FFmpeg  4.0
hscale_fast_bilinear_simd.c
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1 /*
2  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "../swscale_internal.h"
22 #include "libavutil/x86/asm.h"
23 #include "libavutil/x86/cpu.h"
24 
25 #define RET 0xC3 // near return opcode for x86
26 #define PREFETCH "prefetchnta"
27 
28 #if HAVE_INLINE_ASM
29 av_cold int ff_init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
30  int16_t *filter, int32_t *filterPos,
31  int numSplits)
32 {
33  uint8_t *fragmentA;
34  x86_reg imm8OfPShufW1A;
35  x86_reg imm8OfPShufW2A;
36  x86_reg fragmentLengthA;
37  uint8_t *fragmentB;
38  x86_reg imm8OfPShufW1B;
39  x86_reg imm8OfPShufW2B;
40  x86_reg fragmentLengthB;
41  int fragmentPos;
42 
43  int xpos, i;
44 
45  // create an optimized horizontal scaling routine
46  /* This scaler is made of runtime-generated MMXEXT code using specially tuned
47  * pshufw instructions. For every four output pixels, if four input pixels
48  * are enough for the fast bilinear scaling, then a chunk of fragmentB is
49  * used. If five input pixels are needed, then a chunk of fragmentA is used.
50  */
51 
52  // code fragment
53 
54  __asm__ volatile (
55  "jmp 9f \n\t"
56  // Begin
57  "0: \n\t"
58  "movq (%%"FF_REG_d", %%"FF_REG_a"), %%mm3 \n\t"
59  "movd (%%"FF_REG_c", %%"FF_REG_S"), %%mm0 \n\t"
60  "movd 1(%%"FF_REG_c", %%"FF_REG_S"), %%mm1 \n\t"
61  "punpcklbw %%mm7, %%mm1 \n\t"
62  "punpcklbw %%mm7, %%mm0 \n\t"
63  "pshufw $0xFF, %%mm1, %%mm1 \n\t"
64  "1: \n\t"
65  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
66  "2: \n\t"
67  "psubw %%mm1, %%mm0 \n\t"
68  "movl 8(%%"FF_REG_b", %%"FF_REG_a"), %%esi \n\t"
69  "pmullw %%mm3, %%mm0 \n\t"
70  "psllw $7, %%mm1 \n\t"
71  "paddw %%mm1, %%mm0 \n\t"
72 
73  "movq %%mm0, (%%"FF_REG_D", %%"FF_REG_a") \n\t"
74 
75  "add $8, %%"FF_REG_a" \n\t"
76  // End
77  "9: \n\t"
78  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
79  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
80  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
81  "dec %1 \n\t"
82  "dec %2 \n\t"
83  "sub %0, %1 \n\t"
84  "sub %0, %2 \n\t"
85  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
86  "sub %0, %3 \n\t"
87 
88 
89  : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
90  "=r" (fragmentLengthA)
91  );
92 
93  __asm__ volatile (
94  "jmp 9f \n\t"
95  // Begin
96  "0: \n\t"
97  "movq (%%"FF_REG_d", %%"FF_REG_a"), %%mm3 \n\t"
98  "movd (%%"FF_REG_c", %%"FF_REG_S"), %%mm0 \n\t"
99  "punpcklbw %%mm7, %%mm0 \n\t"
100  "pshufw $0xFF, %%mm0, %%mm1 \n\t"
101  "1: \n\t"
102  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
103  "2: \n\t"
104  "psubw %%mm1, %%mm0 \n\t"
105  "movl 8(%%"FF_REG_b", %%"FF_REG_a"), %%esi \n\t"
106  "pmullw %%mm3, %%mm0 \n\t"
107  "psllw $7, %%mm1 \n\t"
108  "paddw %%mm1, %%mm0 \n\t"
109 
110  "movq %%mm0, (%%"FF_REG_D", %%"FF_REG_a") \n\t"
111 
112  "add $8, %%"FF_REG_a" \n\t"
113  // End
114  "9: \n\t"
115  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
116  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
117  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
118  "dec %1 \n\t"
119  "dec %2 \n\t"
120  "sub %0, %1 \n\t"
121  "sub %0, %2 \n\t"
122  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
123  "sub %0, %3 \n\t"
124 
125 
126  : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
127  "=r" (fragmentLengthB)
128  );
129 
130  xpos = 0; // lumXInc/2 - 0x8000; // difference between pixel centers
131  fragmentPos = 0;
132 
133  for (i = 0; i < dstW / numSplits; i++) {
134  int xx = xpos >> 16;
135 
136  if ((i & 3) == 0) {
137  int a = 0;
138  int b = ((xpos + xInc) >> 16) - xx;
139  int c = ((xpos + xInc * 2) >> 16) - xx;
140  int d = ((xpos + xInc * 3) >> 16) - xx;
141  int inc = (d + 1 < 4);
142  uint8_t *fragment = inc ? fragmentB : fragmentA;
143  x86_reg imm8OfPShufW1 = inc ? imm8OfPShufW1B : imm8OfPShufW1A;
144  x86_reg imm8OfPShufW2 = inc ? imm8OfPShufW2B : imm8OfPShufW2A;
145  x86_reg fragmentLength = inc ? fragmentLengthB : fragmentLengthA;
146  int maxShift = 3 - (d + inc);
147  int shift = 0;
148 
149  if (filterCode) {
150  filter[i] = ((xpos & 0xFFFF) ^ 0xFFFF) >> 9;
151  filter[i + 1] = (((xpos + xInc) & 0xFFFF) ^ 0xFFFF) >> 9;
152  filter[i + 2] = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;
153  filter[i + 3] = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;
154  filterPos[i / 2] = xx;
155 
156  memcpy(filterCode + fragmentPos, fragment, fragmentLength);
157 
158  filterCode[fragmentPos + imm8OfPShufW1] = (a + inc) |
159  ((b + inc) << 2) |
160  ((c + inc) << 4) |
161  ((d + inc) << 6);
162  filterCode[fragmentPos + imm8OfPShufW2] = a | (b << 2) |
163  (c << 4) |
164  (d << 6);
165 
166  if (i + 4 - inc >= dstW)
167  shift = maxShift; // avoid overread
168  else if ((filterPos[i / 2] & 3) <= maxShift)
169  shift = filterPos[i / 2] & 3; // align
170 
171  if (shift && i >= shift) {
172  filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;
173  filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;
174  filterPos[i / 2] -= shift;
175  }
176  }
177 
178  fragmentPos += fragmentLength;
179 
180  if (filterCode)
181  filterCode[fragmentPos] = RET;
182  }
183  xpos += xInc;
184  }
185  if (filterCode)
186  filterPos[((i / 2) + 1) & (~1)] = xpos >> 16; // needed to jump to the next part
187 
188  return fragmentPos + 1;
189 }
190 
191 void ff_hyscale_fast_mmxext(SwsContext *c, int16_t *dst,
192  int dstWidth, const uint8_t *src,
193  int srcW, int xInc)
194 {
195  int32_t *filterPos = c->hLumFilterPos;
196  int16_t *filter = c->hLumFilter;
197  void *mmxextFilterCode = c->lumMmxextFilterCode;
198  int i;
199 #if ARCH_X86_64
200  uint64_t retsave;
201 #else
202 #if !HAVE_EBX_AVAILABLE
203  uint64_t ebxsave;
204 #endif
205 #endif
206 
207  __asm__ volatile(
208 #if ARCH_X86_64
209  "mov -8(%%rsp), %%"FF_REG_a" \n\t"
210  "mov %%"FF_REG_a", %5 \n\t" // retsave
211 #else
212 #if !HAVE_EBX_AVAILABLE
213  "mov %%"FF_REG_b", %5 \n\t" // ebxsave
214 #endif
215 #endif
216  "pxor %%mm7, %%mm7 \n\t"
217  "mov %0, %%"FF_REG_c" \n\t"
218  "mov %1, %%"FF_REG_D" \n\t"
219  "mov %2, %%"FF_REG_d" \n\t"
220  "mov %3, %%"FF_REG_b" \n\t"
221  "xor %%"FF_REG_a", %%"FF_REG_a" \n\t" // i
222  PREFETCH" (%%"FF_REG_c") \n\t"
223  PREFETCH" 32(%%"FF_REG_c") \n\t"
224  PREFETCH" 64(%%"FF_REG_c") \n\t"
225 
226 #if ARCH_X86_64
227 #define CALL_MMXEXT_FILTER_CODE \
228  "movl (%%"FF_REG_b"), %%esi \n\t"\
229  "call *%4 \n\t"\
230  "movl (%%"FF_REG_b", %%"FF_REG_a"), %%esi \n\t"\
231  "add %%"FF_REG_S", %%"FF_REG_c" \n\t"\
232  "add %%"FF_REG_a", %%"FF_REG_D" \n\t"\
233  "xor %%"FF_REG_a", %%"FF_REG_a" \n\t"\
234 
235 #else
236 #define CALL_MMXEXT_FILTER_CODE \
237  "movl (%%"FF_REG_b"), %%esi \n\t"\
238  "call *%4 \n\t"\
239  "addl (%%"FF_REG_b", %%"FF_REG_a"), %%"FF_REG_c" \n\t"\
240  "add %%"FF_REG_a", %%"FF_REG_D" \n\t"\
241  "xor %%"FF_REG_a", %%"FF_REG_a" \n\t"\
242 
243 #endif /* ARCH_X86_64 */
244 
245  CALL_MMXEXT_FILTER_CODE
246  CALL_MMXEXT_FILTER_CODE
247  CALL_MMXEXT_FILTER_CODE
248  CALL_MMXEXT_FILTER_CODE
249  CALL_MMXEXT_FILTER_CODE
250  CALL_MMXEXT_FILTER_CODE
251  CALL_MMXEXT_FILTER_CODE
252  CALL_MMXEXT_FILTER_CODE
253 
254 #if ARCH_X86_64
255  "mov %5, %%"FF_REG_a" \n\t"
256  "mov %%"FF_REG_a", -8(%%rsp) \n\t"
257 #else
258 #if !HAVE_EBX_AVAILABLE
259  "mov %5, %%"FF_REG_b" \n\t"
260 #endif
261 #endif
262  :: "m" (src), "m" (dst), "m" (filter), "m" (filterPos),
263  "m" (mmxextFilterCode)
264 #if ARCH_X86_64
265  ,"m"(retsave)
266 #else
267 #if !HAVE_EBX_AVAILABLE
268  ,"m" (ebxsave)
269 #endif
270 #endif
271  : "%"FF_REG_a, "%"FF_REG_c, "%"FF_REG_d, "%"FF_REG_S, "%"FF_REG_D
272 #if ARCH_X86_64 || HAVE_EBX_AVAILABLE
273  ,"%"FF_REG_b
274 #endif
275  );
276 
277  for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--)
278  dst[i] = src[srcW-1]*128;
279 }
280 
281 void ff_hcscale_fast_mmxext(SwsContext *c, int16_t *dst1, int16_t *dst2,
282  int dstWidth, const uint8_t *src1,
283  const uint8_t *src2, int srcW, int xInc)
284 {
285  int32_t *filterPos = c->hChrFilterPos;
286  int16_t *filter = c->hChrFilter;
287  void *mmxextFilterCode = c->chrMmxextFilterCode;
288  int i;
289 #if ARCH_X86_64
290  DECLARE_ALIGNED(8, uint64_t, retsave);
291 #else
292 #if !HAVE_EBX_AVAILABLE
293  DECLARE_ALIGNED(8, uint64_t, ebxsave);
294 #endif
295 #endif
296  __asm__ volatile(
297 #if ARCH_X86_64
298  "mov -8(%%rsp), %%"FF_REG_a" \n\t"
299  "mov %%"FF_REG_a", %7 \n\t" // retsave
300 #else
301 #if !HAVE_EBX_AVAILABLE
302  "mov %%"FF_REG_b", %7 \n\t" // ebxsave
303 #endif
304 #endif
305  "pxor %%mm7, %%mm7 \n\t"
306  "mov %0, %%"FF_REG_c" \n\t"
307  "mov %1, %%"FF_REG_D" \n\t"
308  "mov %2, %%"FF_REG_d" \n\t"
309  "mov %3, %%"FF_REG_b" \n\t"
310  "xor %%"FF_REG_a", %%"FF_REG_a" \n\t" // i
311  PREFETCH" (%%"FF_REG_c") \n\t"
312  PREFETCH" 32(%%"FF_REG_c") \n\t"
313  PREFETCH" 64(%%"FF_REG_c") \n\t"
314 
315  CALL_MMXEXT_FILTER_CODE
316  CALL_MMXEXT_FILTER_CODE
317  CALL_MMXEXT_FILTER_CODE
318  CALL_MMXEXT_FILTER_CODE
319  "xor %%"FF_REG_a", %%"FF_REG_a" \n\t" // i
320  "mov %5, %%"FF_REG_c" \n\t" // src2
321  "mov %6, %%"FF_REG_D" \n\t" // dst2
322  PREFETCH" (%%"FF_REG_c") \n\t"
323  PREFETCH" 32(%%"FF_REG_c") \n\t"
324  PREFETCH" 64(%%"FF_REG_c") \n\t"
325 
326  CALL_MMXEXT_FILTER_CODE
327  CALL_MMXEXT_FILTER_CODE
328  CALL_MMXEXT_FILTER_CODE
329  CALL_MMXEXT_FILTER_CODE
330 
331 #if ARCH_X86_64
332  "mov %7, %%"FF_REG_a" \n\t"
333  "mov %%"FF_REG_a", -8(%%rsp) \n\t"
334 #else
335 #if !HAVE_EBX_AVAILABLE
336  "mov %7, %%"FF_REG_b" \n\t"
337 #endif
338 #endif
339  :: "m" (src1), "m" (dst1), "m" (filter), "m" (filterPos),
340  "m" (mmxextFilterCode), "m" (src2), "m"(dst2)
341 #if ARCH_X86_64
342  ,"m"(retsave)
343 #else
344 #if !HAVE_EBX_AVAILABLE
345  ,"m" (ebxsave)
346 #endif
347 #endif
348  : "%"FF_REG_a, "%"FF_REG_c, "%"FF_REG_d, "%"FF_REG_S, "%"FF_REG_D
349 #if ARCH_X86_64 || HAVE_EBX_AVAILABLE
350  ,"%"FF_REG_b
351 #endif
352  );
353 
354  for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) {
355  dst1[i] = src1[srcW-1]*128;
356  dst2[i] = src2[srcW-1]*128;
357  }
358 }
359 #endif //HAVE_INLINE_ASM
shift
static int shift(int a, int b)
Definition: sonic.c:82
SwsContext::chrMmxextFilterCode
uint8_t * chrMmxextFilterCode
Runtime-generated MMXEXT horizontal fast bilinear scaler code for chroma planes.
Definition: swscale_internal.h:389
SwsContext::lumMmxextFilterCode
uint8_t * lumMmxextFilterCode
Runtime-generated MMXEXT horizontal fast bilinear scaler code for luma/alpha planes.
Definition: swscale_internal.h:388
ARCH_X86_64
#define ARCH_X86_64
Definition: config.h:40
ff_hcscale_fast_mmxext
void ff_hcscale_fast_mmxext(SwsContext *c, int16_t *dst1, int16_t *dst2, int dstWidth, const uint8_t *src1, const uint8_t *src2, int srcW, int xInc)
b
const char * b
Definition: vf_curves.c:113
src
#define src
Definition: vp8dsp.c:254
ff_hyscale_fast_mmxext
void ff_hyscale_fast_mmxext(SwsContext *c, int16_t *dst, int dstWidth, const uint8_t *src, int srcW, int xInc)
filter
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:114
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:82
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
SwsContext::hChrFilterPos
int32_t * hChrFilterPos
Array of horizontal filter starting positions for each dst[i] for chroma planes.
Definition: swscale_internal.h:377
SwsContext::hLumFilterPos
int32_t * hLumFilterPos
Array of horizontal filter starting positions for each dst[i] for luma/alpha planes.
Definition: swscale_internal.h:376
RET
#define RET
Definition: hscale_fast_bilinear_simd.c:25
int32_t
int32_t
Definition: audio_convert.c:194
src1
#define src1
Definition: h264pred.c:139
ff_init_hscaler_mmxext
int ff_init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode, int16_t *filter, int32_t *filterPos, int numSplits)
SwsContext::hLumFilter
int16_t * hLumFilter
Array of horizontal filter coefficients for luma/alpha planes.
Definition: swscale_internal.h:372
LOCAL_MANGLE
#define LOCAL_MANGLE(a)
Definition: asm.h:109
c
static double c[64]
Definition: vsrc_mptestsrc.c:87
HAVE_EBX_AVAILABLE
#define HAVE_EBX_AVAILABLE
Definition: config.h:337
PREFETCH
#define PREFETCH
Definition: hscale_fast_bilinear_simd.c:26
x86_reg
int x86_reg
Definition: asm.h:72
SwsContext::hChrFilter
int16_t * hChrFilter
Array of horizontal filter coefficients for chroma planes.
Definition: swscale_internal.h:373
a
a
Definition: h264pred_template.c:468
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