kc3-lang/libjpeg-turbo/simd/mips64/jfdctint-mmi.c

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  Date : 2025-09-26T10:09:01
  

  MMI: Format comments consistently with MMX code
  

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• simd/mips64/jfdctint-mmi.c

• /*
   * Loongson MMI optimizations for libjpeg-turbo
   *
   * Copyright (C) 2014, 2018, 2020, D. R. Commander.  All Rights Reserved.
   * Copyright (C) 2016-2017, Loongson Technology Corporation Limited, BeiJing.
   *                          All Rights Reserved.
   * Authors:  ZhuChen     <zhuchen@loongson.cn>
   *           CaiWanwei   <caiwanwei@loongson.cn>
   *           SunZhangzhi <sunzhangzhi-cq@loongson.cn>
   *
   * Based on the x86 SIMD extension for IJG JPEG library
   * Copyright (C) 1999-2006, MIYASAKA Masaru.
   *
   * This software is provided 'as-is', without any express or implied
   * warranty.  In no event will the authors be held liable for any damages
   * arising from the use of this software.
   *
   * Permission is granted to anyone to use this software for any purpose,
   * including commercial applications, and to alter it and redistribute it
   * freely, subject to the following restrictions:
   *
   * 1. The origin of this software must not be misrepresented; you must not
   *    claim that you wrote the original software. If you use this software
   *    in a product, an acknowledgment in the product documentation would be
   *    appreciated but is not required.
   * 2. Altered source versions must be plainly marked as such, and must not be
   *    misrepresented as being the original software.
   * 3. This notice may not be removed or altered from any source distribution.
   */
  
  /* ACCURATE INTEGER FORWARD DCT */
  
  #include "jsimd_mmi.h"
  
  
  #define CONST_BITS  13
  #define PASS1_BITS  2
  #define DESCALE_P1  (CONST_BITS - PASS1_BITS)
  #define DESCALE_P2  (CONST_BITS + PASS1_BITS)
  
  #define FIX_0_298  ((short)2446)   /* FIX(0.298631336) */
  #define FIX_0_390  ((short)3196)   /* FIX(0.390180644) */
  #define FIX_0_541  ((short)4433)   /* FIX(0.541196100) */
  #define FIX_0_765  ((short)6270)   /* FIX(0.765366865) */
  #define FIX_0_899  ((short)7373)   /* FIX(0.899976223) */
  #define FIX_1_175  ((short)9633)   /* FIX(1.175875602) */
  #define FIX_1_501  ((short)12299)  /* FIX(1.501321110) */
  #define FIX_1_847  ((short)15137)  /* FIX(1.847759065) */
  #define FIX_1_961  ((short)16069)  /* FIX(1.961570560) */
  #define FIX_2_053  ((short)16819)  /* FIX(2.053119869) */
  #define FIX_2_562  ((short)20995)  /* FIX(2.562915447) */
  #define FIX_3_072  ((short)25172)  /* FIX(3.072711026) */
  
  enum const_index {
    index_PW_F130_F054,
    index_PW_F054_MF130,
    index_PW_MF078_F117,
    index_PW_F117_F078,
    index_PW_MF060_MF089,
    index_PW_MF089_F060,
    index_PW_MF050_MF256,
    index_PW_MF256_F050,
    index_PD_DESCALE_P1,
    index_PD_DESCALE_P2,
    index_PW_DESCALE_P2X
  };
  
  static uint64_t const_value[] = {
    _uint64_set_pi16(FIX_0_541, (FIX_0_541 + FIX_0_765),
                     FIX_0_541, (FIX_0_541 + FIX_0_765)),
    _uint64_set_pi16((FIX_0_541 - FIX_1_847), FIX_0_541,
                     (FIX_0_541 - FIX_1_847), FIX_0_541),
    _uint64_set_pi16(FIX_1_175, (FIX_1_175 - FIX_1_961),
                     FIX_1_175, (FIX_1_175 - FIX_1_961)),
    _uint64_set_pi16((FIX_1_175 - FIX_0_390), FIX_1_175,
                     (FIX_1_175 - FIX_0_390), FIX_1_175),
    _uint64_set_pi16(-FIX_0_899, (FIX_0_298 - FIX_0_899),
                     -FIX_0_899, (FIX_0_298 - FIX_0_899)),
    _uint64_set_pi16((FIX_1_501 - FIX_0_899), -FIX_0_899,
                     (FIX_1_501 - FIX_0_899), -FIX_0_899),
    _uint64_set_pi16(-FIX_2_562, (FIX_2_053 - FIX_2_562),
                     -FIX_2_562, (FIX_2_053 - FIX_2_562)),
    _uint64_set_pi16((FIX_3_072 - FIX_2_562), -FIX_2_562,
                     (FIX_3_072 - FIX_2_562), -FIX_2_562),
    _uint64_set_pi32((1 << (DESCALE_P1 - 1)), (1 << (DESCALE_P1 - 1))),
    _uint64_set_pi32((1 << (DESCALE_P2 - 1)), (1 << (DESCALE_P2 - 1))),
    _uint64_set_pi16((1 << (PASS1_BITS - 1)), (1 << (PASS1_BITS - 1)),
                     (1 << (PASS1_BITS - 1)), (1 << (PASS1_BITS - 1)))
  };
  
  #define PW_F130_F054    get_const_value(index_PW_F130_F054)
  #define PW_F054_MF130   get_const_value(index_PW_F054_MF130)
  #define PW_MF078_F117   get_const_value(index_PW_MF078_F117)
  #define PW_F117_F078    get_const_value(index_PW_F117_F078)
  #define PW_MF060_MF089  get_const_value(index_PW_MF060_MF089)
  #define PW_MF089_F060   get_const_value(index_PW_MF089_F060)
  #define PW_MF050_MF256  get_const_value(index_PW_MF050_MF256)
  #define PW_MF256_F050   get_const_value(index_PW_MF256_F050)
  #define PD_DESCALE_P1   get_const_value(index_PD_DESCALE_P1)
  #define PD_DESCALE_P2   get_const_value(index_PD_DESCALE_P2)
  #define PW_DESCALE_P2X  get_const_value(index_PW_DESCALE_P2X)
  
  
  #define DO_FDCT_COMMON(PASS) { \
    __m64 tmp1312l, tmp1312h, tmp47l, tmp47h, tmp4l, tmp4h, tmp7l, tmp7h; \
    __m64 tmp56l, tmp56h, tmp5l, tmp5h, tmp6l, tmp6h; \
    __m64 out1l, out1h, out2l, out2h, out3l, out3h; \
    __m64 out5l, out5h, out6l, out6h, out7l, out7h; \
    __m64 z34l, z34h, z3l, z3h, z4l, z4h, z3, z4; \
    \
    /* (Original) \
     * z1 = (tmp12 + tmp13) * 0.541196100; \
     * out2 = z1 + tmp13 * 0.765366865; \
     * out6 = z1 + tmp12 * -1.847759065; \
     * \
     * (This implementation) \
     * out2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100; \
     * out6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065); \
     */ \
    \
    tmp1312l = _mm_unpacklo_pi16(tmp13, tmp12); \
    tmp1312h = _mm_unpackhi_pi16(tmp13, tmp12); \
    \
    out2l = _mm_madd_pi16(tmp1312l, PW_F130_F054); \
    out2h = _mm_madd_pi16(tmp1312h, PW_F130_F054); \
    out6l = _mm_madd_pi16(tmp1312l, PW_F054_MF130); \
    out6h = _mm_madd_pi16(tmp1312h, PW_F054_MF130); \
    \
    out2l = _mm_add_pi32(out2l, PD_DESCALE_P##PASS); \
    out2h = _mm_add_pi32(out2h, PD_DESCALE_P##PASS); \
    out2l = _mm_srai_pi32(out2l, DESCALE_P##PASS); \
    out2h = _mm_srai_pi32(out2h, DESCALE_P##PASS); \
    \
    out6l = _mm_add_pi32(out6l, PD_DESCALE_P##PASS); \
    out6h = _mm_add_pi32(out6h, PD_DESCALE_P##PASS); \
    out6l = _mm_srai_pi32(out6l, DESCALE_P##PASS); \
    out6h = _mm_srai_pi32(out6h, DESCALE_P##PASS); \
    \
    out2 = _mm_packs_pi32(out2l, out2h); \
    out6 = _mm_packs_pi32(out6l, out6h); \
    \
    /* Odd part */ \
    \
    z3 = _mm_add_pi16(tmp4, tmp6); \
    z4 = _mm_add_pi16(tmp5, tmp7); \
    \
    /* (Original) \
     * z5 = (z3 + z4) * 1.175875602; \
     * z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644; \
     * z3 += z5;  z4 += z5; \
     * \
     * (This implementation) \
     * z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; \
     * z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); \
     */ \
    \
    z34l = _mm_unpacklo_pi16(z3, z4); \
    z34h = _mm_unpackhi_pi16(z3, z4); \
    z3l = _mm_madd_pi16(z34l, PW_MF078_F117); \
    z3h = _mm_madd_pi16(z34h, PW_MF078_F117); \
    z4l = _mm_madd_pi16(z34l, PW_F117_F078); \
    z4h = _mm_madd_pi16(z34h, PW_F117_F078); \
    \
    /* (Original) \
     * z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6; \
     * tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869; \
     * tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110; \
     * z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447; \
     * out7 = tmp4 + z1 + z3;  out5 = tmp5 + z2 + z4; \
     * out3 = tmp6 + z2 + z3;  out1 = tmp7 + z1 + z4; \
     * \
     * (This implementation) \
     * tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223; \
     * tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447; \
     * tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447); \
     * tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223); \
     * out7 = tmp4 + z3;  out5 = tmp5 + z4; \
     * out3 = tmp6 + z3;  out1 = tmp7 + z4; \
     */ \
    \
    tmp47l = _mm_unpacklo_pi16(tmp4, tmp7); \
    tmp47h = _mm_unpackhi_pi16(tmp4, tmp7); \
    \
    tmp4l = _mm_madd_pi16(tmp47l, PW_MF060_MF089); \
    tmp4h = _mm_madd_pi16(tmp47h, PW_MF060_MF089); \
    tmp7l = _mm_madd_pi16(tmp47l, PW_MF089_F060); \
    tmp7h = _mm_madd_pi16(tmp47h, PW_MF089_F060); \
    \
    out7l = _mm_add_pi32(tmp4l, z3l); \
    out7h = _mm_add_pi32(tmp4h, z3h); \
    out1l = _mm_add_pi32(tmp7l, z4l); \
    out1h = _mm_add_pi32(tmp7h, z4h); \
    \
    out7l = _mm_add_pi32(out7l, PD_DESCALE_P##PASS); \
    out7h = _mm_add_pi32(out7h, PD_DESCALE_P##PASS); \
    out7l = _mm_srai_pi32(out7l, DESCALE_P##PASS); \
    out7h = _mm_srai_pi32(out7h, DESCALE_P##PASS); \
    \
    out1l = _mm_add_pi32(out1l, PD_DESCALE_P##PASS); \
    out1h = _mm_add_pi32(out1h, PD_DESCALE_P##PASS); \
    out1l = _mm_srai_pi32(out1l, DESCALE_P##PASS); \
    out1h = _mm_srai_pi32(out1h, DESCALE_P##PASS); \
    \
    out7 = _mm_packs_pi32(out7l, out7h); \
    out1 = _mm_packs_pi32(out1l, out1h); \
    \
    tmp56l = _mm_unpacklo_pi16(tmp5, tmp6); \
    tmp56h = _mm_unpackhi_pi16(tmp5, tmp6); \
    \
    tmp5l = _mm_madd_pi16(tmp56l, PW_MF050_MF256); \
    tmp5h = _mm_madd_pi16(tmp56h, PW_MF050_MF256); \
    tmp6l = _mm_madd_pi16(tmp56l, PW_MF256_F050); \
    tmp6h = _mm_madd_pi16(tmp56h, PW_MF256_F050); \
    \
    out5l = _mm_add_pi32(tmp5l, z4l); \
    out5h = _mm_add_pi32(tmp5h, z4h); \
    out3l = _mm_add_pi32(tmp6l, z3l); \
    out3h = _mm_add_pi32(tmp6h, z3h); \
    \
    out5l = _mm_add_pi32(out5l, PD_DESCALE_P##PASS); \
    out5h = _mm_add_pi32(out5h, PD_DESCALE_P##PASS); \
    out5l = _mm_srai_pi32(out5l, DESCALE_P##PASS); \
    out5h = _mm_srai_pi32(out5h, DESCALE_P##PASS); \
    \
    out3l = _mm_add_pi32(out3l, PD_DESCALE_P##PASS); \
    out3h = _mm_add_pi32(out3h, PD_DESCALE_P##PASS); \
    out3l = _mm_srai_pi32(out3l, DESCALE_P##PASS); \
    out3h = _mm_srai_pi32(out3h, DESCALE_P##PASS); \
    \
    out5 = _mm_packs_pi32(out5l, out5h); \
    out3 = _mm_packs_pi32(out3l, out3h); \
  }
  
  #define DO_FDCT_PASS1() { \
    __m64 row0l, row0h, row1l, row1h, row2l, row2h, row3l, row3h; \
    __m64 row01a, row01b, row01c, row01d, row23a, row23b, row23c, row23d; \
    __m64 col0, col1, col2, col3, col4, col5, col6, col7; \
    __m64 tmp10, tmp11; \
    \
    row0l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 0]);      /* (00 01 02 03) */ \
    row0h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 0 + 4]);  /* (04 05 06 07) */ \
    row1l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 1]);      /* (10 11 12 13) */ \
    row1h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 1 + 4]);  /* (14 15 16 17) */ \
    row2l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 2]);      /* (20 21 22 23) */ \
    row2h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 2 + 4]);  /* (24 25 26 27) */ \
    row3l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 3]);      /* (30 31 32 33) */ \
    row3h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 3 + 4]);  /* (34 35 36 37) */ \
    \
    /* Transpose coefficients */ \
    \
    row23a = _mm_unpacklo_pi16(row2l, row3l);   /* row23a = (20 30 21 31) */ \
    row23b = _mm_unpackhi_pi16(row2l, row3l);   /* row23b = (22 32 23 33) */ \
    row23c = _mm_unpacklo_pi16(row2h, row3h);   /* row23c = (24 34 25 35) */ \
    row23d = _mm_unpackhi_pi16(row2h, row3h);   /* row23d = (26 36 27 37) */ \
    \
    row01a = _mm_unpacklo_pi16(row0l, row1l);   /* row01a = (00 10 01 11) */ \
    row01b = _mm_unpackhi_pi16(row0l, row1l);   /* row01b = (02 12 03 13) */ \
    row01c = _mm_unpacklo_pi16(row0h, row1h);   /* row01c = (04 14 05 15) */ \
    row01d = _mm_unpackhi_pi16(row0h, row1h);   /* row01d = (06 16 07 17) */ \
    \
    col0 = _mm_unpacklo_pi32(row01a, row23a);   /* col0 = (00 10 20 30) */ \
    col1 = _mm_unpackhi_pi32(row01a, row23a);   /* col1 = (01 11 21 31) */ \
    col6 = _mm_unpacklo_pi32(row01d, row23d);   /* col6 = (06 16 26 36) */ \
    col7 = _mm_unpackhi_pi32(row01d, row23d);   /* col7 = (07 17 27 37) */ \
    \
    tmp6 = _mm_sub_pi16(col1, col6);            /* tmp6 = col1 - col6 */ \
    tmp7 = _mm_sub_pi16(col0, col7);            /* tmp7 = col0 - col7 */ \
    tmp1 = _mm_add_pi16(col1, col6);            /* tmp1 = col1 + col6 */ \
    tmp0 = _mm_add_pi16(col0, col7);            /* tmp0 = col0 + col7 */ \
    \
    col2 = _mm_unpacklo_pi32(row01b, row23b);   /* col2 = (02 12 22 32) */ \
    col3 = _mm_unpackhi_pi32(row01b, row23b);   /* col3 = (03 13 23 33) */ \
    col4 = _mm_unpacklo_pi32(row01c, row23c);   /* col4 = (04 14 24 34) */ \
    col5 = _mm_unpackhi_pi32(row01c, row23c);   /* col5 = (05 15 25 35) */ \
    \
    tmp3 = _mm_add_pi16(col3, col4);            /* tmp3 = col3 + col4 */ \
    tmp2 = _mm_add_pi16(col2, col5);            /* tmp2 = col2 + col5 */ \
    tmp4 = _mm_sub_pi16(col3, col4);            /* tmp4 = col3 - col4 */ \
    tmp5 = _mm_sub_pi16(col2, col5);            /* tmp5 = col2 - col5 */ \
    \
    /* Even part */ \
    \
    tmp10 = _mm_add_pi16(tmp0, tmp3);           /* tmp10 = tmp0 + tmp3 */ \
    tmp13 = _mm_sub_pi16(tmp0, tmp3);           /* tmp13 = tmp0 - tmp3 */ \
    tmp11 = _mm_add_pi16(tmp1, tmp2);           /* tmp11 = tmp1 + tmp2 */ \
    tmp12 = _mm_sub_pi16(tmp1, tmp2);           /* tmp12 = tmp1 - tmp2 */ \
    \
    out0 = _mm_add_pi16(tmp10, tmp11);          /* out0 = tmp10 + tmp11 */ \
    out4 = _mm_sub_pi16(tmp10, tmp11);          /* out4 = tmp10 - tmp11 */ \
    out0 = _mm_slli_pi16(out0, PASS1_BITS); \
    out4 = _mm_slli_pi16(out4, PASS1_BITS); \
    \
    DO_FDCT_COMMON(1) \
    \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 0], out0); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 0 + 4], out4); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 1], out1); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 1 + 4], out5); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 2], out2); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 2 + 4], out6); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 3], out3); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 3 + 4], out7); \
  }
  
  #define DO_FDCT_PASS2() { \
    __m64 col0l, col0h, col1l, col1h, col2l, col2h, col3l, col3h; \
    __m64 col01a, col01b, col01c, col01d, col23a, col23b, col23c, col23d; \
    __m64 row0, row1, row2, row3, row4, row5, row6, row7; \
    __m64 tmp10, tmp11; \
    \
    col0l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 0]);  /* (00 10 20 30) */ \
    col1l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 1]);  /* (01 11 21 31) */ \
    col2l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 2]);  /* (02 12 22 32) */ \
    col3l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 3]);  /* (03 13 23 33) */ \
    col0h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 4]);  /* (40 50 60 70) */ \
    col1h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 5]);  /* (41 51 61 71) */ \
    col2h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 6]);  /* (42 52 62 72) */ \
    col3h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 7]);  /* (43 53 63 73) */ \
    \
    /* Transpose coefficients */ \
    \
    col23a = _mm_unpacklo_pi16(col2l, col3l);   /* col23a = (02 03 12 13) */ \
    col23b = _mm_unpackhi_pi16(col2l, col3l);   /* col23b = (22 23 32 33) */ \
    col23c = _mm_unpacklo_pi16(col2h, col3h);   /* col23c = (42 43 52 53) */ \
    col23d = _mm_unpackhi_pi16(col2h, col3h);   /* col23d = (62 63 72 73) */ \
    \
    col01a = _mm_unpacklo_pi16(col0l, col1l);   /* col01a = (00 01 10 11) */ \
    col01b = _mm_unpackhi_pi16(col0l, col1l);   /* col01b = (20 21 30 31) */ \
    col01c = _mm_unpacklo_pi16(col0h, col1h);   /* col01c = (40 41 50 51) */ \
    col01d = _mm_unpackhi_pi16(col0h, col1h);   /* col01d = (60 61 70 71) */ \
    \
    row0 = _mm_unpacklo_pi32(col01a, col23a);   /* row0 = (00 01 02 03) */ \
    row1 = _mm_unpackhi_pi32(col01a, col23a);   /* row1 = (10 11 12 13) */ \
    row6 = _mm_unpacklo_pi32(col01d, col23d);   /* row6 = (60 61 62 63) */ \
    row7 = _mm_unpackhi_pi32(col01d, col23d);   /* row7 = (70 71 72 73) */ \
    \
    tmp6 = _mm_sub_pi16(row1, row6);            /* tmp6 = row1 - row6 */ \
    tmp7 = _mm_sub_pi16(row0, row7);            /* tmp7 = row0 - row7 */ \
    tmp1 = _mm_add_pi16(row1, row6);            /* tmp1 = row1 + row6 */ \
    tmp0 = _mm_add_pi16(row0, row7);            /* tmp0 = row0 + row7 */ \
    \
    row2 = _mm_unpacklo_pi32(col01b, col23b);   /* row2 = (20 21 22 23) */ \
    row3 = _mm_unpackhi_pi32(col01b, col23b);   /* row3 = (30 31 32 33) */ \
    row4 = _mm_unpacklo_pi32(col01c, col23c);   /* row4 = (40 41 42 43) */ \
    row5 = _mm_unpackhi_pi32(col01c, col23c);   /* row5 = (50 51 52 53) */ \
    \
    tmp3 = _mm_add_pi16(row3, row4);            /* tmp3 = row3 + row4 */ \
    tmp2 = _mm_add_pi16(row2, row5);            /* tmp2 = row2 + row5 */ \
    tmp4 = _mm_sub_pi16(row3, row4);            /* tmp4 = row3 - row4 */ \
    tmp5 = _mm_sub_pi16(row2, row5);            /* tmp5 = row2 - row5 */ \
    \
    /* Even part */ \
    \
    tmp10 = _mm_add_pi16(tmp0, tmp3);           /* tmp10 = tmp0 + tmp3 */ \
    tmp13 = _mm_sub_pi16(tmp0, tmp3);           /* tmp13 = tmp0 - tmp3 */ \
    tmp11 = _mm_add_pi16(tmp1, tmp2);           /* tmp11 = tmp1 + tmp2 */ \
    tmp12 = _mm_sub_pi16(tmp1, tmp2);           /* tmp12 = tmp1 - tmp2 */ \
    \
    out0 = _mm_add_pi16(tmp10, tmp11);          /* out0 = tmp10 + tmp11 */ \
    out4 = _mm_sub_pi16(tmp10, tmp11);          /* out4 = tmp10 - tmp11 */ \
    \
    out0 = _mm_add_pi16(out0, PW_DESCALE_P2X); \
    out4 = _mm_add_pi16(out4, PW_DESCALE_P2X); \
    out0 = _mm_srai_pi16(out0, PASS1_BITS); \
    out4 = _mm_srai_pi16(out4, PASS1_BITS); \
    \
    DO_FDCT_COMMON(2) \
    \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 0], out0); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 1], out1); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 2], out2); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 3], out3); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 4], out4); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 5], out5); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 6], out6); \
    _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 7], out7); \
  }
  
  void jsimd_fdct_islow_mmi(DCTELEM *data)
  {
    __m64 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
    __m64 out0, out1, out2, out3, out4, out5, out6, out7;
    __m64 tmp12, tmp13;
    DCTELEM *dataptr = data;
  
    /* Pass 1: process rows. */
  
    DO_FDCT_PASS1()
    dataptr += DCTSIZE * 4;
    DO_FDCT_PASS1()
  
    /* Pass 2: process columns. */
  
    dataptr = data;
    DO_FDCT_PASS2()
    dataptr += 4;
    DO_FDCT_PASS2()
  }
  

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