277 lines
10 KiB
C
277 lines
10 KiB
C
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/*
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* AltiVec optimizations for libjpeg-turbo
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*
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* Copyright (C) 2015, D. R. Commander. All Rights Reserved.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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/* This file is included by jdcolor-altivec.c */
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void jsimd_ycc_rgb_convert_altivec(JDIMENSION out_width, JSAMPIMAGE input_buf,
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JDIMENSION input_row, JSAMPARRAY output_buf,
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int num_rows)
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{
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JSAMPROW outptr, inptr0, inptr1, inptr2;
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int pitch = out_width * RGB_PIXELSIZE, num_cols;
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#if __BIG_ENDIAN__
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int offset;
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#endif
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unsigned char __attribute__((aligned(16))) tmpbuf[RGB_PIXELSIZE * 16];
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__vector unsigned char rgb0, rgb1, rgb2, rgbx0, rgbx1, rgbx2, rgbx3,
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y, cb, cr;
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#if __BIG_ENDIAN__
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__vector unsigned char edgel, edgeh, edges, out0, out1, out2, out3;
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#if RGB_PIXELSIZE == 4
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__vector unsigned char out4;
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#endif
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#endif
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#if RGB_PIXELSIZE == 4
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__vector unsigned char rgb3;
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#endif
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__vector short rg0, rg1, rg2, rg3, bx0, bx1, bx2, bx3, yl, yh, cbl, cbh,
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crl, crh, rl, rh, gl, gh, bl, bh, g0w, g1w, g2w, g3w;
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__vector int g0, g1, g2, g3;
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/* Constants
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* NOTE: The >> 1 is to compensate for the fact that vec_madds() returns 17
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* high-order bits, not 16.
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*/
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__vector short pw_f0402 = { __8X(F_0_402 >> 1) },
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pw_mf0228 = { __8X(-F_0_228 >> 1) },
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pw_mf0344_f0285 = { __4X2(-F_0_344, F_0_285) },
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pw_one = { __8X(1) }, pw_255 = { __8X(255) },
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pw_cj = { __8X(CENTERJSAMPLE) };
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__vector int pd_onehalf = { __4X(ONE_HALF) };
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__vector unsigned char pb_zero = { __16X(0) },
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#if __BIG_ENDIAN__
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shift_pack_index =
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{ 0, 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29 };
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#else
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shift_pack_index =
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{ 2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31 };
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#endif
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while (--num_rows >= 0) {
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inptr0 = input_buf[0][input_row];
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inptr1 = input_buf[1][input_row];
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inptr2 = input_buf[2][input_row];
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input_row++;
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outptr = *output_buf++;
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for (num_cols = pitch; num_cols > 0;
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num_cols -= RGB_PIXELSIZE * 16, outptr += RGB_PIXELSIZE * 16,
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inptr0 += 16, inptr1 += 16, inptr2 += 16) {
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y = vec_ld(0, inptr0);
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/* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't
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* support unsigned vectors.
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*/
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yl = (__vector signed short)VEC_UNPACKHU(y);
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yh = (__vector signed short)VEC_UNPACKLU(y);
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cb = vec_ld(0, inptr1);
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cbl = (__vector signed short)VEC_UNPACKHU(cb);
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cbh = (__vector signed short)VEC_UNPACKLU(cb);
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cbl = vec_sub(cbl, pw_cj);
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cbh = vec_sub(cbh, pw_cj);
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cr = vec_ld(0, inptr2);
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crl = (__vector signed short)VEC_UNPACKHU(cr);
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crh = (__vector signed short)VEC_UNPACKLU(cr);
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crl = vec_sub(crl, pw_cj);
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crh = vec_sub(crh, pw_cj);
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/* (Original)
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* R = Y + 1.40200 * Cr
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* G = Y - 0.34414 * Cb - 0.71414 * Cr
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* B = Y + 1.77200 * Cb
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*
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* (This implementation)
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* R = Y + 0.40200 * Cr + Cr
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* G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
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* B = Y - 0.22800 * Cb + Cb + Cb
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*/
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bl = vec_add(cbl, cbl);
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bh = vec_add(cbh, cbh);
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bl = vec_madds(bl, pw_mf0228, pw_one);
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bh = vec_madds(bh, pw_mf0228, pw_one);
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bl = vec_sra(bl, (__vector unsigned short)pw_one);
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bh = vec_sra(bh, (__vector unsigned short)pw_one);
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bl = vec_add(bl, cbl);
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bh = vec_add(bh, cbh);
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bl = vec_add(bl, cbl);
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bh = vec_add(bh, cbh);
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bl = vec_add(bl, yl);
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bh = vec_add(bh, yh);
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rl = vec_add(crl, crl);
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rh = vec_add(crh, crh);
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rl = vec_madds(rl, pw_f0402, pw_one);
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rh = vec_madds(rh, pw_f0402, pw_one);
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rl = vec_sra(rl, (__vector unsigned short)pw_one);
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rh = vec_sra(rh, (__vector unsigned short)pw_one);
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rl = vec_add(rl, crl);
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rh = vec_add(rh, crh);
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rl = vec_add(rl, yl);
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rh = vec_add(rh, yh);
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g0w = vec_mergeh(cbl, crl);
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g1w = vec_mergel(cbl, crl);
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g0 = vec_msums(g0w, pw_mf0344_f0285, pd_onehalf);
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g1 = vec_msums(g1w, pw_mf0344_f0285, pd_onehalf);
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g2w = vec_mergeh(cbh, crh);
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g3w = vec_mergel(cbh, crh);
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g2 = vec_msums(g2w, pw_mf0344_f0285, pd_onehalf);
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g3 = vec_msums(g3w, pw_mf0344_f0285, pd_onehalf);
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/* Clever way to avoid 4 shifts + 2 packs. This packs the high word from
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* each dword into a new 16-bit vector, which is the equivalent of
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* descaling the 32-bit results (right-shifting by 16 bits) and then
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* packing them.
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*/
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gl = vec_perm((__vector short)g0, (__vector short)g1, shift_pack_index);
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gh = vec_perm((__vector short)g2, (__vector short)g3, shift_pack_index);
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gl = vec_sub(gl, crl);
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gh = vec_sub(gh, crh);
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gl = vec_add(gl, yl);
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gh = vec_add(gh, yh);
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rg0 = vec_mergeh(rl, gl);
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bx0 = vec_mergeh(bl, pw_255);
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rg1 = vec_mergel(rl, gl);
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bx1 = vec_mergel(bl, pw_255);
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rg2 = vec_mergeh(rh, gh);
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bx2 = vec_mergeh(bh, pw_255);
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rg3 = vec_mergel(rh, gh);
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bx3 = vec_mergel(bh, pw_255);
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rgbx0 = vec_packsu(rg0, bx0);
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rgbx1 = vec_packsu(rg1, bx1);
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rgbx2 = vec_packsu(rg2, bx2);
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rgbx3 = vec_packsu(rg3, bx3);
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#if RGB_PIXELSIZE == 3
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/* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3
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* rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7
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* rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb
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* rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf
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*
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* rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5
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* rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga
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* rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf
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*/
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rgb0 = vec_perm(rgbx0, rgbx1, (__vector unsigned char)RGB_INDEX0);
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rgb1 = vec_perm(rgbx1, rgbx2, (__vector unsigned char)RGB_INDEX1);
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rgb2 = vec_perm(rgbx2, rgbx3, (__vector unsigned char)RGB_INDEX2);
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#else
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/* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3
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* rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7
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* rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb
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* rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf
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*
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* rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3
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* rgb1 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7
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* rgb2 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb
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* rgb3 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf
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*/
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rgb0 = vec_perm(rgbx0, rgbx0, (__vector unsigned char)RGB_INDEX);
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rgb1 = vec_perm(rgbx1, rgbx1, (__vector unsigned char)RGB_INDEX);
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rgb2 = vec_perm(rgbx2, rgbx2, (__vector unsigned char)RGB_INDEX);
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rgb3 = vec_perm(rgbx3, rgbx3, (__vector unsigned char)RGB_INDEX);
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#endif
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#if __BIG_ENDIAN__
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offset = (size_t)outptr & 15;
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if (offset) {
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__vector unsigned char unaligned_shift_index;
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int bytes = num_cols + offset;
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if (bytes < (RGB_PIXELSIZE + 1) * 16 && (bytes & 15)) {
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/* Slow path to prevent buffer overwrite. Since there is no way to
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* write a partial AltiVec register, overwrite would occur on the
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* last chunk of the last image row if the right edge is not on a
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* 16-byte boundary. It could also occur on other rows if the bytes
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* per row is low enough. Since we can't determine whether we're on
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* the last image row, we have to assume every row is the last.
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*/
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vec_st(rgb0, 0, tmpbuf);
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vec_st(rgb1, 16, tmpbuf);
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vec_st(rgb2, 32, tmpbuf);
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#if RGB_PIXELSIZE == 4
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vec_st(rgb3, 48, tmpbuf);
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#endif
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memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16));
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} else {
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/* Fast path */
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unaligned_shift_index = vec_lvsl(0, outptr);
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edgel = vec_ld(0, outptr);
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edgeh = vec_ld(min(num_cols - 1, RGB_PIXELSIZE * 16), outptr);
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edges = vec_perm(edgeh, edgel, unaligned_shift_index);
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unaligned_shift_index = vec_lvsr(0, outptr);
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out0 = vec_perm(edges, rgb0, unaligned_shift_index);
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out1 = vec_perm(rgb0, rgb1, unaligned_shift_index);
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out2 = vec_perm(rgb1, rgb2, unaligned_shift_index);
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#if RGB_PIXELSIZE == 4
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out3 = vec_perm(rgb2, rgb3, unaligned_shift_index);
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out4 = vec_perm(rgb3, edges, unaligned_shift_index);
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#else
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out3 = vec_perm(rgb2, edges, unaligned_shift_index);
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#endif
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vec_st(out0, 0, outptr);
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if (bytes > 16)
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vec_st(out1, 16, outptr);
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if (bytes > 32)
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vec_st(out2, 32, outptr);
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if (bytes > 48)
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vec_st(out3, 48, outptr);
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#if RGB_PIXELSIZE == 4
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if (bytes > 64)
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vec_st(out4, 64, outptr);
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#endif
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}
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} else {
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#endif /* __BIG_ENDIAN__ */
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if (num_cols < RGB_PIXELSIZE * 16 && (num_cols & 15)) {
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/* Slow path */
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VEC_ST(rgb0, 0, tmpbuf);
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VEC_ST(rgb1, 16, tmpbuf);
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VEC_ST(rgb2, 32, tmpbuf);
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#if RGB_PIXELSIZE == 4
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VEC_ST(rgb3, 48, tmpbuf);
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#endif
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memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16));
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} else {
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/* Fast path */
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VEC_ST(rgb0, 0, outptr);
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if (num_cols > 16)
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VEC_ST(rgb1, 16, outptr);
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if (num_cols > 32)
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VEC_ST(rgb2, 32, outptr);
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#if RGB_PIXELSIZE == 4
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if (num_cols > 48)
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VEC_ST(rgb3, 48, outptr);
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#endif
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}
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#if __BIG_ENDIAN__
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}
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#endif
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}
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}
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}
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