static void ConvertBGRAToRGB565_MIPSdspR2()

in Extended/libwebp/src/dsp/lossless_mips_dsp_r2.c [539:615]

• 77 lines of code
• 1 McCabe index (conditional complexity)

static void ConvertBGRAToRGB565_MIPSdspR2(const uint32_t* src,
                                          int num_pixels, uint8_t* dst) {
  int temp0, temp1, temp2, temp3, temp4, temp5;
  const uint32_t* const p_loop1_end = src + (num_pixels & ~3);
  const uint32_t* const p_loop2_end = src + num_pixels;
  __asm__ volatile (
    ".set           push                                       \n\t"
    ".set           noreorder                                  \n\t"
    "beq            %[src],      %[p_loop1_end],    3f         \n\t"
    " nop                                                      \n\t"
  "0:                                                          \n\t"
    "lw             %[temp0],    0(%[src])                     \n\t"
    "lw             %[temp1],    4(%[src])                     \n\t"
    "lw             %[temp2],    8(%[src])                     \n\t"
    "lw             %[temp3],    12(%[src])                    \n\t"
    "ext            %[temp4],    %[temp0],          8,    16   \n\t"
    "ext            %[temp5],    %[temp0],          5,    11   \n\t"
    "ext            %[temp0],    %[temp0],          3,    5    \n\t"
    "ins            %[temp4],    %[temp5],          0,    11   \n\t"
    "ext            %[temp5],    %[temp1],          5,    11   \n\t"
    "ins            %[temp4],    %[temp0],          0,    5    \n\t"
    "ext            %[temp0],    %[temp1],          8,    16   \n\t"
    "ext            %[temp1],    %[temp1],          3,    5    \n\t"
    "ins            %[temp0],    %[temp5],          0,    11   \n\t"
    "ext            %[temp5],    %[temp2],          5,    11   \n\t"
    "ins            %[temp0],    %[temp1],          0,    5    \n\t"
    "ext            %[temp1],    %[temp2],          8,    16   \n\t"
    "ext            %[temp2],    %[temp2],          3,    5    \n\t"
    "ins            %[temp1],    %[temp5],          0,    11   \n\t"
    "ext            %[temp5],    %[temp3],          5,    11   \n\t"
    "ins            %[temp1],    %[temp2],          0,    5    \n\t"
    "ext            %[temp2],    %[temp3],          8,    16   \n\t"
    "ext            %[temp3],    %[temp3],          3,    5    \n\t"
    "ins            %[temp2],    %[temp5],          0,    11   \n\t"
    "append         %[temp0],    %[temp4],          16         \n\t"
    "ins            %[temp2],    %[temp3],          0,    5    \n\t"
    "addiu          %[src],      %[src],            16         \n\t"
    "append         %[temp2],    %[temp1],          16         \n\t"
#if (WEBP_SWAP_16BIT_CSP == 1)
    "usw            %[temp0],    0(%[dst])                     \n\t"
    "usw            %[temp2],    4(%[dst])                     \n\t"
#else
    "wsbh           %[temp0],    %[temp0]                      \n\t"
    "wsbh           %[temp2],    %[temp2]                      \n\t"
    "usw            %[temp0],    0(%[dst])                     \n\t"
    "usw            %[temp2],    4(%[dst])                     \n\t"
#endif
    "bne            %[src],      %[p_loop1_end],    0b         \n\t"
    " addiu         %[dst],      %[dst],            8          \n\t"
  "3:                                                          \n\t"
    "beq            %[src],      %[p_loop2_end],    2f         \n\t"
    " nop                                                      \n\t"
  "1:                                                          \n\t"
    "lw             %[temp0],    0(%[src])                     \n\t"
    "ext            %[temp4],    %[temp0],          8,    16   \n\t"
    "ext            %[temp5],    %[temp0],          5,    11   \n\t"
    "ext            %[temp0],    %[temp0],          3,    5    \n\t"
    "ins            %[temp4],    %[temp5],          0,    11   \n\t"
    "addiu          %[src],      %[src],            4          \n\t"
    "ins            %[temp4],    %[temp0],          0,    5    \n\t"
#if (WEBP_SWAP_16BIT_CSP == 1)
    "ush            %[temp4],    0(%[dst])                     \n\t"
#else
    "wsbh           %[temp4],    %[temp4]                      \n\t"
    "ush            %[temp4],    0(%[dst])                     \n\t"
#endif
    "bne            %[src],      %[p_loop2_end],    1b         \n\t"
    " addiu         %[dst],      %[dst],            2          \n\t"
  "2:                                                          \n\t"
    ".set           pop                                        \n\t"
    : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
      [temp3]"=&r"(temp3), [temp4]"=&r"(temp4), [temp5]"=&r"(temp5),
      [dst]"+&r"(dst), [src]"+&r"(src)
    : [p_loop1_end]"r"(p_loop1_end), [p_loop2_end]"r"(p_loop2_end)
    : "memory"
  );
}