1 ;******************************************************************************
2 ;* x86-optimized horizontal line scaling functions
3 ;* Copyright (c) 2011 Ronald S. Bultje <rsbultje@gmail.com>
5 ;* This file is part of Libav.
7 ;* Libav is free software; you can redistribute it and/or
8 ;* modify it under the terms of the GNU Lesser General Public
9 ;* License as published by the Free Software Foundation; either
10 ;* version 2.1 of the License, or (at your option) any later version.
12 ;* Libav is distributed in the hope that it will be useful,
13 ;* but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 ;* Lesser General Public License for more details.
17 ;* You should have received a copy of the GNU Lesser General Public
18 ;* License along with Libav; if not, write to the Free Software
19 ;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 ;******************************************************************************
23 %include "x86util.asm"
27 max_19bit_int: times 4 dd 0x7ffff
28 max_19bit_flt: times 4 dd 524287.0
29 minshort: times 8 dw 0x8000
30 unicoeff: times 4 dd 0x20000000
34 ;-----------------------------------------------------------------------------
35 ; horizontal line scaling
37 ; void hscale<source_width>to<intermediate_nbits>_<filterSize>_<opt>
38 ; (SwsContext *c, int{16,32}_t *dst,
39 ; int dstW, const uint{8,16}_t *src,
40 ; const int16_t *filter,
41 ; const int16_t *filterPos, int filterSize);
43 ; Scale one horizontal line. Input is either 8-bits width or 16-bits width
44 ; ($source_width can be either 8, 9, 10 or 16, difference is whether we have to
45 ; downscale before multiplying). Filter is 14-bits. Output is either 15bits
46 ; (in int16_t) or 19bits (in int32_t), as given in $intermediate_nbits. Each
47 ; output pixel is generated from $filterSize input pixels, the position of
48 ; the first pixel is given in filterPos[nOutputPixel].
49 ;-----------------------------------------------------------------------------
51 ; SCALE_FUNC source_width, intermediate_nbits, filtersize, filtersuffix, opt, n_args, n_xmm
53 cglobal hscale%1to%2_%4_%5, %6, 7, %7
59 mova m2, [max_19bit_int]
61 mova m2, [max_19bit_int]
63 mova m2, [max_19bit_flt]
64 %endif ; mmx/sse2/ssse3/sse4
87 shl r2, 1 ; this allows *16 (i.e. now *8) in lea instructions for the 8-tap filter
94 lea r1, [r1+r2*(2>>r2shr)]
96 lea r1, [r1+r2*(4>>r2shr)]
98 lea r5, [r5+r2*(2>>r2shr)]
102 %if %3 == 4 ; filterSize == 4 scaling
103 ; load 2x4 or 4x4 source pixels into m0/m1
104 movsx r0, word [r5+r2*2+0] ; filterPos[0]
105 movsx r6, word [r5+r2*2+2] ; filterPos[1]
106 movlh m0, [r3+r0*srcmul] ; src[filterPos[0] + {0,1,2,3}]
108 movlh m1, [r3+r6*srcmul] ; src[filterPos[1] + {0,1,2,3}]
111 movhps m0, [r3+r6*srcmul] ; src[filterPos[1] + {0,1,2,3}]
113 movd m4, [r3+r6*srcmul] ; src[filterPos[1] + {0,1,2,3}]
115 movsx r0, word [r5+r2*2+4] ; filterPos[2]
116 movsx r6, word [r5+r2*2+6] ; filterPos[3]
117 movlh m1, [r3+r0*srcmul] ; src[filterPos[2] + {0,1,2,3}]
119 movhps m1, [r3+r6*srcmul] ; src[filterPos[3] + {0,1,2,3}]
121 movd m5, [r3+r6*srcmul] ; src[filterPos[3] + {0,1,2,3}]
124 %endif ; %1 == 8 && %5 <= ssse
125 %endif ; mmsize == 8/16
127 punpcklbw m0, m3 ; byte -> word
128 punpcklbw m1, m3 ; byte -> word
131 ; multiply with filter coefficients
132 %if %1 == 16 ; pmaddwd needs signed adds, so this moves unsigned -> signed, we'll
133 ; add back 0x8000 * sum(coeffs) after the horizontal add
137 pmaddwd m0, [r4+r2*8+mmsize*0] ; *= filter[{0,1,..,6,7}]
138 pmaddwd m1, [r4+r2*8+mmsize*1] ; *= filter[{8,9,..,14,15}]
140 ; add up horizontally (4 srcpix * 4 coefficients -> 1 dstpix)
141 %if mmsize == 8 ; mmx
148 shufps m0, m1, 10001000b
149 shufps m4, m1, 11011101b
152 phaddd m0, m1 ; filter[{ 0, 1, 2, 3}]*src[filterPos[0]+{0,1,2,3}],
153 ; filter[{ 4, 5, 6, 7}]*src[filterPos[1]+{0,1,2,3}],
154 ; filter[{ 8, 9,10,11}]*src[filterPos[2]+{0,1,2,3}],
155 ; filter[{12,13,14,15}]*src[filterPos[3]+{0,1,2,3}]
156 %endif ; mmx/sse2/ssse3/sse4
157 %else ; %3 == 8, i.e. filterSize == 8 scaling
158 ; load 2x8 or 4x8 source pixels into m0, m1, m4 and m5
159 movsx r0, word [r5+r2*1+0] ; filterPos[0]
160 movsx r6, word [r5+r2*1+2] ; filterPos[1]
161 movbh m0, [r3+ r0 *srcmul] ; src[filterPos[0] + {0,1,2,3,4,5,6,7}]
163 movbh m1, [r3+(r0+4)*srcmul] ; src[filterPos[0] + {4,5,6,7}]
164 movbh m4, [r3+ r6 *srcmul] ; src[filterPos[1] + {0,1,2,3}]
165 movbh m5, [r3+(r6+4)*srcmul] ; src[filterPos[1] + {4,5,6,7}]
167 movbh m1, [r3+ r6 *srcmul] ; src[filterPos[1] + {0,1,2,3,4,5,6,7}]
168 movsx r0, word [r5+r2*1+4] ; filterPos[2]
169 movsx r6, word [r5+r2*1+6] ; filterPos[3]
170 movbh m4, [r3+ r0 *srcmul] ; src[filterPos[2] + {0,1,2,3,4,5,6,7}]
171 movbh m5, [r3+ r6 *srcmul] ; src[filterPos[3] + {0,1,2,3,4,5,6,7}]
172 %endif ; mmsize == 8/16
174 punpcklbw m0, m3 ; byte -> word
175 punpcklbw m1, m3 ; byte -> word
176 punpcklbw m4, m3 ; byte -> word
177 punpcklbw m5, m3 ; byte -> word
181 %if %1 == 16 ; pmaddwd needs signed adds, so this moves unsigned -> signed, we'll
182 ; add back 0x8000 * sum(coeffs) after the horizontal add
188 pmaddwd m0, [r4+r2*8+mmsize*0] ; *= filter[{0,1,..,6,7}]
189 pmaddwd m1, [r4+r2*8+mmsize*1] ; *= filter[{8,9,..,14,15}]
190 pmaddwd m4, [r4+r2*8+mmsize*2] ; *= filter[{16,17,..,22,23}]
191 pmaddwd m5, [r4+r2*8+mmsize*3] ; *= filter[{24,25,..,30,31}]
193 ; add up horizontally (8 srcpix * 8 coefficients -> 1 dstpix)
207 ; emulate horizontal add as transpose + vertical add
221 ; FIXME if we rearrange the filter in pairs of 4, we can
222 ; load pixels likewise and use 2 x paddd + phaddd instead
223 ; of 3 x phaddd here, faster on older cpus
226 phaddd m0, m4 ; filter[{ 0, 1,..., 6, 7}]*src[filterPos[0]+{0,1,...,6,7}],
227 ; filter[{ 8, 9,...,14,15}]*src[filterPos[1]+{0,1,...,6,7}],
228 ; filter[{16,17,...,22,23}]*src[filterPos[2]+{0,1,...,6,7}],
229 ; filter[{24,25,...,30,31}]*src[filterPos[3]+{0,1,...,6,7}]
230 %endif ; mmx/sse2/ssse3/sse4
233 %else ; %3 == X, i.e. any filterSize scaling
237 %else ; %4 == X || %4 == X8
242 movsxd r6, r6d ; filterSize
243 lea r12, [r3+(r6-r6sub)*srcmul] ; &src[filterSize&~4]
248 lea r0, [r3+(r6-r6sub)*srcmul] ; &src[filterSize&~4]
264 movsx r0, word [r5+r2*2+0] ; filterPos[0]
265 movsx r1x, word [r5+r2*2+2] ; filterPos[1]
266 ; FIXME maybe do 4px/iteration on x86-64 (x86-32 wouldn't have enough regs)?
272 ; load 2x4 (mmx) or 2x8 (sse) source pixels into m0/m1 -> m4/m5
273 movbh m0, [src_reg+r0 *srcmul] ; src[filterPos[0] + {0,1,2,3(,4,5,6,7)}]
274 movbh m1, [src_reg+(r1x+r6sub)*srcmul] ; src[filterPos[1] + {0,1,2,3(,4,5,6,7)}]
281 %if %1 == 16 ; pmaddwd needs signed adds, so this moves unsigned -> signed, we'll
282 ; add back 0x8000 * sum(coeffs) after the horizontal add
286 pmaddwd m0, [r4 ] ; filter[{0,1,2,3(,4,5,6,7)}]
287 pmaddwd m1, [r4+(r6+r6sub)*2] ; filter[filtersize+{0,1,2,3(,4,5,6,7)}]
291 add src_reg, srcmul*mmsize/2
292 cmp src_reg, filter2 ; while (src += 4) < &src[filterSize]
296 movsx r1x, word [r5+r2*2+2] ; filterPos[1]
297 movlh m0, [src_reg+r0 *srcmul] ; split last 4 srcpx of dstpx[0]
298 sub r1x, r6 ; and first 4 srcpx of dstpx[1]
300 movhps m0, [src_reg+(r1x+r6sub)*srcmul]
302 movd m1, [src_reg+(r1x+r6sub)*srcmul]
304 %endif ; %1 == 8 && %5 <= ssse
308 %if %1 == 16 ; pmaddwd needs signed adds, so this moves unsigned -> signed, we'll
309 ; add back 0x8000 * sum(coeffs) after the horizontal add
315 lea r4, [r4+(r6+r6sub)*2]
317 %if mmsize == 8 ; mmx
330 %endif ; sse2/ssse3/sse4
335 pshufd m4, m4, 11011000b
341 %endif ; sse2/ssse3/sse4
342 %endif ; mmsize == 8/16
345 %if %1 == 16 ; add 0x8000 * sum(coeffs), i.e. back from signed -> unsigned
350 psrad m0, 14 + %1 - %2
357 movh [r1+r2*(2>>r2shr)], m0
363 PMINSD_MMX m0, m2, m4
370 %endif ; mmx/sse2/ssse3/sse4
372 mova [r1+r2*(4>>r2shr)], m0
378 add r2, (mmsize<<r2shr)/4 ; both 8tap and 4tap really only do 4 pixels (or for mmx: 2 pixels)
379 ; per iteration. see "shl r2,1" above as for why we do this
396 ; SCALE_FUNCS source_width, intermediate_nbits, opt, n_xmm
398 SCALE_FUNC %1, %2, 4, 4, %3, 6, %4
399 SCALE_FUNC %1, %2, 8, 8, %3, 6, %4
401 SCALE_FUNC %1, %2, X, X, %3, 7, %4
403 SCALE_FUNC %1, %2, X, X4, %3, 7, %4
404 SCALE_FUNC %1, %2, X, X8, %3, 7, %4
408 ; SCALE_FUNCS2 opt, 8_xmm_args, 9to10_xmm_args, 16_xmm_args
409 %macro SCALE_FUNCS2 4
411 SCALE_FUNCS 8, 15, %1, %2
412 SCALE_FUNCS 9, 15, %1, %3
413 SCALE_FUNCS 10, 15, %1, %3
414 SCALE_FUNCS 14, 15, %1, %3
415 SCALE_FUNCS 16, 15, %1, %4
417 SCALE_FUNCS 8, 19, %1, %2
418 SCALE_FUNCS 9, 19, %1, %3
419 SCALE_FUNCS 10, 19, %1, %3
420 SCALE_FUNCS 14, 19, %1, %3
421 SCALE_FUNCS 16, 19, %1, %4
426 SCALE_FUNCS2 mmx, 0, 0, 0
429 SCALE_FUNCS2 sse2, 6, 7, 8
430 SCALE_FUNCS2 ssse3, 6, 6, 8
431 SCALE_FUNCS2 sse4, 6, 6, 8