// Copyright 2021 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 DATATYPE in ["QC8", "QD8", "QS8", "QU8"]
$assert DATATYPE == "QD8" or REQUANTIZATION == "FP32"
$assert DATATYPE != "QD8" or not REQUANTIZATION
$assert VARIANT in ["LD64", "LD128"]
$assert MR <= 4
#include <assert.h>

#include <wasm_simd128.h>

#include "xnnpack/common.h"
#include "xnnpack/igemm.h"
#include "xnnpack/math.h"


$DATATYPE_SPEC = {"QC8": "qs8_qc8w", "QD8": "qd8_f32_qc8w", "QS8": "qs8", "QU8": "qu8"}[DATATYPE]
$REQUANTIZATION_SPEC = "_" + REQUANTIZATION.lower() if REQUANTIZATION else ""
$PARAMS_STRUCT = REQUANTIZATION.lower() + "_scalar"
$PARAMS_TYPE = {"QC8": "union xnn_qs8_qc8w_conv_minmax_params", "QD8": "union xnn_f32_minmax_params", "QS8": "union xnn_qs8_conv_minmax_params", "QU8": "union xnn_qu8_conv_minmax_params"}[DATATYPE]
$XINT8_T = "uint8_t" if DATATYPE == "QU8" else "int8_t"
$OUT_T = "float" if DATATYPE == "QD8" else XINT8_T
$WASM_X16X8_LOAD8X8 = "wasm_u16x8_load8x8" if DATATYPE == "QU8" else "wasm_i16x8_load8x8"
$WASM_X8X16_NARROW_I16X8 = "wasm_u8x16_narrow_i16x8" if DATATYPE == "QU8" else "wasm_i8x16_narrow_i16x8"
$WASM_X8X16_MIN = "wasm_u8x16_min" if DATATYPE == "QU8" else "wasm_i8x16_min"
void xnn_${DATATYPE_SPEC}_igemm_minmax${REQUANTIZATION_SPEC}_ukernel_${MR}x4c2s4__wasmsimd_dot16x2_${VARIANT.lower()}(
    size_t mr,
    size_t nc,
    size_t kc,
    size_t ks,
    const ${XINT8_T}** restrict a,
    const void* restrict w,
    ${OUT_T}* restrict c,
    size_t cm_stride,
    size_t cn_stride,
    size_t a_offset,
    const ${XINT8_T}* zero,
    $if DATATYPE in ["QD8"]:
      const int8_t* zero_data,
      const ${PARAMS_TYPE} params[restrict XNN_MIN_ELEMENTS(1)],
      const struct xnn_qd8_quantization_params quantization_params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
    $else:
      const ${PARAMS_TYPE} params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
  assert(mr != 0);
  assert(mr <= ${MR});
  assert(nc != 0);
  assert(kc != 0);
  assert(ks != 0);
  assert(ks % (${MR} * sizeof(void*)) == 0);
  assert(a_offset % sizeof(${XINT8_T}) == 0);
  assert(a != NULL);
  assert(w != NULL);
  assert(c != NULL);

  ${OUT_T}* c0 = c;
  $for M in range(1, MR):
    ${OUT_T}* c${M} = (${OUT_T}*) ((uintptr_t) c${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};
      }

  kc = round_up_po2(kc, 8 * sizeof(${XINT8_T}));
  $if DATATYPE == "QD8":
    const v128_t vinput_scale = wasm_v128_load32_splat(&quantization_params->inv_scale);
    const v128_t vinput_zero_point = wasm_v128_load32_splat(&quantization_params->zero_point);
    const v128_t vmin = wasm_v128_load32_splat(&params->scalar.min);
    const v128_t vmax = wasm_v128_load32_splat(&params->scalar.max);
    XNN_FORCE_REALIZATION(vmin);
    XNN_FORCE_REALIZATION(vmax);
  $else:
    $if DATATYPE != "QC8":
      const v128_t vscale = wasm_v128_load32_splat(&params->${PARAMS_STRUCT}.scale);
      XNN_FORCE_REALIZATION(vscale);

    const v128_t vmagic_bias = wasm_f32x4_const_splat(12582912.0f);
    const int32_t output_min_less_zero_point = (int32_t) params->${PARAMS_STRUCT}.output_min - (int32_t) params->${PARAMS_STRUCT}.output_zero_point;
    const v128_t vmagic_min = wasm_i32x4_splat((int32_t) float_as_uint32(12582912.0f + output_min_less_zero_point));
    const v128_t vmagic_bias_less_output_zero_point = wasm_i32x4_splat(INT32_C(0x4B400000) - (int32_t) params->${PARAMS_STRUCT}.output_zero_point);
    const v128_t voutput_max = wasm_i8x16_splat(params->${PARAMS_STRUCT}.output_max);
    XNN_FORCE_REALIZATION(vmagic_bias);
    XNN_FORCE_REALIZATION(vmagic_min);
    XNN_FORCE_REALIZATION(vmagic_bias_less_output_zero_point);
    XNN_FORCE_REALIZATION(voutput_max);

  do {
    $if DATATYPE == "QD8":
      const v128_t vksum0123 = wasm_v128_load(w);
      $for M in range(MR):
        v128_t vacc${M}x0123 = wasm_i32x4_mul(vksum0123, vinput_zero_point);
    $else:
      v128_t vacc0x0123 = wasm_v128_load(w);
      $for M in range(1, MR):
        v128_t vacc${M}x0123 = vacc0x0123;
    w = (const void*) ((const int32_t*) w + 4);

    size_t p = ks;
    do {
      $for M in range(MR):
        const ${XINT8_T}* restrict a${M} = a[${M}];
        if XNN_UNPREDICTABLE(a${M} != zero) {
          a${M} = (const ${XINT8_T}*) ((uintptr_t) a${M} + a_offset);
        $if DATATYPE == "QD8":
          } else {
            a${M} = zero_data;
        }
      a += ${MR};

      $if DATATYPE == "QU8":
        const v128_t vb_zero_point = wasm_i16x8_splat(params->${PARAMS_STRUCT}.kernel_zero_point);
      size_t k = kc;
      do {
        $for M in range(MR):
          v128_t vxa${M} = ${WASM_X16X8_LOAD8X8}(a${M});
          a${M} += 8;

        $if VARIANT == "LD128":
          $for K in range(0, 4, 2):
            $if K == 0:
              const v128_t vb${K}${K+1} = wasm_v128_load(w);
            $else:
              const v128_t vb${K}${K+1} = wasm_v128_load((const ${XINT8_T}*) w + ${K * 8});
            $if DATATYPE == "QU8":
              const v128_t vxb${K} = wasm_i16x8_sub(wasm_u16x8_extend_low_u8x16(vb${K}${K+1}), vb_zero_point);
              const v128_t vxb${K+1} = wasm_i16x8_sub(wasm_u16x8_extend_high_u8x16(vb${K}${K+1}), vb_zero_point);
            $else:
              const v128_t vxb${K} = wasm_i16x8_extend_low_i8x16(vb${K}${K+1});
              const v128_t vxb${K+1} = wasm_i16x8_extend_high_i8x16(vb${K}${K+1});

            $for M in range(MR):
              vacc${M}x0123 = wasm_i32x4_add(vacc${M}x0123, wasm_i32x4_dot_i16x8(vxa${M}, vxb${K}));
              vxa${M} = wasm_v32x4_shuffle(vxa${M}, vxa${M}, 1, 2, 3, 4);

            $for M in range(MR):
              vacc${M}x0123 = wasm_i32x4_add(vacc${M}x0123, wasm_i32x4_dot_i16x8(vxa${M}, vxb${K+1}));
              $if K + 2 != 4:
                vxa${M} = wasm_v32x4_shuffle(vxa${M}, vxa${M}, 1, 2, 3, 4);
        $else:
          $for K in range(4):
            $if K == 0:
              $if DATATYPE == "QU8":
                const v128_t vxb${K} = wasm_i16x8_sub(wasm_u16x8_load8x8(w), vb_zero_point);
              $else:
                const v128_t vxb${K} = wasm_i16x8_load8x8(w);
            $else:
              $if DATATYPE == "QU8":
                const v128_t vxb${K} = wasm_i16x8_sub(wasm_u16x8_load8x8((const ${XINT8_T}*) w + ${K * 8}), vb_zero_point);
              $else:
                const v128_t vxb${K} = wasm_i16x8_load8x8((const ${XINT8_T}*) w + ${K * 8});

            $for M in range(MR):
              vacc${M}x0123 = wasm_i32x4_add(vacc${M}x0123, wasm_i32x4_dot_i16x8(vxa${M}, vxb${K}));
              $if K + 1 != 4:
                vxa${M} = wasm_v32x4_shuffle(vxa${M}, vxa${M}, 1, 2, 3, 4);

        w = (const ${XINT8_T}*) w + 32;
        k -= 8 * sizeof(${XINT8_T});
      } while (k != 0);
      p -= ${MR} * sizeof(void*);
    } while (p != 0);

    $for M in range(MR):
      vacc${M}x0123 = wasm_f32x4_convert_i32x4(vacc${M}x0123);

    $if DATATYPE == "QD8":
      $for M in range(MR):
        vacc${M}x0123 = wasm_f32x4_mul(vacc${M}x0123, vinput_scale);

      const v128_t vfilter_output_scale0123 = wasm_v128_load(w);
      $for M in range(MR):
        vacc${M}x0123 = wasm_f32x4_mul(vacc${M}x0123, vfilter_output_scale0123);
      w = (const float*) w + 4;

      const v128_t vbias0123 = wasm_v128_load(w);
      $for M in range(MR):
        vacc${M}x0123 = wasm_f32x4_add(vacc${M}x0123, vbias0123);
      w = (const float*) w + 4;

      $for M in range(MR):
        vacc${M}x0123 = wasm_f32x4_pmax(vacc${M}x0123, vmin);

      $for M in range(MR):
        vacc${M}x0123 = wasm_f32x4_pmin(vacc${M}x0123, vmax);

      if XNN_LIKELY(nc >= 4) {
        $for M in reversed(range(MR)):
          wasm_v128_store(c${M}, vacc${M}x0123);

        a = (const ${XINT8_T}**restrict) ((uintptr_t) a - ks);

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

        nc -= 4;
      } else {
        if (nc & 2) {
          $for M in reversed(range(MR)):
            wasm_v128_store64_lane(c${M}, vacc${M}x0123, 0);
            vacc${M}x0123 = wasm_v64x2_shuffle(vacc${M}x0123, vacc${M}x0123, 1, 1);
            c${M} += 2;
        }
        if (nc & 1) {
          $for M in reversed(range(MR)):
            wasm_v128_store32_lane(c${M}, vacc${M}x0123, 0);
        }
        nc = 0;
      }
    $else:
      $if DATATYPE == "QC8":
        const v128_t vscale0123 = wasm_v128_load(w);
        w = (const float*) w + 4;
        $for M in range(MR):
          vacc${M}x0123 = wasm_f32x4_mul(vacc${M}x0123, vscale0123);
      $else:
        $for M in range(MR):
          vacc${M}x0123 = wasm_f32x4_mul(vacc${M}x0123, vscale);

      $for M in range(MR):
        vacc${M}x0123 = wasm_f32x4_add(vacc${M}x0123, vmagic_bias);

      $for M in range(MR):
        vacc${M}x0123 = wasm_i32x4_max(vacc${M}x0123, vmagic_min);

      $for M in range(MR):
        vacc${M}x0123 = wasm_i32x4_sub(vacc${M}x0123, vmagic_bias_less_output_zero_point);

      $for M in range(0, MR, 2):
        v128_t vacc${M}${min(M+1, MR-1)}x0123 = wasm_i16x8_narrow_i32x4(vacc${M}x0123, vacc${min(M+1, MR-1)}x0123);

      $if MR > 2:
        v128_t vout = ${WASM_X8X16_NARROW_I16X8}(vacc0${min(1, MR-1)}x0123, vacc${min(2, MR-1)}${min(3, MR-1)}x0123);
      $else:
        v128_t vout = ${WASM_X8X16_NARROW_I16X8}(vacc0${min(1, MR-1)}x0123, vacc0${min(1, MR-1)}x0123);

      vout = ${WASM_X8X16_MIN}(vout, voutput_max);

      if (nc >= 4) {
        $for M in reversed(range(MR)):
          wasm_v128_store32_lane(c${M}, vout, ${M});

        $for M in reversed(range(MR)):
          c${M} = (${XINT8_T}*) ((uintptr_t) c${M} + cn_stride);

        a = (const ${XINT8_T}**restrict) ((uintptr_t) a - ks);

        nc -= 4;
      } else {
        if (nc & 2) {
          $for M in reversed(range(MR)):
            wasm_v128_store16_lane(c${M}, vout, ${2 * M});
            c${M} += 2;

          vout = wasm_u32x4_shr(vout, 16);
        }
        if (nc & 1) {
          $for M in reversed(range(MR)):
            wasm_v128_store8_lane(c${M}, vout, ${4 * M});
        }

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