diff options
Diffstat (limited to 'libvo/mmx.h')
| -rw-r--r-- | libvo/mmx.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/libvo/mmx.h b/libvo/mmx.h index bc92a7d5db..30d01b5e2b 100644 --- a/libvo/mmx.h +++ b/libvo/mmx.h @@ -27,6 +27,104 @@ #ifndef _MMX_H #define _MMX_H +/* + This part of code was taken by from Linux-2.4.3 and slightly modified +for MMX2 instruction set. I have done it since linux uses page aligned +blocks but mplayer uses weakly ordered data and original sources can not +speedup their. Only using prefetch and movntq together have effect! +If you have questions please contact with me: Nick Kurshev: nickols_k@mail.ru. +*/ + +#ifndef HAVE_MMX2 +//static inline void * __memcpy(void * to, const void * from, unsigned n) +inline static void * memcpy(void * to, const void * from, unsigned n) +{ +int d0, d1, d2; +__asm__ __volatile__( + "rep ; movsl\n\t" + "testb $2,%b4\n\t" + "je 1f\n\t" + "movsw\n" + "1:\ttestb $1,%b4\n\t" + "je 2f\n\t" + "movsb\n" + "2:" + : "=&c" (d0), "=&D" (d1), "=&S" (d2) + :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from) + : "memory"); +return (to); +} +#else +//inline static void *__memcpy_mmx2(void *to, const void *from, unsigned len) +inline static void * memcpy(void * to, const void * from, unsigned n) +{ + void *p; + int i; + + if(len >= 0x200) /* 512-byte blocks */ + { + p = to; + i = len >> 6; /* len/64 */ + __asm__ __volatile__ ( + "1: prefetch (%0)\n" /* This set is 28 bytes */ + " prefetch 64(%0)\n" + " prefetch 128(%0)\n" + " prefetch 192(%0)\n" + " prefetch 256(%0)\n" + "2: \n" + ".section .fixup, \"ax\"\n" + "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */ + " jmp 2b\n" + ".previous\n" + ".section __ex_table,\"a\"\n" + " .align 4\n" + " .long 1b, 3b\n" + ".previous" + : : "r" (from) ); + + + for(; i>0; i--) + { + __asm__ __volatile__ ( + "1: prefetch 320(%0)\n" + "2: movq (%0), %%mm0\n" + " movq 8(%0), %%mm1\n" + " movq 16(%0), %%mm2\n" + " movq 24(%0), %%mm3\n" + " movntq %%mm0, (%1)\n" + " movntq %%mm1, 8(%1)\n" + " movntq %%mm2, 16(%1)\n" + " movntq %%mm3, 24(%1)\n" + " movq 32(%0), %%mm0\n" + " movq 40(%0), %%mm1\n" + " movq 48(%0), %%mm2\n" + " movq 56(%0), %%mm3\n" + " movntq %%mm0, 32(%1)\n" + " movntq %%mm1, 40(%1)\n" + " movntq %%mm2, 48(%1)\n" + " movntq %%mm3, 56(%1)\n" + ".section .fixup, \"ax\"\n" + "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */ + " jmp 2b\n" + ".previous\n" + ".section __ex_table,\"a\"\n" + " .align 4\n" + " .long 1b, 3b\n" + ".previous" + : : "r" (from), "r" (to) : "memory"); + from+=64; + to+=64; + } + __asm__ __volatile__ ("emms":::"memory"); + } + /* + * Now do the tail of the block + */ + __memcpy(to, from, len&63); + return p; +} +#endif + /* Warning: at this writing, the version of GAS packaged with most Linux distributions does not handle the |