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aligned bitstream writer (1% slower on p3 but perhaps its faster on p4?)
Originally committed as revision 296 to svn://svn.ffmpeg.org/ffmpeg/trunk
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commit
4f0f8bfce3
@ -9,6 +9,7 @@
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#endif
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#endif
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//#define ALT_BITSTREAM_WRITER
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//#define ALT_BITSTREAM_WRITER
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//#define ALIGNED_BITSTREAM_WRITER
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//#define ALT_BITSTREAM_READER
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//#define ALT_BITSTREAM_READER
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//#define ALIGNED_BITSTREAM
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//#define ALIGNED_BITSTREAM
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#define FAST_GET_FIRST_VLC
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#define FAST_GET_FIRST_VLC
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@ -238,8 +239,40 @@ static inline uint32_t unaligned32(const void *v) {
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#endif //!ARCH_X86
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#endif //!ARCH_X86
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#ifdef ALT_BITSTREAM_WRITER
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#ifdef ALT_BITSTREAM_WRITER
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static inline void put_bits(PutBitContext *s, int n, int value)
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static inline void put_bits(PutBitContext *s, int n, unsigned int value)
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{
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{
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#ifdef ALIGNED_BITSTREAM_WRITER
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#ifdef ARCH_X86
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asm volatile(
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"movl %0, %%ecx \n\t"
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"xorl %%eax, %%eax \n\t"
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"shrdl %%cl, %1, %%eax \n\t"
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"shrl %%cl, %1 \n\t"
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"movl %0, %%ecx \n\t"
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"shrl $3, %%ecx \n\t"
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"andl $0xFFFFFFFC, %%ecx \n\t"
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"bswapl %1 \n\t"
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"orl %1, (%2, %%ecx) \n\t"
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"bswapl %%eax \n\t"
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"addl %3, %0 \n\t"
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"movl %%eax, 4(%2, %%ecx) \n\t"
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: "=&r" (s->index), "=&r" (value)
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: "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
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: "%eax", "%ecx"
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);
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#else
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int index= s->index;
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uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
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value<<= 32-n;
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ptr[0] |= be2me_32(value>>(index&31));
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ptr[1] = be2me_32(value<<(32-(index&31)));
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//if(n>24) printf("%d %d\n", n, value);
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index+= n;
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s->index= index;
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#endif
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#else //ALIGNED_BITSTREAM_WRITER
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#ifdef ARCH_X86
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#ifdef ARCH_X86
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asm volatile(
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asm volatile(
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"movl $7, %%ecx \n\t"
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"movl $7, %%ecx \n\t"
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@ -267,6 +300,7 @@ static inline void put_bits(PutBitContext *s, int n, int value)
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index+= n;
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index+= n;
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s->index= index;
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s->index= index;
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#endif
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#endif
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#endif //!ALIGNED_BITSTREAM_WRITER
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}
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}
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#endif
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#endif
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