static void TransformColor_MIPSdspR2()

in Extended/libwebp/src/dsp/lossless_enc_mips_dsp_r2.c [81:161]

• 80 lines of code
• 2 McCabe index (conditional complexity)

static void TransformColor_MIPSdspR2(const VP8LMultipliers* const m,
                                     uint32_t* data, int num_pixels) {
  int temp0, temp1, temp2, temp3, temp4, temp5;
  uint32_t argb, argb1, new_red, new_red1;
  const uint32_t G_to_R = m->green_to_red_;
  const uint32_t G_to_B = m->green_to_blue_;
  const uint32_t R_to_B = m->red_to_blue_;
  uint32_t* const p_loop_end = data + (num_pixels & ~1);
  __asm__ volatile (
    ".set            push                                    \n\t"
    ".set            noreorder                               \n\t"
    "beq             %[data],      %[p_loop_end],  1f        \n\t"
    " nop                                                    \n\t"
    "replv.ph        %[temp0],     %[G_to_R]                 \n\t"
    "replv.ph        %[temp1],     %[G_to_B]                 \n\t"
    "replv.ph        %[temp2],     %[R_to_B]                 \n\t"
    "shll.ph         %[temp0],     %[temp0],       8         \n\t"
    "shll.ph         %[temp1],     %[temp1],       8         \n\t"
    "shll.ph         %[temp2],     %[temp2],       8         \n\t"
    "shra.ph         %[temp0],     %[temp0],       8         \n\t"
    "shra.ph         %[temp1],     %[temp1],       8         \n\t"
    "shra.ph         %[temp2],     %[temp2],       8         \n\t"
  "0:                                                        \n\t"
    "lw              %[argb],      0(%[data])                \n\t"
    "lw              %[argb1],     4(%[data])                \n\t"
    "lhu             %[new_red],   2(%[data])                \n\t"
    "lhu             %[new_red1],  6(%[data])                \n\t"
    "precrq.qb.ph    %[temp3],     %[argb],        %[argb1]  \n\t"
    "precr.qb.ph     %[temp4],     %[argb],        %[argb1]  \n\t"
    "preceu.ph.qbra  %[temp3],     %[temp3]                  \n\t"
    "preceu.ph.qbla  %[temp4],     %[temp4]                  \n\t"
    "shll.ph         %[temp3],     %[temp3],       8         \n\t"
    "shll.ph         %[temp4],     %[temp4],       8         \n\t"
    "shra.ph         %[temp3],     %[temp3],       8         \n\t"
    "shra.ph         %[temp4],     %[temp4],       8         \n\t"
    "mul.ph          %[temp5],     %[temp3],       %[temp0]  \n\t"
    "mul.ph          %[temp3],     %[temp3],       %[temp1]  \n\t"
    "mul.ph          %[temp4],     %[temp4],       %[temp2]  \n\t"
    "addiu           %[data],      %[data],        8         \n\t"
    "ins             %[new_red1],  %[new_red],     16,   16  \n\t"
    "ins             %[argb1],     %[argb],        16,   16  \n\t"
    "shra.ph         %[temp5],     %[temp5],       5         \n\t"
    "shra.ph         %[temp3],     %[temp3],       5         \n\t"
    "shra.ph         %[temp4],     %[temp4],       5         \n\t"
    "subu.ph         %[new_red1],  %[new_red1],    %[temp5]  \n\t"
    "subu.ph         %[argb1],     %[argb1],       %[temp3]  \n\t"
    "preceu.ph.qbra  %[temp5],     %[new_red1]               \n\t"
    "subu.ph         %[argb1],     %[argb1],       %[temp4]  \n\t"
    "preceu.ph.qbra  %[temp3],     %[argb1]                  \n\t"
    "sb              %[temp5],     -2(%[data])               \n\t"
    "sb              %[temp3],     -4(%[data])               \n\t"
    "sra             %[temp5],     %[temp5],       16        \n\t"
    "sra             %[temp3],     %[temp3],       16        \n\t"
    "sb              %[temp5],     -6(%[data])               \n\t"
    "bne             %[data],      %[p_loop_end],  0b        \n\t"
    " sb             %[temp3],     -8(%[data])               \n\t"
  "1:                                                        \n\t"
    ".set            pop                                     \n\t"
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [new_red1]"=&r"(new_red1), [new_red]"=&r"(new_red),
      [argb]"=&r"(argb), [argb1]"=&r"(argb1), [data]"+&r"(data)
    : [G_to_R]"r"(G_to_R), [R_to_B]"r"(R_to_B),
      [G_to_B]"r"(G_to_B), [p_loop_end]"r"(p_loop_end)
    : "memory", "hi", "lo"
  );

  if (num_pixels & 1) {
    const uint32_t argb_ = data[0];
    const uint32_t green = argb_ >> 8;
    const uint32_t red = argb_ >> 16;
    uint32_t new_blue = argb_;
    new_red = red;
    new_red -= ColorTransformDelta(m->green_to_red_, green);
    new_red &= 0xff;
    new_blue -= ColorTransformDelta(m->green_to_blue_, green);
    new_blue -= ColorTransformDelta(m->red_to_blue_, red);
    new_blue &= 0xff;
    data[0] = (argb_ & 0xff00ff00u) | (new_red << 16) | (new_blue);
  }
}