// Copyright 2019 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 % 4 == 0
$ABC = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
$SSE_HEADER = {1: "xmmintrin.h", 2: "emmintrin.h"}[SSE]
#include <assert.h>

#include <${SSE_HEADER}>

#include <xnnpack/gemm.h>


$ISA = {1: "sse", 2: "sse2"}[SSE]
void xnn_f32_gemm${"inc" if INC else ""}_minmax_ukernel_${MR}x${NR}__${ISA}_dup(
    size_t mr,
    size_t nc,
    size_t kc,
    const float*restrict a,
    size_t a_stride,
    const float*restrict w,
    float*restrict c,
    size_t cm_stride,
    size_t cn_stride,
    $if INC:
      const float*restrict acc,
    const union xnn_f32_minmax_params params[restrict XNN_MIN_ELEMENTS(1)])
{
  assert(mr != 0);
  assert(mr <= ${MR});
  assert(nc != 0);
  assert(kc != 0);
  assert(kc % sizeof(float) == 0);
  assert(a != NULL);
  assert(w != NULL);
  assert(c != NULL);
  $if INC:
    assert(acc != NULL);

  const float* a0 = a;
  float* c0 = c;
  $for M in range(1, MR):
    const float* a${M} = (const float*) ((uintptr_t) a${M-1} + a_stride);
    float* c${M} = (float*) ((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):
        $for N in range(0, NR, 4):
          __m128 vacc${M}x${ABC[N:N+4]} = _mm_load_ps(acc + ${M*NR+N});
      acc += ${MR*NR};
    $else:
      $for N in range(0, NR, 4):
        __m128 vacc0x${ABC[N:N+4]} = _mm_load_ps(w + ${N});
      $for M in range(1, MR):
        $for N in range(0, NR, 4):
          __m128 vacc${M}x${ABC[N:N+4]} = vacc0x${ABC[N:N+4]};
      w += ${NR};

    size_t k = kc;
    while (k >= 4 * sizeof(float)) {
      $for M in range(MR):
        const __m128 va${M} = _mm_loadu_ps(a${M});
        a${M} += 4;

      $for L in range(4):
        $LLLL = str(L) * 4

        $for M in range(MR):
          $if SSE >= 2 and L < 3:
            const __m128 va${M}c${LLLL} = _mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(va${M}), _MM_SHUFFLE(${L}, ${L}, ${L}, ${L})));
          $else:
            const __m128 va${M}c${LLLL} = _mm_shuffle_ps(va${M}, va${M}, _MM_SHUFFLE(${L}, ${L}, ${L}, ${L}));

        $for N in range(0, NR, 4):
          const __m128 vb${ABC[N:N+4]}c${L} = _mm_load_ps(w + ${L * NR + N});

        $for N in range(0, NR, 4):
          $for M in range(MR):
            vacc${M}x${ABC[N:N+4]} = _mm_add_ps(vacc${M}x${ABC[N:N+4]}, _mm_mul_ps(va${M}c${LLLL}, vb${ABC[N:N+4]}c${L}));

      w += ${4 * NR};
      k -= 4 * sizeof(float);
    }
    if XNN_UNLIKELY(k != 0) {
      do {
        $for M in range(MR):
          const __m128 va${M} = _mm_load1_ps(a${M});
          a${M} += 1;

        const __m128 vb${ABC[0:4]} = _mm_load_ps(w);
        $for N in range(4, NR, 4):
          const __m128 vb${ABC[N:N+4]} = _mm_load_ps(w + ${N});
        w += ${NR};

        $for N in range(0, NR, 4):
          $for M in range(MR):
            vacc${M}x${ABC[N:N+4]} = _mm_add_ps(vacc${M}x${ABC[N:N+4]}, _mm_mul_ps(va${M}, vb${ABC[N:N+4]}));

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

    const __m128 vmax = _mm_load_ps(params->sse.max);
    $for N in range(0, NR, 4):
      $for M in range(MR):
        vacc${M}x${ABC[N:N+4]} = _mm_min_ps(vacc${M}x${ABC[N:N+4]}, vmax);

    const __m128 vmin = _mm_load_ps(params->sse.min);
    $for N in range(0, NR, 4):
      $for M in range(MR):
        vacc${M}x${ABC[N:N+4]} = _mm_max_ps(vacc${M}x${ABC[N:N+4]}, vmin);

    if XNN_LIKELY(nc >= ${NR}) {
      $for M in reversed(range(MR)):
        _mm_storeu_ps(c${M}, vacc${M}x${ABC[0:4]});
        $for N in range(4, NR, 4):
          _mm_storeu_ps(c${M} + ${N}, vacc${M}x${ABC[N:N+4]});
        c${M} = (float*) ((uintptr_t) c${M} + cn_stride);

      $for M in reversed(range(MR)):
        a${M} = (const float*) ((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 >= 2:
              $for M in reversed(range(MR)):
                _mm_storeu_ps(c${M}, vacc${M}x${ABC[0:4]});
                $for N in range(4, 1 << LOG2N, 4):
                  _mm_storeu_ps(c${M} + ${N}, vacc${M}x${ABC[N:N+4]});

              $for M in reversed(range(MR)):
                $for N in range(0, 1 << (LOG2N - 1), 4):
                  vacc${M}x${ABC[N:N+4]} = vacc${M}x${ABC[N + (1 << LOG2N):N + (1 << LOG2N)+4]};

              $for M in reversed(range(MR)):
                c${M} += ${1 << LOG2N};
            $elif LOG2N == 1:
              $for M in reversed(range(MR)):
                _mm_storel_pi((__m64*) c${M}, vacc${M}x${ABC[0:4]});

              $for M in reversed(range(MR)):
                vacc${M}x${ABC[0:4]} = _mm_movehl_ps(vacc${M}x${ABC[0:4]}, vacc${M}x${ABC[0:4]});

              $for M in reversed(range(MR)):
                c${M} += 2;
            $elif LOG2N == 0:
              $for M in reversed(range(MR)):
                _mm_store_ss(c${M}, vacc${M}x${ABC[0:4]});
          }

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