/*
 * Copyright (c) 2022-2024 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(ARM_COMPUTE_ENABLE_SME)

namespace {

void sme_transpose_interleave_2VL_1x4(uint8_t *out, const uint8_t *in, size_t width, size_t in_stride, size_t height)
{
    uint8_t *pad_row = reinterpret_cast<uint8_t *>(alloca(width * sizeof(uint8_t)));

    if (height % 4) {
        memset(pad_row, 0, width * sizeof(uint8_t));
    }

    size_t out_stride = 2 * roundup<size_t>(height, 4) * sme::get_vector_length<uint32_t>();

    __asm__ __volatile__(
      ".inst 0xd503477f  // SMSTART ZA\n"
      "ptrue p1.b\n"
      "1:"  // Main row loop: Head
      "mov x26, %x[in]\n"
      "cmp %x[height], #0x3\n"
      "add x25, x26, %x[in_stride]\n"
      "mov x24, %x[width]\n"
      "add x23, x25, %x[in_stride]\n"
      "cntb x22\n"
      "add x21, x23, %x[in_stride]\n"
      "csel x23, x23, %x[pad_row], GE\n"
      "add %x[in], x21, %x[in_stride]\n"
      "csel x21, x21, %x[pad_row], GT\n"
      "cmp %x[height], #0x1\n"
      "mov x20, %x[out]\n"
      "csel x25, x25, %x[pad_row], GT\n"
      "cmp x24, x22\n"
      "sub %x[height], %x[height], #0x4\n"
      "blt 3f\n"
      "2:"  // Main row loop: Unroll column loop
      "ld1b { z20.b }, p1/Z, [x26]\n"
      "sub x24, x24, x22\n"
      "addvl x26, x26, #1\n"
      "ld1b { z19.b }, p1/Z, [x25]\n"
      "cmp x24, x22\n"
      "addvl x25, x25, #1\n"
      "ld1b { z17.b }, p1/Z, [x23]\n"
      "addvl x23, x23, #1\n"
      "ld1b { z16.b }, p1/Z, [x21]\n"
      "addvl x21, x21, #1\n"
      "zip1 z18.b, z20.b, z17.b\n"
      "zip2 z20.b, z20.b, z17.b\n"
      "zip1 z17.b, z19.b, z16.b\n"
      "zip2 z16.b, z19.b, z16.b\n"
      "zip1 z19.b, z18.b, z17.b\n"
      "zip2 z18.b, z18.b, z17.b\n"
      "zip1 z17.b, z20.b, z16.b\n"
      "zip2 z16.b, z20.b, z16.b\n"
      "st1b { z19.b }, p1, [x20]\n"
      "st1b { z18.b }, p1, [x20, #1, MUL VL]\n"
      "add x20, x20, %x[out_stride]\n"
      "st1b { z17.b }, p1, [x20]\n"
      "st1b { z16.b }, p1, [x20, #1, MUL VL]\n"
      "add x20, x20, %x[out_stride]\n"
      "bge 2b\n"
      "3:"  // Main row loop: Unroll column loop skip
      "cbz x24, 5f\n"
      "4:"  // Main row loop: Column loop
      "whilelt p0.b, XZR, x24\n"
      "decw x24, ALL, MUL #2\n"
      "ld1b { z18.b }, p0/Z, [x26]\n"
      "cmp x24, #0x0\n"
      "incd x26, ALL, MUL #4\n"
      "ld1b { z19.b }, p0/Z, [x25]\n"
      "incd x25, ALL, MUL #4\n"
      "ld1b { z17.b }, p0/Z, [x23]\n"
      "incd x23, ALL, MUL #4\n"
      "ld1b { z16.b }, p0/Z, [x21]\n"
      "incd x21, ALL, MUL #4\n"
      "zip1 z18.b, z18.b, z17.b\n"
      "zip1 z16.b, z19.b, z16.b\n"
      "zip1 z17.b, z18.b, z16.b\n"
      "zip2 z16.b, z18.b, z16.b\n"
      "st1b { z17.b }, p1, [x20]\n"
      "st1b { z16.b }, p1, [x20, #1, MUL VL]\n"
      "add x20, x20, %x[out_stride]\n"
      "bgt 4b\n"
      "5:"  // Main row loop: Column loop skip
      "cmp %x[height], #0x1\n"
      "addvl %x[out], %x[out], #2\n"
      "bge 1b\n"
      ".inst 0xd503467f  // SMSTOP\n"
      : [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", "p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", "x20", "x21", "x22", "x23", "x24", "x25", "x26", "z0", "z1", "z2", "z3", "z4", "z5", "z6", "z7", "z8", "z9", "z10", "z11", "z12", "z13", "z14", "z15", "z16", "z17", "z18", "z19", "z20", "z21", "z22", "z23", "z24", "z25", "z26", "z27", "z28", "z29", "z30", "z31"
    );
}

} // anonymous namespace

template<>
void Transform<2, 4, true, VLType::SME>(
    uint8_t *out, const uint8_t *in, int stride, int x0, int xmax, int k0, int kmax)
{
    sme_transpose_interleave_2VL_1x4(
        reinterpret_cast<uint8_t *>(out),
        reinterpret_cast<const uint8_t *>(in + k0 * stride + x0),
        (xmax-x0) * sizeof(uint8_t) / 1,
        stride * sizeof(uint8_t),
        (kmax-k0)
    );
}

template<>
void Transform<2, 4, true, VLType::SME>(
    int8_t *out, const int8_t *in, int stride, int x0, int xmax, int k0, int kmax)
{
    sme_transpose_interleave_2VL_1x4(
        reinterpret_cast<uint8_t *>(out),
        reinterpret_cast<const uint8_t *>(in + k0 * stride + x0),
        (xmax-x0) * sizeof(int8_t) / 1,
        stride * sizeof(int8_t),
        (kmax-k0)
    );
}


#endif  // defined(ARM_COMPUTE_ENABLE_SME)
