// 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 MR % 4 == 0
$assert NR % 4 == 0
$ABC = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#include <assert.h>

#include <wasm_simd128.h>

#include <xnnpack/ppmm.h>


$WASM_F32X4_MIN={"MINMAX": "wasm_f32x4_min", "PMINMAX": "wasm_f32x4_pmin"}[MINMAX]
$WASM_F32X4_MAX={"MINMAX": "wasm_f32x4_max", "PMINMAX": "wasm_f32x4_pmax"}[MINMAX]
$ARCH_SUFFIX = "_x86" if MINMAX == "PMINMAX" else "_arm"
void xnn_f32_ppmm_minmax_ukernel_${MR}x${NR}__wasmsimd${ARCH_SUFFIX}_splat(
  size_t mr,
  size_t nc,
  size_t kc,
  const float*restrict a,
  const float*restrict w,
  float*restrict c,
  size_t cm_stride,
  size_t cn_stride,
  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);

  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};
      }

  const v128_t vmin = wasm_v128_load64_splat(params->wasmsimd.min);
  const v128_t vmax = wasm_v128_load64_splat(params->wasmsimd.max);
  do {
    v128_t vacc0x${ABC[0:4]} = wasm_v128_load(w);
    $for N in range(4, NR, 4):
      v128_t vacc0x${ABC[N:N+4]} = wasm_v128_load(w + ${N});
    $for M in range(1, MR):
      $for N in range(0, NR, 4):
        v128_t vacc${M}x${ABC[N:N+4]} = vacc0x${ABC[N:N+4]};
    w += ${NR};

    size_t k = kc;
    do {
      const v128_t va${ABC[0:4]} = wasm_v128_load(a);
      $for M in range(4, MR, 4):
        const v128_t va${ABC[M:M+4]} = wasm_v128_load(a + ${M});
      a += ${MR};

      const v128_t vb${ABC[0:4]} = wasm_v128_load(w);
      $for N in range(4, NR, 4):
        const v128_t vb${ABC[N:N+4]} = wasm_v128_load(w + ${N});
      w += ${NR};

      $for M in range(MR):
        $MMMM = str(M) * 4
        const v128_t va${MMMM} = wasm_v32x4_shuffle(va${ABC[M&-4:4+M&-4]}, va${ABC[M&-4:4+M&-4]}, ${M}, ${M}, ${M}, ${M});

      $for N in range(0, NR, 4):
        $for M in range(MR):
          $MMMM = str(M) * 4
          vacc${M}x${ABC[N:N+4]} = wasm_f32x4_add(vacc${M}x${ABC[N:N+4]}, wasm_f32x4_mul(va${MMMM}, vb${ABC[N:N+4]}));

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

    $for N in range(0, NR, 4):
      $for M in range(MR):
        vacc${M}x${ABC[N:N+4]} = ${WASM_F32X4_MAX}(vmin, vacc${M}x${ABC[N:N+4]});

    $for N in range(0, NR, 4):
      $for M in range(MR):
        vacc${M}x${ABC[N:N+4]} = ${WASM_F32X4_MIN}(vmax, vacc${M}x${ABC[N:N+4]});

    if XNN_LIKELY(nc >= ${NR}) {
      $for M in reversed(range(MR)):
        wasm_v128_store(c${M}, vacc${M}x${ABC[0:4]});
        $for N in range(4, NR, 4):
          wasm_v128_store(c${M} + ${N}, vacc${M}x${ABC[N:N+4]});

      a = (const float*) ((uintptr_t) a - kc * ${MR});

      $for M in reversed(range(MR)):
        c${M} = (float*) ((uintptr_t) c${M} + cn_stride);

      nc -= ${NR};
    } else {
      $for LOG2N in reversed(range(NR.bit_length())):
        $if NR != 1 << LOG2N:
          if (nc & ${1 << LOG2N}) {
            $if LOG2N >= 2:
              $for M in reversed(range(MR)):
                wasm_v128_store(c${M}, vacc${M}x${ABC[0:4]});
                $for N in range(4, 1 << LOG2N, 4):
                  wasm_v128_store(c${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:
              $for M in reversed(range(MR)):
                *((double*) c${M}) = wasm_f64x2_extract_lane(vacc${M}x${ABC[0:4]}, 0);

              $for M in reversed(range(MR)):
                vacc${M}x${ABC[0:4]} = wasm_v32x4_shuffle(vacc${M}x${ABC[0:4]}, vacc${M}x${ABC[0:4]}, 2, 3, 2, 3);

              $for M in reversed(range(MR)):
                c${M} += 2;
            $elif LOG2N == 0:
              $for M in reversed(range(MR)):
                *c${M} = wasm_f32x4_extract_lane(vacc${M}x${ABC[0:4]}, 0);
          }

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