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root |
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#include <stdio.h> |
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#include <assert.h> |
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#include <string.h> |
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#include "lzf.h" |
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typedef unsigned long tval; |
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typedef unsigned long long stamp64; |
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extern inline tval stamp(void) |
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{ |
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tval tsc; |
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asm volatile("rdtsc" : "=a" (tsc) : : "edx"); |
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return tsc; |
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} |
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extern inline tval measure(tval t) |
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{ |
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tval tsc; |
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asm volatile("rdtsc" : "=a" (tsc) : : "edx"); |
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if (tsc>t) |
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return tsc-t; |
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else |
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return t-tsc; |
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} |
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#define DSIZE 1000000 |
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unsigned char data[DSIZE], data2[DSIZE*2], data3[DSIZE*2]; |
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int main(void) |
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{ |
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tval s; |
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tval si[1000]; |
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int i, l, j; |
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int min = 1<<30; |
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FILE *f = fopen ("data", "r"); |
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fread (data, DSIZE, 1, f); |
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fclose (f); |
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for(;;) { |
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s=stamp(); |
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l = lzf_compress (data, DSIZE, data2, DSIZE*2); |
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j = lzf_decompress (data2, l, data3, DSIZE*2); |
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si[0]=measure(s); |
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printf ("\r%10d (%d) ", si[0], l); |
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if (si[0] < min && si[0] > 0) |
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{ |
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printf ("\n"); |
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min = si[0]; |
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} |
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fflush (stdout); |
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assert (memcmp (data, data3, DSIZE) == 0); |
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} |
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return 0; |
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} |
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