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| 1 /* |
| 2 * AltiVec optimizations for libjpeg-turbo |
| 3 * |
| 4 * Copyright (C) 2015, D. R. Commander. |
| 5 * All rights reserved. |
| 6 * This software is provided 'as-is', without any express or implied |
| 7 * warranty. In no event will the authors be held liable for any damages |
| 8 * arising from the use of this software. |
| 9 * |
| 10 * Permission is granted to anyone to use this software for any purpose, |
| 11 * including commercial applications, and to alter it and redistribute it |
| 12 * freely, subject to the following restrictions: |
| 13 * |
| 14 * 1. The origin of this software must not be misrepresented; you must not |
| 15 * claim that you wrote the original software. If you use this software |
| 16 * in a product, an acknowledgment in the product documentation would be |
| 17 * appreciated but is not required. |
| 18 * 2. Altered source versions must be plainly marked as such, and must not be |
| 19 * misrepresented as being the original software. |
| 20 * 3. This notice may not be removed or altered from any source distribution. |
| 21 */ |
| 22 |
| 23 /* This file is included by jdmerge-altivec.c */ |
| 24 |
| 25 |
| 26 void jsimd_h2v1_merged_upsample_altivec (JDIMENSION output_width, |
| 27 JSAMPIMAGE input_buf, |
| 28 JDIMENSION in_row_group_ctr, |
| 29 JSAMPARRAY output_buf) |
| 30 { |
| 31 JSAMPROW outptr, inptr0, inptr1, inptr2; |
| 32 int pitch = output_width * RGB_PIXELSIZE, num_cols, yloop; |
| 33 #if __BIG_ENDIAN__ |
| 34 int offset; |
| 35 #endif |
| 36 unsigned char __attribute__((aligned(16))) tmpbuf[RGB_PIXELSIZE * 16]; |
| 37 |
| 38 __vector unsigned char rgb0, rgb1, rgb2, rgbx0, rgbx1, rgbx2, rgbx3, |
| 39 y, cb, cr; |
| 40 #if __BIG_ENDIAN__ |
| 41 __vector unsigned char edgel, edgeh, edges, out0, out1, out2, out3; |
| 42 #if RGB_PIXELSIZE == 4 |
| 43 __vector unsigned char out4; |
| 44 #endif |
| 45 #endif |
| 46 #if RGB_PIXELSIZE == 4 |
| 47 __vector unsigned char rgb3; |
| 48 #endif |
| 49 __vector short rg0, rg1, rg2, rg3, bx0, bx1, bx2, bx3, ye, yo, cbl, cbh, |
| 50 crl, crh, r_yl, r_yh, g_yl, g_yh, b_yl, b_yh, g_y0w, g_y1w, g_y2w, g_y3w, |
| 51 rl, rh, gl, gh, bl, bh, re, ro, ge, go, be, bo; |
| 52 __vector int g_y0, g_y1, g_y2, g_y3; |
| 53 |
| 54 /* Constants |
| 55 * NOTE: The >> 1 is to compensate for the fact that vec_madds() returns 17 |
| 56 * high-order bits, not 16. |
| 57 */ |
| 58 __vector short pw_f0402 = { __8X(F_0_402 >> 1) }, |
| 59 pw_mf0228 = { __8X(-F_0_228 >> 1) }, |
| 60 pw_mf0344_f0285 = { __4X2(-F_0_344, F_0_285) }, |
| 61 pw_one = { __8X(1) }, pw_255 = { __8X(255) }, |
| 62 pw_cj = { __8X(CENTERJSAMPLE) }; |
| 63 __vector int pd_onehalf = { __4X(ONE_HALF) }; |
| 64 __vector unsigned char pb_zero = { __16X(0) }, |
| 65 #if __BIG_ENDIAN__ |
| 66 shift_pack_index = {0,1,4,5,8,9,12,13,16,17,20,21,24,25,28,29}, |
| 67 even_index = {0,16,0,18,0,20,0,22,0,24,0,26,0,28,0,30}, |
| 68 odd_index = {0,17,0,19,0,21,0,23,0,25,0,27,0,29,0,31}; |
| 69 #else |
| 70 shift_pack_index = {2,3,6,7,10,11,14,15,18,19,22,23,26,27,30,31}, |
| 71 even_index = {16,0,18,0,20,0,22,0,24,0,26,0,28,0,30,0}, |
| 72 odd_index = {17,0,19,0,21,0,23,0,25,0,27,0,29,0,31,0}; |
| 73 #endif |
| 74 |
| 75 inptr0 = input_buf[0][in_row_group_ctr]; |
| 76 inptr1 = input_buf[1][in_row_group_ctr]; |
| 77 inptr2 = input_buf[2][in_row_group_ctr]; |
| 78 outptr = output_buf[0]; |
| 79 |
| 80 for (num_cols = pitch; num_cols > 0; inptr1 += 16, inptr2 += 16) { |
| 81 |
| 82 cb = vec_ld(0, inptr1); |
| 83 /* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't |
| 84 * support unsigned vectors. |
| 85 */ |
| 86 cbl = (__vector signed short)VEC_UNPACKHU(cb); |
| 87 cbh = (__vector signed short)VEC_UNPACKLU(cb); |
| 88 cbl = vec_sub(cbl, pw_cj); |
| 89 cbh = vec_sub(cbh, pw_cj); |
| 90 |
| 91 cr = vec_ld(0, inptr2); |
| 92 crl = (__vector signed short)VEC_UNPACKHU(cr); |
| 93 crh = (__vector signed short)VEC_UNPACKLU(cr); |
| 94 crl = vec_sub(crl, pw_cj); |
| 95 crh = vec_sub(crh, pw_cj); |
| 96 |
| 97 /* (Original) |
| 98 * R = Y + 1.40200 * Cr |
| 99 * G = Y - 0.34414 * Cb - 0.71414 * Cr |
| 100 * B = Y + 1.77200 * Cb |
| 101 * |
| 102 * (This implementation) |
| 103 * R = Y + 0.40200 * Cr + Cr |
| 104 * G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr |
| 105 * B = Y - 0.22800 * Cb + Cb + Cb |
| 106 */ |
| 107 b_yl = vec_add(cbl, cbl); |
| 108 b_yh = vec_add(cbh, cbh); |
| 109 b_yl = vec_madds(b_yl, pw_mf0228, pw_one); |
| 110 b_yh = vec_madds(b_yh, pw_mf0228, pw_one); |
| 111 b_yl = vec_sra(b_yl, (__vector unsigned short)pw_one); |
| 112 b_yh = vec_sra(b_yh, (__vector unsigned short)pw_one); |
| 113 b_yl = vec_add(b_yl, cbl); |
| 114 b_yh = vec_add(b_yh, cbh); |
| 115 b_yl = vec_add(b_yl, cbl); |
| 116 b_yh = vec_add(b_yh, cbh); |
| 117 |
| 118 r_yl = vec_add(crl, crl); |
| 119 r_yh = vec_add(crh, crh); |
| 120 r_yl = vec_madds(r_yl, pw_f0402, pw_one); |
| 121 r_yh = vec_madds(r_yh, pw_f0402, pw_one); |
| 122 r_yl = vec_sra(r_yl, (__vector unsigned short)pw_one); |
| 123 r_yh = vec_sra(r_yh, (__vector unsigned short)pw_one); |
| 124 r_yl = vec_add(r_yl, crl); |
| 125 r_yh = vec_add(r_yh, crh); |
| 126 |
| 127 g_y0w = vec_mergeh(cbl, crl); |
| 128 g_y1w = vec_mergel(cbl, crl); |
| 129 g_y0 = vec_msums(g_y0w, pw_mf0344_f0285, pd_onehalf); |
| 130 g_y1 = vec_msums(g_y1w, pw_mf0344_f0285, pd_onehalf); |
| 131 g_y2w = vec_mergeh(cbh, crh); |
| 132 g_y3w = vec_mergel(cbh, crh); |
| 133 g_y2 = vec_msums(g_y2w, pw_mf0344_f0285, pd_onehalf); |
| 134 g_y3 = vec_msums(g_y3w, pw_mf0344_f0285, pd_onehalf); |
| 135 /* Clever way to avoid 4 shifts + 2 packs. This packs the high word from |
| 136 * each dword into a new 16-bit vector, which is the equivalent of |
| 137 * descaling the 32-bit results (right-shifting by 16 bits) and then |
| 138 * packing them. |
| 139 */ |
| 140 g_yl = vec_perm((__vector short)g_y0, (__vector short)g_y1, |
| 141 shift_pack_index); |
| 142 g_yh = vec_perm((__vector short)g_y2, (__vector short)g_y3, |
| 143 shift_pack_index); |
| 144 g_yl = vec_sub(g_yl, crl); |
| 145 g_yh = vec_sub(g_yh, crh); |
| 146 |
| 147 for (yloop = 0; yloop < 2 && num_cols > 0; yloop++, |
| 148 num_cols -= RGB_PIXELSIZE * 16, |
| 149 outptr += RGB_PIXELSIZE * 16, inptr0 += 16) { |
| 150 |
| 151 y = vec_ld(0, inptr0); |
| 152 ye = (__vector signed short)vec_perm(pb_zero, y, even_index); |
| 153 yo = (__vector signed short)vec_perm(pb_zero, y, odd_index); |
| 154 |
| 155 if (yloop == 0) { |
| 156 be = vec_add(b_yl, ye); |
| 157 bo = vec_add(b_yl, yo); |
| 158 re = vec_add(r_yl, ye); |
| 159 ro = vec_add(r_yl, yo); |
| 160 ge = vec_add(g_yl, ye); |
| 161 go = vec_add(g_yl, yo); |
| 162 } else { |
| 163 be = vec_add(b_yh, ye); |
| 164 bo = vec_add(b_yh, yo); |
| 165 re = vec_add(r_yh, ye); |
| 166 ro = vec_add(r_yh, yo); |
| 167 ge = vec_add(g_yh, ye); |
| 168 go = vec_add(g_yh, yo); |
| 169 } |
| 170 |
| 171 rl = vec_mergeh(re, ro); |
| 172 rh = vec_mergel(re, ro); |
| 173 gl = vec_mergeh(ge, go); |
| 174 gh = vec_mergel(ge, go); |
| 175 bl = vec_mergeh(be, bo); |
| 176 bh = vec_mergel(be, bo); |
| 177 |
| 178 rg0 = vec_mergeh(rl, gl); |
| 179 bx0 = vec_mergeh(bl, pw_255); |
| 180 rg1 = vec_mergel(rl, gl); |
| 181 bx1 = vec_mergel(bl, pw_255); |
| 182 rg2 = vec_mergeh(rh, gh); |
| 183 bx2 = vec_mergeh(bh, pw_255); |
| 184 rg3 = vec_mergel(rh, gh); |
| 185 bx3 = vec_mergel(bh, pw_255); |
| 186 |
| 187 rgbx0 = vec_packsu(rg0, bx0); |
| 188 rgbx1 = vec_packsu(rg1, bx1); |
| 189 rgbx2 = vec_packsu(rg2, bx2); |
| 190 rgbx3 = vec_packsu(rg3, bx3); |
| 191 |
| 192 #if RGB_PIXELSIZE == 3 |
| 193 /* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3 |
| 194 * rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7 |
| 195 * rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb |
| 196 * rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf |
| 197 * |
| 198 * rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5 |
| 199 * rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga |
| 200 * rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf |
| 201 */ |
| 202 rgb0 = vec_perm(rgbx0, rgbx1, (__vector unsigned char)RGB_INDEX0); |
| 203 rgb1 = vec_perm(rgbx1, rgbx2, (__vector unsigned char)RGB_INDEX1); |
| 204 rgb2 = vec_perm(rgbx2, rgbx3, (__vector unsigned char)RGB_INDEX2); |
| 205 #else |
| 206 /* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3 |
| 207 * rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7 |
| 208 * rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb |
| 209 * rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf |
| 210 * |
| 211 * rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3 |
| 212 * rgb1 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7 |
| 213 * rgb2 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb |
| 214 * rgb3 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf |
| 215 */ |
| 216 rgb0 = vec_perm(rgbx0, rgbx0, (__vector unsigned char)RGB_INDEX); |
| 217 rgb1 = vec_perm(rgbx1, rgbx1, (__vector unsigned char)RGB_INDEX); |
| 218 rgb2 = vec_perm(rgbx2, rgbx2, (__vector unsigned char)RGB_INDEX); |
| 219 rgb3 = vec_perm(rgbx3, rgbx3, (__vector unsigned char)RGB_INDEX); |
| 220 #endif |
| 221 |
| 222 #if __BIG_ENDIAN__ |
| 223 offset = (size_t)outptr & 15; |
| 224 if (offset) { |
| 225 __vector unsigned char unaligned_shift_index; |
| 226 int bytes = num_cols + offset; |
| 227 |
| 228 if (bytes < (RGB_PIXELSIZE + 1) * 16 && (bytes & 15)) { |
| 229 /* Slow path to prevent buffer overwrite. Since there is no way to |
| 230 * write a partial AltiVec register, overwrite would occur on the |
| 231 * last chunk of the last image row if the right edge is not on a |
| 232 * 16-byte boundary. It could also occur on other rows if the bytes |
| 233 * per row is low enough. Since we can't determine whether we're on |
| 234 * the last image row, we have to assume every row is the last. |
| 235 */ |
| 236 vec_st(rgb0, 0, tmpbuf); |
| 237 vec_st(rgb1, 16, tmpbuf); |
| 238 vec_st(rgb2, 32, tmpbuf); |
| 239 #if RGB_PIXELSIZE == 4 |
| 240 vec_st(rgb3, 48, tmpbuf); |
| 241 #endif |
| 242 memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16)); |
| 243 } else { |
| 244 /* Fast path */ |
| 245 unaligned_shift_index = vec_lvsl(0, outptr); |
| 246 edgel = vec_ld(0, outptr); |
| 247 edgeh = vec_ld(min(num_cols - 1, RGB_PIXELSIZE * 16), outptr); |
| 248 edges = vec_perm(edgeh, edgel, unaligned_shift_index); |
| 249 unaligned_shift_index = vec_lvsr(0, outptr); |
| 250 out0 = vec_perm(edges, rgb0, unaligned_shift_index); |
| 251 out1 = vec_perm(rgb0, rgb1, unaligned_shift_index); |
| 252 out2 = vec_perm(rgb1, rgb2, unaligned_shift_index); |
| 253 #if RGB_PIXELSIZE == 4 |
| 254 out3 = vec_perm(rgb2, rgb3, unaligned_shift_index); |
| 255 out4 = vec_perm(rgb3, edges, unaligned_shift_index); |
| 256 #else |
| 257 out3 = vec_perm(rgb2, edges, unaligned_shift_index); |
| 258 #endif |
| 259 vec_st(out0, 0, outptr); |
| 260 if (bytes > 16) |
| 261 vec_st(out1, 16, outptr); |
| 262 if (bytes > 32) |
| 263 vec_st(out2, 32, outptr); |
| 264 if (bytes > 48) |
| 265 vec_st(out3, 48, outptr); |
| 266 #if RGB_PIXELSIZE == 4 |
| 267 if (bytes > 64) |
| 268 vec_st(out4, 64, outptr); |
| 269 #endif |
| 270 } |
| 271 } else { |
| 272 #endif /* __BIG_ENDIAN__ */ |
| 273 if (num_cols < RGB_PIXELSIZE * 16 && (num_cols & 15)) { |
| 274 /* Slow path */ |
| 275 VEC_ST(rgb0, 0, tmpbuf); |
| 276 VEC_ST(rgb1, 16, tmpbuf); |
| 277 VEC_ST(rgb2, 32, tmpbuf); |
| 278 #if RGB_PIXELSIZE == 4 |
| 279 VEC_ST(rgb3, 48, tmpbuf); |
| 280 #endif |
| 281 memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16)); |
| 282 } else { |
| 283 /* Fast path */ |
| 284 VEC_ST(rgb0, 0, outptr); |
| 285 if (num_cols > 16) |
| 286 VEC_ST(rgb1, 16, outptr); |
| 287 if (num_cols > 32) |
| 288 VEC_ST(rgb2, 32, outptr); |
| 289 #if RGB_PIXELSIZE == 4 |
| 290 if (num_cols > 48) |
| 291 VEC_ST(rgb3, 48, outptr); |
| 292 #endif |
| 293 } |
| 294 #if __BIG_ENDIAN__ |
| 295 } |
| 296 #endif |
| 297 } |
| 298 } |
| 299 } |
| 300 |
| 301 |
| 302 void jsimd_h2v2_merged_upsample_altivec (JDIMENSION output_width, |
| 303 JSAMPIMAGE input_buf, |
| 304 JDIMENSION in_row_group_ctr, |
| 305 JSAMPARRAY output_buf) |
| 306 { |
| 307 JSAMPROW inptr, outptr; |
| 308 |
| 309 inptr = input_buf[0][in_row_group_ctr]; |
| 310 outptr = output_buf[0]; |
| 311 |
| 312 input_buf[0][in_row_group_ctr] = input_buf[0][in_row_group_ctr * 2]; |
| 313 jsimd_h2v1_merged_upsample_altivec(output_width, input_buf, in_row_group_ctr, |
| 314 output_buf); |
| 315 |
| 316 input_buf[0][in_row_group_ctr] = input_buf[0][in_row_group_ctr * 2 + 1]; |
| 317 output_buf[0] = output_buf[1]; |
| 318 jsimd_h2v1_merged_upsample_altivec(output_width, input_buf, in_row_group_ctr, |
| 319 output_buf); |
| 320 |
| 321 input_buf[0][in_row_group_ctr] = inptr; |
| 322 output_buf[0] = outptr; |
| 323 } |
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