text: // 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 DSPr2 version of YUV to RGB upsampling functions.
  //
  // Author(s):  Branimir Vasic (branimir.vasic@imgtec.com)
  //             Djordje Pesut  (djordje.pesut@imgtec.com)
  
  #include "./dsp.h"
  
  #if defined(WEBP_USE_MIPS_DSP_R2)
  
  #include "./yuv.h"
  
  //------------------------------------------------------------------------------
  // simple point-sampling
  
  #define ROW_FUNC_PART_1()                                                      \
    "lbu              %[temp3],   0(%[v])                         \n\t"          \
    "lbu              %[temp4],   0(%[u])                         \n\t"          \
    "lbu              %[temp0],   0(%[y])                         \n\t"          \
    "mul              %[temp1],   %[t_con_1],     %[temp3]        \n\t"          \
    "mul              %[temp3],   %[t_con_2],     %[temp3]        \n\t"          \
    "mul              %[temp2],   %[t_con_3],     %[temp4]        \n\t"          \
    "mul              %[temp4],   %[t_con_4],     %[temp4]        \n\t"          \
    "mul              %[temp0],   %[t_con_5],     %[temp0]        \n\t"          \
    "addu             %[temp1],   %[temp1],       %[t_con_6]      \n\t"          \
    "subu             %[temp3],   %[temp3],       %[t_con_7]      \n\t"          \
    "addu             %[temp2],   %[temp2],       %[temp3]        \n\t"          \
    "addu             %[temp4],   %[temp4],       %[t_con_8]      \n\t"          \
  
  #define ROW_FUNC_PART_2(R, G, B, K)                                            \
    "addu             %[temp5],   %[temp0],       %[temp1]        \n\t"          \
    "subu             %[temp6],   %[temp0],       %[temp2]        \n\t"          \
    "addu             %[temp7],   %[temp0],       %[temp4]        \n\t"          \
  ".if "#K"                                                       \n\t"          \
    "lbu              %[temp0],   1(%[y])                         \n\t"          \
  ".endif                                                         \n\t"          \
    "shll_s.w         %[temp5],   %[temp5],       9               \n\t"          \
    "shll_s.w         %[temp6],   %[temp6],       9               \n\t"          \
  ".if "#K"                                                       \n\t"          \
    "mul              %[temp0],   %[t_con_5],     %[temp0]        \n\t"          \
  ".endif                                                         \n\t"          \
    "shll_s.w         %[temp7],   %[temp7],       9               \n\t"          \
    "precrqu_s.qb.ph  %[temp5],   %[temp5],       $zero           \n\t"          \
    "precrqu_s.qb.ph  %[temp6],   %[temp6],       $zero           \n\t"          \
    "precrqu_s.qb.ph  %[temp7],   %[temp7],       $zero           \n\t"          \
    "srl              %[temp5],   %[temp5],       24              \n\t"          \
    "srl              %[temp6],   %[temp6],       24              \n\t"          \
    "srl              %[temp7],   %[temp7],       24              \n\t"          \
    "sb               %[temp5],   "#R"(%[dst])                    \n\t"          \
    "sb               %[temp6],   "#G"(%[dst])                    \n\t"          \
    "sb               %[temp7],   "#B"(%[dst])                    \n\t"          \
  
  #define ASM_CLOBBER_LIST()                                                     \
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),             \
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),             \
      [temp6]"=&r"(temp6), [temp7]"=&r"(temp7)                                   \
    : [t_con_1]"r"(t_con_1), [t_con_2]"r"(t_con_2), [t_con_3]"r"(t_con_3),       \
      [t_con_4]"r"(t_con_4), [t_con_5]"r"(t_con_5), [t_con_6]"r"(t_con_6),       \
      [u]"r"(u), [v]"r"(v), [y]"r"(y), [dst]"r"(dst),                            \
      [t_con_7]"r"(t_con_7), [t_con_8]"r"(t_con_8)                               \
    : "memory", "hi", "lo"                                                       \
  
  #define ROW_FUNC(FUNC_NAME, XSTEP, R, G, B, A)                                 \
  static void FUNC_NAME(const uint8_t* y,                                        \
                        const uint8_t* u, const uint8_t* v,                      \
                        uint8_t* dst, int len) {                                 \
    int i;                                                                       \
    uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;             \
    const int t_con_1 = kVToR;                                                   \
    const int t_con_2 = kVToG;                                                   \
    const int t_con_3 = kUToG;                                                   \
    const int t_con_4 = kUToB;                                                   \
    const int t_con_5 = kYScale;                                                 \
    const int t_con_6 = kRCst;                                                   \
    const int t_con_7 = kGCst;                                                   \
    const int t_con_8 = kBCst;                                                   \
    for (i = 0; i < (len >> 1); i++) {                                           \
      __asm__ volatile (                                                         \
        ROW_FUNC_PART_1()                                                        \
        ROW_FUNC_PART_2(R, G, B, 1)                                              \
        ROW_FUNC_PART_2(R + XSTEP, G + XSTEP, B + XSTEP, 0)                      \
        ASM_CLOBBER_LIST()                                                       \
      );                                                                         \
      if (A) dst[A] = dst[A + XSTEP] = 0xff;                                     \
      y += 2;                                                                    \
      ++u;                                                                       \
      ++v;                                                                       \
      dst += 2 * XSTEP;                                                          \
    }                                                                            \
    if (len & 1) {                                                               \
      __asm__ volatile (                                                         \
        ROW_FUNC_PART_1()                                                        \
        ROW_FUNC_PART_2(R, G, B, 0)                                              \
        ASM_CLOBBER_LIST()                                                       \
      );                                                                         \
      if (A) dst[A] = 0xff;                                                      \
    }                                                                            \
  }
  
  ROW_FUNC(YuvToRgbRow,      3, 0, 1, 2, 0)
  ROW_FUNC(YuvToRgbaRow,     4, 0, 1, 2, 3)
  ROW_FUNC(YuvToBgrRow,      3, 2, 1, 0, 0)
  ROW_FUNC(YuvToBgraRow,     4, 2, 1, 0, 3)
  
  #undef ROW_FUNC
  #undef ASM_CLOBBER_LIST
  #undef ROW_FUNC_PART_2
  #undef ROW_FUNC_PART_1
  
  #endif  // WEBP_USE_MIPS_DSP_R2
  
  //------------------------------------------------------------------------------
  
  extern void WebPInitSamplersMIPSdspR2(void);
  
  WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPSdspR2(void) {
  #if defined(WEBP_USE_MIPS_DSP_R2)
    WebPSamplers[MODE_RGB]  = YuvToRgbRow;
    WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
    WebPSamplers[MODE_BGR]  = YuvToBgrRow;
    WebPSamplers[MODE_BGRA] = YuvToBgraRow;
  #endif  // WEBP_USE_MIPS_DSP_R2
  }
  