// Copyright 2020 Google LLC
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.

$assert NR % 8 == 0

#include <assert.h>

#include <arm_neon.h>

#include "xnnpack/common.h"

#include "xnnpack/gemm.h"
#include "xnnpack/intrinsics-polyfill.h"


void xnn_f16_gemm${"inc" if INC else ""}_minmax_ukernel_${MR}x${NR}__neonfp16arith_ld64(
    size_t mr,
    size_t nc,
    size_t kc,
    const xnn_float16* restrict a,
    size_t a_stride,
    const xnn_float16* restrict w,
    xnn_float16* restrict c,
    size_t cm_stride,
    size_t cn_stride,
    $if INC:
      const xnn_float16* restrict acc,
    const union xnn_f16_minmax_params params[restrict XNN_MIN_ELEMENTS(1)])
{
  assert(mr != 0);
  assert(mr <= ${MR});
  assert(nc != 0);
  assert(kc != 0);
  assert(kc % sizeof(uint16_t) == 0);
  assert(a != NULL);
  assert(w != NULL);
  assert(c != NULL);
  $if INC:
    assert(acc != NULL);

  const uint16_t* a0 = (const uint16_t*) a;
  uint16_t* c0 = (uint16_t*) c;
  $for M in range(1, MR):
    const uint16_t* a${M} = (const uint16_t*) ((uintptr_t) a${M-1} + a_stride);
    uint16_t* c${M} = (uint16_t*) ((uintptr_t) c${M-1} + cm_stride);
    $if M % 2 == 0:
      if XNN_UNPREDICTABLE(mr <= ${M}) {
        a${M} = a${M-1};
        c${M} = c${M-1};
      }
    $elif M + 1 == MR:
      if XNN_UNPREDICTABLE(mr != ${M+1}) {
        a${M} = a${M-1};
        c${M} = c${M-1};
      }
    $else:
      if XNN_UNPREDICTABLE(mr < ${M+1}) {
        a${M} = a${M-1};
        c${M} = c${M-1};
      }

  do {
    $if INC:
      $for M in range(MR):
        $for N in range(0, NR, 8):
          float16x8_t vacc${M}x${N//8} = vreinterpretq_f16_u16(vld1q_u16((const uint16_t*) acc)); acc = (const void*) ((uintptr_t) acc + sizeof(float16x8_t));
    $else:
      $for N in range(0, NR, 8):
        float16x8_t vacc0x${N//8} = vreinterpretq_f16_u16(vld1q_u16((const uint16_t*) w)); w = (const xnn_float16*) w + 8;
      $for M in range(1, MR):
        $for N in range(0, NR, 8):
          float16x8_t vacc${M}x${N//8} = vacc0x${N//8};

    size_t k = kc;
    while (k >= 4 * sizeof(uint16_t)) {
      $for M in range(MR):
        const float16x4_t va${M} = vreinterpret_f16_u16(vld1_u16(a${M})); a${M} += 4;

      $for L in range(4):
        $for N in range(0, NR, 8):
          const float16x8_t vb${N//8}c${L} = vreinterpretq_f16_u16(vld1q_u16((const uint16_t*) w)); w = (const xnn_float16*) w + 8;

        #if XNN_ARCH_ARM64
          $for N in range(0, NR, 8):
            $for M in range(MR):
              vacc${M}x${N//8} = vfmaq_lane_f16(vacc${M}x${N//8}, vb${N//8}c${L}, va${M}, ${L});
        #else
          $for N in range(0, NR, 8):
            $for M in range(MR):
              vacc${M}x${N//8} = vmlaq_lane_f16(vacc${M}x${N//8}, vb${N//8}c${L}, va${M}, ${L});
        #endif

      k -= 4 * sizeof(uint16_t);
    }
    if XNN_UNLIKELY(k != 0) {
      do {
        $for M in range(MR):
          const float16x8_t va${M} = vreinterpretq_f16_u16(vld1q_dup_u16(a${M})); a${M} += 1;

        $for N in range(0, NR, 8):
          const float16x8_t vb${N//8} = vreinterpretq_f16_u16(vld1q_u16((const uint16_t*) w)); w = (const xnn_float16*) w + 8;

        $for N in range(0, NR, 8):
          $for M in range(MR):
            vacc${M}x${N//8} = vfmaq_f16(vacc${M}x${N//8}, va${M}, vb${N//8});

        k -= sizeof(uint16_t);
      } while (k != 0);
    }

    const float16x8_t vmin = vreinterpretq_f16_u16(vld1q_dup_u16((const uint16_t*) &params->scalar.min));
    $for N in range(0, NR, 8):
      $for M in range(MR):
        vacc${M}x${N//8} = vmaxq_f16(vacc${M}x${N//8}, vmin);

    const float16x8_t vmax = vreinterpretq_f16_u16(vld1q_dup_u16((const uint16_t*) &params->scalar.max));
    $for N in range(0, NR, 8):
      $for M in range(MR):
        vacc${M}x${N//8} = vminq_f16(vacc${M}x${N//8}, vmax);

    if XNN_LIKELY(nc >= ${NR}) {
      $for M in range(MR):
        vst1q_u16(c${M}, vreinterpretq_u16_f16(vacc${M}x0));
        $for N in range(8, NR, 8):
          vst1q_u16(c${M} + ${N}, vreinterpretq_u16_f16(vacc${M}x${N//8}));
        c${M} = (uint16_t*) ((uintptr_t) c${M} + cn_stride);

      $for M in range(MR):
        a${M} = (const uint16_t*) ((uintptr_t) a${M} - kc);

      nc -= ${NR};
    } else {
      $for LOG2N in reversed(range(NR.bit_length())):
        $if NR != 1 << LOG2N:
          if (nc & ${1 << LOG2N}) {
            $if LOG2N >= 3:
              $for N in range(0, 1 << LOG2N, 8):
                $for M in range(MR):
                  vst1q_u16(c${M}, vreinterpretq_u16_f16(vacc${M}x${N//8})); c${M} += 8;

              $for M in range(MR):
                $for N in range(0, NR - (1 << LOG2N), 8):
                  vacc${M}x${N//8} = vacc${M}x${(N + (1 << LOG2N))//8};
            $elif LOG2N == 2:
              $for M in range(MR):
                vst1_u16(c${M}, vreinterpret_u16_f16(vacc${M})); c${M} += 4;

              $for M in range(MR):
                vacc${M} = vget_high_f16(vacc${M}x0);
            $elif LOG2N == 1:
              $for M in range(MR):
                vst1_lane_u32((void*) c${M}, vreinterpret_u32_f16(vacc${M}), 0); c${M} += 2;

              $for M in range(MR):
                vacc${M} = vext_f16(vacc${M}, vacc${M}, 2);
            $elif LOG2N == 0:
              $for M in range(MR):
                vst1_lane_u16(c${M}, vreinterpret_u16_f16(vacc${M}), 0);
          }
        $if LOG2N == 3:
          $for M in range(MR):
            float16x4_t vacc${M} = vget_low_f16(vacc${M}x0);

      nc = 0;
    }
  } while (nc != 0);
}