font_load_ft.c: fix possible crash with recent Fontconfig
[mplayer.git] / libvo / aclib_template.c
blobdb3015ae6605b1bbb8a6edc86898c7e409397154
1 /*
2 * aclib - advanced C library ;)
3 * functions which improve and expand the standard C library
5 * This file is part of MPlayer.
7 * MPlayer is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * MPlayer 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
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #if !HAVE_SSE2
24 P3 processor has only one SSE decoder so can execute only 1 sse insn per
25 cpu clock, but it has 3 mmx decoders (include load/store unit)
26 and executes 3 mmx insns per cpu clock.
27 P4 processor has some chances, but after reading:
28 http://www.emulators.com/pentium4.htm
29 I have doubts. Anyway SSE2 version of this code can be written better.
31 #undef HAVE_SSE
32 #define HAVE_SSE 0
33 #endif
37 This part of code was taken by me from Linux-2.4.3 and slightly modified
38 for MMX, MMX2, SSE instruction set. I have done it since linux uses page aligned
39 blocks but mplayer uses weakly ordered data and original sources can not
40 speedup them. Only using PREFETCHNTA and MOVNTQ together have effect!
42 >From IA-32 Intel Architecture Software Developer's Manual Volume 1,
44 Order Number 245470:
45 "10.4.6. Cacheability Control, Prefetch, and Memory Ordering Instructions"
47 Data referenced by a program can be temporal (data will be used again) or
48 non-temporal (data will be referenced once and not reused in the immediate
49 future). To make efficient use of the processor's caches, it is generally
50 desirable to cache temporal data and not cache non-temporal data. Overloading
51 the processor's caches with non-temporal data is sometimes referred to as
52 "polluting the caches".
53 The non-temporal data is written to memory with Write-Combining semantics.
55 The PREFETCHh instructions permits a program to load data into the processor
56 at a suggested cache level, so that it is closer to the processors load and
57 store unit when it is needed. If the data is already present in a level of
58 the cache hierarchy that is closer to the processor, the PREFETCHh instruction
59 will not result in any data movement.
60 But we should you PREFETCHNTA: Non-temporal data fetch data into location
61 close to the processor, minimizing cache pollution.
63 The MOVNTQ (store quadword using non-temporal hint) instruction stores
64 packed integer data from an MMX register to memory, using a non-temporal hint.
65 The MOVNTPS (store packed single-precision floating-point values using
66 non-temporal hint) instruction stores packed floating-point data from an
67 XMM register to memory, using a non-temporal hint.
69 The SFENCE (Store Fence) instruction controls write ordering by creating a
70 fence for memory store operations. This instruction guarantees that the results
71 of every store instruction that precedes the store fence in program order is
72 globally visible before any store instruction that follows the fence. The
73 SFENCE instruction provides an efficient way of ensuring ordering between
74 procedures that produce weakly-ordered data and procedures that consume that
75 data.
77 If you have questions please contact with me: Nick Kurshev: nickols_k@mail.ru.
80 // 3dnow memcpy support from kernel 2.4.2
81 // by Pontscho/fresh!mindworkz
84 #undef HAVE_ONLY_MMX1
85 #if HAVE_MMX && !HAVE_MMX2 && !HAVE_AMD3DNOW && !HAVE_SSE
86 /* means: mmx v.1. Note: Since we added alignment of destinition it speedups
87 of memory copying on PentMMX, Celeron-1 and P2 upto 12% versus
88 standard (non MMX-optimized) version.
89 Note: on K6-2+ it speedups memory copying upto 25% and
90 on K7 and P3 about 500% (5 times). */
91 #define HAVE_ONLY_MMX1
92 #endif
95 #undef HAVE_K6_2PLUS
96 #if !HAVE_MMX2 && HAVE_AMD3DNOW
97 #define HAVE_K6_2PLUS
98 #endif
100 /* for small memory blocks (<256 bytes) this version is faster */
101 #define small_memcpy(to,from,n)\
103 register x86_reg dummy;\
104 __asm__ volatile(\
105 "rep; movsb"\
106 :"=&D"(to), "=&S"(from), "=&c"(dummy)\
107 /* It's most portable way to notify compiler */\
108 /* that edi, esi and ecx are clobbered in asm block. */\
109 /* Thanks to A'rpi for hint!!! */\
110 :"0" (to), "1" (from),"2" (n)\
111 : "memory");\
114 #undef MMREG_SIZE
115 #if HAVE_SSE
116 #define MMREG_SIZE 16
117 #else
118 #define MMREG_SIZE 64 //8
119 #endif
121 #undef PREFETCH
122 #undef EMMS
124 #if HAVE_MMX2
125 #define PREFETCH "prefetchnta"
126 #elif HAVE_AMD3DNOW
127 #define PREFETCH "prefetch"
128 #else
129 #define PREFETCH " # nop"
130 #endif
132 /* On K6 femms is faster of emms. On K7 femms is directly mapped on emms. */
133 #if HAVE_AMD3DNOW
134 #define EMMS "femms"
135 #else
136 #define EMMS "emms"
137 #endif
139 #undef MOVNTQ
140 #if HAVE_MMX2
141 #define MOVNTQ "movntq"
142 #else
143 #define MOVNTQ "movq"
144 #endif
146 #undef MIN_LEN
147 #ifdef HAVE_ONLY_MMX1
148 #define MIN_LEN 0x800 /* 2K blocks */
149 #else
150 #define MIN_LEN 0x40 /* 64-byte blocks */
151 #endif
153 static void * RENAME(fast_memcpy)(void * to, const void * from, size_t len)
155 void *retval;
156 size_t i;
157 retval = to;
158 #ifdef STATISTICS
160 static int freq[33];
161 static int t=0;
162 int i;
163 for(i=0; len>(1<<i); i++);
164 freq[i]++;
165 t++;
166 if(1024*1024*1024 % t == 0)
167 for(i=0; i<32; i++)
168 printf("freq < %8d %4d\n", 1<<i, freq[i]);
170 #endif
171 #ifndef HAVE_ONLY_MMX1
172 /* PREFETCH has effect even for MOVSB instruction ;) */
173 __asm__ volatile (
174 PREFETCH" (%0)\n"
175 PREFETCH" 64(%0)\n"
176 PREFETCH" 128(%0)\n"
177 PREFETCH" 192(%0)\n"
178 PREFETCH" 256(%0)\n"
179 : : "r" (from) );
180 #endif
181 if(len >= MIN_LEN)
183 register x86_reg delta;
184 /* Align destinition to MMREG_SIZE -boundary */
185 delta = ((intptr_t)to)&(MMREG_SIZE-1);
186 if(delta)
188 delta=MMREG_SIZE-delta;
189 len -= delta;
190 small_memcpy(to, from, delta);
192 i = len >> 6; /* len/64 */
193 len&=63;
195 This algorithm is top effective when the code consequently
196 reads and writes blocks which have size of cache line.
197 Size of cache line is processor-dependent.
198 It will, however, be a minimum of 32 bytes on any processors.
199 It would be better to have a number of instructions which
200 perform reading and writing to be multiple to a number of
201 processor's decoders, but it's not always possible.
203 #if HAVE_SSE /* Only P3 (may be Cyrix3) */
204 if(((intptr_t)from) & 15)
205 /* if SRC is misaligned */
206 for(; i>0; i--)
208 __asm__ volatile (
209 PREFETCH" 320(%0)\n"
210 "movups (%0), %%xmm0\n"
211 "movups 16(%0), %%xmm1\n"
212 "movups 32(%0), %%xmm2\n"
213 "movups 48(%0), %%xmm3\n"
214 "movntps %%xmm0, (%1)\n"
215 "movntps %%xmm1, 16(%1)\n"
216 "movntps %%xmm2, 32(%1)\n"
217 "movntps %%xmm3, 48(%1)\n"
218 :: "r" (from), "r" (to) : "memory");
219 from=((const unsigned char *) from)+64;
220 to=((unsigned char *)to)+64;
222 else
224 Only if SRC is aligned on 16-byte boundary.
225 It allows to use movaps instead of movups, which required data
226 to be aligned or a general-protection exception (#GP) is generated.
228 for(; i>0; i--)
230 __asm__ volatile (
231 PREFETCH" 320(%0)\n"
232 "movaps (%0), %%xmm0\n"
233 "movaps 16(%0), %%xmm1\n"
234 "movaps 32(%0), %%xmm2\n"
235 "movaps 48(%0), %%xmm3\n"
236 "movntps %%xmm0, (%1)\n"
237 "movntps %%xmm1, 16(%1)\n"
238 "movntps %%xmm2, 32(%1)\n"
239 "movntps %%xmm3, 48(%1)\n"
240 :: "r" (from), "r" (to) : "memory");
241 from=((const unsigned char *)from)+64;
242 to=((unsigned char *)to)+64;
244 #else
245 // Align destination at BLOCK_SIZE boundary
246 for(; ((intptr_t)to & (BLOCK_SIZE-1)) && i>0; i--)
248 __asm__ volatile (
249 #ifndef HAVE_ONLY_MMX1
250 PREFETCH" 320(%0)\n"
251 #endif
252 "movq (%0), %%mm0\n"
253 "movq 8(%0), %%mm1\n"
254 "movq 16(%0), %%mm2\n"
255 "movq 24(%0), %%mm3\n"
256 "movq 32(%0), %%mm4\n"
257 "movq 40(%0), %%mm5\n"
258 "movq 48(%0), %%mm6\n"
259 "movq 56(%0), %%mm7\n"
260 MOVNTQ" %%mm0, (%1)\n"
261 MOVNTQ" %%mm1, 8(%1)\n"
262 MOVNTQ" %%mm2, 16(%1)\n"
263 MOVNTQ" %%mm3, 24(%1)\n"
264 MOVNTQ" %%mm4, 32(%1)\n"
265 MOVNTQ" %%mm5, 40(%1)\n"
266 MOVNTQ" %%mm6, 48(%1)\n"
267 MOVNTQ" %%mm7, 56(%1)\n"
268 :: "r" (from), "r" (to) : "memory");
269 from=((const unsigned char *)from)+64;
270 to=((unsigned char *)to)+64;
273 // printf(" %d %d\n", (int)from&1023, (int)to&1023);
274 // Pure Assembly cuz gcc is a bit unpredictable ;)
275 if(i>=BLOCK_SIZE/64)
276 __asm__ volatile(
277 "xor %%"REG_a", %%"REG_a" \n\t"
278 ASMALIGN(4)
279 "1: \n\t"
280 "movl (%0, %%"REG_a"), %%ecx \n\t"
281 "movl 32(%0, %%"REG_a"), %%ecx \n\t"
282 "movl 64(%0, %%"REG_a"), %%ecx \n\t"
283 "movl 96(%0, %%"REG_a"), %%ecx \n\t"
284 "add $128, %%"REG_a" \n\t"
285 "cmp %3, %%"REG_a" \n\t"
286 " jb 1b \n\t"
288 "xor %%"REG_a", %%"REG_a" \n\t"
290 ASMALIGN(4)
291 "2: \n\t"
292 "movq (%0, %%"REG_a"), %%mm0\n"
293 "movq 8(%0, %%"REG_a"), %%mm1\n"
294 "movq 16(%0, %%"REG_a"), %%mm2\n"
295 "movq 24(%0, %%"REG_a"), %%mm3\n"
296 "movq 32(%0, %%"REG_a"), %%mm4\n"
297 "movq 40(%0, %%"REG_a"), %%mm5\n"
298 "movq 48(%0, %%"REG_a"), %%mm6\n"
299 "movq 56(%0, %%"REG_a"), %%mm7\n"
300 MOVNTQ" %%mm0, (%1, %%"REG_a")\n"
301 MOVNTQ" %%mm1, 8(%1, %%"REG_a")\n"
302 MOVNTQ" %%mm2, 16(%1, %%"REG_a")\n"
303 MOVNTQ" %%mm3, 24(%1, %%"REG_a")\n"
304 MOVNTQ" %%mm4, 32(%1, %%"REG_a")\n"
305 MOVNTQ" %%mm5, 40(%1, %%"REG_a")\n"
306 MOVNTQ" %%mm6, 48(%1, %%"REG_a")\n"
307 MOVNTQ" %%mm7, 56(%1, %%"REG_a")\n"
308 "add $64, %%"REG_a" \n\t"
309 "cmp %3, %%"REG_a" \n\t"
310 "jb 2b \n\t"
312 #if CONFUSION_FACTOR > 0
313 // a few percent speedup on out of order executing CPUs
314 "mov %5, %%"REG_a" \n\t"
315 "2: \n\t"
316 "movl (%0), %%ecx \n\t"
317 "movl (%0), %%ecx \n\t"
318 "movl (%0), %%ecx \n\t"
319 "movl (%0), %%ecx \n\t"
320 "dec %%"REG_a" \n\t"
321 " jnz 2b \n\t"
322 #endif
324 "xor %%"REG_a", %%"REG_a" \n\t"
325 "add %3, %0 \n\t"
326 "add %3, %1 \n\t"
327 "sub %4, %2 \n\t"
328 "cmp %4, %2 \n\t"
329 " jae 1b \n\t"
330 : "+r" (from), "+r" (to), "+r" (i)
331 : "r" ((x86_reg)BLOCK_SIZE), "i" (BLOCK_SIZE/64), "i" ((x86_reg)CONFUSION_FACTOR)
332 : "%"REG_a, "%ecx"
335 for(; i>0; i--)
337 __asm__ volatile (
338 #ifndef HAVE_ONLY_MMX1
339 PREFETCH" 320(%0)\n"
340 #endif
341 "movq (%0), %%mm0\n"
342 "movq 8(%0), %%mm1\n"
343 "movq 16(%0), %%mm2\n"
344 "movq 24(%0), %%mm3\n"
345 "movq 32(%0), %%mm4\n"
346 "movq 40(%0), %%mm5\n"
347 "movq 48(%0), %%mm6\n"
348 "movq 56(%0), %%mm7\n"
349 MOVNTQ" %%mm0, (%1)\n"
350 MOVNTQ" %%mm1, 8(%1)\n"
351 MOVNTQ" %%mm2, 16(%1)\n"
352 MOVNTQ" %%mm3, 24(%1)\n"
353 MOVNTQ" %%mm4, 32(%1)\n"
354 MOVNTQ" %%mm5, 40(%1)\n"
355 MOVNTQ" %%mm6, 48(%1)\n"
356 MOVNTQ" %%mm7, 56(%1)\n"
357 :: "r" (from), "r" (to) : "memory");
358 from=((const unsigned char *)from)+64;
359 to=((unsigned char *)to)+64;
362 #endif /* Have SSE */
363 #if HAVE_MMX2
364 /* since movntq is weakly-ordered, a "sfence"
365 * is needed to become ordered again. */
366 __asm__ volatile ("sfence":::"memory");
367 #endif
368 #if !HAVE_SSE
369 /* enables to use FPU */
370 __asm__ volatile (EMMS:::"memory");
371 #endif
374 * Now do the tail of the block
376 if(len) small_memcpy(to, from, len);
377 return retval;
381 * special copy routine for mem -> agp/pci copy (based upon fast_memcpy)
383 static void * RENAME(mem2agpcpy)(void * to, const void * from, size_t len)
385 void *retval;
386 size_t i;
387 retval = to;
388 #ifdef STATISTICS
390 static int freq[33];
391 static int t=0;
392 int i;
393 for(i=0; len>(1<<i); i++);
394 freq[i]++;
395 t++;
396 if(1024*1024*1024 % t == 0)
397 for(i=0; i<32; i++)
398 printf("mem2agp freq < %8d %4d\n", 1<<i, freq[i]);
400 #endif
401 if(len >= MIN_LEN)
403 register x86_reg delta;
404 /* Align destinition to MMREG_SIZE -boundary */
405 delta = ((intptr_t)to)&7;
406 if(delta)
408 delta=8-delta;
409 len -= delta;
410 small_memcpy(to, from, delta);
412 i = len >> 6; /* len/64 */
413 len &= 63;
415 This algorithm is top effective when the code consequently
416 reads and writes blocks which have size of cache line.
417 Size of cache line is processor-dependent.
418 It will, however, be a minimum of 32 bytes on any processors.
419 It would be better to have a number of instructions which
420 perform reading and writing to be multiple to a number of
421 processor's decoders, but it's not always possible.
423 for(; i>0; i--)
425 __asm__ volatile (
426 PREFETCH" 320(%0)\n"
427 "movq (%0), %%mm0\n"
428 "movq 8(%0), %%mm1\n"
429 "movq 16(%0), %%mm2\n"
430 "movq 24(%0), %%mm3\n"
431 "movq 32(%0), %%mm4\n"
432 "movq 40(%0), %%mm5\n"
433 "movq 48(%0), %%mm6\n"
434 "movq 56(%0), %%mm7\n"
435 MOVNTQ" %%mm0, (%1)\n"
436 MOVNTQ" %%mm1, 8(%1)\n"
437 MOVNTQ" %%mm2, 16(%1)\n"
438 MOVNTQ" %%mm3, 24(%1)\n"
439 MOVNTQ" %%mm4, 32(%1)\n"
440 MOVNTQ" %%mm5, 40(%1)\n"
441 MOVNTQ" %%mm6, 48(%1)\n"
442 MOVNTQ" %%mm7, 56(%1)\n"
443 :: "r" (from), "r" (to) : "memory");
444 from=((const unsigned char *)from)+64;
445 to=((unsigned char *)to)+64;
447 #if HAVE_MMX2
448 /* since movntq is weakly-ordered, a "sfence"
449 * is needed to become ordered again. */
450 __asm__ volatile ("sfence":::"memory");
451 #endif
452 /* enables to use FPU */
453 __asm__ volatile (EMMS:::"memory");
456 * Now do the tail of the block
458 if(len) small_memcpy(to, from, len);
459 return retval;