v43 = a1;
  v4 = a1;
  v5 = *(_QWORD *)(*MK_FP(__GS__, 0x58i64) + 8i64 * (unsigned int)TlsIndex);
  vertexBlock2 = vertexBlock;
  v7 = blockSize;
  v33 = *(_QWORD *)(*MK_FP(__GS__, 0x58i64) + 8i64 * (unsigned int)TlsIndex);
  if ( *(_DWORD *)(v5 + 0xB28) && vertexSize )
  {
    vertexCount = *(_DWORD *)blockSize / vertexSize;
    v9 = vertexCount;
    v10 = 0xC * vertexCount;
    DstSize_4 = 0xC * vertexCount;
    DstSize = vertexSize - 8;
    v11 = vertexCount * (vertexSize - 8);
    v29 = vertexCount * (vertexSize - 8);
    if ( dword_14371AF00 != 2 )
      sub_141AACC30((__int64)&g_mainHeap, (volatile signed __int32 *)&dword_14371AF00);
    v12 = (unsigned int)v10;
    MaxCount = (unsigned int)v10;
    v13 = sub_141AABC60((__int64)&g_mainHeap);
    vertexDest = sub_141AB1750(v13, (unsigned int)v10, 8ui64);
    if ( dword_14371AF00 != 2 )
      sub_141AACC30((__int64)&g_mainHeap, (volatile signed __int32 *)&dword_14371AF00);
    v15 = 2 * v11;
    v16 = sub_141AABC60((__int64)&g_mainHeap);
    v17 = sub_141AB1750(v16, (unsigned int)v15, 8ui64);
    v18 = v17;
    v34 = v17;
    if ( vertexBlock2 )
    {
      vertexDest1 = vertexDest;
      vertexBlock1 = vertexBlock2;
      v21 = (void *)v17;
      if ( (_DWORD)v9 )
      {
        do
        {
          memcpy_s((void *)vertexDest1, 8ui64, vertexBlock1, 8ui64);
          *(_BYTE *)(vertexDest1 + 8) = 0;
          v22 = (char *)vertexBlock1 + 8;
          vertexDest1 += 0xCi64;
          memcpy_s(v21, DstSize, v22, DstSize);
          vertexBlock1 = (char *)v22 + DstSize;
          v21 = (char *)v21 + DstSize;
          --v9;
        }
        while ( v9 );
        v18 = v34;
      }
      v12 = MaxCount;
    }
    else
    {
      memset((void *)vertexDest, 0, v12);
      memset((void *)v18, 0, v15);
    }
    v37 = v29;
    v23 = *(_BYTE *)(v33 + 0x1534);
    v36 = 0;
    v38 = v23;
    v24 = sub_141CDA720(*(_QWORD *)(v43 + 0x18), (__int64)&v35, (const void *)v18);
    *(_DWORD *)v7 = DstSize_4;
    if ( vertexBlock2 )
      memcpy_s(vertexBlock2, v12, (const void *)vertexDest, v12);
    if ( dword_14371AF00 != 2 )
      sub_141AACC30((__int64)&g_mainHeap, (volatile signed __int32 *)&dword_14371AF00);
    v25 = sub_141AABC60((__int64)&g_mainHeap);
    sub_141AB1D60(v25, v18);
    if ( dword_14371AF00 != 2 )
      sub_141AACC30((__int64)&g_mainHeap, (volatile signed __int32 *)&dword_14371AF00);
    v26 = sub_141AABC60((__int64)&g_mainHeap);
    sub_141AB1D60(v26, vertexDest);
    result = v24;
  }
  else if ( *(_DWORD *)blockSize )
  {
    v41 = *(_DWORD *)blockSize;
    v28 = *(_BYTE *)(v5 + 0x1534);
    v40 = 0;
    v42 = v28;
    result = sub_141CDA720(*(_QWORD *)(v4 + 0x18), (__int64)&v39, vertexBlock);
    *(_DWORD *)v7 = 0;
  }
  else
  {
    if ( !(dword_146349440 & 1) )
    {
      dword_146349420 = -1;
      dword_146349440 |= 1u;
      qword_146349424 = 0i64;
      qword_14634942C = 0i64;
      qword_146349434 = 0i64;
      _mm_store_si128((__m128i *)&xmmword_1463493F0, 0i64);
      _mm_store_si128((__m128i *)&xmmword_146349410, 0i64);
      _mm_store_si128((__m128i *)&xmmword_146349400, 0i64);
      word_14634943C = 0;
      byte_14634943E = 0;
    }
    HIDWORD(qword_146349424) = -1;
    result = (__int64)&xmmword_1463493F0;
  }
  return result;
}