123f7258a8
The IJG convention is to format copyright notices as: Copyright (C) YYYY, Owner. We try to maintain this convention for any code that is part of the libjpeg API library (with the exception of preserving the copyright notices from Cendio's code verbatim, since those predate libjpeg-turbo.) Note that the phrase "All Rights Reserved" is no longer necessary, since all Buenos Aires Convention signatories signed onto the Berne Convention in 2000. However, our convention is to retain this phrase for any files that have a self-contained copyright header but to leave it off of any files that refer to another file for conditions of distribution and use. For instance, all of the non-SIMD files in the libjpeg API library refer to README.ijg, and the copyright message in that file contains "All Rights Reserved", so it is unnecessary to add it to the individual files. The TurboJPEG code retains my preferred formatting convention for copyright notices, which is based on that of VirtualGL (where the TurboJPEG API originated.)
324 lines
12 KiB
C
324 lines
12 KiB
C
/*
|
|
* 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 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;
|
|
#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, 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) },
|
|
#if __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
|
|
|
|
#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
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
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;
|
|
}
|