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/*
 * WASM SIMD128 GEMM micro-kernel, 4x4 register tile.
 *
 * Packed-data contract matches generic gemmkernel_4x4.c / tcopy_4 / ncopy_4:
 * A panel is [A(r0,k)..A(r3,k)] per k; B panel is [B(k,c0)..B(k,c3)] per k.
 */

#include "common.h"
#include "../generic/conversion_macros.h"

#if defined(__wasm_simd128__)
#include <wasm_simd128.h>
#if defined(__wasm_relaxed_simd__)
#define MADD_F32(a, b, c) wasm_f32x4_relaxed_madd((a), (b), (c))
#define MADD_F64(a, b, c) wasm_f64x2_relaxed_madd((a), (b), (c))
#else
#define MADD_F32(a, b, c) wasm_f32x4_add((c), wasm_f32x4_mul((a), (b)))
#define MADD_F64(a, b, c) wasm_f64x2_add((c), wasm_f64x2_mul((a), (b)))
#endif
#endif

#ifdef BGEMM
#define C_TO_F32 TO_F32
#else
#define C_TO_F32
#endif

int CNAME(BLASLONG bm, BLASLONG bn, BLASLONG bk, FLOAT alpha, IFLOAT *ba,
          IFLOAT *bb, FLOAT *C, BLASLONG ldc
#ifdef TRMMKERNEL
          ,
          BLASLONG offset
#endif
) {
  BLASLONG i, j, k;
  FLOAT *C0, *C1, *C2, *C3;
  IFLOAT *ptrba, *ptrbb;
  FLOAT r0c0, r1c0, r2c0, r3c0;
  FLOAT r0c1, r1c1, r2c1, r3c1;
  FLOAT r0c2, r1c2, r2c2, r3c2;
  FLOAT r0c3, r1c3, r2c3, r3c3;
  IFLOAT a0, a1, a2, a3, b0, b1, b2, b3;

  for (j = 0; j < bn / 4; j += 1) {
    C0 = C;
    C1 = C0 + ldc;
    C2 = C1 + ldc;
    C3 = C2 + ldc;
    ptrba = ba;

    for (i = 0; i < bm / 4; i += 1) {
      ptrbb = bb;
#if defined(__wasm_simd128__) && !defined(BGEMM)
#ifndef DOUBLE
      {
        v128_t acc0 = wasm_f32x4_splat(0.0f);
        v128_t acc1 = wasm_f32x4_splat(0.0f);
        v128_t acc2 = wasm_f32x4_splat(0.0f);
        v128_t acc3 = wasm_f32x4_splat(0.0f);
        for (k = 0; k < bk; k += 1) {
          v128_t va = wasm_v128_load(ptrba);
          v128_t vb = wasm_v128_load(ptrbb);
          v128_t vb0 = wasm_i32x4_shuffle(vb, vb, 0, 0, 0, 0);
          v128_t vb1 = wasm_i32x4_shuffle(vb, vb, 1, 1, 1, 1);
          v128_t vb2 = wasm_i32x4_shuffle(vb, vb, 2, 2, 2, 2);
          v128_t vb3 = wasm_i32x4_shuffle(vb, vb, 3, 3, 3, 3);
          acc0 = MADD_F32(va, vb0, acc0);
          acc1 = MADD_F32(va, vb1, acc1);
          acc2 = MADD_F32(va, vb2, acc2);
          acc3 = MADD_F32(va, vb3, acc3);
          ptrba += 4;
          ptrbb += 4;
        }
        v128_t valpha = wasm_f32x4_splat(alpha);
        wasm_v128_store(C0, MADD_F32(acc0, valpha, wasm_v128_load(C0)));
        wasm_v128_store(C1, MADD_F32(acc1, valpha, wasm_v128_load(C1)));
        wasm_v128_store(C2, MADD_F32(acc2, valpha, wasm_v128_load(C2)));
        wasm_v128_store(C3, MADD_F32(acc3, valpha, wasm_v128_load(C3)));
      }
#else
      {
        v128_t a0l = wasm_f64x2_splat(0.0), a0h = wasm_f64x2_splat(0.0);
        v128_t a1l = wasm_f64x2_splat(0.0), a1h = wasm_f64x2_splat(0.0);
        v128_t a2l = wasm_f64x2_splat(0.0), a2h = wasm_f64x2_splat(0.0);
        v128_t a3l = wasm_f64x2_splat(0.0), a3h = wasm_f64x2_splat(0.0);
        for (k = 0; k < bk; k += 1) {
          v128_t va01 = wasm_v128_load(ptrba);
          v128_t va23 = wasm_v128_load(ptrba + 2);
          v128_t vb01 = wasm_v128_load(ptrbb);
          v128_t vb23 = wasm_v128_load(ptrbb + 2);
          v128_t b0v = wasm_i64x2_shuffle(vb01, vb01, 0, 0);
          v128_t b1v = wasm_i64x2_shuffle(vb01, vb01, 1, 1);
          v128_t b2v = wasm_i64x2_shuffle(vb23, vb23, 0, 0);
          v128_t b3v = wasm_i64x2_shuffle(vb23, vb23, 1, 1);
          a0l = MADD_F64(va01, b0v, a0l);
          a0h = MADD_F64(va23, b0v, a0h);
          a1l = MADD_F64(va01, b1v, a1l);
          a1h = MADD_F64(va23, b1v, a1h);
          a2l = MADD_F64(va01, b2v, a2l);
          a2h = MADD_F64(va23, b2v, a2h);
          a3l = MADD_F64(va01, b3v, a3l);
          a3h = MADD_F64(va23, b3v, a3h);
          ptrba += 4;
          ptrbb += 4;
        }
        v128_t valpha = wasm_f64x2_splat(alpha);
        wasm_v128_store(C0, MADD_F64(a0l, valpha, wasm_v128_load(C0)));
        wasm_v128_store(C0 + 2, MADD_F64(a0h, valpha, wasm_v128_load(C0 + 2)));
        wasm_v128_store(C1, MADD_F64(a1l, valpha, wasm_v128_load(C1)));
        wasm_v128_store(C1 + 2, MADD_F64(a1h, valpha, wasm_v128_load(C1 + 2)));
        wasm_v128_store(C2, MADD_F64(a2l, valpha, wasm_v128_load(C2)));
        wasm_v128_store(C2 + 2, MADD_F64(a2h, valpha, wasm_v128_load(C2 + 2)));
        wasm_v128_store(C3, MADD_F64(a3l, valpha, wasm_v128_load(C3)));
        wasm_v128_store(C3 + 2, MADD_F64(a3h, valpha, wasm_v128_load(C3 + 2)));
      }
#endif
#else
      r0c0 = r1c0 = r2c0 = r3c0 = 0;
      r0c1 = r1c1 = r2c1 = r3c1 = 0;
      r0c2 = r1c2 = r2c2 = r3c2 = 0;
      r0c3 = r1c3 = r2c3 = r3c3 = 0;
      for (k = 0; k < bk; k += 1) {
        b0 = ptrbb[0];
        b1 = ptrbb[1];
        b2 = ptrbb[2];
        b3 = ptrbb[3];
        a0 = ptrba[0];
        a1 = ptrba[1];
        a2 = ptrba[2];
        a3 = ptrba[3];
        r0c0 += TO_F32(a0) * TO_F32(b0);
        r1c0 += TO_F32(a1) * TO_F32(b0);
        r2c0 += TO_F32(a2) * TO_F32(b0);
        r3c0 += TO_F32(a3) * TO_F32(b0);
        r0c1 += TO_F32(a0) * TO_F32(b1);
        r1c1 += TO_F32(a1) * TO_F32(b1);
        r2c1 += TO_F32(a2) * TO_F32(b1);
        r3c1 += TO_F32(a3) * TO_F32(b1);
        r0c2 += TO_F32(a0) * TO_F32(b2);
        r1c2 += TO_F32(a1) * TO_F32(b2);
        r2c2 += TO_F32(a2) * TO_F32(b2);
        r3c2 += TO_F32(a3) * TO_F32(b2);
        r0c3 += TO_F32(a0) * TO_F32(b3);
        r1c3 += TO_F32(a1) * TO_F32(b3);
        r2c3 += TO_F32(a2) * TO_F32(b3);
        r3c3 += TO_F32(a3) * TO_F32(b3);
        ptrba += 4;
        ptrbb += 4;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0[1] = TO_OUTPUT(C_TO_F32(C0[1]) + r1c0 * ALPHA);
      C0[2] = TO_OUTPUT(C_TO_F32(C0[2]) + r2c0 * ALPHA);
      C0[3] = TO_OUTPUT(C_TO_F32(C0[3]) + r3c0 * ALPHA);
      C1[0] = TO_OUTPUT(C_TO_F32(C1[0]) + r0c1 * ALPHA);
      C1[1] = TO_OUTPUT(C_TO_F32(C1[1]) + r1c1 * ALPHA);
      C1[2] = TO_OUTPUT(C_TO_F32(C1[2]) + r2c1 * ALPHA);
      C1[3] = TO_OUTPUT(C_TO_F32(C1[3]) + r3c1 * ALPHA);
      C2[0] = TO_OUTPUT(C_TO_F32(C2[0]) + r0c2 * ALPHA);
      C2[1] = TO_OUTPUT(C_TO_F32(C2[1]) + r1c2 * ALPHA);
      C2[2] = TO_OUTPUT(C_TO_F32(C2[2]) + r2c2 * ALPHA);
      C2[3] = TO_OUTPUT(C_TO_F32(C2[3]) + r3c2 * ALPHA);
      C3[0] = TO_OUTPUT(C_TO_F32(C3[0]) + r0c3 * ALPHA);
      C3[1] = TO_OUTPUT(C_TO_F32(C3[1]) + r1c3 * ALPHA);
      C3[2] = TO_OUTPUT(C_TO_F32(C3[2]) + r2c3 * ALPHA);
      C3[3] = TO_OUTPUT(C_TO_F32(C3[3]) + r3c3 * ALPHA);
#endif
      C0 += 4;
      C1 += 4;
      C2 += 4;
      C3 += 4;
    }

    if (bm & 2) {
      ptrbb = bb;
      r0c0 = r1c0 = 0;
      r0c1 = r1c1 = 0;
      r0c2 = r1c2 = 0;
      r0c3 = r1c3 = 0;
      for (k = 0; k < bk; k += 1) {
        b0 = ptrbb[0];
        b1 = ptrbb[1];
        b2 = ptrbb[2];
        b3 = ptrbb[3];
        a0 = ptrba[0];
        a1 = ptrba[1];
        r0c0 += TO_F32(a0) * TO_F32(b0);
        r1c0 += TO_F32(a1) * TO_F32(b0);
        r0c1 += TO_F32(a0) * TO_F32(b1);
        r1c1 += TO_F32(a1) * TO_F32(b1);
        r0c2 += TO_F32(a0) * TO_F32(b2);
        r1c2 += TO_F32(a1) * TO_F32(b2);
        r0c3 += TO_F32(a0) * TO_F32(b3);
        r1c3 += TO_F32(a1) * TO_F32(b3);
        ptrba += 2;
        ptrbb += 4;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0[1] = TO_OUTPUT(C_TO_F32(C0[1]) + r1c0 * ALPHA);
      C1[0] = TO_OUTPUT(C_TO_F32(C1[0]) + r0c1 * ALPHA);
      C1[1] = TO_OUTPUT(C_TO_F32(C1[1]) + r1c1 * ALPHA);
      C2[0] = TO_OUTPUT(C_TO_F32(C2[0]) + r0c2 * ALPHA);
      C2[1] = TO_OUTPUT(C_TO_F32(C2[1]) + r1c2 * ALPHA);
      C3[0] = TO_OUTPUT(C_TO_F32(C3[0]) + r0c3 * ALPHA);
      C3[1] = TO_OUTPUT(C_TO_F32(C3[1]) + r1c3 * ALPHA);
      C0 += 2;
      C1 += 2;
      C2 += 2;
      C3 += 2;
    }
    if (bm & 1) {
      ptrbb = bb;
      r0c0 = r0c1 = r0c2 = r0c3 = 0;
      for (k = 0; k < bk; k += 1) {
        a0 = ptrba[0];
        r0c0 += TO_F32(a0) * TO_F32(ptrbb[0]);
        r0c1 += TO_F32(a0) * TO_F32(ptrbb[1]);
        r0c2 += TO_F32(a0) * TO_F32(ptrbb[2]);
        r0c3 += TO_F32(a0) * TO_F32(ptrbb[3]);
        ptrba += 1;
        ptrbb += 4;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C1[0] = TO_OUTPUT(C_TO_F32(C1[0]) + r0c1 * ALPHA);
      C2[0] = TO_OUTPUT(C_TO_F32(C2[0]) + r0c2 * ALPHA);
      C3[0] = TO_OUTPUT(C_TO_F32(C3[0]) + r0c3 * ALPHA);
      C0 += 1;
      C1 += 1;
      C2 += 1;
      C3 += 1;
    }
    bb = bb + bk * 4;
    C = C + ldc * 4;
  }

  if (bn & 2) {
    C0 = C;
    C1 = C0 + ldc;
    ptrba = ba;
    for (i = 0; i < bm / 4; i += 1) {
      ptrbb = bb;
      r0c0 = r1c0 = r2c0 = r3c0 = 0;
      r0c1 = r1c1 = r2c1 = r3c1 = 0;
      for (k = 0; k < bk; k += 1) {
        b0 = ptrbb[0];
        b1 = ptrbb[1];
        a0 = ptrba[0];
        a1 = ptrba[1];
        a2 = ptrba[2];
        a3 = ptrba[3];
        r0c0 += TO_F32(a0) * TO_F32(b0);
        r1c0 += TO_F32(a1) * TO_F32(b0);
        r2c0 += TO_F32(a2) * TO_F32(b0);
        r3c0 += TO_F32(a3) * TO_F32(b0);
        r0c1 += TO_F32(a0) * TO_F32(b1);
        r1c1 += TO_F32(a1) * TO_F32(b1);
        r2c1 += TO_F32(a2) * TO_F32(b1);
        r3c1 += TO_F32(a3) * TO_F32(b1);
        ptrba += 4;
        ptrbb += 2;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0[1] = TO_OUTPUT(C_TO_F32(C0[1]) + r1c0 * ALPHA);
      C0[2] = TO_OUTPUT(C_TO_F32(C0[2]) + r2c0 * ALPHA);
      C0[3] = TO_OUTPUT(C_TO_F32(C0[3]) + r3c0 * ALPHA);
      C1[0] = TO_OUTPUT(C_TO_F32(C1[0]) + r0c1 * ALPHA);
      C1[1] = TO_OUTPUT(C_TO_F32(C1[1]) + r1c1 * ALPHA);
      C1[2] = TO_OUTPUT(C_TO_F32(C1[2]) + r2c1 * ALPHA);
      C1[3] = TO_OUTPUT(C_TO_F32(C1[3]) + r3c1 * ALPHA);
      C0 += 4;
      C1 += 4;
    }
    if (bm & 2) {
      ptrbb = bb;
      r0c0 = r1c0 = r0c1 = r1c1 = 0;
      for (k = 0; k < bk; k += 1) {
        b0 = ptrbb[0];
        b1 = ptrbb[1];
        a0 = ptrba[0];
        a1 = ptrba[1];
        r0c0 += TO_F32(a0) * TO_F32(b0);
        r1c0 += TO_F32(a1) * TO_F32(b0);
        r0c1 += TO_F32(a0) * TO_F32(b1);
        r1c1 += TO_F32(a1) * TO_F32(b1);
        ptrba += 2;
        ptrbb += 2;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0[1] = TO_OUTPUT(C_TO_F32(C0[1]) + r1c0 * ALPHA);
      C1[0] = TO_OUTPUT(C_TO_F32(C1[0]) + r0c1 * ALPHA);
      C1[1] = TO_OUTPUT(C_TO_F32(C1[1]) + r1c1 * ALPHA);
      C0 += 2;
      C1 += 2;
    }
    if (bm & 1) {
      ptrbb = bb;
      r0c0 = r0c1 = 0;
      for (k = 0; k < bk; k += 1) {
        a0 = ptrba[0];
        r0c0 += TO_F32(a0) * TO_F32(ptrbb[0]);
        r0c1 += TO_F32(a0) * TO_F32(ptrbb[1]);
        ptrba += 1;
        ptrbb += 2;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C1[0] = TO_OUTPUT(C_TO_F32(C1[0]) + r0c1 * ALPHA);
      C0 += 1;
      C1 += 1;
    }
    bb = bb + bk * 2;
    C = C + ldc * 2;
  }

  if (bn & 1) {
    C0 = C;
    ptrba = ba;
    for (i = 0; i < bm / 4; i += 1) {
      ptrbb = bb;
      r0c0 = r1c0 = r2c0 = r3c0 = 0;
      for (k = 0; k < bk; k += 1) {
        b0 = ptrbb[0];
        a0 = ptrba[0];
        a1 = ptrba[1];
        a2 = ptrba[2];
        a3 = ptrba[3];
        r0c0 += TO_F32(a0) * TO_F32(b0);
        r1c0 += TO_F32(a1) * TO_F32(b0);
        r2c0 += TO_F32(a2) * TO_F32(b0);
        r3c0 += TO_F32(a3) * TO_F32(b0);
        ptrba += 4;
        ptrbb += 1;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0[1] = TO_OUTPUT(C_TO_F32(C0[1]) + r1c0 * ALPHA);
      C0[2] = TO_OUTPUT(C_TO_F32(C0[2]) + r2c0 * ALPHA);
      C0[3] = TO_OUTPUT(C_TO_F32(C0[3]) + r3c0 * ALPHA);
      C0 += 4;
    }
    if (bm & 2) {
      ptrbb = bb;
      r0c0 = r1c0 = 0;
      for (k = 0; k < bk; k += 1) {
        b0 = ptrbb[0];
        a0 = ptrba[0];
        a1 = ptrba[1];
        r0c0 += TO_F32(a0) * TO_F32(b0);
        r1c0 += TO_F32(a1) * TO_F32(b0);
        ptrba += 2;
        ptrbb += 1;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0[1] = TO_OUTPUT(C_TO_F32(C0[1]) + r1c0 * ALPHA);
      C0 += 2;
    }
    if (bm & 1) {
      ptrbb = bb;
      r0c0 = 0;
      for (k = 0; k < bk; k += 1) {
        r0c0 += TO_F32(ptrba[0]) * TO_F32(ptrbb[0]);
        ptrba += 1;
        ptrbb += 1;
      }
      C0[0] = TO_OUTPUT(C_TO_F32(C0[0]) + r0c0 * ALPHA);
      C0 += 1;
    }
  }

  return 0;
}