kc3-lang/libjpeg-turbo/simd/powerpc/jdmrgext-altivec.c

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• Hash : 602f0592
  Author :
  Date : 2024-12-12T00:09:34
  

  AltiVec: Disable/Fix some strict compiler warnings
  
  We use a standard set of strict compiler warnings with Clang and GCC to
  continuously test and maintain C89 conformance in the libjpeg API code.
  However, SIMD extensions need not comply with that.  The AltiVec code
  specifically uses some C99isms, so disable -Wc99-extensions and
  -Wpedantic in the scope of that code.  Also disable -Wshadow, because
  I'm too lazy to fix the TRANSPOSE() macro.  Also
  use #ifdef __BIG_ENDIAN__ and #if defined(__BIG_ENDIAN__) instead
  of #if __BIG_ENDIAN__
  

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• simd/powerpc/jdmrgext-altivec.c

• /*
   * AltiVec optimizations for libjpeg-turbo
   *
   * Copyright (C) 2015, 2024, D. R. Commander.  All Rights Reserved.
   *
   * 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.
   */
  
  /* This file is included by jdmerge-altivec.c */
  
  
  void jsimd_h2v1_merged_upsample_altivec(JDIMENSION output_width,
                                          JSAMPIMAGE input_buf,
                                          JDIMENSION in_row_group_ctr,
                                          JSAMPARRAY output_buf)
  {
    JSAMPROW outptr, inptr0, inptr1, inptr2;
    int pitch = output_width * RGB_PIXELSIZE, num_cols, yloop;
  #ifdef __BIG_ENDIAN__
    int offset;
  #endif
    unsigned char __attribute__((aligned(16))) tmpbuf[RGB_PIXELSIZE * 16];
  
    __vector unsigned char rgb0, rgb1, rgb2, rgbx0, rgbx1, rgbx2, rgbx3,
      y, cb, cr;
  #ifdef __BIG_ENDIAN__
    __vector unsigned char edgel, edgeh, edges, out0, out1, out2, out3;
  #if RGB_PIXELSIZE == 4
    __vector unsigned char out4;
  #endif
  #endif
  #if RGB_PIXELSIZE == 4
    __vector unsigned char rgb3;
  #endif
    __vector short rg0, rg1, rg2, rg3, bx0, bx1, bx2, bx3, ye, yo, cbl, cbh,
      crl, crh, r_yl, r_yh, g_yl, g_yh, b_yl, b_yh, g_y0w, g_y1w, g_y2w, g_y3w,
      rl, rh, gl, gh, bl, bh, re, ro, ge, go, be, bo;
    __vector int g_y0, g_y1, g_y2, g_y3;
  
    /* Constants
     * NOTE: The >> 1 is to compensate for the fact that vec_madds() returns 17
     * high-order bits, not 16.
     */
    __vector short pw_f0402 = { __8X(F_0_402 >> 1) },
      pw_mf0228 = { __8X(-F_0_228 >> 1) },
      pw_mf0344_f0285 = { __4X2(-F_0_344, F_0_285) },
      pw_one = { __8X(1) }, pw_255 = { __8X(255) },
      pw_cj = { __8X(CENTERJSAMPLE) };
    __vector int pd_onehalf = { __4X(ONE_HALF) };
    __vector unsigned char pb_zero = { __16X(0) },
  #ifdef __BIG_ENDIAN__
      shift_pack_index =
        {  0,  1,  4,  5,  8,  9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29 },
      even_index =
        {  0, 16,  0, 18,  0, 20,  0, 22,  0, 24,  0, 26,  0, 28,  0, 30 },
      odd_index =
        {  0, 17,  0, 19,  0, 21,  0, 23,  0, 25,  0, 27,  0, 29,  0, 31 };
  #else
      shift_pack_index =
        {  2,  3,  6,  7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31 },
      even_index =
        { 16,  0, 18,  0, 20,  0, 22,  0, 24,  0, 26,  0, 28,  0, 30,  0 },
      odd_index =
        { 17,  0, 19,  0, 21,  0, 23,  0, 25,  0, 27,  0, 29,  0, 31,  0 };
  #endif
  
    inptr0 = input_buf[0][in_row_group_ctr];
    inptr1 = input_buf[1][in_row_group_ctr];
    inptr2 = input_buf[2][in_row_group_ctr];
    outptr = output_buf[0];
  
    for (num_cols = pitch; num_cols > 0; inptr1 += 16, inptr2 += 16) {
  
      cb = vec_ld(0, inptr1);
      /* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't
       * support unsigned vectors.
       */
      cbl = (__vector signed short)VEC_UNPACKHU(cb);
      cbh = (__vector signed short)VEC_UNPACKLU(cb);
      cbl = vec_sub(cbl, pw_cj);
      cbh = vec_sub(cbh, pw_cj);
  
      cr = vec_ld(0, inptr2);
      crl = (__vector signed short)VEC_UNPACKHU(cr);
      crh = (__vector signed short)VEC_UNPACKLU(cr);
      crl = vec_sub(crl, pw_cj);
      crh = vec_sub(crh, pw_cj);
  
      /* (Original)
       * R = Y                + 1.40200 * Cr
       * G = Y - 0.34414 * Cb - 0.71414 * Cr
       * B = Y + 1.77200 * Cb
       *
       * (This implementation)
       * R = Y                + 0.40200 * Cr + Cr
       * G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
       * B = Y - 0.22800 * Cb + Cb + Cb
       */
      b_yl = vec_add(cbl, cbl);
      b_yh = vec_add(cbh, cbh);
      b_yl = vec_madds(b_yl, pw_mf0228, pw_one);
      b_yh = vec_madds(b_yh, pw_mf0228, pw_one);
      b_yl = vec_sra(b_yl, (__vector unsigned short)pw_one);
      b_yh = vec_sra(b_yh, (__vector unsigned short)pw_one);
      b_yl = vec_add(b_yl, cbl);
      b_yh = vec_add(b_yh, cbh);
      b_yl = vec_add(b_yl, cbl);
      b_yh = vec_add(b_yh, cbh);
  
      r_yl = vec_add(crl, crl);
      r_yh = vec_add(crh, crh);
      r_yl = vec_madds(r_yl, pw_f0402, pw_one);
      r_yh = vec_madds(r_yh, pw_f0402, pw_one);
      r_yl = vec_sra(r_yl, (__vector unsigned short)pw_one);
      r_yh = vec_sra(r_yh, (__vector unsigned short)pw_one);
      r_yl = vec_add(r_yl, crl);
      r_yh = vec_add(r_yh, crh);
  
      g_y0w = vec_mergeh(cbl, crl);
      g_y1w = vec_mergel(cbl, crl);
      g_y0 = vec_msums(g_y0w, pw_mf0344_f0285, pd_onehalf);
      g_y1 = vec_msums(g_y1w, pw_mf0344_f0285, pd_onehalf);
      g_y2w = vec_mergeh(cbh, crh);
      g_y3w = vec_mergel(cbh, crh);
      g_y2 = vec_msums(g_y2w, pw_mf0344_f0285, pd_onehalf);
      g_y3 = vec_msums(g_y3w, pw_mf0344_f0285, pd_onehalf);
      /* Clever way to avoid 4 shifts + 2 packs.  This packs the high word from
       * each dword into a new 16-bit vector, which is the equivalent of
       * descaling the 32-bit results (right-shifting by 16 bits) and then
       * packing them.
       */
      g_yl = vec_perm((__vector short)g_y0, (__vector short)g_y1,
                      shift_pack_index);
      g_yh = vec_perm((__vector short)g_y2, (__vector short)g_y3,
                      shift_pack_index);
      g_yl = vec_sub(g_yl, crl);
      g_yh = vec_sub(g_yh, crh);
  
      for (yloop = 0; yloop < 2 && num_cols > 0; yloop++,
           num_cols -= RGB_PIXELSIZE * 16,
           outptr += RGB_PIXELSIZE * 16, inptr0 += 16) {
  
        y = vec_ld(0, inptr0);
        ye = (__vector signed short)vec_perm(pb_zero, y, even_index);
        yo = (__vector signed short)vec_perm(pb_zero, y, odd_index);
  
        if (yloop == 0) {
          be = vec_add(b_yl, ye);
          bo = vec_add(b_yl, yo);
          re = vec_add(r_yl, ye);
          ro = vec_add(r_yl, yo);
          ge = vec_add(g_yl, ye);
          go = vec_add(g_yl, yo);
        } else {
          be = vec_add(b_yh, ye);
          bo = vec_add(b_yh, yo);
          re = vec_add(r_yh, ye);
          ro = vec_add(r_yh, yo);
          ge = vec_add(g_yh, ye);
          go = vec_add(g_yh, yo);
        }
  
        rl = vec_mergeh(re, ro);
        rh = vec_mergel(re, ro);
        gl = vec_mergeh(ge, go);
        gh = vec_mergel(ge, go);
        bl = vec_mergeh(be, bo);
        bh = vec_mergel(be, bo);
  
        rg0 = vec_mergeh(rl, gl);
        bx0 = vec_mergeh(bl, pw_255);
        rg1 = vec_mergel(rl, gl);
        bx1 = vec_mergel(bl, pw_255);
        rg2 = vec_mergeh(rh, gh);
        bx2 = vec_mergeh(bh, pw_255);
        rg3 = vec_mergel(rh, gh);
        bx3 = vec_mergel(bh, pw_255);
  
        rgbx0 = vec_packsu(rg0, bx0);
        rgbx1 = vec_packsu(rg1, bx1);
        rgbx2 = vec_packsu(rg2, bx2);
        rgbx3 = vec_packsu(rg3, bx3);
  
  #if RGB_PIXELSIZE == 3
        /* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3
         * rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7
         * rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb
         * rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf
         *
         * rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5
         * rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga
         * rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf
         */
        rgb0 = vec_perm(rgbx0, rgbx1, (__vector unsigned char)RGB_INDEX0);
        rgb1 = vec_perm(rgbx1, rgbx2, (__vector unsigned char)RGB_INDEX1);
        rgb2 = vec_perm(rgbx2, rgbx3, (__vector unsigned char)RGB_INDEX2);
  #else
        /* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3
         * rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7
         * rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb
         * rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf
         *
         * rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3
         * rgb1 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7
         * rgb2 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb
         * rgb3 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf
         */
        rgb0 = vec_perm(rgbx0, rgbx0, (__vector unsigned char)RGB_INDEX);
        rgb1 = vec_perm(rgbx1, rgbx1, (__vector unsigned char)RGB_INDEX);
        rgb2 = vec_perm(rgbx2, rgbx2, (__vector unsigned char)RGB_INDEX);
        rgb3 = vec_perm(rgbx3, rgbx3, (__vector unsigned char)RGB_INDEX);
  #endif
  
  #ifdef __BIG_ENDIAN__
        offset = (size_t)outptr & 15;
        if (offset) {
          __vector unsigned char unaligned_shift_index;
          int bytes = num_cols + offset;
  
          if (bytes < (RGB_PIXELSIZE + 1) * 16 && (bytes & 15)) {
            /* Slow path to prevent buffer overwrite.  Since there is no way to
             * write a partial AltiVec register, overwrite would occur on the
             * last chunk of the last image row if the right edge is not on a
             * 16-byte boundary.  It could also occur on other rows if the bytes
             * per row is low enough.  Since we can't determine whether we're on
             * the last image row, we have to assume every row is the last.
             */
            vec_st(rgb0, 0, tmpbuf);
            vec_st(rgb1, 16, tmpbuf);
            vec_st(rgb2, 32, tmpbuf);
  #if RGB_PIXELSIZE == 4
            vec_st(rgb3, 48, tmpbuf);
  #endif
            memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16));
          } else {
            /* Fast path */
            unaligned_shift_index = vec_lvsl(0, outptr);
            edgel = vec_ld(0, outptr);
            edgeh = vec_ld(min(num_cols - 1, RGB_PIXELSIZE * 16), outptr);
            edges = vec_perm(edgeh, edgel, unaligned_shift_index);
            unaligned_shift_index = vec_lvsr(0, outptr);
            out0 = vec_perm(edges, rgb0, unaligned_shift_index);
            out1 = vec_perm(rgb0, rgb1, unaligned_shift_index);
            out2 = vec_perm(rgb1, rgb2, unaligned_shift_index);
  #if RGB_PIXELSIZE == 4
            out3 = vec_perm(rgb2, rgb3, unaligned_shift_index);
            out4 = vec_perm(rgb3, edges, unaligned_shift_index);
  #else
            out3 = vec_perm(rgb2, edges, unaligned_shift_index);
  #endif
            vec_st(out0, 0, outptr);
            if (bytes > 16)
              vec_st(out1, 16, outptr);
            if (bytes > 32)
              vec_st(out2, 32, outptr);
            if (bytes > 48)
              vec_st(out3, 48, outptr);
  #if RGB_PIXELSIZE == 4
            if (bytes > 64)
              vec_st(out4, 64, outptr);
  #endif
          }
        } else {
  #endif /* __BIG_ENDIAN__ */
          if (num_cols < RGB_PIXELSIZE * 16 && (num_cols & 15)) {
            /* Slow path */
            VEC_ST(rgb0, 0, tmpbuf);
            VEC_ST(rgb1, 16, tmpbuf);
            VEC_ST(rgb2, 32, tmpbuf);
  #if RGB_PIXELSIZE == 4
            VEC_ST(rgb3, 48, tmpbuf);
  #endif
            memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16));
          } else {
            /* Fast path */
            VEC_ST(rgb0, 0, outptr);
            if (num_cols > 16)
              VEC_ST(rgb1, 16, outptr);
            if (num_cols > 32)
              VEC_ST(rgb2, 32, outptr);
  #if RGB_PIXELSIZE == 4
            if (num_cols > 48)
              VEC_ST(rgb3, 48, outptr);
  #endif
          }
  #ifdef __BIG_ENDIAN__
        }
  #endif
      }
    }
  }
  
  
  void jsimd_h2v2_merged_upsample_altivec(JDIMENSION output_width,
                                          JSAMPIMAGE input_buf,
                                          JDIMENSION in_row_group_ctr,
                                          JSAMPARRAY output_buf)
  {
    JSAMPROW inptr, outptr;
  
    inptr = input_buf[0][in_row_group_ctr];
    outptr = output_buf[0];
  
    input_buf[0][in_row_group_ctr] = input_buf[0][in_row_group_ctr * 2];
    jsimd_h2v1_merged_upsample_altivec(output_width, input_buf, in_row_group_ctr,
                                       output_buf);
  
    input_buf[0][in_row_group_ctr] = input_buf[0][in_row_group_ctr * 2 + 1];
    output_buf[0] = output_buf[1];
    jsimd_h2v1_merged_upsample_altivec(output_width, input_buf, in_row_group_ctr,
                                       output_buf);
  
    input_buf[0][in_row_group_ctr] = inptr;
    output_buf[0] = outptr;
  }
  

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