diff options
Diffstat (limited to 'media/libjpeg/simd/jdcolext-altivec.c')
| -rw-r--r-- | media/libjpeg/simd/jdcolext-altivec.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/media/libjpeg/simd/jdcolext-altivec.c b/media/libjpeg/simd/jdcolext-altivec.c new file mode 100644 index 000000000..fb121ce74 --- /dev/null +++ b/media/libjpeg/simd/jdcolext-altivec.c @@ -0,0 +1,274 @@ +/* + * AltiVec optimizations for libjpeg-turbo + * + * Copyright (C) 2015, 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 jdcolor-altivec.c */ + + +void jsimd_ycc_rgb_convert_altivec (JDIMENSION out_width, JSAMPIMAGE input_buf, + JDIMENSION input_row, + JSAMPARRAY output_buf, int num_rows) +{ + JSAMPROW outptr, inptr0, inptr1, inptr2; + int pitch = out_width * RGB_PIXELSIZE, num_cols; +#if __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; +#if __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, yl, yh, cbl, cbh, + crl, crh, rl, rh, gl, gh, bl, bh, g0w, g1w, g2w, g3w; + __vector int g0, g1, g2, g3; + + /* 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) }, +#if __BIG_ENDIAN__ + shift_pack_index = {0,1,4,5,8,9,12,13,16,17,20,21,24,25,28,29}; +#else + shift_pack_index = {2,3,6,7,10,11,14,15,18,19,22,23,26,27,30,31}; +#endif + + while (--num_rows >= 0) { + inptr0 = input_buf[0][input_row]; + inptr1 = input_buf[1][input_row]; + inptr2 = input_buf[2][input_row]; + input_row++; + outptr = *output_buf++; + + for (num_cols = pitch; num_cols > 0; + num_cols -= RGB_PIXELSIZE * 16, outptr += RGB_PIXELSIZE * 16, + inptr0 += 16, inptr1 += 16, inptr2 += 16) { + + y = vec_ld(0, inptr0); + /* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't + * support unsigned vectors. + */ + yl = (__vector signed short)VEC_UNPACKHU(y); + yh = (__vector signed short)VEC_UNPACKLU(y); + + cb = vec_ld(0, inptr1); + 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 + */ + bl = vec_add(cbl, cbl); + bh = vec_add(cbh, cbh); + bl = vec_madds(bl, pw_mf0228, pw_one); + bh = vec_madds(bh, pw_mf0228, pw_one); + bl = vec_sra(bl, (__vector unsigned short)pw_one); + bh = vec_sra(bh, (__vector unsigned short)pw_one); + bl = vec_add(bl, cbl); + bh = vec_add(bh, cbh); + bl = vec_add(bl, cbl); + bh = vec_add(bh, cbh); + bl = vec_add(bl, yl); + bh = vec_add(bh, yh); + + rl = vec_add(crl, crl); + rh = vec_add(crh, crh); + rl = vec_madds(rl, pw_f0402, pw_one); + rh = vec_madds(rh, pw_f0402, pw_one); + rl = vec_sra(rl, (__vector unsigned short)pw_one); + rh = vec_sra(rh, (__vector unsigned short)pw_one); + rl = vec_add(rl, crl); + rh = vec_add(rh, crh); + rl = vec_add(rl, yl); + rh = vec_add(rh, yh); + + g0w = vec_mergeh(cbl, crl); + g1w = vec_mergel(cbl, crl); + g0 = vec_msums(g0w, pw_mf0344_f0285, pd_onehalf); + g1 = vec_msums(g1w, pw_mf0344_f0285, pd_onehalf); + g2w = vec_mergeh(cbh, crh); + g3w = vec_mergel(cbh, crh); + g2 = vec_msums(g2w, pw_mf0344_f0285, pd_onehalf); + g3 = vec_msums(g3w, 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. + */ + gl = vec_perm((__vector short)g0, (__vector short)g1, shift_pack_index); + gh = vec_perm((__vector short)g2, (__vector short)g3, shift_pack_index); + gl = vec_sub(gl, crl); + gh = vec_sub(gh, crh); + gl = vec_add(gl, yl); + gh = vec_add(gh, yh); + + 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 + +#if __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 + } +#if __BIG_ENDIAN__ + } +#endif + } + } +} |