// 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 == 2
$assert MR % 2 == 0
#include <assert.h>

#include <xmmintrin.h>

#include <xnnpack/igemm.h>


void xnn_f32_igemm_minmax_ukernel_${MR}x${NR}c4__sse(
    size_t mr,
    size_t nc,
    size_t kc,
    size_t ks,
    const float**restrict a,
    const float*restrict w,
    float*restrict c,
    size_t cm_stride,
    size_t cn_stride,
    size_t a_offset,
    const float* zero,
    const union xnn_f32_minmax_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
  assert(mr != 0);
  assert(mr <= ${MR});
  assert(nc != 0);
  assert(kc != 0);
  assert(kc % sizeof(float) == 0);
  assert(ks != 0);
  assert(ks % (${MR} * sizeof(void*)) == 0);
  assert(a_offset % sizeof(float) == 0);
  assert(a != NULL);
  assert(w != NULL);
  assert(c != NULL);

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

  do {
    __m128 vacc0x0c4 = _mm_load_ss(w);
    $for N in range(1, NR):
      __m128 vacc0x${N}c4 = _mm_load_ss(w + ${N});
    $for M in range(1, MR):
      $for N in range(NR):
        __m128 vacc${M}x${N}c4 = vacc0x${N}c4;
    w += ${NR};

    size_t p = ks;
    do {
      $for M in range(MR):
        const float* restrict a${M} = a[${M}];
        assert(a${M} != NULL);
        if XNN_UNPREDICTABLE(a${M} != zero) {
          a${M} = (const float*) ((uintptr_t) a${M} + a_offset);
        }
      a += ${MR};

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

        const __m128 vb0 = _mm_loadu_ps(w);
        $for N in range(1, NR):
          const __m128 vb${N} = _mm_loadu_ps(w + ${N * 4});
        w += ${NR * 4};

        $for M in range(MR):
          $for N in range(NR):
            vacc${M}x${N}c4 = _mm_add_ps(vacc${M}x${N}c4, _mm_mul_ps(va${M}, vb${N}));
      }
      if XNN_UNLIKELY(k != 0) {
        $for M in range(MR):
          const __m128 va${M} = _mm_loadu_ps(a${M});

        const __m128 vb0 = _mm_loadu_ps(w);
        $for N in range(1, NR):
          const __m128 vb${N} = _mm_loadu_ps(w + ${N * 4});
        w += ${NR * 4};

        $for N in range(NR):
          const __m128 vmask${N} = _mm_cmpeq_ps(_mm_setzero_ps(), vb${N});

        $for M in range(MR):
          $for N in range(NR):
            vacc${M}x${N}c4 = _mm_add_ps(vacc${M}x${N}c4, _mm_mul_ps(_mm_andnot_ps(vmask${N}, va${M}), vb${N}));
      }
      p -= ${MR} * sizeof(void*);
    } while (p != 0);

    $for M in range(MR):
      const __m128 vacc${M}x01c2 = _mm_add_ps(_mm_unpacklo_ps(vacc${M}x0c4, vacc${M}x1c4), _mm_unpackhi_ps(vacc${M}x0c4, vacc${M}x1c4));

    $for M in range(0, MR, 2):
      __m128 vacc${M}${M+1}x01 = _mm_add_ps(_mm_movelh_ps(vacc${M}x01c2, vacc${M+1}x01c2), _mm_movehl_ps(vacc${M+1}x01c2, vacc${M}x01c2));

    const __m128 vmax = _mm_load_ps(params->sse.max);
    $for M in range(0, MR, 2):
      vacc${M}${M+1}x01 = _mm_min_ps(vacc${M}${M+1}x01, vmax);

    const __m128 vmin = _mm_load_ps(params->sse.min);
    $for M in range(0, MR, 2):
      vacc${M}${M+1}x01 = _mm_max_ps(vacc${M}${M+1}x01, vmin);

    if XNN_LIKELY(nc >= ${NR}) {
      $for M in reversed(range(0, MR, 2)):
        _mm_storeh_pi((__m64*) c${M+1}, vacc${M}${M+1}x01);
        c${M+1} = (float*) ((uintptr_t) c${M+1} + cn_stride);
        _mm_storel_pi((__m64*) c${M}, vacc${M}${M+1}x01);
        c${M} = (float*) ((uintptr_t) c${M} + cn_stride);

      a = (const float**restrict) ((uintptr_t) a - ks);
      nc -= ${NR};
    } else {
      assert(nc == 1);
      $for M in reversed(range(0, MR, 2)):
        _mm_store_ss(c${M+1}, _mm_movehl_ps(vacc${M}${M+1}x01, vacc${M}${M+1}x01));
        _mm_store_ss(c${M}, vacc${M}${M+1}x01);

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