27, #0xb0]\n"
      "add x27, x27, %x[out_stride]\n"
      "str q27, [x27, #0x0]\n"
      "str q26, [x27, #0x10]\n"
      "str q25, [x27, #0x20]\n"
      "str q24, [x27, #0x30]\n"
      "str q23, [x27, #0x40]\n"
      "str q22, [x27, #0x50]\n"
      "str q21, [x27, #0x60]\n"
      "str q20, [x27, #0x70]\n"
      "str q19, [x27, #0x80]\n"
      "str q18, [x27, #0x90]\n"
      "str q17, [x27, #0xa0]\n"
      "str q16, [x27, #0xb0]\n"
      "add x27, x27, %x[out_stride]\n"
      "bge 2b\n"
      "3:"  // Main row loop: Unroll column loop skip
      "cmp x28, #0xc\n"
      "blt 5f\n"
      "4:"  // Main row loop: Column loop
      "ldr q23, [x9], #0x10\n"
      "ldr q22, [x26], #0x10\n"
      "sub x28, x28, #0xc\n"
      "ldr q21, [x25], #0x10\n"
      "ldr q16, [x24], #0x10\n"
      "cmp x28, #0xc\n"
      "ldr q1, [x23], #0x10\n"
      "ldr q0, [x22], #0x10\n"
      "ldr q28, [x21], #0x10\n"
      "ldr q27, [x20], #0x10\n"
      "ldr d20, [x9], #0x8\n"
      "ldr d19, [x26], #0x8\n"
      "zip1 v26.8h, v23.8h, v21.8h\n"
      "zip1 v25.8h, v22.8h, v16.8h\n"
      "ldr d18, [x25], #0x8\n"
      "ldr d17, [x24], #0x8\n"
      "zip2 v31.8h, v23.8h, v21.8h\n"
      "zip2 v24.8h, v22.8h, v16.8h\n"
      "ldr d23, [x23], #0x8\n"
      "ldr d22, [x22], #0x8\n"
      "zip1 v30.8h, v1.8h, v28.8h\n"
      "zip1 v29.8h, v0.8h, v27.8h\n"
      "ldr d21, [x21], #0x8\n"
      "ldr d16, [x20], #0x8\n"
      "zip2 v28.8h, v1.8h, v28.8h\n"
      "zip2 v27.8h, v0.8h, v27.8h\n"
      "zip1 v20.8h, v20.8h, v18.8h\n"
      "zip1 v19.8h, v19.8h, v17.8h\n"
      "zip1 v18.8h, v26.8h, v25.8h\n"
      "zip2 v17.8h, v26.8h, v25.8h\n"
      "zip1 v26.8h, v23.8h, v21.8h\n"
      "zip1 v25.8h, v22.8h, v16.8h\n"
      "zip1 v16.8h, v31.8h, v24.8h\n"
      "zip2 v24.8h, v31.8h, v24.8h\n"
      "zip1 v23.8h, v20.8h, v19.8h\n"
      "zip2 v22.8h, v20.8h, v19.8h\n"
      "str q18, [x27, #0x0]\n"
      "zip1 v21.8h, v30.8h, v29.8h\n"
      "zip2 v20.8h, v30.8h, v29.8h\n"
      "str q17, [x27, #0x10]\n"
      "zip1 v19.8h, v28.8h, v27.8h\n"
      "zip2 v18.8h, v28.8h, v27.8h\n"
      "str q16, [x27, #0x20]\n"
      "zip1 v17.8h, v26.8h, v25.8h\n"
      "zip2 v16.8h, v26.8h, v25.8h\n"
      "str q24, [x27, #0x30]\n"
      "str q23, [x27, #0x40]\n"
      "str q22, [x27, #0x50]\n"
      "str q21, [x27, #0x60]\n"
      "str q20, [x27, #0x70]\n"
      "str q19, [x27, #0x80]\n"
      "str q18, [x27, #0x90]\n"
      "str q17, [x27, #0xa0]\n"
      "str q16, [x27, #0xb0]\n"
      "add x27, x27, %x[out_stride]\n"
      "bge 4b\n"
      "5:"  // Main row loop: Column loop skip
      "cbz x28, 10f\n"
      "cmp x28, #0x4\n"
      "movi v16.8h, #0x0\n"
      "str q16, [x27, #0x0]\n"
      "str q16, [x27, #0x10]\n"
      "str q16, [x27, #0x20]\n"
      "str q16, [x27, #0x30]\n"
      "str q16, [x27, #0x40]\n"
      "str q16, [x27, #0x50]\n"
      "str q16, [x27, #0x60]\n"
      "str q16, [x27, #0x70]\n"
      "str q16, [x27, #0x80]\n"
      "str q16, [x27, #0x90]\n"
      "str q16, [x27, #0xa0]\n"
      "str q16, [x27, #0xb0]\n"
      "blt 7f\n"
      "6:"  // Main row loop: width 4 loop: loop
      "ldr d23, [x9], #0x8\n"
      "ldr d22, [x26], #0x8\n"
      "sub x28, x28, #0x4\n"
      "ldr d18, [x25], #0x8\n"
      "ldr d17, [x24], #0x8\n"
      "cmp x28, #0x4\n"
      "ldr d20, [x23], #0x8\n"
      "ldr d21, [x22], #0x8\n"
      "ldr d19, [x21], #0x8\n"
      "ldr d16, [x20], #0x8\n"
      "zip1 v18.8h, v23.8h, v18.8h\n"
      "zip1 v17.8h, v22.8h, v17.8h\n"
      "zip1 v20.8h, v20.8h, v19.8h\n"
      "zip1 v16.8h, v21.8h, v16.8h\n"
      "zip1 v19.8h, v18.8h, v17.8h\n"
      "zip2 v18.8h, v18.8h, v17.8h\n"
      "zip1 v17.8h, v20.8h, v16.8h\n"
      "zip2 v16.8h, v20.8h, v16.8h\n"
      "str q19, [x27, #0x0]\n"
      "str q18, [x27, #0x10]\n"
      "str q17, [x27, #0x60]\n"
      "str q16, [x27, #0x70]\n"
      "add x27, x27, #0x20\n"
      "bge 6b\n"
      "7:"  // Main row loop: width 4 loop: skip
      "cmp x28, #0x1\n"
      "blt 9f\n"
      "8:"  // Main row loop: width 1 loop: loop
      "ldr h23, [x9], #0x2\n"
      "ldr h22, [x26], #0x2\n"
      "sub x28, x28, #0x1\n"
      "ldr h19, [x25], #0x2\n"
      "ldr h17, [x24], #0x2\n"
      "cmp x28, #0x1\n"
      "ldr h21, [x23], #0x2\n"
      "ldr h20, [x22], #0x2\n"
      "ldr h18, [x21], #0x2\n"
      "ldr h16, [x20], #0x2\n"
      "zip1 v19.8h, v23.8h, v19.8h\n"
      "zip1 v17.8h, v22.8h, v17.8h\n"
      "zip1 v18.8h, v21.8h, v18.8h\n"
      "zip1 v16.8h, v20.8h, v16.8h\n"
      "zip1 v17.8h, v19.8h, v17.8h\n"
      "zip1 v16.8h, v18.8h, v16.8h\n"
      "str d17, [x27, #0x0]\n"
      "str d16, [x27, #0x60]\n"
      "add x27, x27, #0x8\n"
      "bge 8b\n"
      "9:"  // Main row loop: width 1 loop: skip
      "10:"  // Main row loop: odd col skip
      "cmp %x[height], #0x8\n"
      "add %x[out], %x[out], #0xc0\n"
      "bge 1b\n"
      "cbz %x[height], 22f\n"
      "11:"  // Main loop skip
      "12:"  // Tail row loop: Head
      "mov x9, %x[in]\n"
      "mov x20, %x[width]\n"
      "cmp %x[height], #0x3\n"
      "mov x27, %x[out]\n"
      "add x26, x9, %x[in_stride]\n"
      "add x25, x26, %x[in_stride]\n"
      "add x24, x25, %x[in_stride]\n"
      "csel x25, x25, %x[pad_row], GE\n"
      "add %x[in], x24, %x[in_stride]\n"
      "csel x24, x24, %x[pad_row], GT\n"
      "cmp %x[height], #0x1\n"
      "sub %x[height], %x[height], #0x4\n"
      "csel x26, x26, %x[pad_row], GT\n"
      "cmp x20, #0x18\n"
      "blt 14f\n"
      "13:"  // Tail row loop: Unroll column loop
      "ldr q23, [x9], #0x10\n"
      "ldr q22, [x26], #0x10\n"
      "sub x20, x20, #0x18\n"
      "ldr q21, [x25], #0x10\n"
      "ldr q16, [x24], #0x10\n"
      "cmp x20, #0x18\n"
      "ldr q26, [x9], #0x10\n"
      "ldr q25, [x26], #0x10\n"
      "ldr q24, [x25], #0x10\n"
      "ldr q20, [x24], #0x10\n"
      "ldr q19, [x9], #0x10\n"
      "zip1 v31.8h, v23.8h, v21.8h\n"
      "zip1 v30.8h, v22.8h, v16.8h\n"
      "ldr q18, [x26], #0x10\n"
      "ldr q17, [x25], #0x10\n"
      "zip2 v29.8h, v23.8h, v21.8h\n"
      "zip2 v23.8h, v22.8h, v16.8h\n"
      "ldr q16, [x24], #0x10\n"
      "zip1 v22.8h, v26.8h, v24.8h\n"
      "zip1 v21.8h, v25.8h, v20.8h\n"
      "zip2 v28.8h, v26.8h, v24.8h\n"
      "zip2 v20.8h, v25.8h, v20.8h\n"
      "zip1 v27.8h, v19.8h, v17.8h\n"
      "zip1 v26.8h, v18.8h, v16.8h\n"
      "zip2 v25.8h, v19.8h, v17.8h\n"
      "zip2 v24.8h, v18.8h, v16.8h\n"
      "zip1 v19.8h, v31.8h, v30.8h\n"
      "zip2 v18.8h, v31.8h, v30.8h\n"
      "zip1 v17.8h, v29.8h, v23.8h\n"
      "zip2 v16.8h, v29.8h, v23.8h\n"
      "zip1 v23.8h, v22.8h, v21.8h\n"
      "zip2 v22.8h, v22.8h, v21.8h\n"
      "str q19, [x27, #0x0]\n"
      "str q18, [x27, #0x10]\n"
      "zip1 v21.8h, v28.8h, v20.8h\n"
      "zip2 v20.8h, v28.8h, v20.8h\n"
      "str q17, [x27, #0x20]\n"
      "zip1 v19.8h, v27.8h, v26.8h\n"
      "zip2 v18.8h, v27.8h, v26.8h\n"
      "str q16, [x27, #0x30]\n"
      "zip1 v17.8h, v25.8h, v24.8h\n"
      "zip2 v16.8h, v25.8h, v24.8h\n"
      "str q23, [x27, #0x40]\n"
      "str q22, [x27, #0x50]\n"
      "add x27, x27, %x[out_stride]\n"
      "str q21, [x27, #0x0]\n"
      "str q20, [x27, #0x10]\n"
      "str q19, [x27, #0x20]\n"
      "str q18, [x27, #0x30]\n"
      "str q17, [x27, #0x40]\n"
      "str q16, [x27, #0x50]\n"
      "add x27, x27, %x[out_stride]\n"
      "bge 13b\n"
      "14:"  // Tail row loop: Unroll column loop skip
      "cmp x20, #0xc\n"
      "blt 16f\n"
      "15:"  // Tail row loop: Column loop
      "ldr q25, [x9], #0x10\n"
      "ldr q24, [x26], #0x10\n"
      "sub x20, x20, #0xc\n"
      "ldr q18, [x25], #0x10\n"
      "ldr q17, [x24], #0x10\n"
      "cmp x20, #0xc\n"
      "ldr d22, [x9], #0x8\n"
      "ldr d23, [x26], #0x8\n"
      "ldr d21, [x25], #0x8\n"
      "ldr d16, [x24], #0x8\n"
      "zip1 v20.8h, v25.8h, v18.8h\n"
      "zip1 v19.8h, v24.8h, v17.8h\n"
      "zip2 v18.8h, v25.8h, v18.8h\n"
      "zip2 v17.8h, v24.8h, v17.8h\n"
      "zip1 v22.8h, v22.8h, v21.8h\n"
      "zip1 v16.8h, v23.8h, v16.8h\n"
      "zip1 v21.8h, v20.8h, v19.8h\n"
      "zip2 v20.8h, v20.8h, v19.8h\n"
      "zip1 v19.8h, v18.8h, v17.8h\n"
      "zip2 v18.8h, v18.8h, v17.8h\n"
      "zip1 v17.8h, v22.8h, v16.8h\n"
      "zip2 v16.8h, v22.8h, v16.8h\n"
      "str q21, [x27, #0x0]\n"
      "str q20, [x27, #0x10]\n"
      "str q19, [x27, #0x20]\n"
      "str q18, [x27, #0x30]\n"
      "str q17, [x27, #0x40]\n"
      "str q16, [x27, #0x50]\n"
      "add x27, x27, %x[out_stride]\n"
      "bge 15b\n"
      "16:"  // Tail row loop: Column loop skip
      "cbz x20, 21f\n"
      "cmp x20, #0x4\n"
      "movi v16.8h, #0x0\n"
      "str q16, [x27, #0x0]\n"
      "str q16, [x27, #0x10]\n"
      "str q16, [x27, #0x20]\n"
      "str q16, [x27, #0x30]\n"
      "str q16, [x27, #0x40]\n"
      "str q16, [x27, #0x50]\n"
      "blt 18f\n"
      "17:"  // Tail row loop: width 4 loop: loop
      "ldr d18, [x9], #0x8\n"
      "ldr d19, [x26], #0x8\n"
      "sub x20, x20, #0x4\n"
      "ldr d17, [x25], #0x8\n"
      "ldr d16, [x24], #0x8\n"
      "cmp x20, #0x4\n"
      "zip1 v18.8h, v18.8h, v17.8h\n"
      "zip1 v16.8h, v19.8h, v16.8h\n"
      "zip1 v17.8h, v18.8h, v16.8h\n"
      "zip2 v16.8h, v18.8h, v16.8h\n"
      "str q17, [x27, #0x0]\n"
      "str q16, [x27, #0x10]\n"
      "add x27, x27, #0x20\n"
      "bge 17b\n"
      "18:"  // Tail row loop: width 4 loop: skip
      "cmp x20, #0x1\n"
      "blt 20f\n"
      "19:"  // Tail row loop: width 1 loop: loop
      "ldr h19, [x9], #0x2\n"
      "ldr h18, [x26], #0x2\n"
      "sub x20, x20, #0x1\n"
      "ldr h17, [x25], #0x2\n"
      "ldr h16, [x24], #0x2\n"
      "cmp x20, #0x1\n"
      "zip1 v17.8h, v19.8h, v17.8h\n"
      "zip1 v16.8h, v18.8h, v16.8h\n"
      "zip1 v16.8h, v17.8h, v16.8h\n"
      "str d16, [x27, #0x0]\n"
      "add x27, x27, #0x8\n"
      "bge 19b\n"
      "20:"  // Tail row loop: width 1 loop: skip
      "21:"  // Tail row loop: odd col skip
      "cmp %x[height], #0x1\n"
      "add %x[out], %x[out], #0x60\n"
      "bge 12b\n"
      "22:"  // Done
      : [height] "+&r" (height), [in] "+&r" (in), [out] "+&r" (out)
      : [in_stride] "r" (in_stride), [out_stride] "r" (out_stride), [pad_row] "r" (pad_row), [width] "r" (width)
      : "cc", "memory", "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", "x9", "x20", "x21", "x22", "x23", "x24", "x25", "x26", "x27", "x28"
    );
}

} // anonymous namespace

template<>
void Transform<12, 4, true, VLType::None>(
    bfloat16 *out, const bfloat16 *in, int stride, int x0, int xmax, int k0, int kmax)
{
    a64_transpose_interleave_12_2x4(
        reinterpret_cast<uint16_t *>(out),
        reinterpret_cast<const uint16_t *>(in + k0 * stride + x0),
        (xmax-x0) * sizeof(bfloat16) / 2,
        stride * sizeof(bfloat16),
        (kmax-k0)
    );
}


#endif  // defined(__aarch64__)