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adding some debug functions to observe statistics

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This commit is contained in:
Yann Collet
2018-05-18 14:09:42 -07:00
parent af3da079d1
commit a95e9e80d1
3 changed files with 53 additions and 26 deletions
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27
lib/compress/zstd_compress_internal.h
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@@ -633,6 +633,33 @@ MEM_STATIC U32 ZSTD_window_update(ZSTD_window_t* window,
return contiguous;
}
/* debug functions */
MEM_STATIC double ZSTD_fWeight(U32 rawStat)
{
U32 const fp_accuracy = 8;
U32 const fp_multiplier = (1 << fp_accuracy);
U32 const stat = rawStat + 1;
U32 const hb = ZSTD_highbit32(stat);
U32 const BWeight = hb * fp_multiplier;
U32 const FWeight = (stat << fp_accuracy) >> hb;
U32 const weight = BWeight + FWeight;
assert(hb + fp_accuracy < 31);
return (double)weight / fp_multiplier;
}
MEM_STATIC void ZSTD_debugTable(const U32* table, U32 max)
{
unsigned u, sum;
for (u=0, sum=0; u<=max; u++) sum += table[u];
DEBUGLOG(2, "total nb elts: %u", sum);
for (u=0; u<=max; u++) {
DEBUGLOG(2, "%2u: %5u (%.2f)",
u, table[u], ZSTD_fWeight(sum) - ZSTD_fWeight(table[u]) );
}
}
#if defined (__cplusplus)
}
#endif