[zstd] Backport kernel patch from @ColinIanKing
* Make the U32 table in `FSE_normalizeCount()` static. * Patch from https://lkml.kernel.org/r/20170922145946.14316-1-colin.king@canonical.com. * Clang makes non-static tables static anyways. gcc however, does [weird things](https://godbolt.org/g/fvTcED). * Benchmarks showed no difference in speed.dev
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@ -582,7 +582,7 @@ size_t FSE_normalizeCount (short* normalizedCounter, unsigned tableLog,
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if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge); /* Unsupported size */
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if (tableLog < FSE_minTableLog(total, maxSymbolValue)) return ERROR(GENERIC); /* Too small tableLog, compression potentially impossible */
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{ U32 const rtbTable[] = { 0, 473195, 504333, 520860, 550000, 700000, 750000, 830000 };
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{ static U32 const rtbTable[] = { 0, 473195, 504333, 520860, 550000, 700000, 750000, 830000 };
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U64 const scale = 62 - tableLog;
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U64 const step = ((U64)1<<62) / total; /* <== here, one division ! */
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U64 const vStep = 1ULL<<(scale-20);
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