// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// MIPS version of speed-critical encoding functions.
//
// Author(s): Djordje Pesut    (djordje.pesut@imgtec.com)
//            Jovan Zelincevic (jovan.zelincevic@imgtec.com)
//            Slobodan Prijic  (slobodan.prijic@imgtec.com)

#include "./dsp.h"

#if defined(WEBP_USE_MIPS32)

#include "./mips_macro.h"
#include "../enc/vp8i_enc.h"
#include "../enc/cost_enc.h"

static const int kC1 = 20091 + (1 << 16);
static const int kC2 = 35468;

// macro for one vertical pass in ITransformOne
// MUL macro inlined
// temp0..temp15 holds tmp[0]..tmp[15]
// A..D - offsets in bytes to load from in buffer
// TEMP0..TEMP3 - registers for corresponding tmp elements
// TEMP4..TEMP5 - temporary registers
#define VERTICAL_PASS(A, B, C, D, TEMP4, TEMP0, TEMP1, TEMP2, TEMP3)        \
  "lh      %[temp16],      " #A "(%[temp20])                 \n\t"          \
  "lh      %[temp18],      " #B "(%[temp20])                 \n\t"          \
  "lh      %[temp17],      " #C "(%[temp20])                 \n\t"          \
  "lh      %[temp19],      " #D "(%[temp20])                 \n\t"          \
  "addu    %[" #TEMP4 "],    %[temp16],      %[temp18]       \n\t"          \
  "subu    %[temp16],      %[temp16],      %[temp18]         \n\t"          \
  "mul     %[" #TEMP0 "],    %[temp17],      %[kC2]          \n\t"          \
  "mul     %[temp18],      %[temp19],      %[kC1]            \n\t"          \
  "mul     %[temp17],      %[temp17],      %[kC1]            \n\t"          \
  "mul     %[temp19],      %[temp19],      %[kC2]            \n\t"          \
  "sra     %[" #TEMP0 "],    %[" #TEMP0 "],    16            \n\n"          \
  "sra     %[temp18],      %[temp18],      16                \n\n"          \
  "sra     %[temp17],      %[temp17],      16                \n\n"          \
  "sra     %[temp19],      %[temp19],      16                \n\n"          \
  "subu    %[" #TEMP2 "],    %[" #TEMP0 "],    %[temp18]     \n\t"          \
  "addu    %[" #TEMP3 "],    %[temp17],      %[temp19]       \n\t"          \
  "addu    %[" #TEMP0 "],    %[" #TEMP4 "],    %[" #TEMP3 "] \n\t"          \
  "addu    %[" #TEMP1 "],    %[temp16],      %[" #TEMP2 "]   \n\t"          \
  "subu    %[" #TEMP2 "],    %[temp16],      %[" #TEMP2 "]   \n\t"          \
  "subu    %[" #TEMP3 "],    %[" #TEMP4 "],    %[" #TEMP3 "] \n\t"

// macro for one horizontal pass in ITransformOne
// MUL and STORE macros inlined
// a = clip_8b(a) is replaced with: a = max(a, 0); a = min(a, 255)
// temp0..temp15 holds tmp[0]..tmp[15]
// A - offset in bytes to load from ref and store to dst buffer
// TEMP0, TEMP4, TEMP8 and TEMP12 - registers for corresponding tmp elements
#define HORIZONTAL_PASS(A, TEMP0, TEMP4, TEMP8, TEMP12)                       \
  "addiu   %[" #TEMP0 "],    %[" #TEMP0 "],    4               \n\t"          \
  "addu    %[temp16],      %[" #TEMP0 "],    %[" #TEMP8 "]     \n\t"          \
  "subu    %[temp17],      %[" #TEMP0 "],    %[" #TEMP8 "]     \n\t"          \
  "mul     %[" #TEMP0 "],    %[" #TEMP4 "],    %[kC2]          \n\t"          \
  "mul     %[" #TEMP8 "],    %[" #TEMP12 "],   %[kC1]          \n\t"          \
  "mul     %[" #TEMP4 "],    %[" #TEMP4 "],    %[kC1]          \n\t"          \
  "mul     %[" #TEMP12 "],   %[" #TEMP12 "],   %[kC2]          \n\t"          \
  "sra     %[" #TEMP0 "],    %[" #TEMP0 "],    16              \n\t"          \
  "sra     %[" #TEMP8 "],    %[" #TEMP8 "],    16              \n\t"          \
  "sra     %[" #TEMP4 "],    %[" #TEMP4 "],    16              \n\t"          \
  "sra     %[" #TEMP12 "],   %[" #TEMP12 "],   16              \n\t"          \
  "subu    %[temp18],      %[" #TEMP0 "],    %[" #TEMP8 "]     \n\t"          \
  "addu    %[temp19],      %[" #TEMP4 "],    %[" #TEMP12 "]    \n\t"          \
  "addu    %[" #TEMP0 "],    %[temp16],      %[temp19]         \n\t"          \
  "addu    %[" #TEMP4 "],    %[temp17],      %[temp18]         \n\t"          \
  "subu    %[" #TEMP8 "],    %[temp17],      %[temp18]         \n\t"          \
  "subu    %[" #TEMP12 "],   %[temp16],      %[temp19]         \n\t"          \
  "lw      %[temp20],      0(%[args])                          \n\t"          \
  "sra     %[" #TEMP0 "],    %[" #TEMP0 "],    3               \n\t"          \
  "sra     %[" #TEMP4 "],    %[" #TEMP4 "],    3               \n\t"          \
  "sra     %[" #TEMP8 "],    %[" #TEMP8 "],    3               \n\t"          \
  "sra     %[" #TEMP12 "],   %[" #TEMP12 "],   3               \n\t"          \
  "lbu     %[temp16],      0+" XSTR(BPS) "*" #A "(%[temp20])   \n\t"          \
  "lbu     %[temp17],      1+" XSTR(BPS) "*" #A "(%[temp20])   \n\t"          \
  "lbu     %[temp18],      2+" XSTR(BPS) "*" #A "(%[temp20])   \n\t"          \
  "lbu     %[temp19],      3+" XSTR(BPS) "*" #A "(%[temp20])   \n\t"          \
  "addu    %[" #TEMP0 "],    %[temp16],      %[" #TEMP0 "]     \n\t"          \
  "addu    %[" #TEMP4 "],    %[temp17],      %[" #TEMP4 "]     \n\t"          \
  "addu    %[" #TEMP8 "],    %[temp18],      %[" #TEMP8 "]     \n\t"          \
  "addu    %[" #TEMP12 "],   %[temp19],      %[" #TEMP12 "]    \n\t"          \
  "slt     %[temp16],      %[" #TEMP0 "],    $zero             \n\t"          \
  "slt     %[temp17],      %[" #TEMP4 "],    $zero             \n\t"          \
  "slt     %[temp18],      %[" #TEMP8 "],    $zero             \n\t"          \
  "slt     %[temp19],      %[" #TEMP12 "],   $zero             \n\t"          \
  "movn    %[" #TEMP0 "],    $zero,          %[temp16]         \n\t"          \
  "movn    %[" #TEMP4 "],    $zero,          %[temp17]         \n\t"          \
  "movn    %[" #TEMP8 "],    $zero,          %[temp18]         \n\t"          \
  "movn    %[" #TEMP12 "],   $zero,          %[temp19]         \n\t"          \
  "addiu   %[temp20],      $zero,          255                 \n\t"          \
  "slt     %[temp16],      %[" #TEMP0 "],    %[temp20]         \n\t"          \
  "slt     %[temp17],      %[" #TEMP4 "],    %[temp20]         \n\t"          \
  "slt     %[temp18],      %[" #TEMP8 "],    %[temp20]         \n\t"          \
  "slt     %[temp19],      %[" #TEMP12 "],   %[temp20]         \n\t"          \
  "movz    %[" #TEMP0 "],    %[temp20],      %[temp16]         \n\t"          \
  "movz    %[" #TEMP4 "],    %[temp20],      %[temp17]         \n\t"          \
  "lw      %[temp16],      8(%[args])                          \n\t"          \
  "movz    %[" #TEMP8 "],    %[temp20],      %[temp18]         \n\t"          \
  "movz    %[" #TEMP12 "],   %[temp20],      %[temp19]         \n\t"          \
  "sb      %[" #TEMP0 "],    0+" XSTR(BPS) "*" #A "(%[temp16]) \n\t"          \
  "sb      %[" #TEMP4 "],    1+" XSTR(BPS) "*" #A "(%[temp16]) \n\t"          \
  "sb      %[" #TEMP8 "],    2+" XSTR(BPS) "*" #A "(%[temp16]) \n\t"          \
  "sb      %[" #TEMP12 "],   3+" XSTR(BPS) "*" #A "(%[temp16]) \n\t"

// Does one or two inverse transforms.
static WEBP_INLINE void ITransformOne(const uint8_t* ref, const int16_t* in,
                                      uint8_t* dst) {
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6;
  int temp7, temp8, temp9, temp10, temp11, temp12, temp13;
  int temp14, temp15, temp16, temp17, temp18, temp19, temp20;
  const int* args[3] = {(const int*)ref, (const int*)in, (const int*)dst};

  __asm__ volatile(
    "lw      %[temp20],      4(%[args])                      \n\t"
    VERTICAL_PASS(0, 16,  8, 24, temp4,  temp0,  temp1,  temp2,  temp3)
    VERTICAL_PASS(2, 18, 10, 26, temp8,  temp4,  temp5,  temp6,  temp7)
    VERTICAL_PASS(4, 20, 12, 28, temp12, temp8,  temp9,  temp10, temp11)
    VERTICAL_PASS(6, 22, 14, 30, temp20, temp12, temp13, temp14, temp15)

    HORIZONTAL_PASS(0, temp0, temp4, temp8,  temp12)
    HORIZONTAL_PASS(1, temp1, temp5, temp9,  temp13)
    HORIZONTAL_PASS(2, temp2, temp6, temp10, temp14)
    HORIZONTAL_PASS(3, temp3, temp7, temp11, temp15)

    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [temp8]"=&r"(temp8),
      [temp9]"=&r"(temp9), [temp10]"=&r"(temp10), [temp11]"=&r"(temp11),
      [temp12]"=&r"(temp12), [temp13]"=&r"(temp13), [temp14]"=&r"(temp14),
      [temp15]"=&r"(temp15), [temp16]"=&r"(temp16), [temp17]"=&r"(temp17),
      [temp18]"=&r"(temp18), [temp19]"=&r"(temp19), [temp20]"=&r"(temp20)
    : [args]"r"(args), [kC1]"r"(kC1), [kC2]"r"(kC2)
    : "memory", "hi", "lo"
  );
}

static void ITransform(const uint8_t* ref, const int16_t* in,
                       uint8_t* dst, int do_two) {
  ITransformOne(ref, in, dst);
  if (do_two) {
    ITransformOne(ref + 4, in + 16, dst + 4);
  }
}

#undef VERTICAL_PASS
#undef HORIZONTAL_PASS

// macro for one pass through for loop in QuantizeBlock
// QUANTDIV macro inlined
// J - offset in bytes (kZigzag[n] * 2)
// K - offset in bytes (kZigzag[n] * 4)
// N - offset in bytes (n * 2)
#define QUANTIZE_ONE(J, K, N)                                               \
  "lh           %[temp0],       " #J "(%[ppin])                     \n\t"   \
  "lhu          %[temp1],       " #J "(%[ppsharpen])                \n\t"   \
  "lw           %[temp2],       " #K "(%[ppzthresh])                \n\t"   \
  "sra          %[sign],        %[temp0],           15              \n\t"   \
  "xor          %[coeff],       %[temp0],           %[sign]         \n\t"   \
  "subu         %[coeff],       %[coeff],           %[sign]         \n\t"   \
  "addu         %[coeff],       %[coeff],           %[temp1]        \n\t"   \
  "slt          %[temp4],       %[temp2],           %[coeff]        \n\t"   \
  "addiu        %[temp5],       $zero,              0               \n\t"   \
  "addiu        %[level],       $zero,              0               \n\t"   \
  "beqz         %[temp4],       2f                                  \n\t"   \
  "lhu          %[temp1],       " #J "(%[ppiq])                     \n\t"   \
  "lw           %[temp2],       " #K "(%[ppbias])                   \n\t"   \
  "lhu          %[temp3],       " #J "(%[ppq])                      \n\t"   \
  "mul          %[level],       %[coeff],           %[temp1]        \n\t"   \
  "addu         %[level],       %[level],           %[temp2]        \n\t"   \
  "sra          %[level],       %[level],           17              \n\t"   \
  "slt          %[temp4],       %[max_level],       %[level]        \n\t"   \
  "movn         %[level],       %[max_level],       %[temp4]        \n\t"   \
  "xor          %[level],       %[level],           %[sign]         \n\t"   \
  "subu         %[level],       %[level],           %[sign]         \n\t"   \
  "mul          %[temp5],       %[level],           %[temp3]        \n\t"   \
"2:                                                                 \n\t"   \
  "sh           %[temp5],       " #J "(%[ppin])                     \n\t"   \
  "sh           %[level],       " #N "(%[pout])                     \n\t"

static int QuantizeBlock(int16_t in[16], int16_t out[16],
                         const VP8Matrix* const mtx) {
  int temp0, temp1, temp2, temp3, temp4, temp5;
  int sign, coeff, level, i;
  int max_level = MAX_LEVEL;

  int16_t* ppin             = &in[0];
  int16_t* pout             = &out[0];
  const uint16_t* ppsharpen = &mtx->sharpen_[0];
  const uint32_t* ppzthresh = &mtx->zthresh_[0];
  const uint16_t* ppq       = &mtx->q_[0];
  const uint16_t* ppiq      = &mtx->iq_[0];
  const uint32_t* ppbias    = &mtx->bias_[0];

  __asm__ volatile(
    QUANTIZE_ONE( 0,  0,  0)
    QUANTIZE_ONE( 2,  4,  2)
    QUANTIZE_ONE( 8, 16,  4)
    QUANTIZE_ONE(16, 32,  6)
    QUANTIZE_ONE(10, 20,  8)
    QUANTIZE_ONE( 4,  8, 10)
    QUANTIZE_ONE( 6, 12, 12)
    QUANTIZE_ONE(12, 24, 14)
    QUANTIZE_ONE(18, 36, 16)
    QUANTIZE_ONE(24, 48, 18)
    QUANTIZE_ONE(26, 52, 20)
    QUANTIZE_ONE(20, 40, 22)
    QUANTIZE_ONE(14, 28, 24)
    QUANTIZE_ONE(22, 44, 26)
    QUANTIZE_ONE(28, 56, 28)
    QUANTIZE_ONE(30, 60, 30)

    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
      [temp2]"=&r"(temp2), [temp3]"=&r"(temp3),
      [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [sign]"=&r"(sign), [coeff]"=&r"(coeff),
      [level]"=&r"(level)
    : [pout]"r"(pout), [ppin]"r"(ppin),
      [ppiq]"r"(ppiq), [max_level]"r"(max_level),
      [ppbias]"r"(ppbias), [ppzthresh]"r"(ppzthresh),
      [ppsharpen]"r"(ppsharpen), [ppq]"r"(ppq)
    : "memory", "hi", "lo"
  );

  // moved out from macro to increase possibility for earlier breaking
  for (i = 15; i >= 0; i--) {
    if (out[i]) return 1;
  }
  return 0;
}

static int Quantize2Blocks(int16_t in[32], int16_t out[32],
                           const VP8Matrix* const mtx) {
  int nz;
  nz  = QuantizeBlock(in + 0 * 16, out + 0 * 16, mtx) << 0;
  nz |= QuantizeBlock(in + 1 * 16, out + 1 * 16, mtx) << 1;
  return nz;
}

#undef QUANTIZE_ONE

// macro for one horizontal pass in Disto4x4 (TTransform)
// two calls of function TTransform are merged into single one
// A - offset in bytes to load from a and b buffers
// E..H - offsets in bytes to store first results to tmp buffer
// E1..H1 - offsets in bytes to store second results to tmp buffer
#define HORIZONTAL_PASS(A, E, F, G, H, E1, F1, G1, H1)                  \
  "lbu    %[temp0],  0+" XSTR(BPS) "*" #A "(%[a])  \n\t"                \
  "lbu    %[temp1],  1+" XSTR(BPS) "*" #A "(%[a])  \n\t"                \
  "lbu    %[temp2],  2+" XSTR(BPS) "*" #A "(%[a])  \n\t"                \
  "lbu    %[temp3],  3+" XSTR(BPS) "*" #A "(%[a])  \n\t"                \
  "lbu    %[temp4],  0+" XSTR(BPS) "*" #A "(%[b])  \n\t"                \
  "lbu    %[temp5],  1+" XSTR(BPS) "*" #A "(%[b])  \n\t"                \
  "lbu    %[temp6],  2+" XSTR(BPS) "*" #A "(%[b])  \n\t"                \
  "lbu    %[temp7],  3+" XSTR(BPS) "*" #A "(%[b])  \n\t"                \
  "addu   %[temp8],  %[temp0],    %[temp2]         \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp2]         \n\t"                \
  "addu   %[temp2],  %[temp1],    %[temp3]         \n\t"                \
  "subu   %[temp1],  %[temp1],    %[temp3]         \n\t"                \
  "addu   %[temp3],  %[temp4],    %[temp6]         \n\t"                \
  "subu   %[temp4],  %[temp4],    %[temp6]         \n\t"                \
  "addu   %[temp6],  %[temp5],    %[temp7]         \n\t"                \
  "subu   %[temp5],  %[temp5],    %[temp7]         \n\t"                \
  "addu   %[temp7],  %[temp8],    %[temp2]         \n\t"                \
  "subu   %[temp2],  %[temp8],    %[temp2]         \n\t"                \
  "addu   %[temp8],  %[temp0],    %[temp1]         \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp1]         \n\t"                \
  "addu   %[temp1],  %[temp3],    %[temp6]         \n\t"                \
  "subu   %[temp3],  %[temp3],    %[temp6]         \n\t"                \
  "addu   %[temp6],  %[temp4],    %[temp5]         \n\t"                \
  "subu   %[temp4],  %[temp4],    %[temp5]         \n\t"                \
  "sw     %[temp7],  " #E "(%[tmp])                \n\t"                \
  "sw     %[temp2],  " #H "(%[tmp])                \n\t"                \
  "sw     %[temp8],  " #F "(%[tmp])                \n\t"                \
  "sw     %[temp0],  " #G "(%[tmp])                \n\t"                \
  "sw     %[temp1],  " #E1 "(%[tmp])               \n\t"                \
  "sw     %[temp3],  " #H1 "(%[tmp])               \n\t"                \
  "sw     %[temp6],  " #F1 "(%[tmp])               \n\t"                \
  "sw     %[temp4],  " #G1 "(%[tmp])               \n\t"

// macro for one vertical pass in Disto4x4 (TTransform)
// two calls of function TTransform are merged into single one
// since only one accu is available in mips32r1 instruction set
//   first is done second call of function TTransform and after
//   that first one.
//   const int sum1 = TTransform(a, w);
//   const int sum2 = TTransform(b, w);
//   return abs(sum2 - sum1) >> 5;
//   (sum2 - sum1) is calculated with madds (sub2) and msubs (sub1)
// A..D - offsets in bytes to load first results from tmp buffer
// A1..D1 - offsets in bytes to load second results from tmp buffer
// E..H - offsets in bytes to load from w buffer
#define VERTICAL_PASS(A, B, C, D, A1, B1, C1, D1, E, F, G, H)     \
  "lw     %[temp0],  " #A1 "(%[tmp])         \n\t"                \
  "lw     %[temp1],  " #C1 "(%[tmp])         \n\t"                \
  "lw     %[temp2],  " #B1 "(%[tmp])         \n\t"                \
  "lw     %[temp3],  " #D1 "(%[tmp])         \n\t"                \
  "addu   %[temp8],  %[temp0],    %[temp1]   \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp1]   \n\t"                \
  "addu   %[temp1],  %[temp2],    %[temp3]   \n\t"                \
  "subu   %[temp2],  %[temp2],    %[temp3]   \n\t"                \
  "addu   %[temp3],  %[temp8],    %[temp1]   \n\t"                \
  "subu   %[temp8],  %[temp8],    %[temp1]   \n\t"                \
  "addu   %[temp1],  %[temp0],    %[temp2]   \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp2]   \n\t"                \
  "sra    %[temp4],  %[temp3],    31         \n\t"                \
  "sra    %[temp5],  %[temp1],    31         \n\t"                \
  "sra    %[temp6],  %[temp0],    31         \n\t"                \
  "sra    %[temp7],  %[temp8],    31         \n\t"                \
  "xor    %[temp3],  %[temp3],    %[temp4]   \n\t"                \
  "xor    %[temp1],  %[temp1],    %[temp5]   \n\t"                \
  "xor    %[temp0],  %[temp0],    %[temp6]   \n\t"                \
  "xor    %[temp8],  %[temp8],    %[temp7]   \n\t"                \
  "subu   %[temp3],  %[temp3],    %[temp4]   \n\t"                \
  "subu   %[temp1],  %[temp1],    %[temp5]   \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp6]   \n\t"                \
  "subu   %[temp8],  %[temp8],    %[temp7]   \n\t"                \
  "lhu    %[temp4],  " #E "(%[w])            \n\t"                \
  "lhu    %[temp5],  " #F "(%[w])            \n\t"                \
  "lhu    %[temp6],  " #G "(%[w])            \n\t"                \
  "lhu    %[temp7],  " #H "(%[w])            \n\t"                \
  "madd   %[temp4],  %[temp3]                \n\t"                \
  "madd   %[temp5],  %[temp1]                \n\t"                \
  "madd   %[temp6],  %[temp0]                \n\t"                \
  "madd   %[temp7],  %[temp8]                \n\t"                \
  "lw     %[temp0],  " #A "(%[tmp])          \n\t"                \
  "lw     %[temp1],  " #C "(%[tmp])          \n\t"                \
  "lw     %[temp2],  " #B "(%[tmp])          \n\t"                \
  "lw     %[temp3],  " #D "(%[tmp])          \n\t"                \
  "addu   %[temp8],  %[temp0],    %[temp1]   \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp1]   \n\t"                \
  "addu   %[temp1],  %[temp2],    %[temp3]   \n\t"                \
  "subu   %[temp2],  %[temp2],    %[temp3]   \n\t"                \
  "addu   %[temp3],  %[temp8],    %[temp1]   \n\t"                \
  "subu   %[temp1],  %[temp8],    %[temp1]   \n\t"                \
  "addu   %[temp8],  %[temp0],    %[temp2]   \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp2]   \n\t"                \
  "sra    %[temp2],  %[temp3],    31         \n\t"                \
  "xor    %[temp3],  %[temp3],    %[temp2]   \n\t"                \
  "subu   %[temp3],  %[temp3],    %[temp2]   \n\t"                \
  "msub   %[temp4],  %[temp3]                \n\t"                \
  "sra    %[temp2],  %[temp8],    31         \n\t"                \
  "sra    %[temp3],  %[temp0],    31         \n\t"                \
  "sra    %[temp4],  %[temp1],    31         \n\t"                \
  "xor    %[temp8],  %[temp8],    %[temp2]   \n\t"                \
  "xor    %[temp0],  %[temp0],    %[temp3]   \n\t"                \
  "xor    %[temp1],  %[temp1],    %[temp4]   \n\t"                \
  "subu   %[temp8],  %[temp8],    %[temp2]   \n\t"                \
  "subu   %[temp0],  %[temp0],    %[temp3]   \n\t"                \
  "subu   %[temp1],  %[temp1],    %[temp4]   \n\t"                \
  "msub   %[temp5],  %[temp8]                \n\t"                \
  "msub   %[temp6],  %[temp0]                \n\t"                \
  "msub   %[temp7],  %[temp1]                \n\t"

static int Disto4x4(const uint8_t* const a, const uint8_t* const b,
                    const uint16_t* const w) {
  int tmp[32];
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8;

  __asm__ volatile(
    HORIZONTAL_PASS(0,   0,  4,  8, 12,    64,  68,  72,  76)
    HORIZONTAL_PASS(1,  16, 20, 24, 28,    80,  84,  88,  92)
    HORIZONTAL_PASS(2,  32, 36, 40, 44,    96, 100, 104, 108)
    HORIZONTAL_PASS(3,  48, 52, 56, 60,   112, 116, 120, 124)
    "mthi   $zero                             \n\t"
    "mtlo   $zero                             \n\t"
    VERTICAL_PASS( 0, 16, 32, 48,     64, 80,  96, 112,   0,  8, 16, 24)
    VERTICAL_PASS( 4, 20, 36, 52,     68, 84, 100, 116,   2, 10, 18, 26)
    VERTICAL_PASS( 8, 24, 40, 56,     72, 88, 104, 120,   4, 12, 20, 28)
    VERTICAL_PASS(12, 28, 44, 60,     76, 92, 108, 124,   6, 14, 22, 30)
    "mflo   %[temp0]                          \n\t"
    "sra    %[temp1],  %[temp0],  31          \n\t"
    "xor    %[temp0],  %[temp0],  %[temp1]    \n\t"
    "subu   %[temp0],  %[temp0],  %[temp1]    \n\t"
    "sra    %[temp0],  %[temp0],  5           \n\t"

    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [temp8]"=&r"(temp8)
    : [a]"r"(a), [b]"r"(b), [w]"r"(w), [tmp]"r"(tmp)
    : "memory", "hi", "lo"
  );

  return temp0;
}

#undef VERTICAL_PASS
#undef HORIZONTAL_PASS

static int Disto16x16(const uint8_t* const a, const uint8_t* const b,
                      const uint16_t* const w) {
  int D = 0;
  int x, y;
  for (y = 0; y < 16 * BPS; y += 4 * BPS) {
    for (x = 0; x < 16; x += 4) {
      D += Disto4x4(a + x + y, b + x + y, w);
    }
  }
  return D;
}

// macro for one horizontal pass in FTransform
// temp0..temp15 holds tmp[0]..tmp[15]
// A - offset in bytes to load from src and ref buffers
// TEMP0..TEMP3 - registers for corresponding tmp elements
#define HORIZONTAL_PASS(A, TEMP0, TEMP1, TEMP2, TEMP3)                  \
  "lw     %[" #TEMP1 "],  0(%[args])                           \n\t"    \
  "lw     %[" #TEMP2 "],  4(%[args])                           \n\t"    \
  "lbu    %[temp16],    0+" XSTR(BPS) "*" #A "(%[" #TEMP1 "])  \n\t"    \
  "lbu    %[temp17],    0+" XSTR(BPS) "*" #A "(%[" #TEMP2 "])  \n\t"    \
  "lbu    %[temp18],    1+" XSTR(BPS) "*" #A "(%[" #TEMP1 "])  \n\t"    \
  "lbu    %[temp19],    1+" XSTR(BPS) "*" #A "(%[" #TEMP2 "])  \n\t"    \
  "subu   %[temp20],    %[temp16],    %[temp17]                \n\t"    \
  "lbu    %[temp16],    2+" XSTR(BPS) "*" #A "(%[" #TEMP1 "])  \n\t"    \
  "lbu    %[temp17],    2+" XSTR(BPS) "*" #A "(%[" #TEMP2 "])  \n\t"    \
  "subu   %[" #TEMP0 "],  %[temp18],    %[temp19]              \n\t"    \
  "lbu    %[temp18],    3+" XSTR(BPS) "*" #A "(%[" #TEMP1 "])  \n\t"    \
  "lbu    %[temp19],    3+" XSTR(BPS) "*" #A "(%[" #TEMP2 "])  \n\t"    \
  "subu   %[" #TEMP1 "],  %[temp16],    %[temp17]              \n\t"    \
  "subu   %[" #TEMP2 "],  %[temp18],    %[temp19]              \n\t"    \
  "addu   %[" #TEMP3 "],  %[temp20],    %[" #TEMP2 "]          \n\t"    \
  "subu   %[" #TEMP2 "],  %[temp20],    %[" #TEMP2 "]          \n\t"    \
  "addu   %[temp20],    %[" #TEMP0 "],  %[" #TEMP1 "]          \n\t"    \
  "subu   %[" #TEMP0 "],  %[" #TEMP0 "],  %[" #TEMP1 "]        \n\t"    \
  "mul    %[temp16],    %[" #TEMP2 "],  %[c5352]               \n\t"    \
  "mul    %[temp17],    %[" #TEMP2 "],  %[c2217]               \n\t"    \
  "mul    %[temp18],    %[" #TEMP0 "],  %[c5352]               \n\t"    \
  "mul    %[temp19],    %[" #TEMP0 "],  %[c2217]               \n\t"    \
  "addu   %[" #TEMP1 "],  %[" #TEMP3 "],  %[temp20]            \n\t"    \
  "subu   %[temp20],    %[" #TEMP3 "],  %[temp20]              \n\t"    \
  "sll    %[" #TEMP0 "],  %[" #TEMP1 "],  3                    \n\t"    \
  "sll    %[" #TEMP2 "],  %[temp20],    3                      \n\t"    \
  "addiu  %[temp16],    %[temp16],    1812                     \n\t"    \
  "addiu  %[temp17],    %[temp17],    937                      \n\t"    \
  "addu   %[temp16],    %[temp16],    %[temp19]                \n\t"    \
  "subu   %[temp17],    %[temp17],    %[temp18]                \n\t"    \
  "sra    %[" #TEMP1 "],  %[temp16],    9                      \n\t"    \
  "sra    %[" #TEMP3 "],  %[temp17],    9                      \n\t"

// macro for one vertical pass in FTransform
// temp0..temp15 holds tmp[0]..tmp[15]
// A..D - offsets in bytes to store to out buffer
// TEMP0, TEMP4, TEMP8 and TEMP12 - registers for corresponding tmp elements
#define VERTICAL_PASS(A, B, C, D, TEMP0, TEMP4, TEMP8, TEMP12)    \
  "addu   %[temp16],    %[" #TEMP0 "],  %[" #TEMP12 "]   \n\t"    \
  "subu   %[temp19],    %[" #TEMP0 "],  %[" #TEMP12 "]   \n\t"    \
  "addu   %[temp17],    %[" #TEMP4 "],  %[" #TEMP8 "]    \n\t"    \
  "subu   %[temp18],    %[" #TEMP4 "],  %[" #TEMP8 "]    \n\t"    \
  "mul    %[" #TEMP8 "],  %[temp19],    %[c2217]         \n\t"    \
  "mul    %[" #TEMP12 "], %[temp18],    %[c2217]         \n\t"    \
  "mul    %[" #TEMP4 "],  %[temp19],    %[c5352]         \n\t"    \
  "mul    %[temp18],    %[temp18],    %[c5352]           \n\t"    \
  "addiu  %[temp16],    %[temp16],    7                  \n\t"    \
  "addu   %[" #TEMP0 "],  %[temp16],    %[temp17]        \n\t"    \
  "sra    %[" #TEMP0 "],  %[" #TEMP0 "],  4              \n\t"    \
  "addu   %[" #TEMP12 "], %[" #TEMP12 "], %[" #TEMP4 "]  \n\t"    \
  "subu   %[" #TEMP4 "],  %[temp16],    %[temp17]        \n\t"    \
  "sra    %[" #TEMP4 "],  %[" #TEMP4 "],  4              \n\t"    \
  "addiu  %[" #TEMP8 "],  %[" #TEMP8 "],  30000          \n\t"    \
  "addiu  %[" #TEMP12 "], %[" #TEMP12 "], 12000          \n\t"    \
  "addiu  %[" #TEMP8 "],  %[" #TEMP8 "],  21000          \n\t"    \
  "subu   %[" #TEMP8 "],  %[" #TEMP8 "],  %[temp18]      \n\t"    \
  "sra    %[" #TEMP12 "], %[" #TEMP12 "], 16             \n\t"    \
  "sra    %[" #TEMP8 "],  %[" #TEMP8 "],  16             \n\t"    \
  "addiu  %[temp16],    %[" #TEMP12 "], 1                \n\t"    \
  "movn   %[" #TEMP12 "], %[temp16],    %[temp19]        \n\t"    \
  "sh     %[" #TEMP0 "],  " #A "(%[temp20])              \n\t"    \
  "sh     %[" #TEMP4 "],  " #C "(%[temp20])              \n\t"    \
  "sh     %[" #TEMP8 "],  " #D "(%[temp20])              \n\t"    \
  "sh     %[" #TEMP12 "], " #B "(%[temp20])              \n\t"

static void FTransform(const uint8_t* src, const uint8_t* ref, int16_t* out) {
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8;
  int temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;
  int temp17, temp18, temp19, temp20;
  const int c2217 = 2217;
  const int c5352 = 5352;
  const int* const args[3] =
      { (const int*)src, (const int*)ref, (const int*)out };

  __asm__ volatile(
    HORIZONTAL_PASS(0, temp0,  temp1,  temp2,  temp3)
    HORIZONTAL_PASS(1, temp4,  temp5,  temp6,  temp7)
    HORIZONTAL_PASS(2, temp8,  temp9,  temp10, temp11)
    HORIZONTAL_PASS(3, temp12, temp13, temp14, temp15)
    "lw   %[temp20],    8(%[args])                     \n\t"
    VERTICAL_PASS(0,  8, 16, 24, temp0, temp4, temp8,  temp12)
    VERTICAL_PASS(2, 10, 18, 26, temp1, temp5, temp9,  temp13)
    VERTICAL_PASS(4, 12, 20, 28, temp2, temp6, temp10, temp14)
    VERTICAL_PASS(6, 14, 22, 30, temp3, temp7, temp11, temp15)

    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [temp8]"=&r"(temp8),
      [temp9]"=&r"(temp9), [temp10]"=&r"(temp10), [temp11]"=&r"(temp11),
      [temp12]"=&r"(temp12), [temp13]"=&r"(temp13), [temp14]"=&r"(temp14),
      [temp15]"=&r"(temp15), [temp16]"=&r"(temp16), [temp17]"=&r"(temp17),
      [temp18]"=&r"(temp18), [temp19]"=&r"(temp19), [temp20]"=&r"(temp20)
    : [args]"r"(args), [c2217]"r"(c2217), [c5352]"r"(c5352)
    : "memory", "hi", "lo"
  );
}

#undef VERTICAL_PASS
#undef HORIZONTAL_PASS

#if !defined(WORK_AROUND_GCC)

#define GET_SSE_INNER(A, B, C, D)                               \
  "lbu     %[temp0],    " #A "(%[a])                 \n\t"      \
  "lbu     %[temp1],    " #A "(%[b])                 \n\t"      \
  "lbu     %[temp2],    " #B "(%[a])                 \n\t"      \
  "lbu     %[temp3],    " #B "(%[b])                 \n\t"      \
  "lbu     %[temp4],    " #C "(%[a])                 \n\t"      \
  "lbu     %[temp5],    " #C "(%[b])                 \n\t"      \
  "lbu     %[temp6],    " #D "(%[a])                 \n\t"      \
  "lbu     %[temp7],    " #D "(%[b])                 \n\t"      \
  "subu    %[temp0],    %[temp0],     %[temp1]       \n\t"      \
  "subu    %[temp2],    %[temp2],     %[temp3]       \n\t"      \
  "subu    %[temp4],    %[temp4],     %[temp5]       \n\t"      \
  "subu    %[temp6],    %[temp6],     %[temp7]       \n\t"      \
  "madd    %[temp0],    %[temp0]                     \n\t"      \
  "madd    %[temp2],    %[temp2]                     \n\t"      \
  "madd    %[temp4],    %[temp4]                     \n\t"      \
  "madd    %[temp6],    %[temp6]                     \n\t"

#define GET_SSE(A, B, C, D)               \
  GET_SSE_INNER(A, A + 1, A + 2, A + 3)   \
  GET_SSE_INNER(B, B + 1, B + 2, B + 3)   \
  GET_SSE_INNER(C, C + 1, C + 2, C + 3)   \
  GET_SSE_INNER(D, D + 1, D + 2, D + 3)

static int SSE16x16(const uint8_t* a, const uint8_t* b) {
  int count;
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;

  __asm__ volatile(
     "mult   $zero,    $zero                            \n\t"

     GET_SSE( 0 * BPS, 4 +  0 * BPS, 8 +  0 * BPS, 12 +  0 * BPS)
     GET_SSE( 1 * BPS, 4 +  1 * BPS, 8 +  1 * BPS, 12 +  1 * BPS)
     GET_SSE( 2 * BPS, 4 +  2 * BPS, 8 +  2 * BPS, 12 +  2 * BPS)
     GET_SSE( 3 * BPS, 4 +  3 * BPS, 8 +  3 * BPS, 12 +  3 * BPS)
     GET_SSE( 4 * BPS, 4 +  4 * BPS, 8 +  4 * BPS, 12 +  4 * BPS)
     GET_SSE( 5 * BPS, 4 +  5 * BPS, 8 +  5 * BPS, 12 +  5 * BPS)
     GET_SSE( 6 * BPS, 4 +  6 * BPS, 8 +  6 * BPS, 12 +  6 * BPS)
     GET_SSE( 7 * BPS, 4 +  7 * BPS, 8 +  7 * BPS, 12 +  7 * BPS)
     GET_SSE( 8 * BPS, 4 +  8 * BPS, 8 +  8 * BPS, 12 +  8 * BPS)
     GET_SSE( 9 * BPS, 4 +  9 * BPS, 8 +  9 * BPS, 12 +  9 * BPS)
     GET_SSE(10 * BPS, 4 + 10 * BPS, 8 + 10 * BPS, 12 + 10 * BPS)
     GET_SSE(11 * BPS, 4 + 11 * BPS, 8 + 11 * BPS, 12 + 11 * BPS)
     GET_SSE(12 * BPS, 4 + 12 * BPS, 8 + 12 * BPS, 12 + 12 * BPS)
     GET_SSE(13 * BPS, 4 + 13 * BPS, 8 + 13 * BPS, 12 + 13 * BPS)
     GET_SSE(14 * BPS, 4 + 14 * BPS, 8 + 14 * BPS, 12 + 14 * BPS)
     GET_SSE(15 * BPS, 4 + 15 * BPS, 8 + 15 * BPS, 12 + 15 * BPS)

    "mflo    %[count]                                   \n\t"
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [count]"=&r"(count)
    : [a]"r"(a), [b]"r"(b)
    : "memory", "hi", "lo"
  );
  return count;
}

static int SSE16x8(const uint8_t* a, const uint8_t* b) {
  int count;
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;

  __asm__ volatile(
     "mult   $zero,    $zero                            \n\t"

     GET_SSE( 0 * BPS, 4 +  0 * BPS, 8 +  0 * BPS, 12 +  0 * BPS)
     GET_SSE( 1 * BPS, 4 +  1 * BPS, 8 +  1 * BPS, 12 +  1 * BPS)
     GET_SSE( 2 * BPS, 4 +  2 * BPS, 8 +  2 * BPS, 12 +  2 * BPS)
     GET_SSE( 3 * BPS, 4 +  3 * BPS, 8 +  3 * BPS, 12 +  3 * BPS)
     GET_SSE( 4 * BPS, 4 +  4 * BPS, 8 +  4 * BPS, 12 +  4 * BPS)
     GET_SSE( 5 * BPS, 4 +  5 * BPS, 8 +  5 * BPS, 12 +  5 * BPS)
     GET_SSE( 6 * BPS, 4 +  6 * BPS, 8 +  6 * BPS, 12 +  6 * BPS)
     GET_SSE( 7 * BPS, 4 +  7 * BPS, 8 +  7 * BPS, 12 +  7 * BPS)

    "mflo    %[count]                                   \n\t"
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [count]"=&r"(count)
    : [a]"r"(a), [b]"r"(b)
    : "memory", "hi", "lo"
  );
  return count;
}

static int SSE8x8(const uint8_t* a, const uint8_t* b) {
  int count;
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;

  __asm__ volatile(
     "mult   $zero,    $zero                            \n\t"

     GET_SSE(0 * BPS, 4 + 0 * BPS, 1 * BPS, 4 + 1 * BPS)
     GET_SSE(2 * BPS, 4 + 2 * BPS, 3 * BPS, 4 + 3 * BPS)
     GET_SSE(4 * BPS, 4 + 4 * BPS, 5 * BPS, 4 + 5 * BPS)
     GET_SSE(6 * BPS, 4 + 6 * BPS, 7 * BPS, 4 + 7 * BPS)

    "mflo    %[count]                                   \n\t"
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [count]"=&r"(count)
    : [a]"r"(a), [b]"r"(b)
    : "memory", "hi", "lo"
  );
  return count;
}

static int SSE4x4(const uint8_t* a, const uint8_t* b) {
  int count;
  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;

  __asm__ volatile(
     "mult   $zero,    $zero                            \n\t"

     GET_SSE(0 * BPS, 1 * BPS, 2 * BPS, 3 * BPS)

    "mflo    %[count]                                   \n\t"
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7), [count]"=&r"(count)
    : [a]"r"(a), [b]"r"(b)
    : "memory", "hi", "lo"
  );
  return count;
}

#undef GET_SSE
#undef GET_SSE_INNER

#endif  // !WORK_AROUND_GCC

//------------------------------------------------------------------------------
// Entry point

extern void VP8EncDspInitMIPS32(void);

WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitMIPS32(void) {
  VP8ITransform = ITransform;
  VP8FTransform = FTransform;
  VP8EncQuantizeBlock = QuantizeBlock;
  VP8EncQuantize2Blocks = Quantize2Blocks;
  VP8TDisto4x4 = Disto4x4;
  VP8TDisto16x16 = Disto16x16;
#if !defined(WORK_AROUND_GCC)
  VP8SSE16x16 = SSE16x16;
  VP8SSE8x8 = SSE8x8;
  VP8SSE16x8 = SSE16x8;
  VP8SSE4x4 = SSE4x4;
#endif
}

#else  // !WEBP_USE_MIPS32

WEBP_DSP_INIT_STUB(VP8EncDspInitMIPS32)

#endif  // WEBP_USE_MIPS32
